Converting Rental Property to Personal Use (or Vice Versa): Tax Rules and Basis Adjustments

By Yarik Yarosh, CPA ·September 5, 2026 ·Updated September 23, 2026 ·8 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Property conversions between personal and rental use create some of the most complex basis calculations in individual taxation. The fundamental rule is that the tax basis for depreciation when converting personal property to rental use is the lower of the property’s adjusted basis (usually cost minus any casualty loss deductions) or its fair market value on the date of conversion. Under Reg. 1.168(i)-4, this “lower of” rule prevents the owner from creating artificial depreciation deductions based on a decline in value that occurred during personal use (personal losses are generally non-deductible). When converting in the other direction (rental to personal), depreciation stops on the conversion date, and all depreciation previously taken (or allowable) permanently reduces the property’s basis. The interaction of these rules with the IRC 121 primary residence exclusion, the depreciation recapture rules, and the nonqualified use provisions creates planning opportunities and traps that every property owner should understand before making a conversion.

✓Key takeaway

Conversion rules summary:

Conversion	Depreciable Basis	Key Rule
Personal to rental	Lower of: adjusted basis or FMV on conversion date	If FMV < basis, the decline during personal use is a permanent non-deductible loss
Rental to personal	Stop depreciation; basis = cost minus depreciation allowed or allowable	Depreciation “allowed or allowable” reduces basis whether or not actually claimed
Personal to rental, then sell at a loss	Loss basis = adjusted basis at conversion (original cost minus any adjustments)	The higher original basis is used for loss calculations (not the lower FMV)

IRC 121 exclusion and nonqualified use:

Rule	Details
IRC 121 exclusion	$250,000 (single) / $500,000 (MFJ) of gain on sale of primary residence
Ownership and use test	Must own and use as primary residence for 2 of the 5 years before sale
Nonqualified use (IRC 121(b)(5))	Gain allocated to periods of nonqualified use (rental) after 2008 is NOT excludable
Depreciation recapture	Gain attributable to depreciation is NEVER excludable (always recaptured at 25%)

How do property conversions affect your taxes?

Hypothetical example

Round numbers. For current guidance, see IRS rental income tips. A homeowner purchased their primary residence in 2015 for $400,000. In 2020, they moved out and converted it to a rental property. In 2027, they sell it for $600,000.

Step 1: Determine depreciable basis at conversion (2020)

Item	Amount
Original cost	$400,000
Land value (not depreciable, 20%)	($80,000)
Building cost basis	$320,000
FMV of building at conversion (2020)	$350,000
Depreciable basis = lower of basis ($320,000) or FMV ($350,000)	$320,000

Since FMV ($350,000) exceeds basis ($320,000), the full cost basis is used for depreciation.

Step 2: Calculate depreciation during rental period (2020-2027, 7 years)

Year	Annual Depreciation (27.5-year SL)	Cumulative
2020 (partial year, assume mid-month)	~$9,700	$9,700
2021-2026 (6 full years)	$11,636/year x 6	$69,816
2027 (partial year to sale date)	~$5,800	$5,800
Total depreciation		$85,316

Step 3: Calculate gain on sale (2027)

Item	Amount
Sale price	$600,000
Adjusted basis: $400,000 - $85,316 depreciation	$314,684
Total gain	$285,316

Step 4: Apply IRC 121 exclusion and nonqualified use rules

Period	Years	Use
2015-2020 (5 years)	Personal use	Qualified
2020-2027 (7 years)	Rental (nonqualified use)	Nonqualified (post-2008 rental)
Total ownership	12 years

Does the owner meet the 2-of-5 year test? The owner must have lived in the home for 2 of the 5 years before the sale (2022-2027). They moved out in 2020, so they did NOT live there for any of the 5 years before the 2027 sale. IRC 121 exclusion does not apply.

Tax on the sale	Amount
Depreciation recapture ($85,316 at 25%)	$21,329
Remaining gain ($285,316 - $85,316 = $200,000 at 20% + 3.8% NIIT)	$47,600
Total tax	$68,929

Alternative: Sell in 2024 (within 5 years of moving out) If the owner sells in 2024 while still meeting the 2-of-5 year test:

Period	Years	Use
2015-2020	5 years personal (meets 2-of-5 test looking back from 2024)	Qualified
2020-2024	4 years rental	Nonqualified
Total ownership	9 years

Nonqualified use ratio: 4/9 = 44.4% (post-2008 rental periods)

Gain allocation	Amount
Total gain (assume $230,000 after depreciation)	$230,000
Depreciation (not excludable)	$46,545
Remaining gain	$183,455
Nonqualified use portion: 44.4% x $183,455	$81,454 (not excludable)
Qualified use portion: 55.6% x $183,455	$101,901 (excludable under IRC 121, up to $250K)
Tax on depreciation recapture (25%)	$11,636
Tax on nonqualified gain (23.8%)	$19,386
Tax on qualified gain	$0 (excluded)
Total tax	$31,022

Selling within the 5-year window saves $37,907 in tax.

Scenario: Personal to rental when FMV is BELOW cost Owner purchased for $400,000, converts to rental when FMV is $300,000.

Item	Amount
Cost basis	$400,000
FMV at conversion	$300,000
Depreciable basis (lower of cost or FMV)	$300,000 (building portion: $240,000)
“Lost” basis ($400,000 - $300,000)	$100,000 (this decline during personal use is never deductible)

If later sold for $350,000:

Item	Amount
Sale price	$350,000
Gain basis (adjusted cost: $400,000 - depreciation)	$400,000 - depreciation on $240,000
Loss basis	Same (original cost minus depreciation)
Since sale price ($350,000) is between $300,000 (FMV at conversion) and $400,000 (original cost), there’s NO gain or loss	$0

This is the “twilight zone” where the sale price falls between the FMV at conversion and the original cost. No gain (because basis for gain is $400,000 minus depreciation, and sale price is below that), and no loss (because basis for loss is $300,000 minus depreciation, and sale price is above that).

Converting rental back to personal use:

Rule	Details
Stop depreciating	On the date of conversion to personal use
Basis = cost minus all depreciation “allowed or allowable”	Even if you failed to claim depreciation, basis is reduced
”Allowed or allowable”	Whichever is greater: depreciation you actually claimed OR depreciation you should have claimed
If you never claimed depreciation	Basis is STILL reduced by the amount that should have been claimed
Fix: File Form 3115	If you failed to claim depreciation, file Form 3115 to catch up before converting

Planning considerations:

Strategy	Benefit
Sell within 5 years of moving out	Preserve IRC 121 exclusion eligibility
Move back in for 2 years before selling	Re-establish primary residence status
File Form 3115 for missed depreciation before converting to personal	Claim the catch-up deduction; basis is reduced either way
Get an appraisal at conversion date	Documents FMV for the “lower of” test
Track rental and personal use periods carefully	Nonqualified use ratio directly affects the excludable gain
Consider 1031 exchange instead of conversion	Defer all gain; keep the property in rental use

Illustrative numbers only, not a real client and not advice for your facts.

What is real estate professional status and why does it matter for taxes?

Real estate professional status (REPS) under IRC 469(c)(7) removes the automatic passive label from rental real estate, so if you also materially participate, rental losses can offset ordinary income without the $25,000 active participation limitation. To qualify, you must spend more than 750 hours in real property trades or businesses in which you materially participate during the year AND more than half of your total working hours must be in those activities. Each rental property must be separately evaluated for material participation unless you elect to aggregate all rental activities. This status is particularly valuable for taxpayers with significant rental depreciation deductions that would otherwise be suspended as passive losses. Losses still have to clear the at-risk rules first, and very large ones can be capped by the excess business loss rule. The IRS closely scrutinizes REPS claims, so detailed time logs are essential.

Related guides:

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Cite this page

Yarik Yarosh, CPA. "Converting Rental Property to Personal Use (or Vice Versa): Tax Rules and Basis Adjustments." Blue Cloud CPA, September 5, 2026, updated September 23, 2026. https://bluecloudcpa.com/guides/small-business-tax-implications-converting-rental-to-personal-use

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.