Does a Solo 401(k) actually solve the UBIT problem on a leveraged IRA rental?

Question

A structure question worth working through carefully. Say an IRA buys a $300,000 four-plex with $200,000 of IRA cash and a $100,000 non-recourse loan, so the debt-financed percentage starts near 33 percent. Gross rent $2,900 a month, operating expenses and interest bring net to roughly $9,000 a year before depreciation, depreciation runs about $8,700 on the building. Two things to understand here. First, the debt-financed percentage does recompute as the loan amortizes, and the twelve-month lookback on average acquisition indebtedness matters for how UBIT gets calculated each year rather than being a one-time snapshot at purchase. Second, a Solo 401(k) is exempt from the debt-financed income rules that apply to IRAs holding leveraged real estate, which is a real structural difference, not a workaround. For someone with self-employment income who could open one, rolling an existing IRA into it is a legitimate fix for this specific problem, though it comes with its own constraints, including that the self-employment activity has to be genuine and the plan has to be administered correctly to keep that exemption intact.

Rena Expert · Accepted Answer

Yes, the debt-financed percentage recomputes. It's based on average acquisition indebtedness over the year against the average adjusted basis, so as the non-recourse loan amortizes the taxable fraction falls, and the twelve-month lookback on the highest debt balance is what keeps you from paying the loan down in December and claiming a low ratio. That mechanic matters most in the year you sell, where a property sold within twelve months of carrying debt drags gain into debt-financed income even if the loan was retired first. Confirm the current computation with a CPA who files 990-Ts, because the ordering rules are where people get it wrong.

Your numbers make the point on their own. Net $9,000 less roughly $8,700 depreciation leaves about $300, and a third of that is debt-financed, so you're inside the $1,000 deduction and owe nothing. That looks free until you notice what depreciation is doing. It's the entire reason the number is small, and depreciation runs out while the loan may not. It also doesn't help on the sale, where the gain is larger and the debt-financed share of it is fully in play.

On the Solo 401(k): a qualified plan is generally outside the debt-financed income rules for real property acquired with non-recourse debt, subject to conditions, and that exemption is genuinely why operators use it. It isn't a wrapper you can just prefer. The plan needs real self-employment income behind it, as @ryanmck27 says, and a traditional IRA rollover into it has to be a permitted rollover of pre-tax money. Rolling a Roth IRA into a Roth 401(k) isn't allowed. If the plan later fails the no-employees test, you're unwinding a plan that owns a four-plex, which is not a paper problem. Prohibited-transaction rules still apply in full either way. Have an ERISA-side professional confirm the plan document actually permits real property and non-recourse debt before you fund anything, since many prototype documents don't.

ryanmck27 · Answer

On the second one, the eligibility test is the hard part. A Solo 401(k) needs genuine self-employment income and no non-owner full-time employees, and that has to keep being true every year the plan exists. I looked at it and my licensing income wouldn't have supported the story.

Does a Solo 401(k) actually solve the UBIT problem on a leveraged IRA rental?

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