Form 3115: Changing Depreciation Methods for Rental Property

Depreciation deductions are a cornerstone of rental property ownership — they reduce taxable income and protect cash flow. But landlords frequently use the wrong depreciation method, miss years of deductions, or want to switch to a more favorable approach. The Form 3115 allows you to change or correct your depreciation method, but it triggers a Section 481(a) adjustment that can create a substantial one-time tax bill or benefit depending on which direction you’re moving.

Why landlords file Form 3115

A common scenario: You bought a rental house in 2015 and depreciated the building over 27.5 years using the straight-line method. In 2023, you realize you should have been claiming bonus depreciation in years 2015-2017 (when it was 100% under the Tax Cuts and Jobs Act), and you missed out on thousands of dollars in deductions. Or, you’ve been using the wrong useful life for a component (the roof, HVAC, or windows) and want to correct it.

Form 3115 is the formal application to the IRS to change or correct your accounting method. For depreciation specifically, this includes changes to:

• The depreciation method (straight-line, accelerated, units-of-production, etc.)
• The asset’s useful life (recovery period)
• The asset’s basis or cost allocation
• The decision to use bonus depreciation or Section 179 expensing

The Section 481(a) adjustment explained

The heart of Form 3115 is the Section 481(a) adjustment — a one-time reconciliation of the cumulative difference between what you’ve deducted under the old method and what you should have deducted under the new method.

Example: Your rental property cost $400,000, with $100,000 allocated to the land (not depreciable) and $300,000 to the building. Under your original (incorrect) method, you claimed $5,000 annually for 8 years, totaling $40,000. Under the correct straight-line method over 27.5 years, you should have claimed $10,909 annually for the same 8 years, totaling $87,272. The Section 481(a) adjustment is $87,272 − $40,000 = $47,272.

If the adjustment is positive (you underdepreciated), it increases your taxable income in the year you file Form 3115. If the adjustment is negative (you overdepreciated), it reduces taxable income.

Positive vs. negative adjustments and spreading

If your Section 481(a) adjustment is negative — meaning you’ve been over-deducting and now must recapture — the adjustment is included in income all in the year of change. This triggers a recapture tax at ordinary income tax rates (up to 25% for unrecaptured Section 1250 gains on real property).

If your Section 481(a) adjustment is positive — meaning you’ve been under-deducting and now get to catch up — the IRS allows you to spread the positive adjustment ratably over four tax years (25% per year) to reduce the tax hit in the filing year. This is not optional; the spreading is automatic for positive adjustments.

In the example above, the positive $47,272 adjustment would be claimed as $11,818 in the filing year and each of the next three years.

Voluntary vs. automatic filing

Most depreciation method changes require IRS consent via Form 3115, filed with your 1040. You request automatic approval under Revenue Procedure 2019-43 (or the current applicable procedure), which the IRS grants without examination in most cases.

However, certain changes — such as correcting a depreciation error from many years ago or changing methods for a large portfolio of properties — may be challenged if the adjustment is substantial or if you lack documentation.

Timing and documentation

Form 3115 is filed with your 1040 for the tax year in which the change is effective. The change generally takes effect on the first day of that tax year, meaning you apply the new method going forward and report the Section 481(a) adjustment.

Before filing, gather:

• Original property acquisition documents (deed, closing statement, invoice for improvements).
• Depreciation schedules from prior years (Schedule C, Schedule E, or your tax preparer’s records).
• A recalculation showing what depreciation should have been claimed under the correct method.
• Evidence of the error (prior tax return showing the incorrect method, or a note indicating you followed an incorrect interpretation of tax law).

Common scenarios

Missing bonus depreciation: You bought equipment or made a capital improvement in 2022 but didn’t claim 100% bonus depreciation. File Form 3115 to claim it retroactively, with a positive adjustment that spreads over four years.

Wrong component life: You depreciated the entire building over 27.5 years, but should have separately depreciated the roof (15 years), HVAC (7 years), and flooring (5 years). File Form 3115 to segregate costs and apply the correct lives going forward, with an adjustment for the cumulative difference.

Wrong basis allocation: The purchase price included both real property and business equipment or leasehold improvements, but you incorrectly allocated all of it to the building. File Form 3115 to correct the allocation, triggering an adjustment.

Who files and penalties

You, the property owner, file Form 3115 with your personal 1040 through your tax preparer or directly with the IRS. If you own multiple rental properties, you can file a single Form 3115 covering all of them, or separate forms for different properties — usually one form per accounting method change.

Failure to file Form 3115 when required to change methods can result in penalties; conversely, if you file proactively to correct an error, the IRS is more likely to accept the adjustment without penalty.

Form 3115 and amended returns

If you’re correcting depreciation from a closed prior year (a year outside the statute of limitations), you may not be able to amend that return. Form 3115 allows you to correct the method prospectively without revisiting the closed year. However, if you are within the statute of limitations (typically 3 years), you can file an amended 1040-X for the incorrect year instead of using Form 3115.

See also