What is the Form 2553 filing deadline?

The Form 2553 deadline is one of those rules that sounds simple but trips up roughly one in three new S-corp clients. The rule itself is in IRC section 1362(b)(1) and boils down to one sentence: the election must be filed no later than 2 months and 15 days after the start of the tax year for which it is to take effect.

For calendar-year businesses

Most LLCs use a January-to-December tax year. For those businesses the deadline is March 15. File the 2553 by March 15 and the S-corp election is effective January 1 of the current year, meaning all of this year's profit gets the S-corp tax treatment.

File on March 16, and the election does not take effect until January 1 of the following year. The whole current year of profit stays on Schedule C and gets hit with full SE tax. That is the single most expensive date-on-a-calendar in small-business tax practice.

For new entities

For a brand-new entity, the 2-month-15-day clock does not start on January 1. It starts on the earliest of:

• The date the entity first had shareholders or members.
• The date the entity first had assets.
• The date the entity began doing business.

Concrete example: an LLC formed on August 1 with its first client engagement on August 15 has until October 15 to file Form 2553 for a current-year election effective from formation. The new-entity rule routinely saves clients who formed mid-year and only realized later that they should have elected.

For fiscal-year businesses

If your business uses a fiscal year ending on a date other than December 31, your deadline is 2 months and 15 days after the start of your tax year. A June-30 fiscal-year filer must file by September 15. S-corps themselves are generally required to use a calendar year unless they qualify for and elect a Section 444 fiscal year - a separate filing on Form 8716.

Missed the deadline? Rev. Proc. 2013-30 is your friend

The IRS provides streamlined late-election relief under Rev. Proc. 2013-30. You can file Form 2553 up to 3 years and 75 days after the intended effective date and still get the election treated as if filed on time, provided four conditions are met:

1. The entity intended to be classified as an S-corporation as of the requested effective date.
2. The entity failed to qualify as an S-corp solely because the election was not timely filed.
3. The entity has reasonable cause for the failure to file timely.
4. All shareholders have reported their income consistent with S-corp treatment for the years in question (or have agreed to amend).

The reasonable-cause statement is a one-to-two paragraph narrative attached to the Form 2553 explaining why the election was late. Common acceptable reasons: the owner relied on a tax professional who failed to file, the owner was unaware of the election deadline, or the entity was newly formed and the owner was focused on operations. The IRS approves the vast majority of Rev. Proc. 2013-30 requests when the narrative is well-written and the consistency requirements are met.

How to file Form 2553

• All shareholders must sign Part I, column K of the form.
• The entity's officer signs at the bottom of Part I.
• Mail or fax to the IRS service center listed in the Form 2553 instructions for your state.
• Keep the certified-mail receipt or fax confirmation - this is your proof of timely filing.
• Expect the IRS CP261 Notice of Acceptance within roughly 60 days (sometimes 3 to 4 weeks, sometimes 90 to 120 days for late-relief filings).

State-level deadlines

Roughly a dozen states require a separate state-level S-election in addition to the federal Form 2553. Notable examples: California (Form 100S registration), New York (Form CT-6) and a shrinking handful of others. New Jersey dropped its separate election in December 2022, and Louisiana dropped its exclusion regime for periods beginning in 2026. State deadlines vary - some piggyback on the federal acceptance, others have independent windows. Missing a state deadline does not invalidate the federal election but can produce mismatched treatment for state income tax.

The deadline rules are mechanical, but the cost of missing them is real. If you are looking at the calendar in mid-March or realizing in June that you should have elected back in January, file under Rev. Proc. 2013-30. If you are still well inside the window, file the regular Form 2553 and lock in the savings starting day one of your current tax year.