STR Loss Limitations: Basis, At Risk, Passive (2026)

Short-term rental owners focus almost entirely on the passive activity rules, because that is where the seven-day rule and material participation live. But passive is the third limitation, not the first.

Two other limits screen the loss before IRC Sec. 469 is ever reached, and an owner who clears material participation can still find the deduction blocked. The order matters, because clearing a later limit does nothing if you failed an earlier one.

Limit One: Basis

You cannot deduct a loss exceeding your basis in the activity. For a property held directly, this is your basis in the property. For a partnership interest, it is your outside basis under IRC Sec. 704(d). For an S corporation, it is your stock and debt basis under IRC Sec. 1366(d).

The entity choice matters enormously here and it is where many STR owners create a problem without realizing it.

In a partnership or LLC taxed as a partnership, your basis includes your share of partnership liabilities under IRC Sec. 752. Qualified nonrecourse financing secured by real property is generally allocated to partners and increases basis. A partner who contributed $200,000 of cash to a property with $600,000 of debt has basis well above their cash contribution.

In an S corporation, shareholders do not receive basis for entity-level debt they have not personally lent to the corporation. A shareholder who contributed $200,000 to an S corporation holding a property with $600,000 of bank debt has $200,000 of basis, full stop.

That means an STR generating a $340,000 first-year loss from a cost segregation study, held in an S corporation with $200,000 of shareholder basis, produces a $200,000 deduction and a $140,000 suspended loss. The same property in an LLC taxed as a partnership produces the full deduction.

This is the single strongest argument against holding appreciating real estate in an S corporation, alongside the taxable distribution problem under IRC Sec. 311(b).

Losses blocked by basis carry forward indefinitely and are allowed when basis is restored through additional contributions, income allocations, or, in a partnership, additional debt.

Limit Two: At Risk

IRC Sec. 465 limits deductible losses to the amount you have at risk in the activity.

You are at risk for cash contributed, the adjusted basis of property contributed, and amounts borrowed for which you are personally liable or have pledged property other than property used in the activity.

You are not at risk for nonrecourse debt, generally. But there is a critical exception: qualified nonrecourse financing under IRC Sec. 465(b)(6) is treated as at risk for activities of holding real property.

Qualified nonrecourse financing means debt borrowed with respect to holding real property, from a qualified person such as a bank or other person actively and regularly engaged in lending, that is not convertible, and for which no person is personally liable.

Conventional bank and agency mortgages on real property generally qualify. That means most STR owners clear the at-risk limitation without difficulty.

Where it becomes a problem is seller financing from a related party, loans from the promoter or a related entity, and certain mezzanine or preferred equity structures. An owner who bought from a family member on a seller note may find the debt is not qualified nonrecourse financing and therefore not at risk.

Limit Three: Passive Activity

IRC Sec. 469 is where the STR analysis usually starts and is the third gate, not the first.

Under Treasury Regulation Sec. 1.469-1T(e)(3)(ii)(A), an activity is not a rental activity where the average period of customer use is seven days or less. That removes the automatic passive classification.

You then must materially participate under Treasury Regulation Sec. 1.469-5T. If you do, the loss is non-passive and offsets wages, business income, and portfolio income.

If you do not, the loss is passive, offsets only passive income, and suspends. It carries forward indefinitely and releases on a fully taxable disposition of the entire interest under IRC Sec. 469(g).

The Excess Business Loss Limitation

There is a fourth limit that applies after all three, and it catches high-income owners who cleared everything else.

Under IRC Sec. 461(l), a non-corporate taxpayer's aggregate net business loss deductible against non-business income is capped at an inflation-adjusted threshold. For 2025 the threshold is $313,000 for single filers and $626,000 for joint filers.

An excess business loss is not lost. It converts to a net operating loss carryforward under IRC Sec. 172, deductible in future years subject to the 80% of taxable income limitation.

For an STR investor who ran three cost segregation studies in one year producing $900,000 of non-passive loss against $700,000 of W-2 income, this limitation is binding and part of the benefit defers.

Because non-passive STR losses count as business losses for this purpose, high-income owners stacking multiple studies in a single year should model the limitation rather than assuming the full deduction lands currently.

Worked Example: Same Loss, Three Structures

An investor acquires a $980,000 short-term rental with $240,000 of cash and a $740,000 conventional bank mortgage. A cost segregation study produces a $268,000 first-year loss. The investor materially participates and the average stay is 5.1 nights.

Structure one, held directly or in a single-member LLC: basis is $980,000, well above the loss. Qualified nonrecourse financing means the full amount is at risk. Material participation makes the loss non-passive. The full $268,000 is deductible.

Structure two, held in an LLC taxed as a partnership with two members: each member's outside basis includes their share of the $740,000 of qualified nonrecourse debt under IRC Sec. 752. Both are at risk. The full loss flows through and is deductible.

Structure three, held in an S corporation: the shareholder's basis is the $240,000 contributed, because entity-level bank debt does not create shareholder basis. The deductible loss is capped at $240,000, with $28,000 suspended under IRC Sec. 1366(d) until basis is restored.

Same property, same study, same participation. The entity choice cost $28,000 of current deduction, and would cost far more on a larger loss.

Practical Guidance

Hold short-term rentals in an LLC taxed as a partnership or as a disregarded entity, not in an S corporation. The basis rules and the distribution rules both favor it.

Confirm that acquisition debt is qualified nonrecourse financing for at-risk purposes, particularly with seller financing or related-party loans.

Track basis and at-risk amounts by activity from acquisition. Reconstructing them later is expensive, and both limits carry forward indefinitely, which means the records matter for the whole hold period.

Model the excess business loss limitation before stacking multiple studies into one year. Spreading acquisitions or elections across two years can convert a deferred benefit into a current one.

Frequently Asked Questions

What limits apply to a short-term rental loss?

Four, in order: basis under IRC Sec. 704(d) or Sec. 1366(d), at risk under IRC Sec. 465, passive activity under IRC Sec. 469, and the excess business loss limitation under IRC Sec. 461(l). Clearing material participation only addresses the third one.

Why does an S corporation limit my STR loss?

Because shareholders do not receive basis for entity-level debt they have not personally lent to the corporation. A partner in an LLC taxed as a partnership does receive basis for qualified nonrecourse financing under IRC Sec. 752, which is why partnerships and disregarded entities are preferred for real estate.

Is my mortgage at risk?

Conventional bank and agency mortgages on real property generally qualify as qualified nonrecourse financing under IRC Sec. 465(b)(6) and are treated as at risk. Seller financing from a related party, promoter loans, and some mezzanine structures may not qualify.

What happens to a loss blocked by basis?

It carries forward indefinitely and becomes deductible when basis is restored through additional contributions, income allocations, or, in a partnership, additional debt allocated to you. It is deferred, not lost.

What is the excess business loss limitation?

Under IRC Sec. 461(l), a non-corporate taxpayer's net business loss against non-business income is capped at an inflation-adjusted threshold, $626,000 joint for 2025. The excess converts to a net operating loss carryforward. Non-passive STR losses count as business losses for this purpose.

STR Loss Limitations: Basis, At Risk, and Passive, in That Order