For real estate investors, the value of cost segregation depends less on the study and more on whether you can use the deductions. Rental losses are usually passive, so they only offset passive income unless you qualify as a real estate professional or materially participate in a short-term rental. Timing the study and planning your exit matter just as much.
This content is not tax or financial advice for you. Please talk with a CPA to find what's right for your situation.
The question to ask first: can I use the losses?
A cost segregation study can create a large paper loss in year one. Whether that loss saves you taxes this year depends on how the IRS classifies your rental activity.
| Your situation | What the loss can offset | Notes |
|---|---|---|
| Typical investor with a W-2 job | Passive income only (other rentals, passive businesses) | Unused losses carry forward to future years or until you sell |
| Active participant with modified AGI under $100,000 | Up to $25,000 of non-passive income | Phases out between $100,000 and $150,000 of modified AGI |
| Real estate professional (REPS) who materially participates | Wages, business income, and other active income | Requires 750+ hours and more than half your working time in real estate |
| Short-term rental owner who materially participates | Wages and other active income | Average guest stay must be 7 days or less |
If the losses are passive and you have no passive income, the deductions aren't wasted. They carry forward and can offset future rental profits or be released when you sell the property.
Real estate professional status (REPS)
To qualify, you generally must:
- Spend more than 750 hours a year in real property trades or businesses, and
- Spend more than half of all your working hours in those activities, and
- Materially participate in your rentals (many investors elect to group all rentals as one activity)
Many households use REPS through a spouse who doesn't have a full-time job outside real estate. Keep detailed time logs. The IRS often challenges REPS claims.
The short-term rental approach
When the average guest stay is 7 days or less, the property generally isn't a "rental activity" under the passive loss rules. If you also materially participate (for example, 100+ hours and more than anyone else, including cleaners and managers), losses from cost segregation can offset other income. This is why furnished STRs and cost segregation are often paired.
Timing your study
- Best time: the tax year you buy, build, or finish a major renovation.
- Missed it? A look-back study with Form 3115 catches up all missed depreciation in the current year.
- High-income year? Deductions are worth more in years when you're in a higher bracket.
- Bonus depreciation date: Property must be acquired after January 19, 2025, for permanent 100% bonus. Property acquired earlier follows the old phase-down (40% in 2025, 20% in 2026).
Plan your exit before you start
Accelerated depreciation creates depreciation recapture when you sell. Common ways investors handle it:
- Hold long-term so the time value of the tax savings outweighs the recapture.
- Use a 1031 exchange to defer gain, but plan carefully, because short-life personal property doesn't qualify as like-kind real property.
- Hold until death, when heirs generally get a stepped-up basis.
- Allocate the sale price thoughtfully, since recapture on the short-life parts depends on their value at sale.
A quick strategy checklist
- Confirm whether your losses will be passive or non-passive.
- Run a free feasibility estimate.
- Check your state's rules. Many states don't follow federal bonus depreciation.
- Decide how long you'll hold.
- Get a quality, engineering-based study.
- Have your CPA model this year's and the sale year's taxes.
Frequently asked questions
Should I do cost segregation if I'll sell in two years?
Can both spouses claim REPS?
Do passive losses ever expire?
See what your property may qualify for
Run our 2-minute STR Qualification Quiz or model your Low / Mid / High cost segregation range.
Related guides
Real Estate Cost Segregation: Which Properties Benefit Most
Not every building gets the same cost segregation benefit. See which property types typically reclassify the most and why.
Read guideCost Segregation for Rental Property: Long-Term, Mid-Term, and Short-Term Rentals
Does cost segregation make sense for your rental? Compare long-term, mid-term, and short-term rentals, plus small multifamily, and avoid common mistakes.
Read guideDepreciation Recapture: What It Is and How to Plan for It
Depreciation recapture taxes back some depreciation when you sell. Learn the 25% and ordinary rates, see an example, and explore ways to reduce or defer it.
Read guide1031 Exchange Basics for Real Estate Investors (and How It Works with Cost Segregation)
A 1031 exchange lets you defer taxes when you sell investment property and buy another. Learn the 45- and 180-day rules, boot, and how cost segregation fits in.
Read guideForm 3115 for Cost Segregation: Catch Up Missed Depreciation Without Amending
Form 3115 lets you claim years of missed depreciation in one year, without amending returns. Learn how it works with look-back cost segregation studies.
Read guideThis content is not tax or financial advice for you. Please talk with a CPA to find what's right for your situation.