Can You Buy Real Estate With a Solo 401(k)? The Short Answer Is Yes, With Rules

Guides · Updated October 2026

Can you buy real estate with a solo 401(k)? Yes. The IRS lets your plan hold rental houses, commercial buildings, raw land, tax liens, private notes, even pieces of syndications. All the rent flows back into the plan, tax-deferred, and the sale proceeds stay in the plan too. On paper it is the best of both worlds: bricks and mortar compounding inside a retirement account.

But the rule set around it is the tightest in the solo 401(k) universe, and I have watched the pattern repeat. Someone with $180,000 sitting in a brokerage solo 401(k) buys a rental house in cash. The $1,150 monthly rent flows back into the plan. That part is clean. The trouble starts with the small stuff: they drive over on Saturday and snake the drain themselves. Free work for the plan sounds harmless. The IRS does not agree.

The principle is total separation. Money moves one way, into the plan, and benefits move the other way only at retirement. You cannot live in the property, not even for a weekend, and paying the plan fair rent for the stay does not fix it. You cannot buy the property from yourself, from your parents, your kids, or a company you control; those are disqualified persons under IRC section 4975, and a deal with any of them is a prohibited transaction. One prohibited transaction can disqualify the whole plan, which means the full balance becomes taxable income that year. That is the hammer behind every rule below.

Repairs and management sit in the same bucket. You cannot act as the leasing agent, the property manager, or the handyman, paid or unpaid. Your spouse's contracting business cannot bill the plan. Everything, from the insurance premium to the new water heater, gets paid from the plan's bank account, and every dollar of rent lands in that same account. No personal account touches plan money, ever. Commingling is a slow way to create a fast disaster.

The setup step people skip: not every solo 401(k) provider allows alternative investments. Most mainstream brokerages restrict you to stocks, funds, and ETFs. Buying property requires a self-directed plan document with checkbook control, which means a dedicated plan checking account that signs the purchase. If your current provider will not hold real estate, you need a new plan document before you shop for houses, not after.

Can you buy real estate with a solo 401(k) when you need a mortgage?

Financing is where the math gets interesting. A solo 401(k) can only take non-recourse loans, no personal guarantee, no co-signing, because you cannot pledge yourself as credit support for the plan. When the property carries debt, the IRS treats the financed share of the income as unrelated business income. If half the property is debt-financed, about half the rental income and half the gain at sale face UBIT, reported on Form 990-T. That is the rough rule.

Say the plan puts $100,000 down on a $200,000 rental and borrows the other $100,000 on a non-recourse note. Gross rents of $18,000 a year produce roughly $9,000 of debt-financed income subject to UBIT, taxed at trust rates. The debt share shrinks each year as the mortgage amortizes, so the tax bill fades over the loan's life, and it vanishes when the note is paid off. Bought entirely with plan cash, the same property generates zero UBIT. That is why most experienced buyers either pay cash or over-borrow deliberately, take the UBIT hit early, and refinance into amortization.

My honest read: if your plan holds under $100,000, the property play is usually not worth the overhead. The third-party management, the separate accounting, the Form 5500-EZ once assets cross $250,000, and the compliance anxiety eat the return on one modest rental. At plan balances of $200,000 and up, with cash purchases, it starts to look sensible. Real estate inside a solo 401(k) is a strategy for large balances and patient owners, not a shortcut for small ones.

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Frequently asked questions

Can you buy real estate with a solo 401(k)?

Yes. The IRS permits solo 401(k) plans to hold residential rentals, commercial property, raw land, tax liens, private notes, and real estate syndications, provided the plan document allows alternative investments. Personal use and deals with disqualified persons are prohibited.

Can I live in a property owned by my solo 401(k)?

No, not for a single night. Any personal use by you, your spouse, or other disqualified persons is a prohibited transaction that can disqualify the entire plan and make the full account balance taxable. Paying fair rent to the plan does not fix it.

Can I do my own repairs on a solo 401(k) rental property?

No. The IRS treats unpaid work as an indirect benefit to the plan, so even small repairs must go through an unrelated third-party contractor paid from plan funds. Sweat equity is one of the easiest ways to accidentally create a prohibited transaction.

Does a mortgage on solo 401(k) property trigger taxes?

The loan must be non-recourse, with no personal guarantee. Income and gains attributable to the financed portion of the property are subject to unrelated business income tax (UBIT), reported on Form 990-T. Property bought entirely with plan cash avoids UBIT.

Who is a disqualified person for solo 401(k) real estate?

You, your spouse, your parents and grandparents, your children and grandchildren and their spouses, and businesses you control. The plan cannot buy from, sell to, lease to, or provide services to any of them.

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