Does a Tax Return Extension Also Cover Form 3115 Filing?
A focused answer for business owners and rental-property owners.
The direct answer
For an eligible automatic change, the original Form 3115 is generally attached to the timely filed return for the year of change, including applicable extensions. The duplicate-copy procedure must also be satisfied under current instructions.
How to evaluate your situation
An extension does not eliminate eligibility conditions, signature requirements or separate filing steps. The preparer should identify whether the change is automatic or nonautomatic and check the applicable revenue procedure. For automatic procedures, the original and duplicate copies have specified timing and destinations. Use the current address or permitted submission method; do not assume an old address remains correct. Retain proof of the return filing and separate submission, with the complete adjustment computation. A draft form in the client folder is not evidence that either filing occurred. Review the process before the extended deadline so a missing signature or attachment does not undermine the correction.
Hypothetical example
A taxpayer extends the return and plans an eligible automatic depreciation change. The preparer checks both the return attachment and required duplicate submission. Filing the extension by itself does not mean the accounting-method change has been filed.
Records to gather
- Extension acceptance
- signed Form 3115
- eligibility review
- adjustment schedule
- return acceptance
- duplicate submission proof
Related question
Is attaching Form 3115 to the return always the only filing step?
No. Automatic changes generally involve a separate duplicate-copy submission under the instructions. Confirm the procedure for the particular change.
Source and next step
Updated September 30, 2026. This general federal tax discussion does not decide an individual filing position. Apply the current instructions for the actual tax year and your complete facts.
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