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Missed Depreciation in Past Years: Amended Return or Accounting-Method Change?

Short answer: It depends on what went wrong and how many returns it has been on. An amended return can fix depreciation only in certain cases. Examples are a mathematical error, a posting error, or property for which you have not yet adopted an accounting method. Once the same impermissible method has been used on two or more returns in a row, you have generally adopted it. The fix is then generally a change in accounting method on Form 3115, Application for Change in Accounting Method. That route has a real upside. With a section 481(a) adjustment, you can deduct depreciation you missed in earlier years in the year you make the change, without amending those years. Which route applies depends on your facts and is decided with your CPA.

Unless noted, the rules below come from IRS Publication 946 (2025).

What can "missed depreciation" look like?

An asset that never made it onto the depreciation schedule.
An asset depreciated with the wrong recovery period, method or convention.
Property treated as nondepreciable when it is depreciable, or the reverse.
The special depreciation allowance left unclaimed even though no election out of it was made.

The IRS treats these differently. So the first question is what happened, and on which returns.

When can an amended return correct depreciation?

You can file an amended return to correct the depreciation claimed for any property in these situations:

You claimed the wrong amount because of a mathematical error made in any year.
You claimed the wrong amount because of a posting error made in any year. Publication 225, the Farmer's Tax Guide, gives an example: omitting an asset from the depreciation schedule. If an asset was treated as not depreciable at all, rather than just left off the schedule, that is a change in accounting method instead (Treas. Reg. 1.446-1(e)(2)(ii)(d)(2)). Your CPA can tell which one applies.
You have not adopted a method of accounting for property you placed in service in tax years ending after December 29, 2003.
You claimed the wrong amount on property you placed in service in tax years ending before December 30, 2003.

If an amended return is allowed, file it by the later of two dates: 3 years from the date you filed the original return, or 2 years from the date you paid the tax. A return filed early counts as filed on its due date. Individuals amend on Form 1040-X, Amended U.S. Individual Income Tax Return.

What does it mean to have "adopted" a depreciation method?

You generally adopt a depreciation method in one of two ways. You use a permissible method on the first return you file. Or you use the same impermissible method on two or more returns filed in a row. Publication 225 says the same for farmers: "You have adopted a method of accounting if you used the same incorrect method of depreciation for two or more consecutively filed returns." There is an exception for property placed in service in the year just before the year you make the change. Rev. Proc. 2025-23 lets you use either Form 3115 or an amended return filed before your next year's return.

When is the fix an accounting-method change on Form 3115?

Generally, you need IRS approval to change your method of accounting. For depreciation, you generally ask for it on Form 3115. Examples of a change in method of accounting for depreciation include:

a change from an impermissible method, if that method was used on two or more returns in a row;
a change in how an asset is treated, from nondepreciable to depreciable, or the reverse;
a change in the depreciation method, recovery period or convention of an asset;
a change from not claiming to claiming the special depreciation allowance, if you did not elect out of it.

The IRS's About Form 3115 page sums up the form's purpose. It is used to request a change in either an overall method of accounting or the accounting treatment of any item.

Some depreciation fixes are not method changes

These changes are not a change in method of accounting. They may only be made on an amended return:

an adjustment in the useful life of an asset depreciated under section 167;
a change in use of an asset in the hands of the same taxpayer;
any change in an asset's placed-in-service date;
making a late depreciation election, or revoking a valid one. This generally needs IRS approval through a request for a letter ruling.

How is a depreciation method change filed?

Automatic or advance consent. If your change is on the IRS list of automatic changes, you may be able to use the automatic procedures in Rev. Proc. 2015-13. If not, you use the advance consent (non-automatic) procedures.
Change number 7 and Schedule E. The Instructions for Form 3115 list automatic change number 7: depreciation from an impermissible method to a permissible one. It uses Schedule E of Form 3115. The current list of automatic changes is Rev. Proc. 2025-23. The depreciation change is in section 6.01.
Filing. The form is attached to your return for the year of change, with a signed copy sent to the IRS. Your CPA handles the filing.

What is a section 481(a) adjustment?

If you file Form 3115 to change from an impermissible to a permissible depreciation method, you can make a section 481(a) adjustment. It picks up any unclaimed or excess allowable depreciation. The adjustment is the difference between the depreciation actually deducted and the total allowable before the year of change. The year of change is the first tax year you use the new method. If no depreciation was deducted, the adjustment is the total depreciation allowable before that year.

This is how missed depreciation gets caught up. A negative adjustment decreases taxable income. It is taken into account in the year of change, so you don't amend the earlier returns to claim it (IRC section 481(a); Rev. Proc. 2015-13, section 7.03). The adjustment counts depreciation from years that are already closed, too (Rev. Proc. 2015-13, section 2.06). A positive adjustment increases taxable income. It is generally spread over 4 tax years, and a one-year election is available in some cases. Whether your adjustment is negative or positive depends on your facts.

Why unclaimed depreciation still matters: "allowed or allowable"

You must reduce the basis of property by the depreciation allowed or allowable, whichever is greater. Depreciation allowed is what you actually deducted. Depreciation allowable is what you were entitled to deduct. In the publication's words: "If you do not claim depreciation you are entitled to deduct, you must still reduce the basis of the property by the full amount of depreciation allowable." Your asset records follow each asset to its sale. You need them to figure depreciation each year and the gain or loss when you sell (Publication 225).

Farm and ranch property worth checking

Publication 225 says you can depreciate most types of tangible property except land. Examples are buildings, machinery, equipment, vehicles and certain livestock. Its Table 7-1, Farm Property Recovery Periods, lists farm buildings, single-purpose agricultural structures, machinery and equipment, agricultural fences, grain bins, drainage facilities and breeding or dairy cattle. Land itself isn't depreciable. So when land and improvements were bought together, how the purchase was recorded shapes the depreciation for years.

Rental buildings and other real estate

The same rules apply to rental and business real estate, not just farm assets. Table 7-1 in Publication 225 lists residential rental property (27.5 years) and nonresidential real property (39 years). Publication 946 treats a change in an asset's recovery period or method, or a change from not depreciating an asset to depreciating it, as a change in accounting method. That comes up when a rental or commercial building has been depreciated as one asset for years and a cost segregation study later sorts parts of it into shorter recovery periods. For property already on two or more returns, that kind of change is generally made on Form 3115, not an amended return. Whether a study makes sense, and how any change is filed, depends on your facts and is decided with your CPA.

Publication 527, the IRS guide to residential rental property, points rental owners to the same two routes. Use an amended return where one is allowed. Otherwise, change your accounting method to claim the correct amount. The automatic change in Rev. Proc. 2025-23, section 6.01, covers moving parts of a rental or nonresidential building into a shorter-lived asset class. One limit is specific to rentals. Rental real estate is generally a passive activity, so a rental loss may not be deductible right away (Publication 527).

What to have ready

The depreciation reports for the years in question: Form 4562 and the detailed asset list behind it.
The earliest return on which each asset in question appears, if you have it.
Purchase records: invoices, bills of sale and real estate closing statements (Publication 225 lists these as examples of asset records).
Placed-in-service dates, how each asset is used, and any sales, trades or retirements.

Where DeepYield fits

DeepYield is a second set of eyes, not a replacement for your CPA. We go looking for what's missing. In a free two-year look-back, we do a review of your last two years of returns, done for you, including the depreciation schedules behind them. We check for assets that aren't on the schedule, the recovery periods and methods used, and how land, building and equipment purchases were recorded, on the farm or on rental and business real estate. We look for every legitimate deduction and credit you qualify for, not just the obvious ones. If something raises a question, we share it with you and your CPA. You and your CPA decide whether anything should change and which route fits.

Request your free two-year look-back →

Frequently asked questions

Can I fix missed depreciation with an amended return?

Only in certain situations: a mathematical or posting error, property for which you haven't adopted an accounting method, or property placed in service in tax years ending before December 30, 2003 (IRS Publication 946). If the same impermissible method was used on two or more returns in a row, the fix is generally an accounting-method change on Form 3115 instead.

What is Form 3115?

Form 3115, Application for Change in Accounting Method, is used to request a change in either an overall method of accounting or the accounting treatment of any item. IRS Publication 946 says you must generally file it to change your method of accounting for depreciation.

What does two or more consecutively filed returns mean for depreciation?

You generally adopt a depreciation method by using a permissible method on your first return, or by using the same impermissible method on two or more returns in a row (IRS Publication 946). Once a method is adopted, changing it generally takes IRS approval through Form 3115. There is an exception for property placed in service in the year just before the year you make the change. Rev. Proc. 2025-23 lets you use either Form 3115 or an amended return filed before your next year's return.

What is a section 481(a) adjustment for depreciation?

When you change from an impermissible to a permissible depreciation method on Form 3115, the section 481(a) adjustment is the difference between the depreciation actually deducted and the total allowable before the year of change. If no depreciation was deducted, it is the total allowable before that year. A negative adjustment is taken into account in the year of change, so missed depreciation is caught up without amending the earlier returns (IRS Publication 946; Rev. Proc. 2015-13).

If I never claimed depreciation, does it still reduce my basis?

Yes. Basis is reduced by depreciation allowed or allowable, whichever is greater. If you do not claim depreciation you are entitled to deduct, you must still reduce the basis by the full amount allowable (IRS Publication 946).

How long do I have to amend a return to correct depreciation?

I own rental property. Do the same rules apply?

Yes. The amended-return and Form 3115 rules in Publication 946 apply to rental and business property, not just farm assets. If a rental building was depreciated with the wrong recovery period or method on two or more returns, the fix is generally an accounting-method change on Form 3115. Your CPA decides which route fits.

Does DeepYield's look-back review depreciation?

Yes. The free two-year look-back is a review of your last two years of returns, done for you, including the depreciation schedules behind them. It's a second set of eyes, not a replacement for your CPA. Whether anything should change, and how, is decided with your CPA.

Sources

IRS Publication 946 (2025), How To Depreciate Property ("How Do You Correct Depreciation Deductions?": Filing an Amended Return; Adoption of accounting method defined; When to file; Changing Your Accounting Method; IRS approval; Section 481(a) adjustment; Basis adjustment for depreciation allowed or allowable): https://www.irs.gov/publications/p946
IRS Publication 527 (2025), Residential Rental Property (Claiming the Correct Amount of Depreciation; Passive Activity Limits): https://www.irs.gov/publications/p527
IRS Publication 225 (2025), Farmer's Tax Guide (ch. 7: What Property Can Be Depreciated?; How Do You Correct Depreciation Deductions?; Table 7-1 Farm Property Recovery Periods; ch. 1: Assets records): https://www.irs.gov/publications/p225
Rev. Proc. 2025-23, Internal Revenue Bulletin 2025-24 (List of Automatic Changes, section 6.01: impermissible to permissible method of accounting for depreciation, change number 7; 6.01(1)(b) 1-year depreciable property). Sections 7 and 19 were later modified by Rev. Proc. 2025-28 and Rev. Proc. 2026-32; section 6 was not: https://www.irs.gov/irb/2025-24_IRB
Rev. Proc. 2015-13, Internal Revenue Bulletin 2015-5 (automatic and advance consent procedures; section 2.05 no retroactive change; section 2.06 section 481(a) adjustment; section 7.03 adjustment periods): https://www.irs.gov/irb/2015-05_IRB
Treas. Reg. 1.446-1(e)(2)(ii)(d) (changes in depreciation that are, and are not, a change in method of accounting), eCFR: https://www.ecfr.gov/current/title-26/section-1.446-1
26 U.S.C. 481 (adjustments required by changes in method of accounting), Legal Information Institute: https://www.law.cornell.edu/uscode/text/26/481
About Form 3115, Application for Change in Accounting Method: https://www.irs.gov/forms-pubs/about-form-3115
Instructions for Form 3115 (Purpose of Form; Automatic change procedures; Year of Change; List of DCNs, no. 7): https://www.irs.gov/instructions/i3115
About Form 1040-X, Amended U.S. Individual Income Tax Return: https://www.irs.gov/forms-pubs/about-form-1040x

Results depend on your specific facts. No outcome is guaranteed. This is general information, not tax advice; advice is provided only under a signed engagement.

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