Do I have to amend all the prior returns?
Not for a qualifying accounting method change. Form 3115 can use a Section 481(a) adjustment in the year of change. Other errors may require amended returns or a different procedure.
How far back can the catch-up reach?
The calculation may include cumulative depreciation differences from the property’s earlier years of service. It is not simply limited to the usual amended-return refund window, but the change must qualify under the applicable rules.
Does a one-year error always need Form 3115?
No. A first-year issue may be corrected through an amended return, while some method changes have special rules. We review the actual error and timing before recommending a route.
Can you combine a cost segregation study with the correction?
Yes, where applicable. We scope the study, reconstruction, Form 3115 and return work together so the report and depreciation schedule agree.
Do I need a separate form for every property?
Not necessarily. The applicant and the type of change govern the filing. Some properties can be included together; separate entities or changes may require separate work.
Which bonus depreciation rate applies in a lookback?
The original acquisition and placed-in-service rules, asset eligibility and elections determine the treatment. A later study does not automatically entitle every old asset to today’s rate.
What happens when the property is sold?
Depreciation affects adjusted basis and can create recapture or other tax consequences on sale. We consider holding plans alongside the current adjustment, rather than assuming the deduction is a permanent saving.