Bitcoin Solo 401(k) Estate Planning: The Complete Guide for Self-Employed Holders and Miners

What Is a Solo 401(k)?

A Solo 401(k) — also called an Individual 401(k), Self-Employed 401(k), or i401(k) — is a qualified retirement plan designed specifically for self-employed individuals with no full-time employees other than themselves and their spouse. It is governed by the same rules as a traditional employer-sponsored 401(k), but the plan participant wears two hats simultaneously: they are both the employee making elective deferrals and the employer making profit-sharing contributions.

This dual role is the mechanism that makes the Solo 401(k) so powerful. An ordinary employee can only make employee deferrals (up to $23,500 in 2026). A self-employed person operating a Solo 401(k) makes both the employee deferral and the employer profit-sharing contribution — stacking two types of contributions that can total up to $70,000 per year. That is ten times the IRA contribution limit of $7,000.

The Solo 401(k) is established under a formal plan document — an IRS-approved prototype or individually designed document — adopted by the business. The business is the plan sponsor. The individual is both participant and, in a self-directed plan, the trustee who controls investment decisions. This trustee role is what enables the checkbook control structure that allows direct Bitcoin investment without a custodian intermediary.

For Bitcoin holders, the Solo 401(k) offers three distinct structural advantages over a simple IRA:

• Higher contribution limits: $70,000/year vs. $7,000/year — enabling rapid tax-advantaged Bitcoin accumulation for those with significant self-employment income
• Roth option with no income limit: High-earning self-employed individuals who are phased out of Roth IRA contributions can still designate up to $23,500/year of contributions as Roth — permanently tax-free Bitcoin accumulation at any income level
• Checkbook control: As the plan trustee, you purchase Bitcoin directly from the plan's own checking and brokerage accounts — no per-transaction custodian approval, no per-transaction fees, full investment autonomy within the rules of the plan

The trade-off is complexity. A Solo 401(k) requires a formal plan document, an EIN for the plan itself, plan bank/brokerage accounts, beneficiary designations, and annual filing obligations (Form 5500-EZ once assets exceed $250,000). It also brings ERISA rules governing prohibited transactions that do not apply to IRAs in the same way. The benefits outweigh the administrative burden for most high-income self-employed Bitcoin holders — but it is not a set-and-forget structure. It requires ongoing attention and qualified professional guidance.

Who Qualifies — And Why Bitcoin Miners Are the Ideal Candidate

A Solo 401(k) is available to any self-employed individual or business owner who:

1. Has earned self-employment income (net profit from a Schedule C business, partnership K-1 income with SE tax, or W-2 income from an S-corp in which you own shares), and
2. Has no full-time W-2 employees other than a spouse

Qualifying structures include: sole proprietorships, single-member LLCs taxed as sole proprietorships, multi-member LLCs with no non-owner employees, S-corps with only owner-employees, partnerships with only owner-partners, and independent contractors and consultants of any kind.

Bitcoin miners are among the most ideal Solo 401(k) candidates for three reasons:

1. Mining income is self-employment income at scale. A miner reporting net mining revenue on Schedule C generates the exact type of income that feeds Solo 401(k) contributions. Unlike a W-2 employee capped at the employee deferral, a miner with $300,000 in net mining income can make a $23,500 employee deferral plus a $75,000 employer profit-sharing contribution — and then be limited only by the $70,000 annual cap, not by income insufficiency.

2. Depreciation creates a planning lever. A miner deploying $500,000 in mining hardware can claim bonus depreciation in year one, dramatically reducing net Schedule C income. This reduces AGI immediately — but also reduces the employer profit-sharing contribution room for that year. A sophisticated miner will model the depreciation-versus-contribution trade-off with a CPA each year, deciding how much depreciation to accelerate versus how much contribution room to preserve. The Solo 401(k) is the vehicle that makes this optimization matter.

3. No full-time employees means perpetual eligibility. Most Bitcoin mining operations at the individual or small-family level run without employees — just the owner, possibly a spouse, possibly contractors who are not W-2 employees. This keeps the Solo 401(k) open indefinitely, even as the mining operation scales.

Bitcoin entrepreneurs, developers working on contract, Lightning node operators with service income, and anyone earning freelance or consulting income from the Bitcoin ecosystem are equally strong candidates.

The disqualifying condition: Hiring even one full-time W-2 employee who works 1,000+ hours per year and is not your spouse disqualifies your business from maintaining a Solo 401(k). At that point, you must transition to a SEP-IRA, SIMPLE IRA, or a full 401(k) with a third-party administrator. Planning the business's hiring timeline alongside the retirement plan structure is important.

2026 Contribution Limits: The Math

The Solo 401(k) has two distinct contribution components, each with its own rules, limits, and tax treatment options.

Component 1: Employee Elective Deferral

As the "employee" of your own business, you can defer up to $23,500 of your net self-employment income in 2026 — or 100% of earned income if lower. If you are age 50 or older, the catch-up contribution adds $7,500, for a total of $31,000.

This employee deferral can be designated as:

• Traditional (pre-tax): reduces your current AGI dollar-for-dollar; distributions in retirement are ordinary income
• Roth (after-tax): no current deduction; all future growth and qualified distributions are permanently tax-free
• Any split between the two — you can put $10,000 Roth and $13,500 traditional, for example, based on your current and expected future tax rates

Component 2: Employer Profit-Sharing Contribution

As the "employer," your business can make an additional profit-sharing contribution of up to 25% of your net self-employment income, calculated after the SE tax deduction. For a sole proprietor, the precise formula is: net Schedule C profit × 0.9235 (to deduct the SE tax) × 0.25. The employer contribution is always traditional/pre-tax — Roth employer contributions are not currently permitted in Solo 401(k) plans.

Combined Cap

The sum of employee deferral plus employer profit-sharing cannot exceed $70,000 in 2026 ($77,500 with catch-up). This is the "415 limit" — the IRS annual additions limit per IRC Section 415.

Spousal Participation: Double the Household Limit

If your spouse works in the business — even part-time — they can also participate in the Solo 401(k) and contribute up to the annual limit on their own compensation. For a married couple both active in a Bitcoin mining or consulting business, the household annual limit is theoretically up to $140,000 in combined tax-advantaged Bitcoin accumulation. Few households max this — but those with significant combined self-employment income should model it with a CPA.

Holding Actual Bitcoin in a Solo 401(k)

The standard Solo 401(k) offered by Fidelity, Vanguard, and Schwab does not support alternative assets. To hold actual Bitcoin — not a Bitcoin ETF, not a futures product, but actual on-chain BTC — inside a Solo 401(k), you need a self-directed Solo 401(k) with checkbook control.

How Checkbook Control Works

In a checkbook-controlled Solo 401(k), you are the plan trustee. The plan has its own:

• EIN (Employer Identification Number) — separate from your personal SSN or business EIN
• Bank checking account — in the plan's name (e.g., "John Smith Solo 401(k) Plan Trust"), funded by your contributions
• Brokerage and exchange accounts — opened in the plan's name, used to purchase and hold Bitcoin

As trustee, you sign on all plan accounts and direct transactions. When you want to buy Bitcoin, you log in to the plan's exchange account — not your personal account — and place the order. The Bitcoin is held in accounts owned by the plan trust, not by you personally. You can transfer Bitcoin to a hardware wallet, provided the hardware wallet and its seed phrases are held and documented as plan assets.

Self-Directed Solo 401(k) Providers

Several specialized third-party administrators (TPAs) support self-directed Solo 401(k) plans with alternative assets and Bitcoin:

• Nabers Group — one of the most recognized Solo 401(k) specialists; strong Bitcoin-specific guidance
• Broad Financial — checkbook control structure; IRS opinion letters available
• Rocket Dollar — modern interface, supports a range of alternative assets including crypto
• Alto IRA — initially IRA-focused but has expanded to crypto self-directed accounts

These providers charge setup fees (typically $500–$1,500) and annual maintenance fees ($200–$600/year). The cost is trivial relative to the tax savings on $70,000/year in contributions. Do not attempt to establish a self-directed checkbook-control plan using a form-based brokerage provider — the plan document must explicitly authorize alternative investments and trustee investment discretion.

Bitcoin Custody Inside the Plan: Getting the Details Right

The Bitcoin held inside a Solo 401(k) must be segregated from personal holdings at every level:

• Exchange accounts must be titled to the plan (with the plan's EIN, not your SSN)
• Any hardware wallet holding plan Bitcoin should be documented as a plan asset in writing, with the seed phrase stored in a location separate from personal wallet seeds
• Do not ever send plan Bitcoin to a personal wallet, even temporarily — this is a commingling prohibited transaction
• Maintain a clear record of when Bitcoin was purchased, at what price, and in which account — for plan accounting and potential Form 5500-EZ reporting

The plan owns the Bitcoin. You hold it as trustee in a fiduciary capacity — your role is managing the asset for the plan, not for yourself. This distinction is the entire legal basis of the structure.

The Roth Solo 401(k): Tax-Free Bitcoin Growth With No Income Limit

The Roth Solo 401(k) option is the single most powerful feature for high-income Bitcoin accumulators — and the one most likely to transform generational wealth outcomes.

Here is the core proposition: you contribute after-tax dollars into the Roth portion of your Solo 401(k). Bitcoin purchased with those dollars grows inside the account. When you — or your heirs — eventually take qualified distributions, every dollar is tax-free. One hundred percent. No capital gains. No ordinary income. The IRS has already been paid, at the contribution stage, and the appreciation is permanently exempt from federal income tax.

For Bitcoin, which has historically appreciated at rates far exceeding traditional assets, the value of locking in tax-free treatment on the growth compounds dramatically over time. A $23,500 Roth Solo 401(k) contribution that appreciates 10x inside the account generates $235,000 in tax-free distribution wealth — versus a $161,350 after-tax equivalent if the same distribution were ordinary income at a 37% marginal rate.

The No-Income-Limit Advantage

Roth IRA contributions phase out at $236,000–$246,000 of modified AGI for married filers in 2026. A Bitcoin miner earning $500,000 in net mining income cannot contribute to a Roth IRA directly. They can contribute to a Roth Solo 401(k) — no phaseout, no income limit, full $23,500 (or $31,000 with catch-up) available regardless of income level. This is not a backdoor maneuver. It is an explicit feature of the tax code.

Roth Solo 401(k) vs. Roth IRA: Key Differences

Solving the Roth 401(k) RMD Problem

Starting in 2024 under SECURE Act 2.0, Roth 401(k) accounts are no longer subject to required minimum distributions (RMDs) during the participant's lifetime — matching the Roth IRA treatment. This removes the historical planning step of rolling the Roth Solo 401(k) to a Roth IRA before age 73 to avoid RMDs. However, rolling to a Roth IRA before retirement still simplifies administration — once you reduce or cease self-employment activity, maintaining the Solo 401(k) plan document becomes administrative overhead. Most practitioners recommend rolling the Roth Solo 401(k) balance to a Roth IRA when the business winds down or scales back, preserving all the Roth benefits in a simpler account structure. For heirs, Roth 401(k) distributions are income-tax-free regardless — making the Roth Solo 401(k) an ideal multi-generational transfer vehicle.

For a deep dive on Roth conversion timing and strategy, see our companion guide: Bitcoin Roth IRA Conversion Strategy: Timing, Mechanics, and Tax Efficiency.

The Mining Income + Solo 401(k) Combo: Maximum Tax Efficiency

Bitcoin miners operating as Schedule C sole proprietors or single-member LLCs sit at the intersection of two powerful tax planning tools: accelerated depreciation on mining hardware and the Solo 401(k) contribution deduction. When structured correctly, these two tools work together to dramatically reduce current-year taxable income while simultaneously building a tax-advantaged Bitcoin position inside the retirement plan.

The Base Case: $200K Miner Without a Solo 401(k)

A miner generates $200,000 in net mining income after electricity and hosting costs. With no retirement plan, they face approximately $28,260 in self-employment tax (15.3% on the first $168,600, plus 2.9% on amounts above) plus federal income tax at the 32%+ bracket. After SE tax and federal income tax, the marginal retention rate on that $200,000 is roughly 55–60 cents on the dollar.

The Solo 401(k) Overlay

Adding a Solo 401(k) allows the miner to contribute approximately $69,968 (see the example in Section 3) to the plan. The $46,468 employer profit-sharing contribution is a business deduction that reduces federal taxable income directly. At a 37% marginal rate, that saves $17,193 in federal income tax — plus applicable state income tax savings. The $23,500 Roth employee deferral does not reduce AGI, but locks in tax-free treatment on all future appreciation of that Bitcoin position.

Stacking with a Cash Balance Plan

For miners or entrepreneurs with $400,000+ in net SE income, the Solo 401(k) can be stacked with a cash balance defined benefit plan — a separate pension-type vehicle that can shelter an additional $100,000–$300,000+ per year in pre-tax contributions depending on age. The Solo 401(k) and cash balance plan can coexist for the same business, compounding the tax efficiency dramatically. See our detailed guide on Bitcoin Cash Balance and Defined Benefit Plans for the complete analysis.

A Note on Self-Mined Bitcoin vs. Cash Contributions

You cannot contribute Bitcoin you mined directly to the Solo 401(k) in kind — contributions must be in cash (dollars). However, the process is functionally equivalent: mine Bitcoin, convert to dollars (or use other business cash), contribute cash to the Solo 401(k), then use the plan's checkbook control to purchase Bitcoin on an exchange account titled to the plan. The result is Bitcoin inside the Solo 401(k) — just arrived via cash intermediation rather than direct in-kind contribution.

Estate Planning: Beneficiary Rules, ERISA Spousal Protections, and the 10-Year Rule

A Solo 401(k) is fundamentally different from personal Bitcoin held in a wallet or a taxable brokerage account when it comes to estate transfer. Understanding these differences is not optional — getting them wrong can cost heirs hundreds of thousands of dollars in unnecessary taxes or result in court-ordered distributions that override your intent.

Beneficiary Designation Controls — Not Your Will or Trust

The single most important estate planning principle for a Solo 401(k): the plan passes to whoever is named on the beneficiary designation form, not to whoever is named in your will or revocable living trust. If you named your ex-spouse as beneficiary five years ago and never updated the form, your ex-spouse inherits the account regardless of what your will says. If you named your oldest child but forgot the form after having two more children, only the oldest child receives the account.

Beneficiary designations must be:

• Completed at plan inception — do not defer this step
• Updated after any major life event: marriage, divorce, birth of a child, death of a named beneficiary
• Coordinated with your broader estate plan so that your attorney and estate planner are aware of who is named
• Stored in a location your executor can find — often a fireproof safe or a digital estate file

For a broader treatment of Bitcoin estate planning mechanics, see our foundational guide: The Complete Bitcoin Estate Planning Guide.

ERISA Spousal Protection: Your Spouse Has Special Rights

ERISA — the Employee Retirement Income Security Act — provides your spouse with mandatory rights in a qualified retirement plan. Specifically: if you are married, your spouse is automatically the primary beneficiary of your Solo 401(k) unless they execute a written, notarized waiver consenting to a different named beneficiary. You cannot simply name your children as primary beneficiaries without your spouse's written consent.

This ERISA spousal protection is a critical planning consideration that does not exist for IRAs. If you want your children, a trust, or any non-spouse entity to receive your Solo 401(k) at death, your spouse must sign a Qualified Preretirement Survivor Annuity (QPSA) waiver — a formal, witnessed consent document. Work with your plan administrator and an ERISA attorney to ensure this is properly executed if your estate plan calls for non-spouse primary beneficiaries.

The Surviving Spouse Rollover: The Best Outcome

A surviving spouse who inherits a Solo 401(k) has the best possible outcome available to any beneficiary: they can roll the entire inherited balance into their own IRA — traditional or Roth — and treat it as their own retirement account. No 10-year forced withdrawal. No immediate income tax. The Bitcoin continues compounding inside the IRA on the surviving spouse's timeline.

For a Roth Solo 401(k): the surviving spouse rolls to a Roth IRA — no RMDs during their lifetime, all future distributions permanently tax-free. A Bitcoin position that has appreciated significantly inside the Roth 401(k) transfers to the surviving spouse as a Roth IRA with zero income tax due — ever — provided qualified distribution rules are met. This is among the most tax-efficient wealth transfer mechanisms available under current law.

Non-Spouse Beneficiaries: The SECURE Act 10-Year Rule

Non-spouse beneficiaries — adult children, grandchildren, siblings, friends — must withdraw the entire inherited Solo 401(k) balance within 10 years of the plan participant's death. This is the SECURE Act 10-year rule, enacted in 2019 and extended by SECURE Act 2.0 in 2022.

Key mechanics of the 10-year rule:

• There are no mandatory annual distributions within the 10-year window — the beneficiary can take all the money in year 1, spread it evenly, take nothing for 9 years and everything in year 10, or any other pattern
• The account must be fully distributed by December 31 of the 10th year following the year of the participant's death
• For traditional (pre-tax) Solo 401(k) assets, every dollar distributed is ordinary income to the beneficiary in the year taken — not capital gains, not partially tax-free, but fully ordinary income taxed at the beneficiary's marginal rate
• For Roth Solo 401(k) assets, every dollar distributed is income-tax-free

Exceptions (Eligible Designated Beneficiaries who can use the lifetime stretch):

• Surviving spouse
• Minor child of the deceased (only until they reach age of majority — then the 10-year rule kicks in)
• Disabled individual (as defined by IRC Section 72(m)(7))
• Chronically ill individual
• Individual not more than 10 years younger than the deceased

For most families leaving a Solo 401(k) to adult children, the 10-year rule applies. A large traditional Solo 401(k) inherited by a child at age 45 who earns $200,000/year of their own income could create a devastating additional tax burden — 10 years of forced ordinary income recognition at top marginal rates. The mitigation strategy is Roth conversion during the participant's lifetime.

Naming a Trust as Beneficiary of Your Solo 401(k)

Naming a trust as the beneficiary of a Solo 401(k) is legally permissible but requires careful execution. The common reasons to name a trust include: protecting a minor child beneficiary until they reach adulthood, adding spendthrift protections for an heir who cannot be trusted with a large lump sum, applying an incentive distribution structure, or asset protection from a beneficiary's creditors or divorce.

See-Through (Look-Through) Trust Requirements

For a trust to qualify for the 10-year rule (rather than the less favorable 5-year rule or immediate distribution), the trust must meet the IRS "see-through" or "look-through" requirements under Treasury Regulation 1.401(a)(9)-4:

1. The trust must be a valid trust under state law
2. The trust must be irrevocable (or become irrevocable) at the participant's death
3. The trust beneficiaries must be identifiable individuals — not a charity or entity as the sole beneficiary
4. Trust documentation must be provided to the plan administrator by October 31 of the year following the participant's death

Conduit vs. Accumulation Trusts

There are two qualifying see-through trust structures:

Conduit trust: All required minimum distributions (or, post-SECURE Act, all distributions from the inherited account during the 10-year window) pass through the trust directly to the individual beneficiaries. The trust cannot retain assets — distributions come out of the inherited 401(k) and flow through to the individual. The individual beneficiary pays income tax. Simpler to draft and easier to comply with see-through requirements.

Accumulation trust: The trust can retain distributions rather than passing them through to individual beneficiaries immediately. Assets can accumulate inside the trust. This provides greater asset protection and control — but the trust may pay income tax at compressed trust tax brackets (the top rate of 37% kicks in at just $15,650 of trust income in 2026), which can be costly for large inherited account balances. Requires more sophisticated drafting and planning.

The decision between conduit and accumulation trust depends on the specific goals — asset protection versus tax efficiency. Work with an ERISA attorney and estate planning attorney in tandem when drafting a trust intended to receive 401(k) assets. A generic revocable trust is typically insufficient and will not satisfy see-through requirements without modification.

No Step-Up in Basis: The Income in Respect of a Decedent Problem

One of the most important — and most misunderstood — estate planning differences between a Solo 401(k) and directly held Bitcoin is the treatment of basis at death.

When you die holding Bitcoin directly (outside any retirement account), your heirs receive a step-up in cost basis to the fair market value on the date of death. A child inheriting 1 BTC worth $200,000 that you bought for $5,000 owes no capital gains tax on the $195,000 appreciation — their basis is reset to $200,000 at inheritance.

When you die holding Bitcoin inside a Solo 401(k), there is no step-up in basis. The retirement account assets are classified as Income in Respect of a Decedent (IRD) under IRC Section 691. Every dollar distributed from a traditional Solo 401(k) — whether by you during life or by your heirs after death — is ordinary income, taxed at the heir's marginal rate. The $195,000 appreciation does not escape taxation. It gets taxed when distributed, at ordinary income rates, not capital gains rates.

The estate tax deduction (IRC Section 691(c)) partially offsets this — heirs can deduct the estate tax attributable to the IRD items. But for most estates below the federal estate tax exemption (currently $13.99 million per person), this deduction is unavailable because no estate tax was paid.

The practical implication: for Bitcoiners building generational wealth, directly held Bitcoin that passes through your estate receives a step-up in basis — your heirs owe zero capital gains tax on all appreciation during your lifetime. Bitcoin held inside a traditional 401(k) does not receive this treatment — every dollar is ordinary income to heirs.

This asymmetry is why Roth conversion is the most powerful estate planning move for traditional 401(k) holders: converting to Roth eliminates the ordinary income problem for heirs while you pay the conversion tax (hopefully at rates lower than your heirs would face). Our Bitcoin Roth IRA Conversion Strategy guide covers the mechanics and timing in detail.

Prohibited Transaction Rules for Bitcoin Solo 401(k) Holders

The IRS prohibited transaction rules under IRC Section 4975 are the most dangerous compliance area for self-directed Solo 401(k) holders. A prohibited transaction triggers immediate disqualification of the entire plan — all assets become taxable in the year of disqualification, plus potential excise tax penalties. There is no curative exception. The consequences are severe.

The rules prohibit transactions between the plan and "disqualified persons," which includes:

• You (the plan participant and trustee)
• Your spouse
• Your children, grandchildren, and their spouses
• Your parents and grandparents
• Any entity (corporation, LLC, partnership, trust) in which you own 50%+ or that you control as a fiduciary
• Your business partners or officers with 10%+ ownership in a plan-related entity

For Bitcoin-specific prohibited transactions, the most important rules to know:

• ❌ Selling Bitcoin you personally own to the plan — even at fair market value, even via a documented arm's-length transaction. The transaction itself is prohibited, not just the price
• ❌ Using plan Bitcoin as collateral for a personal loan — you cannot pledge plan-held BTC to secure a margin loan or personal credit line, even if you intend to repay it
• ❌ Personally using a hardware wallet or exchange account that holds plan Bitcoin — no commingling of plan and personal wallets at any level
• ❌ Paying yourself advisory fees for managing the plan's Bitcoin investments — reasonable trustee compensation may be permitted under some plan documents, but self-dealing fees for "investment management" are not
• ❌ Contributing Bitcoin in-kind — contributions must be cash; the plan then purchases Bitcoin independently
• ❌ Buying or selling Bitcoin between the plan and a business you control — even if the business is a different legal entity

The Solo 401(k)'s checkbook control is a feature — but it also means there is no custodian acting as a gatekeeper to catch prohibited transactions before they happen. The compliance obligation rests entirely on you as the plan trustee. When in doubt on any non-standard transaction, obtain a written opinion from a qualified ERISA attorney before proceeding. The cost of an attorney opinion letter ($500–$2,000) is infinitesimal compared to the cost of an inadvertent plan disqualification.

Plan Termination at Death: What Happens and What Your Executor Must Do

When a Solo 401(k) participant dies, the plan does not automatically dissolve. It continues to exist as a legal entity until all assets are distributed. The executor of the estate and the beneficiaries must take deliberate steps to wind down the plan properly — and for a plan holding Bitcoin with checkbook control, the logistics of securing the plan's digital assets are as important as the legal procedures.

Immediate Priorities

1. Secure plan-held Bitcoin. If the plan holds Bitcoin on hardware wallets or on exchange accounts, the executor must locate and secure these assets immediately. This requires knowing where the plan's hardware wallets are stored and having access to the plan's exchange account credentials. This is why a comprehensive Digital Estate Memorandum — kept in a secure but accessible location — is essential. The executor needs: (a) the list of exchange accounts in the plan's name, (b) the login credentials, (c) the location of hardware wallets titled to the plan, and (d) the seed phrases or recovery methods.

2. Locate and review beneficiary designations. The executor must obtain the plan's beneficiary designation forms to identify who is entitled to the plan assets. These forms control distribution — not the will.

3. Notify beneficiaries and initiate transfers. For a surviving spouse: notify them of the spousal rollover right and the 60-day election window. For non-spouse beneficiaries: initiate the transfer to an inherited IRA within the plan's documented timeframes.

Rolling to an Inherited IRA

Non-spouse beneficiaries cannot roll an inherited Solo 401(k) into their own IRA — they must transfer it to an "Inherited IRA" (also called a Beneficiary IRA) in their name as beneficiary. The inherited IRA must be properly titled: "John Smith, deceased, FBO [Beneficiary Name], Beneficiary IRA." The 10-year rule runs from the date of the original participant's death.

For a plan holding Bitcoin, the inherited IRA must be at a custodian that supports Bitcoin — a specialized crypto IRA custodian. The Bitcoin cannot remain in the Solo 401(k) plan indefinitely; it must be transferred to an account the beneficiary controls within the beneficiary IRA structure. This transfer should be planned in advance — ideally the participant has already identified a Bitcoin-capable inherited IRA custodian that beneficiaries can use.

Executor's Formal Obligations

1. File a final Form 5500-EZ for the plan year in which the participant died (if required)
2. Ensure all distributions from the plan to beneficiaries are properly documented and reported on Form 1099-R
3. Formally terminate the plan once all assets are distributed — file a final Form 5500-EZ marked as the final return
4. Close plan bank accounts and exchange accounts once empty

The executor who does not understand the Solo 401(k) structure may inadvertently make decisions that create deemed taxable distributions or miss mandatory rollover election windows. This is why including explicit instructions for your Solo 401(k) — not just for your personal Bitcoin — in your estate documents is essential.

Solo 401(k) vs. IRA for Bitcoin Estate Planning: A Direct Comparison

Both the Solo 401(k) and the IRA can hold actual Bitcoin through self-directed structures, and both involve beneficiary-controlled inheritance rather than will-based distribution. But they differ meaningfully in the details that matter for estate planning.

The summary conclusion: the Solo 401(k) is superior for accumulation — higher limits, Roth option at any income, loan access. The IRA is simpler for administration and estate transfer. For many Bitcoin holders, the optimal strategy is to max the Solo 401(k) first, then use a self-directed Roth IRA for the remaining $7,000 contribution room. At retirement or wind-down of the business, roll the Roth Solo 401(k) balance to a Roth IRA to consolidate and simplify the estate structure.

The Solo 401(k) + Dynasty Trust Bifurcated Structure

The most sophisticated Bitcoin estate planning architecture for high-net-worth self-employed individuals is a bifurcated structure that uses two vehicles for two distinct purposes:

1. The Solo 401(k) — for current income sheltering and annual tax-advantaged accumulation during the working years
2. A dynasty trust — for multi-generational transfer of directly held Bitcoin outside the retirement plan

Why Bifurcate?

Retirement accounts are powerful for accumulation during your lifetime — but they are problematic for multi-generational transfer because of the SECURE Act 10-year rule and the lack of step-up in basis. A dynasty trust holding directly owned Bitcoin has none of these problems: it can hold Bitcoin for 100+ years (in many states), distributions are controlled by trust terms rather than forced withdrawal windows, and the Bitcoin transferred into the trust at inception (or via gift) may qualify for gift tax annual exclusions or the lifetime exemption.

The bifurcated strategy works as follows:

• Solo 401(k) handles the income tax problem during your lifetime — you contribute $70,000/year in pre-tax or Roth dollars, reducing current taxable income and building tax-advantaged retirement wealth
• Directly held Bitcoin (outside the 401(k)) funds the dynasty trust — Bitcoin purchased from after-tax income, or Bitcoin received as mining rewards before conversion to the 401(k) contribution cycle, is gifted or sold to the dynasty trust using annual gift exclusions ($18,000/person in 2026) and lifetime exemption amounts
• The dynasty trust holds Bitcoin for multiple generations — no 10-year forced withdrawal, no ordinary income problem (Bitcoin's basis in the trust is established at gifting), and trust asset protection from beneficiary creditors and divorce

How the Two Structures Complement Each Other

The Solo 401(k) creates a tax shelter for income that must be recognized now — reducing the tax cost of mining or consulting income. The dynasty trust creates a tax shelter for wealth that can be transferred now via the gift tax system, before Bitcoin appreciates further. Together, they address two different wealth transfer problems:

The 401(k) solves the "I'm earning a lot of income and paying too much tax today" problem. The dynasty trust solves the "I want my Bitcoin to compound for 100 years without being forced out every 10 years into my grandchildren's taxable income" problem. Neither vehicle alone does both jobs. The bifurcated structure is how the most sophisticated Bitcoin families address both simultaneously.

This is not a simple structure to establish or maintain. It requires coordination between a CPA (for the 401(k) contribution optimization), an estate planning attorney (for the dynasty trust drafting and gifting strategy), and ideally a Bitcoin-savvy advisor who understands how these tools interact. But for a self-employed Bitcoin miner generating $200,000–$1,000,000 in annual mining income and accumulating significant Bitcoin wealth, the bifurcated structure is the architecture most likely to maximize both current-year tax efficiency and multi-generational wealth transfer.

Setting Up a Bitcoin Solo 401(k): Step-by-Step

1. Confirm eligibility: Verify you have net self-employment income (Schedule C, K-1 with SE tax, or S-corp W-2 with ownership) and no full-time non-spouse W-2 employees
2. Choose a self-directed TPA: Select Nabers Group, Broad Financial, Rocket Dollar, or similar — a provider that explicitly supports alternative assets and checkbook control. Confirm they provide an IRS-approved plan document that allows Bitcoin and other alternative investments
3. Adopt the plan document: Sign the plan adoption agreement as both the employer and the plan trustee. The agreement specifies: Roth option, loan provision, investment authority, and who may serve as trustee
4. Obtain an EIN for the plan: Apply for a separate EIN for the plan trust at IRS.gov — this takes 5–10 minutes online
5. Open plan accounts: Open a business checking account at a bank in the plan's name and EIN. Open exchange accounts (Coinbase, Kraken, etc.) in the plan's name and EIN for Bitcoin purchases
6. Fund the plan: Make your employee deferral contribution by check or ACH from your business account to the plan's checking account, following the plan document's timing rules. Make the employer profit-sharing contribution by the business's tax filing deadline (including extensions)
7. Purchase Bitcoin: Using the plan's exchange account, purchase Bitcoin. Transfer to a hardware wallet titled to the plan if desired — document the wallet as a plan asset
8. Complete beneficiary designations: File the beneficiary designation form with the plan administrator immediately. Update after any major life event. If naming a non-spouse primary beneficiary, obtain the notarized spousal consent (QPSA waiver)
9. Annual compliance: File Form 5500-EZ with the IRS each year once plan assets exceed $250,000. Keep plan account statements. Maintain the plan document in a secure location your executor can access
10. Create a Digital Estate Memorandum: Document all plan account locations, exchange account credentials, hardware wallet locations, and recovery information — stored securely but accessible to your executor and beneficiaries

Frequently Asked Questions