Last reviewed: June 2026 This article is for general educational purposes only and is not tax, legal, or accounting advice. Rules can change, and your filing obligations depend on your facts. Consider working with a CPA, EA, or attorney before making tax elections or filing decisions.

For a calendar-year LLC or corporation, the practical S-Corp election deadline is usually March 15 of the year the election should take effect. A new business may use a different deadline because the IRS calculates the due date from the beginning of the tax year the election should apply to.

The form used for this election is IRS Form 2553, Election by a Small Business Corporation. If the form is late, the business may need to request late election relief instead of assuming S-Corp treatment automatically applies.

Already filed Form 2553?

This guide explains when Form 2553 is due. If you already submitted Form 2553 and want to know whether the IRS accepted your S-Corp election, read our guide on how to check your S-Corp status online .

Quick answer: when is the S-Corp election deadline?

The deadline depends on whether the business already existed, when its tax year began, and which tax year the S-Corp election should apply to. For most calendar-year businesses, March 15 is the date people remember, but the full IRS rule is more specific.

Situation Typical deadline What it means
Existing calendar-year business Usually March 15 File by the March deadline for the election to apply to that same calendar tax year.
New LLC or corporation Generally 2 months and 15 days from the tax year start The deadline may be later than March 15 if the business tax year starts after January 1.
Future-year S-Corp election Any time during the preceding tax year A business can generally file Form 2553 during the year before the election should take effect.
Missed deadline Late election relief may be available The business may need to request relief under Rev. Proc. 2013-30 or another applicable procedure.
Already filed Form 2553 IRS determination generally within 60 days If no IRS notice arrives within 2 months, follow up with the IRS Business Specialty Tax Line.
An S-Corp election is not just a deadline

Form 2553 changes how the business is taxed for federal tax purposes. It does not remove payroll duties, shareholder rules, state filings, bookkeeping requirements, or the need for tax planning.

The 2026 S-Corp election deadline for calendar-year businesses

If your business uses a normal calendar tax year from January 1 to December 31, the S-Corp election deadline is usually March 15 of the year the election should take effect. This is why many small business owners think of March 15 as the Form 2553 deadline.

For the 2026 tax year, a calendar-year business that wants S-Corp treatment starting January 1, 2026 would normally plan around the March 2026 deadline. Because March 15, 2026 falls on a Sunday, confirm the exact filing date using current IRS instructions or a tax professional before filing close to the deadline.

Election year Requested effective date Typical deadline Best practice
2026 January 1, 2026 March 2026 deadline window File before March 15 if possible.
2027 January 1, 2027 March 2027 deadline window File during 2026 or early 2027.
Future year January 1 of that year During the prior year or early in the election year File before year-end if the decision is already made.

Do not wait until the final day if you can avoid it. If the form is missing a signature, uses the wrong EIN, or lists the wrong effective date, the mistake can become harder to fix after the deadline has passed.

How the 2 months and 15 days rule works

The IRS rule is not simply “March 15 for everyone.” Form 2553 is generally due no more than 2 months and 15 days after the beginning of the tax year the election should take effect.

For a calendar-year business whose tax year starts January 1, that rule points to the March deadline. For a new business whose first tax year starts later, the deadline can be different.

Simple rule

Start with the first day of the tax year the S-Corp election should apply to. Then count 2 months and 15 days. That is the general Form 2553 deadline, unless a special rule or late relief applies.

S-Corp election deadline examples for new LLCs

New LLCs often get confused because they may form after March 15. That does not automatically mean the business missed its S-Corp election window.

The deadline depends on the beginning of the tax year the business wants the S-Corp election to apply to. For a newly formed business, that date may be tied to when the entity first had owners, assets, or business activity.

Example Requested S-Corp effective date General deadline logic Result
LLC starts January 1 January 1 2 months and 15 days from January 1 March deadline window
LLC starts June 1 June 1 2 months and 15 days from June 1 Mid-August deadline window
LLC starts November 8 November 8 2 months and 15 days from November 8 January deadline window for the short year
Existing LLC wants next-year election January 1 of next year Can generally file during the preceding tax year File before the year starts if possible

These examples are simplified. If the business has a fiscal year, changed its tax year, started with a short tax year, or has unusual ownership, use the current IRS instructions and ask a tax professional.

What happens if you miss the S-Corp election deadline?

If Form 2553 is late, the election may not take effect for the year you wanted. In many cases, the election is treated as effective for a later tax year unless the business qualifies for late S-Corp election relief.

Late election relief is not the same as pretending the deadline did not matter. The business must usually show that it intended to be an S-Corp, had reasonable cause for filing late, and acted diligently to correct the mistake.

Question Why it matters
Did the business intend to be taxed as an S-Corp? Late relief generally depends on the election being late, not on a later change of mind.
Was the business otherwise eligible? Late filing relief does not fix every S-Corp eligibility problem.
Was there reasonable cause? The IRS usually expects an explanation for why the deadline was missed.
Did the business act quickly after discovering the issue? Waiting too long after finding the mistake can weaken the relief request.
Were returns filed consistently with S-Corp status? In some late-relief situations, shareholder consistency matters.
Do not use late relief casually

Late S-Corp election relief can be useful, but it is still a tax procedure. If payroll, shareholder reporting, Form 1120-S, or prior returns are involved, get professional help before filing.

What does “filed pursuant to Rev. Proc. 2013-30” mean?

“Filed pursuant to Rev. Proc. 2013-30” means the business is asking the IRS to accept a late S-Corp election under the IRS late-election relief procedure. The phrase should be placed at the top margin of Form 2553 when the business is requesting that relief.

This phrase does not automatically approve the election. It tells the IRS that the filing is being made under a specific relief procedure and should be reviewed that way.

Phrase Where it goes Purpose
FILED PURSUANT TO REV. PROC. 2013-30 Top margin of Form 2553 Signals a late S-Corp election relief request
Reasonable cause statement Line I or attached statement Explains why the form was not filed on time
Shareholder/member statements Attached where required Supports consistent S-Corp treatment
Form 1120-S attachment Only where the procedure allows May be used in certain late-election situations

How to file Form 2553 correctly

Form 2553 is a short form, but small mistakes can delay the election. Before sending it, check the legal name, EIN, address, requested effective date, tax year, signatures, and shareholder or member consent.

  1. Use the current IRS form and instructions. Do not copy an old template from another site without checking the IRS version.
  2. Enter the exact legal business name. Match the name used with the IRS and the EIN.
  3. Use the correct EIN. If the business does not have an EIN, apply for one before filing Form 2553.
  4. Choose the correct effective date. The date on Form 2553 drives the deadline calculation.
  5. Get the required signatures. Missing signatures can make the form invalid or untimely.
  6. Fax or mail it to the correct IRS location. Use the current IRS instructions because addresses and fax numbers can change.
  7. Keep proof. Save fax confirmation, certified mail receipt, a copy of the signed form, and any IRS response.
Fax vs mail

The IRS instructions allow Form 2553 to be sent by fax or mail to the listed service center. Faxing can create quick proof of transmission, while certified or registered mail can create proof of mailing.

What happens after you file Form 2553?

After Form 2553 is filed, the IRS service center reviews the election and notifies the business whether the election is accepted or not accepted. The IRS instructions say the business should generally receive a determination within 60 days after filing.

If no acceptance or nonacceptance notice arrives within 2 months of the fax or mailing date, the IRS instructions say to call 1-800-829-4933. Keep proof of filing because the IRS may ask for evidence that Form 2553 was sent on time.

After filing What to do
Immediately Save the signed form and proof of fax or mailing.
Within 60 days Watch for an IRS acceptance or nonacceptance letter.
After 2 months with no notice Call the IRS Business Specialty Tax Line.
If IRS questions the filing Provide acceptable proof such as certified mail receipt, stamped copy, or IRS acceptance letter.

For the full post-filing process, use the dedicated guide: How to Check S-Corp Status Online .

Should you elect S-Corp status?

Meeting the deadline does not mean the S-Corp election is the right move. S-Corp treatment can reduce some self-employment tax exposure in the right situation, but it also adds payroll, corporate tax returns, bookkeeping, and reasonable salary issues.

A business with low profit may spend more on payroll software, accounting, and tax preparation than it saves. A business with higher net profit and stable owner compensation may be a better candidate.

S-Corp may make sense when S-Corp may be premature when
The business has consistent profit after expenses. The business is still testing demand.
The owner can run payroll and pay a reasonable salary. The owner cannot afford payroll compliance.
Tax savings exceed accounting and payroll costs. Annual profit is too low to justify extra administration.
The business has clean bookkeeping. Revenue and expenses are not separated clearly.
A tax professional has reviewed the numbers. The decision is based only on social media advice.

Before electing S-Corp status, compare the extra payroll and tax filing costs against the expected tax savings. Read our detailed comparison of LLC vs S-Corp and see our related S-Corp Reasonable Salary Guide .

State S-Corp election rules can be different

Form 2553 handles the federal S-Corp election. Some states follow the federal election automatically, while others may require a separate state election, registration, form, or tax treatment.

This matters because a business can be treated as an S-Corp federally but still have separate state requirements. Always check the state where the business is formed and any state where it is registered to do business.

Federal approval is not the whole compliance picture

An accepted federal Form 2553 does not automatically solve state franchise taxes, payroll registrations, unemployment insurance, annual reports, local licenses, or state-level S-Corp elections.

Common Form 2553 deadline mistakes

Most Form 2553 problems are not complicated tax theory. They are basic filing mistakes that create timing problems.

  • Using the wrong effective date.
  • Missing one or more shareholder or member signatures.
  • Using a business name that does not match IRS records.
  • Using the wrong EIN or filing before getting an EIN.
  • Mailing or faxing to outdated IRS information.
  • Assuming state LLC approval means federal S-Corp approval.
  • Waiting until tax season to discover that Form 2553 was never accepted.
  • Claiming S-Corp tax treatment before payroll and bookkeeping are ready.

If you are still deciding whether S-Corp status is worth it, start with the tax structure and salary guides before filing Form 2553.

This article is general information only. S-Corp elections can affect payroll, owner compensation, tax returns, state filings, and prior-year reporting. Ask a qualified tax professional before filing if your situation is complex.