Form 2553 Deadline: How to Work Out Your Exact Date

The rule is one sentence long. An S election takes effect for a tax year only if Form 2553 is filed no more than 2 months and 15 days after the start of that tax year, or at any time during the tax year immediately before it. Everything difficult about the deadline comes from two words in that sentence: tax year. It is not measured from the day the state stamped your formation certificate, not from the day your EIN arrived, and not from the day you started trading unless that day also started your tax year.

As of today, July 30, 2026, the calendar-year deadline for the 2026 tax year — Monday March 16, 2026 — has passed. The deadline for the 2027 tax year is Monday March 15, 2027, and the early-filing window for it is already open: a business that has a 2026 tax year can file today with an effective date of January 1, 2027. If you wanted S treatment for 2026 you are now in late-election territory, which is survivable and covered further down.

Why January 1 gives you March 15, not March 16

The 2-month period begins on the day of the month the tax year begins and ends with the close of the day before the numerically corresponding day of the second calendar month following that month. If there is no corresponding day, use the close of the last day of the calendar month.

Instructions for Form 2553 (Rev. December 2020), "When To Make the Election"

The operative words are the day before. Two months from January 1 is not March 1 for this purpose. The period runs from January 1 and closes at the end of February 28 — the day before the numerically corresponding day. Add fifteen days to February 28 and you land on March 15. Count it the intuitive way instead, two months to March 1 and then fifteen days, and you get March 16: one day late, and a perfectly valid election for a year you did not want.

The fallback in the second sentence handles months of unequal length, and it does not step back a further day. An entity whose first tax year began on December 31, 2026 has no February 31 to work from, so its two-month period ends on February 28, 2027 and its deadline is Monday March 15, 2027 — the same date as an ordinary calendar-year filer.

It is not "75 days"

A great deal of published guidance rounds the rule to "75 days from formation". Both halves are wrong. The count runs from the start of the tax year, not from formation, and the window is not 75 days: it is 73 days for a tax year beginning January 1 in an ordinary year, 74 in a leap year, 75 for one beginning June 1, and 76 for one beginning July 1, because the months in between are different lengths. If you have been working to a mental 75-day rule, you are between one and three days out, and the direction of the error is not in your favor for the most common start date of all.

Work out your own date

Enter the first day of the tax year you want the election to cover. The checker applies the two-month rule exactly as the instructions state it, applies the weekend and holiday roll, and tells you where you sit — including the case where the deadline has passed but relief is still open.

Worked examples

The mid-year entity, where most people lose the date

A new entity's first tax year does not begin when the state issued your certificate. It begins on the earliest of three events: the date it first had shareholders or owners, the date it first had assets, and the date it began doing business. That date goes on line E, and your deadline is measured from it. Our line-by-line instructions cover how to pick it.

The difference is not academic. An LLC registered on May 12, 2026 that had no capital, no assets and no activity until it took its first client payment on June 1 has a first tax year beginning June 1, 2026 and a deadline of August 15 — a Saturday, so August 17 in law and Friday August 14 in practice. Give that same LLC $500 of member capital on the day it was registered and its tax year began on May 12, which made its deadline Monday July 27, 2026. That deadline passed three days ago.

Weekends and holidays: file the business day before

IRC §7503 provides that when the last day for performing an act falls on a Saturday, Sunday or a legal holiday in the District of Columbia, the act is timely if it is performed on the next succeeding business day. That is why the 2026 calendar-year deadline was Monday March 16 rather than Sunday March 15.

Two things are worth knowing about relying on it. The Form 2553 instructions never mention the weekend rule — it appears nowhere in the form or its instructions — and there is a technical argument that a permissive election is not an act "required" within the literal trigger in §7503. Applying the roll is the universal practitioner position and is almost certainly right. It is also a bet you have no reason to take, because faxing the form costs nothing and a one-day error does not shorten your election, it moves it to a different tax year. Work to the last business day on or before the statutory date and the question never arises.

Filing early, and the trap underneath it

The second route in the rule is the generous one: you may file at any time during the tax year immediately preceding the one the election covers. A calendar-year business that already exists can file today, July 30, 2026, for an effective date of January 1, 2027, and it is timely. There is no minimum lead time, no penalty for being early, and no advantage in waiting.

There are two limits. The first is mild: "preceding" means the tax year immediately before, so you cannot file in 2026 for an effective date of January 1, 2028. The second is not mild at all.

Missing the deadline does not void your form

This is the most under-reported fact about Form 2553, and it is in the statute rather than buried in guidance. Under IRC §1362(b)(3), an election made after the deadline is treated as an election for the following tax year. Not rejected. Not returned. Not void.

The practical consequence is worse than a rejection would be, because a rejection at least tells you something is wrong. Someone who files in June 2026 for a January 1, 2026 effective date and does nothing else ends up with an S corporation from January 1, 2027, while spending 2026 running payroll, withholding, and preparing for a Form 1120-S that is not due. The mismatch usually surfaces a year later, by which point twelve months of payroll filings rest on a premise that was never true.

To keep the date you actually wanted you have to ask for it. Relief under Rev. Proc. 2013-30 is available for 3 years and 75 days after the effective date on line E, so an election effective January 1, 2026 stays in scope until March 17, 2029 — and because the revenue procedure describes that bound inconsistently by one day, treat March 16, 2029 as the real end and never file on the boundary. An extension of time to file Form 1120-S does not extend the window; the two run independently. The conditions, the header that goes in the top margin of page 1, and the wider set of consent signatures a late filing needs are set out in our late election guide and the full walkthrough of Rev. Proc. 2013-30.

What does not buy you more time

• Form 7004. It extends the time to file a return, not the time to make an election. There is no extension of any kind available for Form 2553.
• An extension to file Form 1120-S. It does not extend the 3-year-and-75-day relief window either. People assume the two move together. They do not.
• Waiting for an EIN. Neither the IRS nor your state stops the clock while paperwork is pending. Apply for the EIN as soon as the entity exists, because you will need it on the form.
• IRS processing time. The deadline concerns when you file, not when the IRS acts. Keep the fax transmission report or the certified-mail receipt — it is the only evidence of your filing date that will ever exist.
• A state-level S election. New York's Form CT-6 is separately required and must be approved; filing Form 2553 does nothing for it, and neither one's timing affects the other.

If your deadline is close

1. 1Settle line E before anything else

   The effective date determines the deadline, so getting it wrong changes which rules you are even playing by. For a new entity, that means checking the bank records for the earliest of owners, assets and activity.

2. 2Collect every signature you need

   Consents must be handwritten and every shareholder must sign. Chasing a co-founder is the step that most often runs a filing past its date, so start it first, not last.

3. 3Fax rather than mail

   A fax transmission report is same-day proof and costs nothing. Route by where the business actually operates, not where it was incorporated — see where to fax Form 2553 for the two service centers, or look up the IRS mailing address and fax number for your state.

4. 4Put the follow-up in your calendar

   The acceptance notice is CP261 and the IRS says to expect a determination in about 60 days, though it publishes no live processing estimate for this form — see Form 2553 processing time for what happens after you file. If nothing has arrived by then, call 800-829-4933 with your proof of filing to hand.

One last point of sequencing: the deadline is only worth chasing if the election is worth making. Below roughly $50,000 of profit the payroll and filing costs usually exceed the tax saved, and every dollar of salary you pay yourself reduces your Section 199A qualified business income dollar for dollar. If you have not run those numbers yet, do that before you race a date. Whether an S corp is worth it walks through the arithmetic.