What Is IRS Form 3115 and How Do You File It?

IRS Form 3115, Application for Change in Accounting Method, is how you ask the IRS for permission to change the way you report income or deductions on your federal tax return.¹ You file it under one of two tracks: automatic consent, which you attach to a timely filed return with a duplicate copy sent to Ogden, Utah, or non-automatic consent, which goes to the IRS National Office during the year of change with a user fee. The track depends entirely on whether your specific change appears on the IRS’s published list of automatic changes, and getting that first decision wrong can push your change back by a full tax year.

When You Actually Need to File Form 3115

Federal law requires IRS consent before you switch accounting methods. Section 446(e) of the Internal Revenue Code says any taxpayer changing the method used to regularly compute income must get the Secretary’s approval before calculating taxable income under the new method.² Form 3115 is the mechanism, and the rule reaches every type of filer: individuals, C corporations, S corporations, and partnerships.³

A method change involves either your overall plan for reporting income and deductions or the treatment of a specific material item. The key word is timing. If you’ve been handling an item the same way for more than one tax year, that pattern is your established method, and switching requires Form 3115. Common changes include:

Moving from the cash method to the accrual method, or back
Changing inventory valuation, such as FIFO to LIFO
Switching from an incorrect depreciation method to the correct method under IRC Section 168⁴
Changing when you recognize revenue
Adjusting how you capitalize costs under Section 263A

Not every return change counts. Fixing a math error, a data-entry mistake, or a one-time computational error does not require Form 3115. The line is whether the issue involves the timing framework itself versus a mistake in applying it. One more boundary worth knowing: picking a method on your first return for a new business is an adoption, not a change, and no form is required. Form 3115 only enters the picture when you’re switching away from a method you’ve already been using.

Skipping the form when it’s required is costly. The IRS can discover an unauthorized change on audit and impose the switch on its own schedule, with accuracy-related penalties and interest on top of the extra tax. Filing voluntarily also brings a benefit most taxpayers underuse: audit protection. When the IRS grants your method change under automatic consent, it generally agrees not to challenge your old method for tax years before the year of change.³ That matters most when you’re correcting an impermissible method. Protection has limits though. If the item is already under examination, you generally need to fall within a three-month or 120-day window period to qualify.

Automatic vs. Non-Automatic Consent

The IRS runs two tracks for Form 3115, and your change belongs to one or the other based on a published list.

Automatic Consent

Most common method changes fall under automatic consent. The general procedures appear in Revenue Procedure 2015-13, and the current list of qualifying changes is in Revenue Procedure 2024-23.⁵ If your change is on the list, you don’t need to request a letter ruling. You file the form, implement the new method on the return for the year of change, and consent is granted automatically provided you meet every condition in the revenue procedure.

The list covers depreciation corrections for tangible property, capitalization changes under Sections 263 and 263A, inventory method changes, revenue recognition timing adjustments, and the capitalization and amortization of research and experimental expenditures under Section 174 (designated change number 265). Each change carries its own eligibility conditions, so “automatic” still means verifying no exclusion applies to you.

The deadline is simple: attach the completed Form 3115 to your timely filed federal income tax return, including extensions, for the year of change.⁶ No user fee applies.

Non-Automatic (Advance) Consent

Any change not on the automatic list requires advance consent. You file Form 3115 with the IRS National Office, pay a user fee, and wait for a letter ruling before implementing the new method.³

The deadline here is earlier than most people expect. You must file during the tax year for which you’re requesting the change.⁶ A calendar-year taxpayer wanting a method change for 2026 must get the form to the National Office before December 31, 2026. Narrow exceptions allow later filing in limited circumstances, but the default rule is during the year.

The user fee for a non-automatic request is $13,225 for submissions received after February 1, 2025.⁷ That alone is reason to check twice whether your change qualifies for the automatic list. Once you receive a favorable ruling letter, you attach a copy of the approved Form 3115 to the return for the year of change.

Calculating the Section 481(a) Adjustment

Every method change triggers a Section 481(a) adjustment. The point is to make sure no item of income or deduction gets counted twice or dropped entirely when you switch methods.⁸

You compare what your cumulative taxable income would have been under the new method against what you actually reported under the old method, measured as of the beginning of the year of change. The difference is your adjustment. For a cash-to-accrual switch, that typically captures accounts receivable that were earned but not yet collected and accounts payable that were incurred but not yet paid. The net is the adjustment.

A positive adjustment means the old method understated income or overstated deductions. You owe additional tax, but Revenue Procedure 2015-13 lets you spread a positive adjustment ratably over four tax years starting with the year of change.⁶ A $100,000 positive adjustment hits as $25,000 in each of four years. Certain automatic changes or letter rulings can specify a different period.

A negative adjustment means the old method overstated income or understated deductions. You take the entire benefit in the year of change.⁶ The asymmetry favors the taxpayer: bad news spreads over four years, good news arrives immediately.

Filling Out the Form

Before you open Form 3115, settle two things: which consent track applies, and the dollar amount of your Section 481(a) adjustment. With those in hand, the four parts of the form are manageable.

Every automatic change on the IRS list has a three-digit Designated Change Number, or DCN. You enter it on the form to link your filing to the specific eligibility rules for that change. DCN 265, for example, covers the required capitalization and amortization of research and experimental expenditures under Section 174.⁵ Non-automatic filings have no pre-assigned DCN.

Part I asks for standard identification: name, taxpayer identification number, address, entity type, and the tax year of the requested change. If you’re filing on behalf of a subsidiary or partnership, the filer and the applicant may be different entities, and both get identified here.

Part II asks whether you’ve filed Form 3115 before, whether the item has been under IRS examination, and whether any eligibility restriction applies. Answer carefully. A “yes” to certain questions can push you off the automatic track.

Part III asks you to describe the current (old) method and the proposed (new) method in substantive terms, not just code citations. For a depreciation change, that means identifying the affected assets, the recovery periods and conventions you’ve been using, and what you’re switching to. Vague descriptions are a common reason the IRS returns forms or asks for more information.

Part IV captures the Section 481(a) adjustment amount and the period over which it will be recognized: one year for a negative adjustment, four years for a positive one unless the specific change requires something different.

The form must be signed by someone with authority to bind the taxpayer: a corporate officer, a general partner, or the individual taxpayer. For automatic changes, attach a statement agreeing to all terms and conditions of the applicable revenue procedure.

Where and When to Send It

The submission logistics differ by track, and getting them wrong can invalidate an otherwise correct filing.

Automatic Consent

You submit two copies. The original attaches to your timely filed federal income tax return, including extensions, for the year of change.⁶ A signed duplicate goes to the IRS in Ogden, Utah, filed no earlier than the first day of the year of change and no later than the date you file the original.

The current mailing address for the Ogden copy is Internal Revenue Service, Ogden, UT 84201, Attn: M/S 6111. If you use a private delivery service, the street address is 1973 N. Rulon White Blvd., Ogden, UT 84201, Attn: M/S 6111.⁹ The IRS also currently accepts the duplicate copy by fax, a procedure introduced during COVID-19 that remains referenced on the IRS filing page.¹⁰ Check the IRS “Where to File Form 3115” page for the most current options before you send anything.

Non-Automatic Consent

You file one copy directly with the IRS National Office. The current address is Internal Revenue Service, Attn: CC:PA:LPD:TSS, P.O. Box 7604, Benjamin Franklin Station, Washington, DC 20044.³ Non-automatic requests can also go in by secure fax or encrypted email. Include the $13,225 user fee.⁷

Once a favorable letter ruling arrives, attach a copy of the approved Form 3115 to the tax return for the year of change. Keep proof of mailing or electronic submission for every copy you send. If a timing dispute ever arises, the burden is on you to show the filing was timely.

Small Taxpayer Shortcuts

If your business qualifies as a small taxpayer, two things work in your favor. Businesses with average annual gross receipts at or below the inflation-adjusted threshold for the three prior tax years are exempt from the Section 263A uniform capitalization rules, which eliminates one of the more common triggers for Form 3115. The base threshold is $25 million, adjusted each year. For 2026, confirm the current figure in the IRS inflation adjustment announcements.

Qualified small taxpayers also get a reduced Form 3115 filing for certain DCNs, completing only specified lines and schedules. The Form 3115 instructions identify which DCNs qualify, including changes tied to cash-method eligibility, depreciation, and inventory.³ The substance of the method change and the Section 481(a) adjustment stay the same. The paperwork drops significantly.

Common Mistakes That Delay or Invalidate Filings

The most frequent problem is filing under the wrong consent track. If your change requires non-automatic consent and you file as automatic, the IRS will reject it. You lose the year and may have to wait until the next one to start over. Verify your change against the current list in Revenue Procedure 2024-23 before assuming automatic treatment.⁵

Other recurring pitfalls:

Filing with the return but forgetting the Ogden duplicate. Both copies are required for automatic consent.
Vague descriptions in Part III. Writing “changed depreciation method” without identifying assets, recovery periods, and conventions invites a rejection or a request for more information.
Incorrect Section 481(a) math. If the adjustment is wrong, the IRS may recalculate it on less favorable terms. Double-check the cumulative difference between methods as of the first day of the year of change.
Filing during an active audit. If the IRS is already examining the item, eligibility rules tighten and you may need to fit within the three-month or 120-day windows to qualify.

Because the non-automatic user fee runs over $13,000 and letter rulings can take months, the stakes for getting the filing right the first time are real. For complex changes or large Section 481(a) adjustments, working with a tax professional who has Form 3115 experience is usually worth the cost.

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Internal Revenue Service. About Form 3115, Application for Change in Accounting Method
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Office of the Law Revision Counsel. 26 USC 446 General Rule for Methods of Accounting
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Internal Revenue Service. Instructions for Form 3115
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Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System
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Internal Revenue Service. Revenue Procedure 2024-23
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Internal Revenue Service. Revenue Procedure 2015-13
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Internal Revenue Service. Internal Revenue Bulletin 2025-1
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Office of the Law Revision Counsel. 26 U.S. Code 481 – Adjustments Required by Changes in Method of Accounting
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Internal Revenue Service. Where to File Form 3115
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Internal Revenue Service. Temporary Procedure to Fax Automatic Consent Forms 3115 Due to COVID-19