Real Estate Tax Calc
The rule and its impact
Under IRC Section 1016(a)(2), your adjusted basis is reduced by depreciation 'allowed or allowable' — the greater of the depreciation you actually deducted and the depreciation you were entitled to claim. When you sell, the IRS computes your gain using this reduced basis. If you skipped some or all of your depreciation deductions in prior years, your basis is still reduced as if you had taken them, and you still owe recapture on the corresponding gain.
This is one of the most misunderstood rules in rental real estate. Investors sometimes skip depreciation hoping to build a higher basis and reduce future gain — but they get the worst of both worlds: they forfeited the annual tax savings and still owe recapture at sale.
How to reclaim missed depreciation
If you discover you missed depreciation in prior years, you have two options: (1) amend the returns for each year — generally only the last three open years; or (2) file Form 3115 (Change in Accounting Method) to claim all missed depreciation in a single current-year catch-up deduction (Section 481(a) adjustment). The Form 3115 method is almost always preferable because it covers all missed years, not just the last three, and requires only a single filing with the current return.
The only real way to avoid recapture
Since you owe recapture on allowed or allowable depreciation regardless, the tax planning focus should be on deferring or eliminating recapture — not avoiding the deduction. Defer with a 1031 exchange, or eliminate via the step-up in basis your heirs receive if you hold the property until death. In the meantime, always claim the depreciation: the annual savings compound forward and the recapture cap of 25% is often below the rate at which you deducted, so the math favors claiming it.
Where the rule comes from
The phrase traces to IRC Section 1016(a)(2), which says basis is adjusted for exhaustion, wear and tear, and obsolescence to the extent of the amount allowed as deductions but not less than the amount allowable. In plain terms, your basis is reduced by the greater of what you actually deducted and what you were legally entitled to deduct. Congress wrote it this way to stop taxpayers from claiming generous depreciation while owning a property and then arguing for a higher basis (and smaller gain) when they sell. The rule is unforgiving in one direction: forgoing the deduction does not preserve basis. That is why depreciation on a rental is best thought of as a use-it-or-lose-it deduction with a mandatory recapture attached, not an optional choice you can defer to improve your position at sale.
A worked example: the cost of skipping depreciation
Imagine two identical investors each buy a $300,000 rental (all building, for simplicity) and sell it years later for $400,000. Investor A dutifully claims $90,000 of depreciation over the hold, saving roughly $90,000 × 32% = $28,800 in income tax along the way. Investor B skips depreciation entirely, saving nothing. At sale, both have the same adjusted basis of $210,000, because the allowed-or-allowable rule reduces B's basis by the depreciation he could have taken. Both report a $190,000 gain, and both owe recapture on $90,000 at up to 25%. Investor B got the worst of both worlds: he forfeited $28,800 of annual tax savings and still pays the recapture. This is the concrete cost of the misconception that skipping depreciation avoids recapture.
Fixing missed depreciation with Form 3115
If you realize you under-depreciated for two or more years, the cleanest fix is usually Form 3115, Application for Change in Accounting Method. Impermissibly failing to take depreciation is treated as an accounting method, so correcting it is an automatic change (commonly designated change number 7) that does not require IRS pre-approval. The correction is made through a Section 481(a) adjustment that sweeps in all the missed depreciation from every prior year — not just the last three — and, because it is a favorable (negative) adjustment, you generally deduct the entire catch-up amount in the current year. That single filing can produce a large one-time deduction, so it often pays to correct the error before you sell, when the deduction is worth more to you than the recapture it eventually generates.
When amending makes more sense than Form 3115
Form 3115 is the right tool when the error spans two or more years. But if you simply made a mistake in one recent year — say you fat-fingered the basis on last year's return — you generally cannot use the automatic method change; you amend that year's return on Form 1040-X instead. The general dividing line the regulations draw is between a one-time error (amend) and an established impermissible method used for two or more consecutive years (Form 3115). Amended returns also reach only open years, typically the last three, so they cannot recover depreciation missed further back — which is precisely why Form 3115 is preferred for long-running omissions.
How it applies to a converted residence
Depreciation is only allowable for the period a property is actually used to produce income. If you lived in a home and later converted it to a rental, depreciation begins at conversion (using the lower of adjusted basis or fair market value at that date), and only that rental-period depreciation is recaptured. Conversely, converting a rental back to a personal residence stops the depreciation clock, but the recapture on depreciation already taken does not disappear — it resurfaces if you later sell, and the Section 121 home-sale exclusion specifically cannot shelter depreciation claimed after May 6, 1997. Owners of mixed-use or converted properties should track exactly which years the property was a rental so the allowable depreciation, and its recapture, are computed on the right period.
What if you claimed too much depreciation?
The rule cuts the other way too. If you over-depreciated — used too short a recovery period, or depreciated land — your basis is reduced by the amount actually allowed (what you deducted), so you do not get to pretend you took less. The fix is again Form 3115 to change back to the correct method, this time producing a positive Section 481(a) adjustment (added to income), or an amended return for a recent one-off error. Either way, ignoring an over-depreciation error does not help: the excess reduced your basis, so it will surface as additional gain or recapture at sale even if you never corrected it. The safest course is to get the recovery period, convention, and land allocation right from year one.
The silver lining: deferral and step-up still work
Because you cannot escape recapture by skipping depreciation, the smart move is to claim every dollar and then manage the recapture through timing. A 1031 exchange rolls the deferred recapture into the replacement property's carryover basis, postponing it — potentially forever if you keep exchanging. Holding until death delivers the step-up in basis under IRC Section 1014, which erases the entire accumulated depreciation and the recapture along with it for your heirs. Both strategies reward you for having taken the depreciation: you captured years of annual deductions and then defer or eliminate the payback. Skipping depreciation forfeits the first half of that equation while leaving the second half fully in place.
It applies to bonus depreciation and Section 179 too
The allowed-or-allowable rule is not limited to ordinary straight-line depreciation — it captures every form of cost recovery, including bonus depreciation and Section 179 expensing on cost-segregated components and equipment. Whatever you deduct up front through accelerated methods still reduces basis dollar-for-dollar and comes back as recapture at sale. Section 179 property carries its own twist: if business use of an asset drops to 50% or less before the end of its recovery period, part of the Section 179 deduction is recaptured as ordinary income in that year, computed on Form 4797. And because cost-segregation studies push depreciation into Section 1245 personal property, that portion recaptures at ordinary rates rather than the 25% Section 1250 cap. None of this changes the core lesson — you owe recapture on what was allowed or allowable regardless — but it means aggressive front-loaded depreciation creates a correspondingly larger, and sometimes higher-rate, recapture bill to plan for at sale.
Frequently asked questions
What if I never claimed depreciation on my rental?
The IRS still reduces your basis for the depreciation you could have taken ('allowable'), so you owe recapture at sale as if you had claimed it. File Form 3115 to recapture the missed deductions before you sell.
Can I avoid recapture by not depreciating the property?
No. Recapture applies to depreciation allowed or allowable. Skipping the deduction forfeits the annual tax savings while leaving the recapture liability intact.
How do I claim depreciation I missed from earlier years?
File Form 3115 (Change in Accounting Method) with your current-year return to claim all missed amounts as a lump catch-up deduction. This does not require amending each prior-year return.
Form 3115 or an amended return — which do I use?
Use Form 3115 when the omission spans two or more consecutive years, because it sweeps in all missed depreciation through a Section 481(a) adjustment in the current year. Use an amended return (Form 1040-X) for a one-time error in a single recent open year.
Does the allowed-or-allowable rule apply to a home I converted to a rental?
Yes, but only for the rental period. Depreciation is allowable from the date of conversion forward, and only that depreciation is recaptured. The Section 121 exclusion cannot shelter depreciation claimed after May 6, 1997.
What if I accidentally depreciated too much or depreciated the land?
Your basis is reduced by the amount actually allowed, so the excess still lowers your basis. Correct it with Form 3115 (a positive Section 481(a) adjustment) or an amended return for a recent one-off error, rather than leaving it to surface as extra gain at sale.
Sources
- IRS Topic No. 409 — Capital Gains and Losses
- IRS Publication 544 — Sales and Other Dispositions of Assets
- IRS Publication 946 — How to Depreciate Property
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.