Form 1128 is the IRS (Internal Revenue Service) application used to adopt, change, or retain an annual accounting period. It is governed by Internal Revenue Code (IRC) Section 442. Businesses file it for tax planning reasons, such as aligning the tax year with a business cycle or a parent company’s fiscal year.
IRC Section 442 exists precisely to let a taxpayer change accounting periods with IRS consent when a real business reason supports it. See the IRS About Form 1128 page and the Instructions for Form 1128 for the primary rules.
What is Form 1128 (Application to Adopt, Change, or Retain a Tax Year)?
Form 1128, titled “Application to Adopt, Change, or Retain a Tax Year,” is the IRS form that requests consent to set or move an entity’s tax year under IRC Section 442. It covers three actions: adopt a first tax year, change an existing one, or retain a current year a rule would otherwise force you to drop.
The controlling statute is direct. IRC Section 442 states that a changed accounting period “shall become the taxpayer’s taxable year only if the change is approved by the Secretary,” per 26 U.S.C. §442 on Cornell LII. That is why a business reason, like matching a natural business cycle or a parent’s fiscal year, has to sit behind the request.
The form itself is old and stable. The current form is the Rev. October 2014 version (OMB No. 1545-0134, Cat. No. 21115C), per the current Form 1128 PDF. The IRS confirms “Recent developments: None at this time” on its About Form 1128 page, last reviewed 31 March 2026.
What is a tax year and how is it different from a fiscal year?
A tax year is the annual accounting period you use to figure taxable income. A fiscal year is a specific type of tax year that ends on the last day of any month other than December. A calendar year is the tax year ending December 31. Changing between them is what Form 1128 handles.
The definitions below come straight from IRC Section 441 and IRS Publication 538.
| Term | Definition | Source |
|---|---|---|
| Annual accounting period | The annual period on which a taxpayer regularly keeps books | IRC §441(c), govinfo |
| Calendar year | 12 months ending December 31 | IRC §441(d) |
| Fiscal year | 12 months ending on the last day of any month other than December | IRC §441(e) |
| 52-53 week year | An annual period that varies 52 to 53 weeks and always ends on the same weekday | IRC §441(f)(1) |
| Required tax year | A tax year mandated by the Code or Treasury Regulations | IRS Publication 538 |
| Short tax year | A tax year of less than 12 months, including when you change your accounting period | IRS Publication 538 |
Who needs to file Form 1128?
C corporations, individuals, partnerships, S corporations, personal service corporations (PSCs), trusts, estates, and tax-exempt organizations file Form 1128 when they adopt, change, or retain a tax year in circumstances that require IRS consent. Several situations need no Form 1128 at all, so check the exception before you file.
The Instructions for Form 1128 set out both the filers and the carve-outs.
| Situation | Form 1128 needed? | Source |
|---|---|---|
| C corporation changing its tax year | Yes, Part I and Part II or III | Instructions for Form 1128 |
| Partnership, S corp, or PSC making a §444 election | No, file Form 8716 instead | Instructions for Form 1128; IRC §444, Cornell LII |
| New entity adopting a permissible year on its first return | Often no Form 1128 required | Instructions for Form 1128 |
| Auto-approval rule that requires only a statement with the return | No separate Form 1128 | Instructions for Form 1128 |
| Terminating a prior §444 election | Yes, Form 1128 is required | Instructions for Form 1128 |
Why do businesses change their tax year?
Businesses change their tax year to match their natural business year, align with a foreign parent’s fiscal year, simplify consolidated reporting, or reflect a change in ownership or structure. The change must rest on a real business purpose, not a plan to defer income, which is the standard the IRS applies to every request.
Rev. Proc. 2002-39 anchors this test. It requires a facts-and-circumstances business-purpose showing and states plainly that “deferral of income to owners will not be treated as a business purpose,” per Rev. Proc. 2002-39. A natural business year, where most income clusters, is one of the strongest supporting facts.
Is IRS approval of Form 1128 automatic?
It depends on the track. Many tax year changes get automatic approval under a revenue procedure, filed on Part II with no user fee, when you meet the conditions. Everything else needs a non-automatic ruling request on Part III, with a user fee and a merits review. So approval is often automatic, correcting the common myth that it never is.
The controlling revenue procedures split by entity type and track.
| Revenue procedure | Who it covers | Track | Source |
|---|---|---|---|
| Rev. Proc. 2006-45 | Corporations other than S corporations | Automatic approval | Rev. Proc. 2006-45 |
| Rev. Proc. 2006-46 (as modified by Rev. Proc. 2007-64) | Partnerships, S corps, PSCs, certain trusts | Automatic approval | IRS Rev. Proc. 2006-46 |
| Rev. Proc. 2002-39 | Filers who fail an automatic-approval condition | Non-automatic ruling request | Rev. Proc. 2002-39 |
A corporation that complies with Rev. Proc. 2006-45 “will be deemed to have established a business purpose and obtained the approval of the Commissioner.” Automatic approval generally requires no tax year change in the prior 48 months. It also excludes filers under examination, before Appeals, or in litigation.
When do you need an IRS ruling request instead of automatic approval?
You need a ruling request when you fail any automatic-approval condition, such as a tax year change inside the 48-month lookback or an excluded status like being under examination. You then complete Part III and prove a substantial business purpose under Rev. Proc. 2002-39, which the IRS reviews on the merits.
The bar is high. The IRS says it “anticipates that a taxpayer will be granted permission” under this facts-and-circumstances test “only in rare and unusual circumstances,” per Rev. Proc. 2002-39. A user fee applies, set each year in the IRS’s first revenue procedure (Rev. Proc. 20XX-1), and it runs into the thousands of dollars. Confirm the current fee before filing.
How do you file Form 1128 to change your tax year?
Complete Part I first, then Part II for automatic approval or Part III for a ruling, and file by the applicable deadline. Automatic approval requests are filed with the short-period return; ruling requests go to the IRS National Office with the user fee. The table below maps each part against the current instructions.
| Form part | Who completes it | Key contents | Where and when filed |
|---|---|---|---|
| Part I | All applicants | Name, EIN, applicant type, present and requested tax year, short period, reason | Filed with the applicable return or ruling request |
| Part II | Automatic-approval filers | Rev. Proc. eligibility statements, prior-change history | With the short-period federal return; no user fee |
| Part III | Ruling-request filers | Business-purpose explanation, supporting facts, user fee | IRS National Office, per Instructions for Form 1128 |
Timing decides the outcome. Under Rev. Proc. 2006-45, Form 1128 must be filed no earlier than the day after the first effective year ends and no later than the due date, including extensions, of the return for that year. Missing this window can void automatic approval and push you to the ruling track.
What is a short tax year and how do you handle the short-period return?
A short tax year is a tax year of less than 12 months that bridges your old and new years when you change accounting periods. You must file a separate short-period return for that gap, and the timing of that return sets your Form 1128 deadline. IRS Publication 538 defines the short year and the annualization rules.
For corporations, the short-period return carries its own filing deadline and its own tax computation, and estimated tax during the transition year shifts with it. Because the automatic Form 1128 deadline tracks the short-period return’s due date, the two filings move together. Plan the short period before you file, not after.
How do you align a US tax year with the Indian fiscal year (April to March)?
A US subsidiary of an Indian parent files Form 1128 to move its US tax year to a fiscal year ending March 31, matching India’s April-to-March fiscal year. This gives one annual close instead of two, cleaner consolidation for the parent, and easier coordination of positions under the India-US Double Taxation Avoidance Agreement (DTAA). A Delaware C corporation is the cleanest case.
The mechanics reward planning, and one section of the Code can override your choice.
| Fact | Detail | Source |
|---|---|---|
| India fiscal year | April 1 to March 31 | India statutory financial year |
| Target US fiscal year end | March 31, filed via Form 1128 | Instructions for Form 1128 |
| C-corp filing deadline for March 31 FYE | 15th day of the 4th month, roughly July 15 | IRC §6072 |
| §898 required year | Specified foreign corporations must use the majority US shareholder year | IRC §898, govinfo |
| §898 ownership threshold | A US shareholder owns more than 50% of voting power or value | IRC §898(b) |
| One-month deferral repeal | Repealed for tax years beginning after November 30, 2025 | IRS Notice 2025-72 |
Two cautions matter. A foreign-owned single-member LLC (limited liability company) is often a disregarded entity whose year follows its owner, so the corporate Form 1128 path applies only if it has elected C-corp treatment. And IRC §898 can force a controlled foreign corporation (CFC) onto its majority US shareholder’s year, which needs CFC-side analysis before you assume a free March 31 election. Year-end alignment eases DTAA administration; it does not unlock treaty benefits you would otherwise lose.
What happens if you file Form 1128 late?
A late Form 1128 is generally rejected for automatic approval, but relief may be available under Treasury Regulation §301.9100-3 for late regulatory elections. That relief typically requires a private letter ruling, a showing of reasonable good faith, and a user fee, per the Instructions for Form 1128. There is no standalone Form 1128 penalty.
The real exposure comes from the underlying returns. If the change is denied or void, you keep filing on the old tax year, and any returns filed on the wrong year can draw late-filing or late-payment penalties. That is the risk to manage, not a fee on the form itself.
How Commenda helps with Form 1128 and tax year changes
Getting a tax year change right means matching the correct track, meeting the short-period deadline, and filing the right supporting statements the first time. Commenda’s corporate tax and bookkeeping platform handles US tax compliance filings like Form 1128 as part of your federal return preparation, with CPA review so elections and deadlines do not slip.
For Indian and other foreign-owned groups aligning a US subsidiary to a parent’s fiscal year, Commenda’s entity management keeps cross-border subsidiary compliance on one system, and the Commenda compliance calendar tracks every filing deadline by entity so a short-period return never surprises you.
Book a demo to map your tax year change and get every Form 1128 filing tracked: book a demo with Commenda.
