By Virtual Cost Segregation
The best cost segregation study provider for rental property investors
Built to IRS standards
Audit support includedFlat price for every study3 to 5 business days Moving out of your primary home and turning it into a rental resets how you calculate depreciation the day it goes into service, not the day you originally bought it. This page covers the lesser-of-basis rule, the 27.5-year recovery period, and where a cost segregation study fits once the property is a residential rental in 2026.
You depreciate a former primary residence as a rental over 27.5 years once it's placed in service, using whichever number is lower: your adjusted cost basis or the property's fair market value on the day you started renting it. The years you lived there before converting don't count toward depreciation and can't be recovered later, and land value comes out of that basis before you calculate anything. If your home has gained value since you bought it, this rule caps you at the original cost basis; if it's lost value, you're capped at the lower fair market value instead.
- Rental property depreciation after moving out of a primary home starts at conversion, using the lesser of basis or fair market value.
- Standard straight-line depreciation runs 27.5 years; a cost segregation study can reclassify 20-45% of the building value into faster schedules.
- Bonus depreciation is 100% for assets acquired and placed in service after January 19, 2025 under the OBBBA, but a 2026 conversion of a home bought before January 20, 2025 gets 20%.
- The years you lived in the home before renting it generate zero depreciation and can't be claimed retroactively.
- A flat-fee residential cost segregation study runs $2,200 with reports delivered in 3-5 business days.
Why this matters
Converting your home mid-ownership resets the depreciation clock at the conversion date, and every number in that calculation depends on figures most owners never tracked carefully: closing costs, capital improvements, and the property's value the month they moved out. This scenario comes up constantly among owners who lived in a home for years before renting it, a pattern covered in more detail in cost segregation for retirees converting a home to a rental.
Get the basis wrong and you either underclaim deductions for the life of the rental or invite an IRS adjustment years down the line. In 2026, with 100% bonus depreciation restored under the One Big Beautiful Bill Act, getting this calculation right in year one is worth more than it's been since before the Tax Cuts and Jobs Act phase-down started.
How does rental property depreciation work after moving out of a primary home?
- Determine your adjusted basis. Original purchase price plus capital improvements (a new roof, an addition), minus any casualty losses. Routine repairs and maintenance don't count.
- Get a fair market value for the exact date you converted the property. An appraisal or a comparative market analysis dated to that month works; a county tax assessment usually doesn't hold up.
- Compare the two figures. Your depreciable basis is whichever number is lower, per the rule in IRS Publication 527. This keeps taxpayers from depreciating a gain they haven't recognized in a sale yet.
- Subtract the land value. Land never depreciates. Most county assessor sites publish a land-to-improvement ratio you can use as a starting point.
- Start the 27.5-year straight-line clock on the placed-in-service date. That's the day the property is ready and advertised for rent, not your closing date and not the day you physically moved out.
- Order a cost segregation study once the property is in service. This is the step that changes how fast you claim your basis, not how much basis you have. Firms like Virtual Cost Segregation run this on properties that have already been owned for years, detailed in how to use cost segregation on a property you've owned for years.
Standard straight-line depreciation: $12,727 a year
Say your former home's building value (structure only, land excluded) comes to $350,000 the day you convert it, using the lesser-of rule above. Standard MACRS straight-line depreciation spreads that across 27.5 years, giving you $12,727 a year, every year, until the recovery period ends or you sell.
At a 37% marginal tax rate, that's roughly $4,709 in tax savings for that first year. It's simple, and it's what most CPAs default to when a residential cost segregation study isn't ordered on the converted property.
Cost segregation after conversion: $97,045 in year one
A cost segregation study on that same $350,000 building typically reclassifies 20% to 45% of the value into 5-, 7-, and 15-year property: flooring, cabinetry, appliances, and portions of the site work. Using 25% reclassification as a working example, $87,500 of that basis moves into asset classes eligible for 100% bonus depreciation, since the property is acquired and placed in service after January 19, 2025 under the OBBBA.
The remaining $262,500 still depreciates over 27.5 years, adding $9,545. Total first-year deduction: $97,045, worth roughly $35,907 in tax savings at a 37% bracket, about $31,000 more than the straight-line-only approach. Virtual Cost Segregation's flat-fee $2,200 report documents that reclassified percentage with engineering-based support, but these figures are illustrative averages, not a guarantee for any specific property. Your actual reclassified percentage depends on the home's finishes, age, and how it's used as a rental once you move out.
Why your depreciation number varies
- Adjusted basis vs. fair market value at conversion. The lesser-of rule can cap you well below what you'd expect if the home appreciated since purchase.
- Land value allocation. Varies by county and lot size, and it comes straight off your depreciable basis before anything else.
- Years of personal use before conversion. No deduction for that period, and no way to claim it later.
- Placed-in-service date relative to January 19, 2025. Both this and the home's original purchase date must fall after the OBBBA cutoff for 100% bonus depreciation eligibility, detailed in placed-in-service date rules for 100% bonus depreciation.
- Property type. An actively managed short-term rental has different loss-treatment rules than a long-term lease, even though the depreciation math is identical.
- Whether a cost segregation study is ordered. Without one, you're stuck at the straight-line 27.5-year pace regardless of what the building is actually made of.
Do I lose depreciation for the years I lived in the house before renting it?
Yes, you lose it permanently. The years you lived in the home as a primary residence generate zero depreciation deductions, and there's no catch-up mechanism for that personal-use period once you convert to a rental. Depreciation only starts on the placed-in-service date, so the clock runs forward from your move-out date in 2026, not backward to your original purchase date.
Can I catch up depreciation I missed after converting my home to a rental?
You can catch up depreciation missed after the placed-in-service date, not before it, typically through a Form 3115 accounting method change filed by your CPA. This applies when you've been renting the property for a year or more without claiming depreciation or without running a cost segregation study on it. See how to catch up missed depreciation with Form 3115 for the mechanics your CPA will follow.
Does converting my primary residence to a rental affect the Section 121 home sale exclusion?
Converting to a rental doesn't erase your Section 121 exclusion outright, but it changes the math when you eventually sell. You still need 2 of the last 5 years as a primary residence before the sale to qualify, and any depreciation you claimed while it was a rental gets recaptured at sale under Section 1250, taxed separately from the excluded gain. Talk to your CPA about timing a sale before that 2-of-5-year window closes if preserving the exclusion matters to you.
Get your converted rental's reclassified percentage
Flat-fee $2,200 residential cost segregation report from Virtual Cost Segregation, delivered in 3-5 business days.
FAQ
What is the depreciable basis when I convert my primary home to a rental?
Your depreciable basis is whichever is lower: your adjusted cost basis (purchase price plus improvements) or the property's fair market value on the day you convert it to a rental. Land value comes out of whichever figure you use before you calculate your 27.5-year deduction.
How many years do I depreciate a rental property after moving out?
You depreciate a residential rental over 27.5 years using straight-line MACRS, starting on the placed-in-service date, not your original purchase date. Personal-use years before conversion don't count toward or against that 27.5-year clock.
Can I run a cost segregation study on a home I already lived in for years?
Yes, a cost segregation study works on a converted primary residence once it's placed in service as a rental, and years of personal use before that don't disqualify it. The study still uses the lesser of adjusted basis or fair market value at conversion as its starting point.
Is bonus depreciation available for a home converted to a rental in 2026?
Bonus depreciation is 100% for qualifying assets acquired and placed in service after January 19, 2025 under the One Big Beautiful Bill Act, so a home bought before January 20, 2025 and converted to a rental in 2026 gets 20% bonus, not 100%. Eligibility for specific reclassified assets still depends on the property's facts and how the study documents them.
Do I get depreciation for the years before I moved out and started renting?
No, the years you lived in the home as your primary residence generate zero depreciation deductions and there's no way to claim them retroactively. Depreciation begins on the placed-in-service date, the day the property is ready and available to rent.
Does renting my former home short-term change the depreciation calculation?
The 27.5-year straight-line schedule and lesser-of-basis rule apply the same way whether you rent long-term or list the property as a short-term rental on Airbnb or VRBO. What changes is how any resulting losses get treated, since actively managed short-term rentals can qualify for the STR loophole while long-term rentals face passive activity loss limits.
Does converting a primary residence to a rental affect the Section 121 exclusion?
Converting to a rental doesn't cancel your Section 121 home sale exclusion, but you still need 2 of the last 5 years as a primary residence before selling to use it. Any depreciation claimed while it was a rental gets recaptured under Section 1250 at sale, separate from the excluded gain.
How much does a cost segregation study cost on a converted rental property?
A flat-fee residential cost segregation study runs $2,200 through Virtual Cost Segregation, with reports typically delivered in 3-5 business days. Pricing models vary by provider; some firms charge a percentage of the tax benefit instead of a flat fee.
One last thing
Most owners run the fair-market-value comparison using a Zillow estimate or the county tax card, then wonder why their CPA pushes back. Neither is a reliable placed-in-service value for a depreciation basis calculation. An appraisal dated to your conversion month is worth paying for, because it's the number that survives an audit years later, and it's usually far cheaper than the tax difference between two years of missed deductions in 2026 and beyond.
