Look-back studies

You didn't miss the window. You've been missing the deduction.

Property bought in a prior year can still be studied. A look-back captures every dollar of depreciation you should have taken since the placed-in-service date and claims it as a single catch-up adjustment — on your current return, with no amendments.

Check a prior-year property Book a 15-minute call

Free estimate first. If the remaining basis doesn't justify the fee, we'll tell you.

Deal math

Medical office — bought 2019

Six years of missed depreciation caught up in one return

Purchase price: $2,400,000
Reclassified to short-life assets: $576,000
Year-one deduction: $576,000

Share of basis accelerated24%

5 / 7 / 15-year lives39 or 27.5-year remainder

Estimated tax savings

$213,120on $2.4M

Illustrative example. Actual results depend on your basis, placed-in-service date, and tax position.

How a look-back works

Verify at www.cssiservices.com

Amended returns required: NoAmended returns required
Where the entire catch-up is claimed: 1 returnWhere the entire catch-up is claimed
Placed-in-service years still routinely studied: 2000sPlaced-in-service years still routinely studied
Automatic change in accounting method: Form 3115Automatic change in accounting method

The mechanism

§481(a): the catch-up adjustment

When you change how an asset is depreciated, the IRS doesn't make you rewrite history. Form 3115 requests an automatic change in accounting method, and the difference between the depreciation you took and what you should have taken becomes a single §481(a) adjustment on the current year's return.

Step 1

Depreciation taken

What went on the return under a straight 27.5- or 39-year line since you bought it.

Step 2

Depreciation allowed

What the engineering study shows you were entitled to across 5-, 7-, 15-, and long-life components.

Step 3

The difference

Claimed in full on the current return as a §481(a) adjustment. One filing, no amendments.

Worth knowing: because the catch-up lands in a single year, a look-back often produces a larger one-time deduction than a study on a property you just bought. Whether that's useful depends on your income in the filing year — bring that to the call.

How it works

What a look-back engagement looks like

Send the history
Closing statement, the depreciation schedule as filed, and any records of improvements since purchase.
Study and reconstruct
Engineers classify the property as it should have been from the placed-in-service date forward, and quantify the gap.
Your CPA files Form 3115
You receive the study and the §481(a) detail. The catch-up is claimed on the current-year return.

Look-back questions

The timing objections, answered honestly.

I bought the property years ago. Isn’t it too late?

No. A look-back study catches up every dollar of depreciation you should have taken since the placed-in-service date, and claims it as a single §481(a) adjustment on your current return. No amended returns required.

How far back can I go?

There is no fixed cutoff tied to the statute of limitations for this change in accounting method — properties placed in service well over a decade ago are routinely studied. The practical limit is whether the remaining basis justifies the fee.

Do I have to amend prior returns?

No — that is precisely what Form 3115 avoids. The automatic change in accounting method puts the entire catch-up on one current-year return.

What if I’m planning to sell soon?

Then the timing question is real, and worth modeling first. A look-back can still make sense, but recapture at sale changes the arithmetic. Bring the disposition timeline to the call and we’ll be straight with you about whether it pencils.

Prior-year property

How much depreciation is sitting on your old acquisitions?

Send one property — purchase price, placed-in-service date, and what's on the schedule now. The estimate is free.