How 10-K Deadlines Work for Non-Calendar Fiscal Year Ends

Not every public company ends its fiscal year on December 31. Some issuers use a March 31, June 30, September 30, January 31, or other fiscal year-end that better matches their business cycle.

For these companies, the Form 10-K deadline is not tied to the calendar year. It is calculated from the company’s actual fiscal year-end and then adjusted based on SEC filer status. A non-calendar fiscal year does not create a separate SEC filing rule. It simply changes the date the company uses to count.

The 10-K deadline for a non-calendar fiscal year follows the same general framework used by calendar-year companies: 60 days, 75 days, or 90 days after fiscal year-end, depending on filer status.

The Basic 10-K Deadline Rule

Form 10-K is the annual report public companies file with the SEC. For a company with a non-calendar fiscal year, the filing deadline is counted from the last day of that fiscal year. A June 30 filer counts from June 30. A September 30 filer counts from September 30. A January 31 filer counts from January 31.

This means two companies with the same fiscal year-end may still have different Form 10-K due dates if they have different filer statuses.

Filer Status Comes First

Before calculating the 10-K due date for an off-cycle fiscal year-end, a company should confirm its SEC filer status. Filer status is generally based on public float, reporting history, and whether the company qualifies as a large accelerated filer, accelerated filer, or non-accelerated filer.

This step matters because filer status can change. A company should not automatically rely on last year’s deadline without checking whether its status still applies. Changes in public float, reporting history, or SEC classification can affect the annual reporting timeline.

Companies should also avoid confusing smaller reporting company status with filer status. Smaller reporting company status may allow scaled disclosure accommodations, but it does not automatically determine the Form 10-K deadline. The company still needs to confirm its Exchange Act filer status before relying on a filing date.

How to Calculate a Non-Calendar 10-K Deadline

To calculate the 10-K deadline for a non-calendar year-end, start with the company’s actual fiscal year-end date and apply the deadline period that matches its filer status.

A practical process is:

• Confirm the company’s fiscal year-end date.
• Verify the applicable SEC filer status.
• Count 60, 75, or 90 days after fiscal year-end.
• Check whether the date falls on a weekend or federal holiday.
• If needed, move the due date to the next business day.
• Build the filing calendar around the final due date.

The deadline is generally calculated using calendar days. However, if the calculated deadline falls on a Saturday, Sunday, or federal holiday, the filing due date generally moves to the next business day.

This is where off-cycle filers can make mistakes. Many SEC filing calendars focus on December 31 year-end companies. Those calendars may be useful for reference, but they should not be used as the primary deadline source for a company with a different fiscal year-end.

Example for an Off-Cycle Fiscal Year

The same 60-, 75-, and 90-day framework applies whether the fiscal year ends in January, March, June, September, or another month. The only difference is the starting date.

For example, if a large accelerated filer has a June 30, 2026 fiscal year-end, the company would generally count 60 days from June 30. Because the 60th day falls on Saturday, August 29, 2026, the Form 10-K due date would generally move to Monday, August 31, 2026.

An accelerated filer with the same June 30, 2026 fiscal year-end would generally have a September 14, 2026 deadline. A non-accelerated filer with that same year-end would generally have a September 28, 2026 deadline.

Companies should always verify their own filer status, weekends, federal holidays, and applicable SEC requirements before filing.

Does a Non-Calendar Fiscal Year Change the Filing Requirement?

No. A non-calendar fiscal year does not change what Form 10-K is designed to cover. The company still files an annual report for its completed fiscal year and must include the required SEC disclosures for that period.

What changes is the timing. A company with a September 30 fiscal year-end should not use a December 31 filing calendar as its deadline guide. Its annual report deadline is based on September 30.

The same concept applies to Form 10-Q filings. Quarterly report deadlines are based on the company’s fiscal quarter-end dates, not standard calendar quarters.

For this reason, companies with off-cycle fiscal years should maintain a company-specific SEC reporting calendar that reflects their actual reporting cycle.

Planning for EDGAR, XBRL, and Final Review

Calculating the deadline is only the first step. A Form 10-K filing also requires audit coordination, legal review, financial statement preparation, exhibit management, officer certifications, EDGAR formatting, Inline XBRL tagging, validation, proofing, and final submission.

Companies should avoid waiting until the deadline date to begin technical filing work. Last-minute issues can include missing signatures, broken exhibit links, EDGAR access problems, XBRL validation errors, late audit comments, formatting changes, or final management revisions.

A strong internal timeline should work backward from the actual Form 10-K due date. Key milestones should include audit completion, MD&A review, risk factor updates, exhibit collection, XBRL tagging, EDGAR conversion, management approval, audit committee review, and final filing authorization.

What If the Company Cannot File on Time?

If a company cannot file Form 10-K by the original deadline, it may be able to file Form 12b-25, also known as a Notification of Late Filing.

For Form 10-K, a timely and properly filed Form 12b-25 generally provides a 15-calendar-day extension. The notice is generally due no later than one business day after the original Form 10-K deadline.

However, Form 12b-25 should not be treated as routine flexibility. The company must explain why the annual report could not be filed on time, and any delays related to audit issues, accounting matters, internal controls, or liquidity concerns may receive close attention.

Calculation Mistakes to Avoid

Common mistakes include using a December 31 SEC filing calendar for an off-cycle fiscal year, relying on outdated filer status, assuming smaller reporting company status controls the deadline, forgetting weekend or holiday adjustments, waiting too long to begin EDGAR or XBRL work, and treating Form 12b-25 as a planning tool.

The safest approach is to calculate the filing date early, confirm the company’s filer status, and build a realistic reporting schedule around the actual fiscal year-end.

Get Help With Your Non-Calendar Form 10-K Filing

Colonial Filings helps public companies manage Form 10-K preparation, EDGAR formatting, Inline XBRL tagging, exhibit handling, filing review, and final SEC submission. If your company has a non-calendar fiscal year-end, our team can help calculate the applicable timeline and support the filing process from preparation through submission.