Changing your fiscal year end for tax purposes requires advance IRS approval on Form 1128, and most businesses can get that approval automatically if they meet the eligibility rules for their entity type. Those who don’t qualify can still request permission through a private letter ruling, which carries a $5,750 user fee as of 2026 and a much longer wait.1Internal Revenue Service. Internal Revenue Bulletin 2026-1 The federal filing is only the start. A year-end change also creates a short tax year, forces state notifications, affects employee benefit plans, and, for public companies, triggers SEC disclosure.
Do You Qualify for Automatic IRS Approval
The automatic approval process is faster, cheaper, and doesn’t require the IRS to issue an individual ruling. Whether you can use it depends on how your business is organized.
C Corporations
A C corporation generally qualifies for automatic approval if it hasn’t changed its fiscal year within the 48-month period ending with the last month of the requested new tax year.2Reginfo.gov. Rev. Proc. 2006-46 Certain prior changes are excused from that restriction, including a change made to match a new majority shareholder’s tax year, one required by consolidated return rules, or a switch between a 52-53-week year and a standard year ending in the same calendar month.
S Corporations, Partnerships, and Personal Service Corporations
Pass-through entities face tighter rules. They generally must use a “required tax year,” which for S corporations and PSCs is usually the calendar year, and for partnerships is the tax year of the majority partners. To take a different fiscal year under automatic approval, the entity must establish a “natural business year” by passing a 25-percent gross receipts test: in each of the three most recent 12-month periods ending with the proposed year-end month, at least 25 percent of gross receipts must fall in the last two months.3Internal Revenue Service. Rev. Proc. 2002-38 Running the test requires 47 months of gross receipts history.
When Automatic Approval Isn’t Available
Even a qualifying entity type can be shut out of automatic approval in certain situations, including being under IRS examination or holding an interest in certain pass-through entities with mismatched tax years. Businesses in those situations must request a private letter ruling and pay the $5,750 user fee.1Internal Revenue Service. Internal Revenue Bulletin 2026-1
The Section 444 Alternative for Pass-Throughs
A pass-through entity that can’t establish a natural business year has one more option. Under Section 444, an S corporation, partnership, or PSC can elect a fiscal year that produces no more than three months of tax deferral compared to its required year.3Internal Revenue Service. Rev. Proc. 2002-38 The election is made on Form 8716, not Form 1128.
The cost is ongoing. Partnerships and S corporations making a Section 444 election must make annual “required payments” under IRC Section 7519 that approximate the deferral benefit their owners receive. Personal service corporations are subject to minimum distribution requirements under IRC Section 280H, meaning they must pay out enough compensation to employee-owners to preserve certain deductions. For many entities, those recurring obligations wipe out the benefit of keeping a non-calendar year.
Filing Form 1128
Form 1128, Application to Adopt, Change, or Retain a Tax Year, is the formal application whether you’re seeking automatic approval or a ruling.4Internal Revenue Service. About Form 1128, Application to Adopt, Change or Retain a Tax Year It asks for identifying information, the current year-end, the proposed year-end, and the start and end dates of the short period that bridges them.
For automatic approval, the filing deadline is the due date (including extensions) of the return for the short period the change creates.5Internal Revenue Service. Instructions for Form 1128 Miss it and the automatic route is gone. Some entities have to include additional documentation:
- S corporations and PSCs attach a statement listing each shareholder’s name, tax year, ownership percentage, and income received from the entity during the preceding year and the short period.
- Partnerships attach a 47-month schedule of gross receipts to support the natural business year test.3Internal Revenue Service. Rev. Proc. 2002-38
Automatic approval requests carry no user fee. The applicant must cite the specific revenue procedure that authorizes the change on the form itself.
The Short Tax Year the Change Creates
Every fiscal year change produces a short tax year, an accounting period of less than 12 months connecting the old year-end to the new one. It requires its own federal return and its own calculations.
The Short-Period Return
File a separate federal income tax return covering the short period, reporting income earned and deductions incurred during that window.6eCFR. 26 CFR 1.443-1 – Returns for Periods of Less Than 12 Months It’s due by the 15th day of the third or fourth month after the short period ends, following the same due-date rules that would apply to a regular annual return for your entity type.
Annualizing Income
For C corporations, short-period taxable income must be annualized. Multiply the short-period income by 12, then divide by the number of months in the short period, compute the tax on that annualized figure, and prorate that tax back down by multiplying it by the fraction of the year the short period covers.7Office of the Law Revision Counsel. 26 USC 443 – Returns for a Period of Less Than 12 Months The rule keeps compressed income from being taxed at an artificially low effective rate.
An alternative computation is available and sometimes produces a lower bill. If you can establish your actual taxable income for the full 12-month period beginning on the first day of the short period, you can ask the IRS to compute your tax based on that real figure. The IRS uses whichever method produces the greater tax between this 12-month computation and the straight short-period income without annualization. You file the initial return using annualization and apply for the alternative calculation separately.
Estimated Tax
No estimated tax payments are required if the short year runs fewer than four full calendar months, or if the tax shown on the short-period return is less than $500.8eCFR. 26 CFR 1.6655-5 – Short Taxable Year For short years of four months or longer, estimated payments follow the standard installment schedule, except the first installment can’t be due before the 15th day of the fourth month of the short year.
Depreciation
Depreciation for the short period is prorated based on the number of months in the short year. Only the months within the short period count toward the MACRS calculation for that year, and going forward all depreciation schedules reset to the new fiscal year. Amortization of intangibles and other time-based deductions follow the same proration principle.
Get the Change Authorized Internally First
Before anything goes to the IRS, look at your charter, bylaws, and any operating agreement. Most corporate bylaws either specify the fiscal year-end or give the board authority to set it. Changing the year typically requires a board resolution, and if the bylaws hardcode a specific date, an amendment to the bylaws as well. Shareholder approval is uncommon but occasionally required.
The board resolution should record the business rationale, the old and new year-end dates, and authorization for officers to file the necessary federal and state paperwork. Keep it in the corporate minute book. The IRS or a state agency may ask for evidence that the change was properly authorized.
Notify the States
Most states use the federal tax year definition, but they don’t learn about your change from the IRS. You generally have to notify each state where you file, either by attaching a statement to the first state return under the new fiscal year or by submitting a state-specific application. A short-period state return typically mirrors the federal one.
Some states also require you to amend business registration documents or articles of incorporation if the fiscal year is stated there. Amendment fees generally run between $25 and $100. The larger risk is silence: a revenue department that doesn’t know about the change will keep expecting a return on the old schedule, and notices, penalties, and interest can pile up before anyone notices.
Employee Benefit Plans
If a retirement, health, or other benefit plan uses the same plan year as your fiscal year, the change creates a short plan year for that plan too. Plans subject to Form 5500 reporting (generally those with 100 or more participants) must file a short plan year return, checking the box on Part I, Line B of Form 5500. That return is due seven months after the short plan year ends.
A short plan year can also affect contribution limits, nondiscrimination testing, and vesting. Defined contribution plans may need to prorate the annual addition limit. Nondiscrimination testing becomes harder when the measurement period isn’t a full 12 months. If the plan document ties the plan year to the employer’s fiscal year, amend the plan document before the new plan year begins.
SEC Disclosure for Public Companies
When a publicly traded company changes its fiscal year through a board decision rather than a shareholder vote or charter amendment, it must disclose the change on Form 8-K under Item 5.03, including the date of the decision, the new fiscal year-end date, and the SEC form that will cover the transition period.9SEC.gov. Form 8-K The transition report itself is filed on Form 10-K or 10-KT. Because the transition period’s financial statements won’t be directly comparable to prior annual filings, companies often issue supplemental pro-forma disclosures.
Penalties for Missing the Short-Period Return
The short-period return is easy to overlook. It’s a one-time filing that doesn’t fit the normal annual rhythm, and the deadline often falls during a slow stretch of the business calendar.
The standard failure-to-file penalty under IRC Section 6651 applies: 5 percent of the unpaid tax for each month or partial month the return is late, capped at 25 percent. If the return is more than 60 days late, the minimum penalty is the lesser of $510 (for returns due after December 31, 2024) or 100 percent of the tax due.10Internal Revenue Service. Information About Your Notice, Penalty and Interest A separate failure-to-pay penalty of 0.5 percent per month accrues on any unpaid balance, and interest compounds daily from the original due date.
If Form 1128 itself is also late or missing, the IRS may refuse to recognize the change altogether, requiring you to file as if the old year-end were still in effect. Calendar the short-period return deadline as aggressively as any regular filing.