What Is a Fiscal Tax Year End Date? Eligibility, Elections, Deadlines

A fiscal tax year end date is the last day of a 12-month accounting period that closes on the final day of any month other than December. It’s the alternative to a calendar year, which always ends December 31. Whichever you use, the date anchors everything else: when your return is due, when estimated payments come in, and how income and deductions land in one year versus the next.¹

The catch is that not everyone can choose one. Your entity type decides whether a fiscal year is available to you at all, and if it is, which month-ends you can pick.

Who Can Use a Fiscal Year

The freedom to pick a fiscal year end depends almost entirely on how your business is structured. Congress tightened the rules for pass-through entities because a mismatched year-end can let owners defer income for close to a full year. Entities taxed on their own income face far fewer constraints.

C Corporations

C corporations have the widest latitude. A C corporation can adopt any calendar or fiscal year that matches the books it actually keeps. No special IRS approval is needed beyond filing the first return on that basis.

Personal Service Corporations

A personal service corporation is a C corporation whose principal activity is providing services in fields such as health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting, with employee-owners doing a substantial share of the work. These corporations must use a calendar year unless they can show a business purpose for a different year-end or make a Section 444 election.²

Partnerships

Partnerships have to align their year-end with their owners’ through a hierarchy of tests. If partners who together own more than 50 percent of profits and capital all share the same tax year, the partnership uses that year. If no year meets that majority-interest threshold, the partnership uses the year shared by all principal partners (those with a 5 percent or greater interest). If neither test produces a single year, the partnership defaults to whichever year-end results in the smallest total deferral of income to its partners.³

A partnership can escape that outcome only by proving a business purpose to the IRS or by making a Section 444 election.

S Corporations

S corporations default to a calendar year. The statute calls this the “permitted year,” meaning December 31 or any other year for which the corporation proves a business purpose. Income deferral by itself is not a valid business purpose.⁴ Section 444 is the other route in.

Sole Proprietorships and Single-Member LLCs

A sole proprietorship or single-member LLC treated as a disregarded entity uses the same tax year as its owner. Since most individuals are on a calendar year, these businesses almost always end December 31. They can’t elect a separate fiscal year because the IRS doesn’t treat them as separate taxpayers.⁵

Trusts are similarly boxed in: most trusts must use the calendar year. Estates are the exception and can pick any fiscal year ending within 12 months of the date of death.⁶

The Section 444 Election

Partnerships, S corporations, and personal service corporations that want a fiscal year without meeting the business-purpose test have a fallback. Section 444 lets the entity pick a year-end that creates no more than three months of income deferral compared to its required year. If the required year is the calendar year, that means a September 30, October 31, or November 30 year-end.⁷

The price is a required payment that offsets the deferral. Partnerships and S corporations making the election file Form 8752 and pay an amount tied to the entity’s net income and the highest individual rate plus one percentage point.⁸ Missing the deadline triggers a penalty of 10 percent of the underpayment.⁹

The election also terminates if the entity becomes part of a tiered ownership structure, and no new election can be made after that.⁷

Picking the Actual Date

Your tax year has to match the accounting period you actually use for your books. You can’t keep records on a calendar-year basis and then file a fiscal-year return. Whatever year-end you use on your first federal return is the one you’re bound to going forward.⁵

The most common reason to pick a specific month-end is to line up with a natural business year — the point in the year when activity is at its lowest. Closing the books during a slow stretch means fewer transactions to cut off and simpler inventory counts. A ski resort might pick September 30 for exactly that reason.

The 25-Percent Gross Receipts Test

The IRS uses a mechanical test to decide whether a proposed year-end qualifies as a natural business year. Divide the gross receipts from the last two months of the proposed 12-month period by total gross receipts for the full 12 months. If the result is 25 percent or more, those two months represent a peak, and the month right after them qualifies. The test has to hit 25 percent or more for the most recent 12-month period and each of the two preceding 12-month periods.¹⁰

One more constraint: if a different year-end produces a higher average across those three periods, the IRS will not accept your proposal. The year-end with the highest concentration of receipts wins.¹⁰

The 52/53-Week Variant

Some businesses, particularly large retailers and manufacturers, prefer a year that always ends on the same day of the week rather than the same calendar date. The tax code allows a 52/53-week year for taxpayers who keep their books that way. The year always ends on the same weekday, either the last occurrence of that weekday in a given month or the occurrence closest to the month’s end.¹¹

Because the year is measured in whole weeks, it contains 364 or 371 days depending on how the calendar falls. A company that always closes on the last Saturday in January will have 53 weeks in some years and 52 in others.

Filing Deadlines Tied to Your Year-End

Your fiscal tax year end date sets the clock for your return. The deadlines run by entity type:

C corporations file by the 15th day of the fourth month after the fiscal year ends. A March 31 year-end means a July 15 filing date. Corporations with a June 30 year-end are the exception, filing by the 15th day of the third month (September 15).¹²
Partnerships and S corporations file by the 15th day of the third month after the year ends. A December 31 year-end means March 15; June 30 means September 15.¹³
Individuals file April 15. Individuals use the calendar year.¹³

Weekend or legal-holiday due dates shift to the next business day. Any of these entities can request an automatic six-month extension by filing Form 7004 before the original due date, but the extension only extends time to file, not time to pay.¹⁴

Changing Your Fiscal Year End

Once you’ve established a tax year on your first return, switching to a different one requires IRS approval on Form 1128.¹⁵

Certain changes qualify for automatic approval under published IRS revenue procedures. A C corporation moving to a calendar year, for example, can often get automatic approval without paying a user fee, as long as it meets the conditions in the applicable procedure. Form 1128 still has to go in by the due date of the short-period return the change creates.

Changes that don’t qualify for automatic approval require a private letter ruling. You file Form 1128 with a detailed business-purpose explanation, pay a $1,500 user fee, and wait — the process takes months.¹⁶

Every year-end change creates a gap between the old and new year-ends, and you have to file a short-period return covering those months. The tax on that period isn’t just the tax on the income that fell inside it. You annualize: multiply short-period taxable income by 12, divide by the number of months in the short period, compute the tax on the annualized figure, then prorate it back. The mechanism keeps taxpayers from landing in an artificially low bracket just because the reporting window was shorter than a year.¹⁷

1
GovInfo. 26 USC 441 – Period for Computation of Taxable Income
2
eCFR. 26 CFR 1.441-3 – Taxable Year of a Personal Service Corporation
3
Office of the Law Revision Counsel. 26 USC 706 – Taxable Years of Partner and Partnership
4
Office of the Law Revision Counsel. 26 USC 1378 – Taxable Year of S Corporation
5
Internal Revenue Service. Publication 538, Accounting Periods and Methods
6
Office of the Law Revision Counsel. 26 USC 644 – Taxable Year of Trusts
7
Office of the Law Revision Counsel. 26 USC 444 – Election of Taxable Year Other Than Required Taxable Year
8
Office of the Law Revision Counsel. 26 USC 7519 – Required Payments for Entities Electing Not to Have Required Taxable Year
9
Internal Revenue Service. Instructions for Form 8752
10
Internal Revenue Service. Internal Revenue Bulletin 2006-45, Revenue Procedure 2006-46
11
eCFR. 26 CFR 1.441-2 – Election of Taxable Year Consisting of 52-53 Weeks
12
Internal Revenue Service. Starting or Ending a Business
13
Office of the Law Revision Counsel. 26 USC 6072 – Time for Filing Income Tax Returns
14
Internal Revenue Service. About Form 7004, Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns
15
Internal Revenue Service. About Form 1128, Application to Adopt, Change or Retain a Tax Year
16
Internal Revenue Service. Schedule of IRS User Fees
17
Office of the Law Revision Counsel. 26 USC 443 – Returns for a Period of Less Than 12 Months