Using a Self-Directed IRA or Solo 401(k) to Fund Deals

Most investors miss an equity pool that is already theirs: their own retirement account. The standard IRA — the one your broker sold you — is a walled garden. Stocks, bonds, mutual funds, maybe a REIT if you push. But a Self-Directed IRA and a Solo 401(k) remove the wall. They let you point retirement dollars at the same assets you are chasing with after-tax cash: rental houses, promissory notes secured by real estate, syndication LP interests, and tax-lien certificates.

That pool is massive. US households hold over $35 trillion in retirement accounts, and while most of it sits in 401(k) plans locked to employer menus, rollover IRAs and Solo 401(k)s — accounts you control — represent hundreds of billions. A portion of that is already flowing into private real estate debt and equity, and the infrastructure to do it has matured.

This article covers how the accounts work, what they can buy, the compliance tripwires that will blow one up (prohibited transactions and UBIT), and a worked example of retirement capital in a real deal.

What a Self-Directed IRA Actually Is

A Self-Directed IRA (SDIRA) is an IRA — traditional or Roth — that a specialized custodian opens for alternative assets. The tax wrapper is identical to a conventional IRA. The difference is the menu: instead of a brokerage platform offering listed securities, you direct the custodian to buy a specific house, fund a specific note, or acquire an LLC membership interest. You, not a wirehouse advisor, decide what the IRA owns.

The two main structures:

1. Custodian-held SDIRA. The custodian holds title, receives rent checks, pays the property tax bill, and cuts reimbursements to contractors. You make the decisions; the custodian executes the paperwork. Fees are higher ($300–$2,000/year depending on asset type and transaction count) because every action requires a human to process it.

2. Checkbook IRA (IRA-owned LLC). Your IRA invests in a newly formed LLC, which you manage as its non-compensated manager. The LLC opens a bank account. You write checks directly from the LLC for purchase, repairs, insurance, and you deposit rent checks into the LLC account. No custodian approval per transaction. This eliminates the fee-per-action model and the 2–4 week delay of custodian processing — critical when you are bidding against cash buyers. The tradeoff is more up-front legal work (LLC formation and operating agreement, roughly $1,500–$2,500 in attorney fees) and absolute compliance with the no-self-dealing rules.

Solo 401(k): The Higher-Limit Alternative

If you have self-employment income — a side business, consulting, a 1099 gig — a Solo 401(k) offers three advantages over an SDIRA:

1. Contribution limits are far higher. You contribute as both the employee (an elective deferral in the low-to-mid $20,000s, plus a catch-up if you’re 50+) and the employer (a profit-sharing contribution of up to 25% of compensation), for a combined cap in the low-$70,000s — versus roughly $7,000 in a traditional IRA. These figures are inflation-indexed and rise most years, so confirm the current-year limits with the IRS before you contribute. A spouse on payroll can contribute separately, doubling the household total.

2. No custodian required for many plans. You serve as the trustee. You open a brokerage or bank account in the plan’s name and invest directly — functionally similar to a checkbook IRA but with fewer middlemen. Some providers (MySolo401k.net, Rocket Dollar, Nabers Group) specialize in “self-directed Solo 401(k)” plans with the plan documents pre-drafted and IRS-compliant.

3. UBIT exemption for leveraged real estate. This is the biggest structural advantage. An IRA that borrows money (a non-recourse mortgage on a rental property) triggers UBIT on the debt-financed portion of the income. A Solo 401(k) is exempt from UBIT on leveraged real estate. If your strategy involves financing properties inside the retirement wrapper, a Solo 401(k) preserves more of the tax advantage.

The eligibility bar: you must have self-employment income, and you cannot have full-time employees (other than your spouse). If you meet that bar, the Solo 401(k) dominates a traditional SDIRA on almost every dimension.

Choosing a Custodian or Provider

The custodian is the gatekeeper. Pick one that permits the specific asset class you intend to buy — not all custodians allow all assets — and that charges a fee structure aligned with your deal volume.

Major SDIRA custodians active in real estate and private lending:

• Equity Trust — largest in the space; handles real estate, notes, private placements, and tax liens. Fee schedule is transaction-based.
• uDirect IRA — smaller, founder-led, strong on real estate and checkbook IRA setup.
• Advanta IRA — flat-fee model for some asset types; good for buy-and-hold rental investors with low transaction volume.
• Midland IRA — regional but handles private lending and real estate well.

Solo 401(k) plan providers (documents + trust setup):

• MySolo401k.net — plan documents, trust setup, and ongoing compliance support.
• Rocket Dollar — combines plan documents with a partnered brokerage.
• Nabers Group — plan-only provider with an educational bent.

Ask every custodian or provider three questions before opening:

1. “Show me the all-in annual fee for one rental property held long-term.” (This is your baseline.)
2. “What is your turnaround time for a cash purchase — from my written direction to cleared funds?” (Anything over two weeks is a problem.)
3. “Do you permit an IRA-owned LLC — a checkbook IRA — and what is the setup cost?”

What a Retirement Account Can Buy

The IRS does not publish a list of approved assets. It publishes a list of prohibited ones (collectibles, life insurance, S-corporation stock). Everything else is permitted unless it triggers a prohibited transaction. Practically, the four asset classes most relevant to real estate investors and acquisition entrepreneurs are:

1. Direct real estate. Single-family rentals, small multifamily, commercial buildings, vacant land. The account buys the property, holds title, collects rent, pays expenses. All appreciation and cashflow compound tax-deferred inside the wrapper.

2. Promissory notes and private lending. Your IRA becomes a private money lender: it issues a promissory note to a borrower (another investor, a business buyer, a rehabber) secured by a mortgage or deed of trust. The borrower makes monthly payments to the IRA. The interest — 8 to 12% on most private-money deals — flows back to the account tax-deferred. Your IRA is the bank; the spread is yours.

3. Syndication LP interests. Your IRA can invest as a limited partner in a real estate syndication or a private fund. The syndicator sends K-1s and distributions to the IRA. The complication: if the syndication uses debt, the IRA may receive a K-1 reporting UBTI. More on that below.

4. Tax-lien and tax-deed certificates. The IRA buys a tax-lien certificate at auction; the property owner must repay with statutory interest (often 12–36% annually depending on the state). If the owner does not redeem, the IRA may eventually acquire title to the property. This asset class requires a custodian that understands tax liens — not all do.

UBIT / UDFI: The Tax on Leveraged Property

UBIT (Unrelated Business Income Tax) and its subcategory UDFI (Unrelated Debt-Financed Income) apply when a tax-exempt entity — including an IRA — earns income from a business activity not substantially related to its exempt purpose, or from property acquired with debt.

The rule that matters for IRA-owned real estate: if the IRA borrows money to buy a property — a non-recourse mortgage — the portion of income attributable to the debt is subject to UBIT at trust tax rates.

How the math works:

• IRA buys a $200,000 rental with $100,000 of IRA cash and a $100,000 non-recourse mortgage.
• The debt-financed percentage is 50% (the $100k loan divided by the $200k purchase).
• 50% of the rental profit is subject to UBIT each year.
• The IRA must file Form 990-T and pay the tax.

For a property generating $8,000 of net rental income annually, the UBIT piece is roughly $4,000 × trust tax rates (up to 37% at the top bracket) — so roughly $1,000–$1,500 in tax per year. That may still be worth paying for the leverage, but it must be modeled.

The rule of thumb: if the IRA will own leveraged property, talk to a CPA before you close. UBIT filing is not DIY territory. The Form 990-T, the depreciation recapture calculation, and the state-level equivalents are complex enough that the cost of professional prep is less than the cost of getting it wrong.

Partnering Your IRA with Other Capital

An IRA does not have to fund a deal alone. Partnering retirement capital with personal funds, with another investor’s IRA, or with conventional debt is legal — as long as the partnership is structured before the deal and no money crosses between the IRA and a disqualified person.

Common structures:

• IRA + personal LLC. The IRA owns a membership interest alongside you personally. The split reflects each party’s capital contribution. The IRA’s share of profit and appreciation returns to the IRA; your share goes to you. This lets you pool retirement money with after-tax cash without commingling or triggering a prohibited transaction.

• Two IRAs investing together. Two unrelated investors — not spouses, not parents and children — each direct their IRA to buy fractional interests in the same property. Each IRA receives its proportional share of income and bears its proportional share of expenses. This is how groups of SDIRA holders self-syndicate a deal without forming a fund.

• IRA equity + conventional debt (non-recourse, in the IRA’s name). The IRA puts down 40–50% in cash and borrows the rest from a non-recourse lender. The lender’s recourse is limited to the property — it cannot pursue the IRA owner personally. Non-recourse IRA lenders include First Western Federal Savings Bank (specializes in SDIRA lending), North American Savings Bank, and certain community banks and credit unions that offer IRA-specific loan products. Rates are typically 1–3% above conventional rates, and minimum LTV requirements are higher (50% down is common). Expect to pay a rate premium for the non-recourse structure.

Worked Example: Private Note Inside an SDIRA

The cleanest SDIRA deal type — and the one with the fewest compliance headaches — is a promissory note secured by real estate. No property tax bill to pay, no toilet to fix, no UBIT because there is no debt inside the IRA. Your IRA acts as a private lender.

The beauty of the private-note structure inside an SDIRA is that it generates tax-advantaged passive yield without the operational complexity of owning real estate. You are earning what a hard money lender earns — 10% — but inside a tax wrapper, with no property management.

How to Get Started This Quarter

The infrastructure exists. The compliance rules are well-understood. The bottleneck is not paperwork — it is finding a deal, selecting the right structure for it, and executing without stepping on a 4975 landmine.

Step-by-step, 90-day path:

1. Week 1–2: Decide which account fits. If you have self-employment income and no employees, open a Solo 401(k). If you have a rollover IRA from an old employer, open a checkbook SDIRA. If you have both, start with the Solo 401(k) — the UBIT exemption alone is worth the setup cost.

2. Week 2–3: Engage the provider. Call 2–3 custodians or providers. Get a fee schedule in writing. Confirm they handle the asset class you intend to buy. If doing a checkbook IRA, retain a qualified attorney (not a generalist) to draft the LLC operating agreement — the language matters for 4975 compliance.

3. Week 3–5: Fund the account. Roll over an old 401(k) or transfer an existing IRA. Custodian-to-custodian transfers preserve the tax treatment. Do not take a distribution yourself — do a direct trustee-to-trustee transfer. If you write yourself a check, you have 60 days to redeposit it into the new account, and if you miss the window, it is a taxable distribution.

4. Week 4–8: Source a deal. The note structure above — lending to a rehabber at 10% — is the lowest-risk entry. Attend REIA meetings, connect with wholesalers, let it be known that you have dry powder for private lending. Alternatively, scan tax-lien auctions if your custodian supports them. A rental property is fine but adds property management and custodian coordination overhead that slows everything down.

5. Week 6–10: Direct the investment. Send a written direction letter to the custodian (or, for a checkbook IRA, wire funds from the LLC account). The direction letter specifies: the asset, the purchase price, the closing date, and the title entity (which will be the IRA, or the IRA’s LLC). Sign nothing personally except as a manager of the IRA-owned LLC. All documents — the deed, the promissory note, the mortgage — must name the IRA or the IRA-owned LLC as the buyer or lender, not you.

6. Month 3 and ongoing: File Form 990-T if the IRA owns leveraged property or receives UBTI from a syndication. Keep all receipts, all rent deposits, and all expense payments flowing through the IRA or the IRA-owned LLC’s bank account — never through your personal account.

Frequently Asked Questions

Can I use my SDIRA to buy a property and live in it?

No. Any personal use — even one night — is a prohibited transaction. The IRA owns the asset for investment purposes. You and your disqualified persons cannot benefit from it before distribution age.

What happens if I make a mistake on a prohibited transaction?

The IRA is disqualified. The entire account balance is treated as distributed on January 1 of the year the transaction occurred. All deferred tax becomes due immediately, plus a 10% early-distribution penalty if you are under 59½. This is catastrophic and the IRS does not offer a “fix it later” program for 4975 violations.

Can my IRA partner with my personal LLC on the same deal?

Yes, as long as the partnership is structured before the deal and no money crosses between you and the IRA. Both parties fund their pro-rata share at close. Profit is distributed proportionally. The IRA’s share stays in the IRA; your share stays with you. Do not structure it as the IRA lending money to your LLC — that is a prohibited transaction.

Can I retire early off SDIRA income?

No. Income generated inside an IRA cannot be distributed to you before age 59½ without incurring a 10% early-distribution penalty (in addition to ordinary income tax on the withdrawal). The IRA owns the asset and collects the cashflow. You can access the money only by taking a qualified distribution — penalty-free starting at 59½, with required minimum distributions beginning at the RMD age (73 under current law, rising to 75 in 2033). For early financial independence, generate income from assets you own personally, not from assets inside the IRA.

Can I use an SDIRA to fund a business acquisition?

The IRA can buy an equity interest in a business — but the IRA cannot be the operating entity, and you cannot take a salary from it. If you are the operator, you are a disqualified person and cannot receive compensation from an IRA-owned business. The most practical SDIRA business play is a passive equity stake or a note to the acquiring entity, not an active operating role.

Is the checkbook IRA a legal gray area?

No. The IRS has acknowledged IRA-owned LLCs — commonly called checkbook IRAs — in guidance and private letter rulings. The structure is valid as long as the LLC is managed in compliance with 4975. The Checkbook IRA is an administrative convenience, not a compliance loophole.

Can I pool multiple people’s SDIRA funds into one deal?

Yes. This is increasingly common in private syndications: the sponsor admits 5–10 SDIRA investors as limited partners. Each IRA owns its proportional interest. The critical requirement: no one IRA can control the investment in a way that benefits its owner personally. The syndicator must be an unrelated third party, not one of the IRA owners.

For more on how retirement capital fits into the broader financing picture, see the capital stack and private money lenders. For deal structures that pair retirement equity with creative debt, see no money down strategies.

This guide is educational and is not financial, tax, legal, or investment advice. Programs, lender policies, and tax rules change. Consult a licensed attorney, CPA, and lender before acting.