For long-term rental owners, cost segregation is worth it when three conditions line up: you can use the loss this year (REPS or active income offset), the basis is above ~$200K, and you're in the 32%+ bracket. Without REPS or material participation, the losses get suspended as passive, and the time-value benefit drops sharply.
Long-term rentals are presumed passive under IRC §469. The two plays that unlock Year-1 value are Real Estate Professional Status (REPS) — the 750-hour test under §469(c)(7) — or the Form 3115 lookback under §481(a) for properties bought 2+ years ago. Both are well-supported by the IRS Cost Segregation Audit Techniques Guide (Pub 5653).
Rental vs. STR vs. condo — at a glance
| Property type | Reclass to 5/7/15-yr | Year-1 federal benefit | Study cost |
|---|---|---|---|
| SFR (long-term rental) this page | 16–22% | $15K–$50K | From $495 |
| STR (Airbnb) | 20–28% | $20K–$80K | From $495 |
| Condo | 14–18% | $10K–$35K | $495–$1,495 |
Ranges from internal benchmarks across 4,000+ studies. Year-1 federal benefit assumes 37% bracket and full first-year usability. Use the full calculator to plug in your bracket and basis.
The REPS pre-condition
Without REPS — 750+ hours/yr and more than half of your working time in real estate trades — your accelerated losses are limited to passive income. They carry forward, but the time value shrinks every year. REPS pairs well with multiple rentals, a spouse who can claim it, or a year you're not also working full-time in another industry.
The Form 3115 angle
If you bought rental property 2+ years ago and never did a cost-seg study, the Form 3115 lookback is one of the highest-leverage tax moves available. The cumulative missed accelerated depreciation lands as a §481(a) adjustment on your current-year return — no amended returns needed. On a 5-year-old $500K rental, that catch-up can easily exceed $30K-$50K.
Real rental examples
Estimates assume 37% federal bracket and full first-year usability (REPS or active income offset). Your actual benefit depends on bracket, basis allocation, and your CPA's treatment.
When it works
- REPS qualifier with multiple rentals
- Active income offset available (spouse with REPS, business income to offset)
- Property bought 2+ years ago, never studied (Form 3115 catch-up)
- Sale planned 5+ years out (recapture impact softens)
When it doesn't
- Single rental, no REPS, no other passive income
- Sale planned within 12 months
- Basis under ~$150K