Section 163(j) and Apartment Syndications: The Interest Limit and the Real Property Trade or Business Election
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Section 163(j) limits a business's deduction for interest to roughly 30% of its adjusted taxable income (ATI). Small businesses are exempt, but many apartment syndications cannot use that exemption, because a partnership that allocates more than 35% of its losses to limited partners is a "syndicate" and therefore a "tax shelter" under the rules the Form 8990 instructions describe. A real property trade or business can make an irrevocable election out of the limit, at a price: it must depreciate its buildings, residential rental property and qualified improvement property under the slower alternative depreciation system (ADS), with no bonus depreciation on that property. For a leveraged apartment deal, the choice is worth modeling in the first year, because it changes the K-1 losses investors see for the whole hold.
This guide explains who is caught, how the limit works since the 2025 law change, and how to weigh the election. For depreciation basics, see cost segregation and bonus depreciation.
Who is subject to the limit?
The limit applies to business interest of most taxpayers. A small business taxpayer is exempt if it meets the gross receipts test (for tax years beginning in 2025, average annual gross receipts of $31 million or less for the three prior years, adjusted for inflation after that) and is not a tax shelter.
A tax shelter includes any "syndicate" within the meaning of section 1256(e)(3)(B): a partnership or other entity (other than a C corporation) that allocates more than 35% of its losses for the year to limited partners or limited entrepreneurs, people who do not actively take part in management. In a typical apartment syndication, passive investors receive most of the depreciation losses, so in loss years the deal is often a syndicate. The regulations let a taxpayer elect each year to test using the prior year's allocations instead, which can help once the deal turns to taxable income.
How does the limit work?
Deductible business interest for the year is limited to business interest income, plus 30% of ATI, plus floor plan financing interest. The IRS's Form 8990 instructions note that for tax years beginning after 2024, the One Big Beautiful Bill Act again adds back depreciation, amortization and depletion when computing ATI. For an apartment deal, ATI is then roughly the building's operating income before interest and depreciation, after other deductions.
A worked example (made up)
The numbers below are invented to show the math for a deal that is a syndicate.
- Net operating income: $1,000,000. Interest on the loan: $700,000. Depreciation: $900,000 (with cost segregation and bonus depreciation).
- ATI, adding back interest and depreciation, is about $1,000,000. 30% of ATI is $300,000.
- Without the election, only $300,000 of the $700,000 of interest is deductible this year. The other $400,000 becomes excess business interest that passes to the partners and carries forward.
- With the election, all $700,000 of interest is deductible, but the building is depreciated over 30 years under ADS instead of 27.5, and the building portion and improvements get no bonus depreciation. Personal property and land improvements identified by a cost segregation study can generally still use their normal lives and bonus depreciation; ask your CPA.
Which path produces more deductions over the hold depends on the leverage, the interest rate, the cost segregation results and how long the deal will be held.
How to decide
- Model both paths for the expected hold: annual K-1 losses, carryforwards, and the gain and recapture at sale.
- Look at leverage and rate. High interest relative to NOI (bridge loans, floating rates) makes the limit bite harder.
- Look at cost segregation. The more of the basis that is personal property and land improvements, the less the election costs, since those keep their faster depreciation.
- Remember investors. Excess business interest that flows to investors is freed up only by later excess taxable income from the same partnership. If an investor's interest is sold first, the unused amount generally goes back into basis instead of being deducted. That makes their returns harder to follow. See passive loss carryovers.
- Time it. The election is made on a timely filed return and is irrevocable. Decide before the first return is filed.
How DoorRaise fits in
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FAQ
Is my syndication a tax shelter just because it is called a syndication?
The test is about allocations, not the name. A partnership is a syndicate for a year when more than 35% of its losses go to limited partners or limited entrepreneurs.
Does the election affect investors' K-1s?
Yes. It changes depreciation and interest deductions, and so the losses and income on every K-1 for the life of the deal.
Can we make the election later?
It is made on a timely filed return for the year it first applies, and once made it is irrevocable. Decide in the first year with your CPA.
Does the 2025 law change make the election unnecessary?
Not always. Adding back depreciation raises ATI, so more interest is deductible, but a highly leveraged deal can still exceed 30% of ATI. Run the numbers.
Next step: see how deductions reach investors in the K-1 in a real estate syndication.
Sources
- IRS: Instructions for Form 8990, Limitation on Business Interest Expense
- 26 U.S.C. 163, interest (subsection (j))
- 26 U.S.C. 1256, including the definition of syndicate in (e)(3)(B)
- IRS Publication 946, How To Depreciate Property
This article is general information, not tax or legal advice. The example is made up to show the math. Talk to a CPA about your deal. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.