If you own a rental and never claimed depreciation, or claimed the wrong amount, you can recover every missed dollar in one year by filing IRS Form 3115 to change your accounting method. The catch-up depreciation on rental property flows through as a single Section 481(a) adjustment on your current return, so you don’t amend prior years and there’s no cap on how far back the correction reaches.
Why Doing Nothing Is the Worst Option
Residential rental property depreciates over 27.5 years, straight-line, under MACRS.1Office of the Law Revision Counsel. 26 US Code 168 – Accelerated Cost Recovery System The depreciable basis is the cost of the property minus the land value, since land itself never depreciates. Landlords commonly split the two using the local property tax assessment ratio, an independent appraisal, or the insurance replacement cost of the structure.
A common assumption is that skipping depreciation preserves basis and defers tax until sale. It doesn’t. The “allowed or allowable” rule reduces your basis each year by the depreciation you were entitled to claim, whether you claimed it or not.2Office of the Law Revision Counsel. 26 USC 1016 – Adjustments to Basis When you sell, the IRS treats your basis as if you had taken every year’s depreciation, and you’ll owe recapture tax on that amount regardless. Skip it, and you lose the deduction twice: once when you paid tax on rental profits it should have offset, and again when you pay recapture on deductions you never actually took.
Calculating the Section 481(a) Adjustment
The catch-up amount is the gap between the depreciation you should have claimed since the property was placed in service and what you actually claimed. If you claimed nothing, the adjustment equals the full cumulative allowable amount.
Start with your corrected depreciable basis and the exact month and year the property was placed in service. Recalculate correct MACRS depreciation for each year from that date through the end of the year before your year of change. Residential rental property uses the mid-month convention, which treats the property as placed in service at the midpoint of the month it went into service, so your first partial year won’t be a full twelve months of depreciation.1Office of the Law Revision Counsel. 26 US Code 168 – Accelerated Cost Recovery System
Total those recalculated years, subtract any depreciation you did claim, and the result is your Section 481(a) adjustment.3Office of the Law Revision Counsel. 26 US Code 481 – Adjustments Required by Changes in Method of Accounting For missed depreciation, this is a negative adjustment that reduces taxable income. Negative Section 481(a) adjustments are taken in full in the year of change, so the whole deduction hits at once instead of being spread out.
As a quick illustration: a property placed in service in January 2019 with a $275,000 depreciable basis produces about $10,000 in annual straight-line depreciation. By a 2026 correction, roughly $70,000 of missed depreciation would flow onto that year’s return as a single deduction.
Filing Form 3115
The IRS treats a failure to claim the right depreciation as an impermissible accounting method. Fixing it requires a formal change in method, which means Form 3115. You can’t just start depreciating going forward, and you can’t amend each prior return to add it. Form 3115 is the only accepted route.
Most rental owners qualify for the automatic consent procedure under Revenue Procedure 2022-14 or its successor, so no individual IRS approval is required. On the form, reference the designated change number that matches your situation. For correcting an impermissible depreciation method to a permissible one on property you owned at the start of the year of change, that’s DCN 7.4Internal Revenue Service. Instructions for Form 3115
The Section 481(a) adjustment goes on Part IV, Line 26 of Form 3115.4Internal Revenue Service. Instructions for Form 3115 That figure carries to Schedule E as an additional depreciation expense for the year of change, on top of your regular current-year depreciation.
How and When to File
Under automatic consent, Form 3115 is filed in duplicate.4Internal Revenue Service. Instructions for Form 3115 The original is attached to your timely filed federal return (including extensions) for the year of change and does not need to be signed. A signed duplicate is mailed or faxed to the IRS office in Ogden, Utah, no earlier than the first day of the year of change and no later than the date you file the return.
The deadline for the whole filing is the due date of your return for the year of change, with extensions. Miss it, and you wait until the next tax year to make the change.
Using a Cost Segregation Study to Increase the Catch-Up
A cost segregation study is an engineering analysis that pulls individual building components out of the 27.5-year bucket and reassigns them to shorter recovery periods. When the study is done years after the property was placed in service, the accelerated depreciation that should have been taken in prior years lumps into the same Section 481(a) adjustment.
The reclassified components generally fall into three buckets:5Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
- 5-year property: appliances, carpeting, removable floor coverings, window treatments, ceiling fans, security systems, and decorative light fixtures.
- 7-year property: office furniture, desks, filing cabinets, and similar furnishings.
- 15-year land improvements: driveways, sidewalks, fencing, landscaping, irrigation systems, outdoor lighting, and retaining walls.
Because these assets depreciate over 5, 7, or 15 years instead of 27.5, the schedule front-loads far more depreciation into the early ownership years. A study run five or six years in often produces a six-figure catch-up, depending on basis and how much is reclassified.
Short-life assets identified by a study can also qualify for bonus depreciation. For qualifying property acquired and placed in service after January 19, 2025, the One Big Beautiful Bill Act permanently restored 100% bonus depreciation with no phase-down.6Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill The applicable bonus percentage keys off the property’s original placed-in-service date, not the date of the study, and the bonus amount folds into the same Section 481(a) adjustment.
Studies aren’t cheap. Industry pricing generally runs $5,000 to $10,000 depending on complexity, and the common rule of thumb is that the numbers start working when depreciable basis reaches at least $500,000. Below that, the tax savings may not justify the fee.
Passive Activity Rules Can Cap the Deduction This Year
Rental income is almost always passive, so rental losses generally only offset other passive income.7Office of the Law Revision Counsel. 26 US Code 469 – Passive Activity Losses and Credits Limited A large catch-up deduction that pushes your rental to a paper loss will not automatically erase your W-2 income or business profits.
Landlords who actively participate in managing the rental can deduct up to $25,000 of rental losses against non-passive income each year.7Office of the Law Revision Counsel. 26 US Code 469 – Passive Activity Losses and Credits Limited That allowance phases out as modified AGI climbs above $100,000 and disappears at $150,000.8Internal Revenue Service. Instructions for Form 8582 (2025) Married filing separately gets half those limits.
Losses you can’t use in the year of change aren’t lost. They suspend and carry forward, offsetting passive income in future years or releasing when you sell the property in a fully taxable disposition. Real estate professionals who meet the IRS’s material participation and hour tests are exempt from the passive activity limits and can deduct the full loss against any income.
What Happens When You Sell
Every dollar of depreciation you claim, or were entitled to claim, gets taxed at sale as unrecaptured Section 1250 gain, at a maximum federal rate of 25%.9Internal Revenue Service. Topic No. 409, Capital Gains and Losses Because the allowed-or-allowable rule already reduced your basis, catching up your missed deductions before selling does not raise your recapture tax.2Office of the Law Revision Counsel. 26 USC 1016 – Adjustments to Basis The only variable is whether you actually got the deductions along the way.
If a sale is on the horizon, filing Form 3115 first is especially worth doing. The catch-up deduction lands in the year of the method change, while recapture hits in the year of sale, and those often occur at different income levels. A 1031 like-kind exchange can also defer the recapture entirely by rolling proceeds into a replacement property.