Form 2553 Deadline: When Your S-Corp Election Starts

An LLC is a legal box. An S-corp is a tax election.

You don't "feel like an S-corp" because your logo looks corporate. You file Form 2553 and the IRS accepts a start date. Miss that date and you can spend a whole year paying self-employment tax on profit you meant to split into salary and distributions.

Q4 is when this mistake shows up. Someone has a good year, Googles S-corp in October, and wants it effective January 1 of the year they're already in. That's not how the calendar works.

The system is complex on purpose. This form is one of the simple levers inside it. Regular people are allowed to use it. You just have to hit the window.

The actual due date

For a calendar-year business, Form 2553 is generally due by March 15 of the year you want the S-corp to start (the 15th day of the third month). You can also file it during the year before.

New entity: you usually have two months and 15 days from the entity's tax-year start (often the formation date for a new LLC that wants to be an S-corp from day one).

Situation	Typical start	Typical 2553 timing
Existing calendar-year LLC, want S-corp this year	January 1 of this year	File by March 15 of this year (or last year)
Existing LLC, you missed March	Next January 1	File now for next year
Brand-new LLC this year	Often formation date, if you elect on time	Two months and 15 days from the tax-year start
You filed late but qualify for relief	The date you requested, if relief works	Rev. Proc. 2013-30 style late election, not a vibe

Takeaway: October does not turn this year into an S-corp year unless late relief actually applies. Don't pay for a fantasy effective date.

Example: A coach with $220K net on a default LLC decides on September 22 they want S-corp "for 2026." Calendar year 2026 started in January. The March 15, 2026 window is gone. The honest plan is elect for 2027, run reasonable salary next year, and ask whether late relief can reach backward. Late relief is a facts-and-circumstances process. It is not a button in Gusto.

Late relief is real. It is not automatic.

The IRS has procedures for late S elections when you intended to elect, you were eligible, you file the form a certain way, and you have a reasonable cause story.

"I was busy" is a weak story. "We formed in February, the CPA thought the LLC default was enough, we ran like shareholders" is a better file. Still not a guarantee.

If someone promises they can make any year an S-corp year because they know a guy, hang up. No zero-tax promises. No magic dates.

What has to be true besides the form

Eligible shareholders (generally individuals, certain trusts and estates, no partnerships or corporations as owners in the usual small shop).
One class of stock (LLC operating agreement that looks like preferred equity can blow this).
All shareholders sign.
You will run payroll. An S-corp with no reasonable salary is how you buy an audit.

An S-corp is like being both an employee and owner. The IRS taxes those seats differently. The form is how you raise your hand.

Who should wait

Under $400K, don't elect just because a thread said everyone needs an S-corp. Payroll, unemployment, extra filings, and a salary that's too low can eat the savings. Get books clean. Make more. Come back when profit is stable enough that the split is worth the admin.

Right now advanced tax strategy isn't where your focus should be if you're not losing that money yet. You'd be paying me to save money you're not losing yet. Go make more first, get your structure clean, and when you're at that level come back and we'll go to work.

Q4 after September 15 is a great time to plan next year's election, not to pretend this year's already started.

The short version

Form 2553 is the S-corp election. The LLC paperwork is not.
Calendar-year due date is usually March 15 of the start year, or anytime the prior year.
New entities: two months and 15 days from the tax-year start.
Q4 is mostly next-year planning plus a hard look at late relief.
No payroll, no point. Salary has to be real.
Under $400K, basics first. Over that, missing this form is expensive.

FAQs

When is Form 2553 due?

For most calendar-year businesses, by the 15th day of the third month of the year the election should start (March 15) or any time during the preceding year. New companies often have two months and 15 days from the beginning of the tax year.

Can I file Form 2553 in December for this year?

Usually no, not for a January 1 start of the year you're already in. December is on time for a next calendar year start. This year would need a timely March filing or qualifying late-election relief.

What if I already missed the deadline?

Ask about late S election relief. You still have to have been eligible and you still have to file the form the way the procedure requires. Don't assume. File or you stay default-taxed.

Does my state need a separate S-corp election?

Some states piggyback on the federal election. Some want their own form. California, New York, and others have extra issues. That's part of the planning, not a footnote.

Is Form 2553 the same as forming an LLC?

No. You form with the state. You elect with the IRS. Most owners do both: LLC first, 2553 second.

Will electing S-corp in Q4 lower this year's tax?

Not if the effective date is next January. This year's profit is already living under this year's classification. Plan Q4 spending and estimates on reality, not on an election you haven't made.

References

What to do next

If you wanted S-corp this year and nobody filed 2553, that's the leak. If you want it next year, Q4 is when you put it on the calendar.

At CEOHAVEN, we help entrepreneurs and real estate investors with tax planning and tax preparation. You have a team that handles the election and the payroll that has to follow it.

Book a call. We'll look at profit, timing, and whether this year or next year is the honest start date.

It's not about how much you make. It's about how much you keep.

Form 2553 Deadline: When an S-Corp Election Actually Starts