Deciding to elect S-corp status is only half the decision — the other half is timing it correctly, because the IRS gives you a narrow window to make the election effective for the current tax year, and missing it pushes the entire benefit out by a full year unless you qualify for relief.
The Real Deadline: 2 Months and 15 Days
To have an S-corp election apply to the current tax year, Form 2553 must generally be filed within two months and fifteen days of the start of that tax year. For a calendar-year business, that puts the 2026 deadline at March 16, 2026 (March 15 falls on a Sunday). A business formed partway through the year gets the same two-month-and-fifteen-day window measured from its actual start date, not from January 1.
Missed the Deadline? Late Election Relief Is Real and Commonly Granted
Revenue Procedure 2013-30 lets a business file Form 2553 late — with a reasonable-cause statement explaining the delay — as long as fewer than 3 years and 75 days have passed since the intended effective date. The catch is that all shareholders must have filed their own personal returns consistently with S-corp treatment for the entire intended period, meaning this relief works best when the mistake was purely administrative (nobody filed the form) rather than one where the shareholders’ returns don’t match up. Without qualifying for relief, an election filed after the deadline simply becomes effective the following January 1 instead.
Why Timing the Decision Matters More Than the Decision Itself
The tax math behind S-corp election (splitting profit into salary and distribution to reduce self-employment tax) doesn’t change based on when you file — but a full missed year of that savings, on a profitable business, can easily be worth more than the eventual benefit of “getting it right” a year late. Businesses that expect to cross the profit threshold where S-corp status pays off should plan the election alongside their business formation or fiscal-year planning, not treat it as an afterthought discovered during tax season.
One Election, Two Possible Starting Points
An existing LLC elects S-corp tax treatment by filing Form 2553 directly — no separate entity classification election is needed first, since Form 2553 handles the underlying classification change automatically for an eligible LLC. A newly incorporated C-corp follows the same Form 2553 process to become an S-corp, provided it meets the underlying eligibility rules (no more than 100 shareholders, one class of stock, and only eligible shareholder types).
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Related reading: LLC vs. S-Corp vs. C-Corp and S-Corp Reasonable Compensation.
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