Missed Depreciation on Rental Property: How to Catch It Up in One Year, Without Amending

By Laura Dohanes, CPA - September 11, 2026 

If you own a rental, there is a good chance you are sitting on a deduction you never claimed. Not a gray-area deduction. Depreciation you were entitled to, and never took.

Missed depreciation on rental property can be caught up in a single adjustment on this year's return. The tax code calls the mechanism a change in accounting method, filed on Form 3115, and the catch-up itself is a Section 481(a) adjustment. You do not go back and amend a single old filing. Someone runs a look-back cost segregation study on the property, the difference between what you should have claimed and what you actually claimed becomes one number, and that number lands on this year's return. There are two catches, and I will get to both, but that is the shape of it.

Where missed depreciation on rental property comes from

Earlier this week I wrote about how a short-term rental cost segregation study can produce a large deduction this year on a property you place in service before the year ends. That post was about a property you are buying now.

This one is about the property you already own. If you have been depreciating it the plain way, one number a year, the whole way through, you may have left real depreciation sitting on the table. The plain way is not wrong. It is just usually the smallest number the property can produce.

What is a Form 3115 change in accounting method?

It is the tax world's mechanism for fixing this. A change in accounting method lets you catch up everything you were entitled to and never took. In one adjustment. On this year's return. You do not have to go back and amend a single old filing.

The request goes to the IRS on Form 3115, Application for Change in Accounting Method, and it rides along with your regular return for the year. That could be very good news as you start thinking about deductions for this year, before it closes.

How does catch-up depreciation work in practice?

Someone runs a look-back cost segregation study on the property, going back to the year you placed it in service. The study identifies what should have been depreciated over 5, 7, or 15 years instead of on the building's long schedule.

Then the math is simple. What you should have claimed, minus what you actually claimed, becomes one adjustment on this year's return. All the missed years, caught up at once.

Do you get today's bonus depreciation rules on an old property?

No. This is the first catch. The catch-up runs on whatever depreciation rules were in effect the year you placed that property in service, not necessarily what is in effect now.

That is still often a number that can help. It just is not automatically this year's number, and anyone who tells you otherwise before looking at your placed-in-service date is guessing.

Where does the catch-up deduction land?

This is the second catch. The same passive rules from the short-term rental post decide where that deduction goes. On a rental that qualifies as a short-term rental, it can offset business or W-2 income. On a rental that sits passive, the catch-up sits passive with it. The deduction is real either way. Whether it cuts this year's tax bill depends on the property.

Not sure which side of that line your rental is on? Schedule a Free Tax Strategy Session and we will look at the property, the placed-in-service date, and what a look-back study could actually free up.

Does this apply if you already had a cost segregation study?

Yes. This applies whether you never had a study done at all, or you had one years ago that did not capture everything it could have. A study that missed components is a study that left depreciation behind, and a change in accounting method can pick it up.

Is catch-up depreciation a DIY project?

Again, no. This is not something to guess about, and it is not something to run through software and hope.

But if you have owned a rental long enough to have filed at least two returns depreciating it, and you have never asked whether the depreciation on it was ever actually right, that is a question to put in front of someone before the year closes, not after. That person could be me.

Strategy, my friends. Real estate is one I love. The gift that keeps on giving.

If you want to talk it through, book a time and we will look at your property together.

Disclaimer: This article is for general educational purposes only and does not constitute tax, legal, or accounting advice. Whether a change in accounting method is available, how much depreciation can be caught up, which bonus depreciation rules apply to your placed-in-service year, and whether the resulting deduction offsets your other income all depend on your specific facts and circumstances and change from year to year. Please consult a qualified tax professional before relying on anything discussed here.

Frequently Asked Questions

Can you claim missed depreciation on a rental property without amending prior returns?

Yes. Missed depreciation on a rental property is caught up through a change in accounting method, filed on Form 3115 with your current-year return. The difference between what you should have claimed and what you actually claimed becomes one Section 481(a) adjustment on this year's return. No amended returns are required.

How far back can catch-up depreciation go on a rental property?

Catch-up depreciation goes back to the year you placed the rental property in service. A look-back cost segregation study covers every year from that date forward, and all of the missed years are caught up in a single adjustment on this year's return.

Do you get 100% bonus depreciation on a rental property placed in service years ago?

Not automatically. A catch-up on an older rental property runs on the depreciation rules that were in effect the year the property was placed in service, not necessarily the rules in effect today. That is still often a helpful number, but it is not this year's number by default.

Does catch-up depreciation apply if the property already had a cost segregation study?

Yes. Catch-up depreciation applies whether a rental property never had a cost segregation study at all, or had one years ago that did not capture everything it could have. A change in accounting method can pick up what the earlier study left behind.

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Laura Dohanes, CPA

Laura Dohanes, CPA

Founder, My CPA Pro, P.C.  ·  California CPA License #129889  ·  Verify

Laura has spent more than two decades in the small business world as a tax strategist and fractional CFO, helping owners across the United States pay less tax and build lasting wealth. Her practice spans advanced tax planning, entity structuring, accounting, and CFO-level financial strategy, and she has represented more than 3,000 clients in federal and state tax audits. She also teaches financial literacy to young people, on the conviction that understanding money early changes what someone believes is possible.

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