It can, and for real estate professionals and short-term rental operators it regularly does. When bonus depreciation from a cost segregation study pushes total deductions past total income, the excess does not simply vanish or deduct freely. It passes through a sequence of gates, each with its own statute, and what survives becomes a net operating loss.
The gates, in order
1. Passive activity rules, IRC 469. Passive losses never reach the NOL computation; they suspend on Form 8582. Only non-passive losses continue, meaning real estate professional status with material participation under IRC 469(c)(7), or short-term rentals outside the rental definition under Reg 1.469-1T(e)(3) with material participation. Fund and syndication investors should note that basis and at-risk limits under IRC 704(d), 1366, and 465 apply even before the passive rules.
2. Excess business loss cap, IRC 461(l). Net business losses deductible against non-business income are capped at $313,000 for single filers and $626,000 for joint filers in 2025, indexed annually, and OBBBA made this limitation permanent. Anything above the cap converts automatically into an NOL carryforward for the next year.
3. NOL rules, IRC 172. Losses arising after 2020 carry forward indefinitely with no carryback for most taxpayers, and in any carryforward year the deduction is limited to 80% of taxable income computed before the NOL.
Worked example
A married couple files jointly in 2026. One spouse qualifies as a real estate professional and closes on 2 rentals whose cost segregation studies produce $800,000 of bonus depreciation under IRC 168(k), leaving a $740,000 non-passive rental loss. The other spouse earns $250,000 in wages. IRC 461(l) allows $626,000 of the business loss this year; the remaining $114,000 becomes an NOL carryforward immediately. The allowed $626,000 eliminates the $250,000 of wages and other income, driving taxable income to zero and generating a further NOL of roughly $376,000 before adjustments. Entering 2027 with about $490,000 of combined carryforward and $300,000 of taxable income, the couple can deduct 80% of that income, $240,000, pay tax on the remaining $60,000, and carry roughly $250,000 forward again.
Caveats
- An NOL is deferral with a drag: the 80% limit guarantees some tax is due in every profitable carryforward year.
- Wages are not business income for the 461(l) netting, though the allowed loss still shelters them as ordinary taxable income.
- States diverge sharply. Many decouple from bonus depreciation or run separate NOL regimes, so the federal result rarely translates one for one.
- Electing out of bonus under IRC 168(k)(7) is sometimes smarter than banking a huge NOL, especially when future rates or income are uncertain.
Amadae's filing engine computes the 461(l) limitation, the Form 8582 interplay, and the NOL carryforward schedule as part of return preparation, and the free Tax Strategy Projector shows how a planned study lands across all three gates before you commission one.