# Cost segregation for a primary residence turned rental

Converting your home to a rental changes its basis, dates and bonus eligibility. What a study can and cannot do for a converted home, and the sale rules.

## Short answer

When you move out of your home and rent it, three things change that a cost segregation study has to respect. The depreciable basis becomes the lesser of your adjusted basis or the home's fair market value on the date of conversion, not what you paid years ago and not what it is worth now, whichever is higher. The placed-in-service date for rental purposes is the date the home was ready and available for rent, not the date you bought it. And bonus depreciation is generally unavailable on the converted property itself, because used property qualifies only if you did not use it before acquiring it, and you lived in it. A study can still separate land, land improvements and personal property and put each in its class, but the first-year effect is smaller than for a purchased rental. The sale rules add a fourth point: the home-sale exclusion does not cover gain equal to depreciation after May 6, 1997, and periods of nonqualified use reduce the exclusion. This article works through each. It is general education, not tax advice.

## The three things conversion changes

| Item | For a purchased rental | For a converted home |
|---|---|---|
| Basis for depreciation | Cost plus settlement costs, less land | The lesser of adjusted basis or fair market value at conversion, less land |
| Placed-in-service date | When ready and available for rent after purchase | The conversion date, when the home is ready and available for rent |
| Bonus depreciation on the property | Available on 5-, 7- and 15-year components of qualified property acquired after January 19, 2025 | Generally not available on components of the converted home, because you used the property before the rental acquisition; later purchases are separate assets with their own eligibility |

## Basis: the lesser-of rule

Publication 527 is direct: when you change property from personal to rental use, the basis for depreciation is the lesser of its adjusted basis or its fair market value at the time of the change. If your home has appreciated, your depreciable basis is your adjusted basis, which is cost plus improvements less any depreciation from an earlier rental or home-office use. If it has fallen in value, the lower fair market value applies. Land is separated from that figure by fair market value at conversion, and a study reconciles to the result.

Improvements made after 1986 are separate depreciable property, which for a study means each improvement is its own asset with its own class and, usually, the original conversion-date placed-in-service date if it was already in place.

## Dates: conversion is the placed-in-service date

Depreciation begins when the property is ready and available for its use; for a rental, when it is ready and available for rent. The conversion date is that date, and it governs the convention and the first year's deduction. Renovations done between moving out and listing the home are separate assets placed in service when complete.

## Bonus depreciation: why the converted home usually does not qualify

The rules for used property require, among other things, that the property was not used by the taxpayer at any time before its acquisition. A home you lived in fails that test, so the components of the converted home are not qualified property for bonus depreciation even though they are now in 5-, 7- and 15-year classes. They still depreciate faster than the house, which is the study's benefit, but there is no 100 percent first-year deduction on them. Appliances, flooring, fencing or paving that you buy new after conversion are different: they are new assets acquired for the rental, and their eligibility is judged on their own acquisition dates.

Practitioners sometimes project a converted home as though it were a purchase. Ask, specifically, whether the projection applies bonus depreciation to the converted components, and if so, why.

## What a study can still do

- Separate land from building at conversion, which owners often skip.
- Identify land improvements and personal property and put them in their classes, accelerating their depreciation against the 27.5-year default.
- Record the assets so that later replacements can be treated as dispositions.
- Produce a schedule your adviser can carry forward and that supports the sale computation later.

The amounts depend on the house, exactly as for any single-family rental: land share, site work, furnishings.

## Using the loss

Rental losses are generally passive. An active participant may deduct up to $25,000 of rental loss against other income, phased out between $100,000 and $150,000 of modified adjusted gross income. Many owners who convert a home have a salary above that range, so the accelerated deductions become suspended losses rather than current savings. Model this with your adviser before commissioning a study.

## The sale: exclusion, recapture and nonqualified use

Owners convert homes intending to sell within a few years and keep the home-sale exclusion. Three rules interact.

1. **The exclusion** of up to $250,000 of gain, or $500,000 for a married couple filing jointly, requires ownership and use as a residence for at least 24 months of the 5 years before the sale. A home rented for a few years after you moved out can still meet it.
2. **Depreciation is not excludable.** Gain equal to depreciation allowed or allowable after May 6, 1997 cannot be excluded and is reported under the recapture rules: depreciation on section 1245 property a study identified is ordinary income, and the building's depreciation is unrecaptured section 1250 gain at up to 25 percent.
3. **Nonqualified use.** Periods after 2008 during which the property was not your principal residence are, with exceptions, nonqualified use, and gain allocable to those periods may not be excluded. The exceptions include certain periods after you last used the home as a residence; the computation is your adviser's.

The practical effect is that accelerating depreciation on a home you plan to sell under the exclusion accelerates the part of the gain the exclusion will not cover. Whether that trade is worth it depends on the timing and on the rest of your return.

## A short sequence for owners converting a home

1. Fix the conversion date and document that the home was ready and available for rent.
2. Establish adjusted basis and fair market value at conversion; use the lesser.
3. Separate land at conversion with evidence.
4. Decide with your adviser whether a study is worth it, remembering that bonus depreciation is generally unavailable on the converted components.
5. If you expect to sell under the exclusion, model the depreciation, recapture and nonqualified-use effects before accelerating anything.

## What people ask on Reddit and other forums

Conversions are a steady topic in the "cost segregation reddit" threads on r/realestateinvesting and r/tax. The searches that lead people to these threads are usually phrased "convert primary residence to rental depreciation", "cost segregation converted rental" and "basis of converted rental property".

**"Can I do cost seg on my old house now that it's a rental?"** Yes, on the lesser-of basis at conversion, with the conversion date as placed in service, and generally without bonus depreciation on the converted components.

**"Why doesn't bonus apply? It's a rental now."** Because used property must not have been used by you before you acquired it for the rental, and you lived there.

**"I'll sell in two years and take the exclusion. Should I accelerate?"** Depreciation after May 6, 1997 is not excludable and is recaptured; accelerating it does not change that total but moves deductions earlier. Model it with your adviser before deciding.

**"Do I use what I paid or what it's worth?"** The lesser of adjusted basis or fair market value at conversion.

## Questions people also ask

### What is the depreciable basis of a home converted to a rental?

The lesser of its adjusted basis or its fair market value on the conversion date, less the land, per Publication 527.

### Does bonus depreciation apply to a converted home?

Generally not to the converted property, because used property qualifies only if you did not use it before acquiring it. New assets bought for the rental after conversion are judged on their own.

### Can I still use the home-sale exclusion after renting the house?

If you meet the ownership and residence tests, yes, but gain equal to depreciation after May 6, 1997 is not excludable, and periods of nonqualified use reduce the exclusion.

### When does depreciation start on a converted home?

When the home is ready and available for rent, which is the conversion date, not the original purchase date.

### Is a study worth it on a converted home?

Sometimes: it separates land correctly and accelerates land improvements and personal property. Without bonus depreciation on the converted components and with a possible sale under the exclusion, the case is narrower than for a purchased rental. Ask your adviser.

## Sources

- https://www.irs.gov/publications/p527 — IRS Publication 527 (2025), Residential Rental Property: Chapter 2 (property classes) and Chapter 4 (property changed to rental use).
- https://www.irs.gov/publications/p946 — IRS Publication 946 (2025), How To Depreciate Property: Chapter 1, placed in service.
- https://www.law.cornell.edu/uscode/text/26/168 — 26 U.S.C. §168(k)(2)(E)(ii), acquisition requirements for used property.
- https://www.irs.gov/publications/p523 — IRS Publication 523 (2025), Selling Your Home: eligibility test; depreciation after May 6, 1997; nonqualified use.
- https://www.irs.gov/publications/p925 — IRS Publication 925 (2025), Passive Activity and At-Risk Rules: special allowance.
- https://www.irs.gov/publications/p544 — IRS Publication 544 (2025), Sales and Other Dispositions of Assets: Chapters 3 and 4.

## Related reading

- [Cost segregation for a single-family rental](/articles/cost-segregation-single-family-rental)
- [Acquisition date vs placed-in-service date](/articles/acquisition-date-vs-placed-in-service-date)
- [Depreciation recapture after cost segregation](/articles/depreciation-recapture-after-cost-segregation)
- [Bonus depreciation and cost segregation after the 2025 law](/articles/bonus-depreciation-and-cost-segregation)
- [Cost segregation for a house hack or owner-occupied duplex](/articles/house-hack-and-owner-occupied-duplex)
- [What Reddit asks about cost segregation, answered with sources](/articles/cost-segregation-questions-from-reddit)
- [Find a practitioner in the NBCSS directory](/directory)

---
Canonical: https://nbcss.org/articles/primary-residence-converted-to-rental
Published: 2026-09-25 · Last content change: 2026-09-25
Not professional advice: general educational information from the National Board of Cost Segregation Specialist (NBCSS); not accounting, tax, legal, financial, investment or engineering advice. Verify with a licensed CPA, enrolled agent, attorney or other qualified adviser before acting.