Can I change the class life of a depreciated asset after the fact?

Yes — IRC §168(e)(3) lets you elect a class life different from the GDS default by filing Form 3115 with the current-year return. The election is one-way per asset (you cannot revert after making it) and applies to all property in the same asset class placed in service that year.

What is the §481(a) catch-up adjustment?

§481(a) requires a cumulative catch-up — the difference between depreciation allowed under the new method and depreciation actually claimed under the old method, computed as if the new method had always been used. The full §481(a) adjustment hits in the year of the change, not ratably over the recovery period.

When do I file Form 3115 for a depreciation change?

File Form 3115 with the federal income tax return for the year of the change. Rev. Proc. 2015-20 / 2015-21 streamline eligible small-business changes to automatic-change procedures (no user fee, no ATSA filing), and Rev. Proc. 2024-XX codifies the latest eligibility thresholds — confirm in the current Form 3115 instructions before filing.

Can I switch from MACRS to ADS mid-year?

Yes — ADS is the alternative depreciation system under §168(g). The switch requires a Form 3115 change and a §481(a) catch-up. Electing ADS makes sense for assets with no public utility or tax-exempt use where the longer ADS life produces a better current-year tax result.

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Depreciation catch-up (Form 3115)

Form 3115: how to fix a depreciation class-life election

Change a prior MACRS class-life election on Form 3115, file with the current-year return, and book the §481(a) catch-up adjustment. The audit framing under Rev. Proc. 2015-20 / 2015-21 explained.

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Citation backbone

This article rests on the research reference below. Suggestions may include source context that the practitioner should inspect and verify.

IRC § 168 Form 3115 Instructions

Who can claim this

Who qualifies for the depreciation catch-up (form 3115)

Year-over-year anomaly on a prior return — missed MACRS class-life election claimed via the §481(a) catch-up.

Asset ledger shows class life elected in the current year (not the default ADS recovery period under §168(g)(2)).
Prior-year comparison return flags a > 20% depreciation variance on the same asset category — Rev. Proc. 2015-20 / 2015-21 audit framing.
Form 3115 is filed with the current-year return and a §481(a) adjustment for the cumulative catch-up.

How to claim — step-by-step

How to claim the depreciation catch-up (form 3115)on this year's return

Asset ledger shows class life elected in the current year (not the default ADS recovery period under §168(g)(2)).
.
Prior-year comparison return flags a > 20% depreciation variance on the same asset category — Rev.
Proc. 2015-20 / 2015-21 audit framing..
Form 3115 is filed with the current-year return and a §481(a) adjustment for the cumulative catch-up.
.

What catches practitioners off guard

The risk to review

Why AI + human review matters here

A §168 class-life election change via Form 3115 is a one-way-street for the asset — confirm with the client that they prefer the new class life before signing the §481(a) adjustment.

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FAQ

Common questions about the depreciation catch-up (form 3115)

Quick answers to the questions solo CPAs and enrolled agents ask us most often about this deduction.

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