When is the S-corp election deadline for 2026?

For existing entities, March 16, 2026 for calendar-year 2026 effectiveness (2 months 15 days). New entities have 75 days from formation. Late relief via Rev Proc 2013-30 is often available with reasonable cause.

Who qualifies for S-corp?

Domestic corp or eligible LLC, 100 or fewer allowable shareholders, one class of stock, eligible shareholders (individuals, estates, qualifying trusts, no partnerships/corporations/nonresident aliens).

How much does S-corp save?

Saves 15.3% SE tax on distributions above reasonable salary, offset by payroll costs and admin. Breakeven often around $60-80k profit for services, higher for capital-intensive — model with QBI and state PTET.

What is reasonable salary?

What you would pay an unrelated person for your role, hours, and market. Document with comps, duties, and time. Zero or nominal salary is the fastest audit flag.

TAX

S-Corp Election 2026: Form 2553 Deadlines, Requirements, and Tax Math

BATO Editorial Team October 04, 2026 3 min read

Quick Math

Profit $120k, salary $70k, distributions $50k: SE-tax saving ≈ $50k × 15.3% = $7,650 minus payroll tax admin and CPA. Below $50k profit, costs often erase savings.

Pair with Startup Entity Selection, Tax Deductions, Payroll Guide, and 1099 vs W-2.

Eligibility Checklist

Domestic, 100 or fewer, one class, eligible shareholders.
All shareholders consent; state S-election mirrored where required.
Calendar vs fiscal year confirmed; QSub elections aligned.

Form 2553 Filing

File by 2m15d; fax + certified mail proof; confirm IRS acceptance (CP261).
Late relief: attach Rev Proc statement, reasonable cause, all consents.
State: many follow federal, some require separate election — check nexus states — see Multi-State and SALT.

Running an S-Corp Without Penalties

Payroll monthly/quarterly with reasonable salary; tie to GL — see Month-End Close.
Distributions pro-rata; track basis and AAA.
No second class via disproportionate distributions or side agreements.
File 1120-S + K-1s; calendar with Filing Deadlines and Year-End Planning.

Enforce roles per QuickBooks vs Xero and retain per Record Retention.

Reasonable Salary: The Three Tests (With Numbers)

The IRS wins these cases on comparables, not vibes. Build the file before filing:

Role comps. Same duties, market, hours. A full-time CTO-operator in Austin at $140k market can’t take $30k salary with $200k distributions. Pull 2–3 salary surveys or job postings and file them.
Time and duties log. 40 hrs/week managing 12 staff supports officer-level pay; 5 hrs/week passive oversight supports far less. Part-time founders get part-time salaries — document hours quarterly.
Distribution proportionality. Salary-to-distribution ratio is the auditor’s first screen. $30k salary + $270k distributions (10%) screams; $140k salary + $160k distributions (47%) with comps backing $140k is defensible.

Worked: $230k profit, owner-operator, market salary $130k. SE-tax saving = ($230k − $130k) × 15.3% ≈ $15,300, less ~$2,000 payroll admin/CPA = ~$13k net, plus QBI and retirement interactions modeled jointly. At $60k profit with $45k salary, saving ≈ $2,300 — often not worth the payroll overhead. The breakeven moves with QBI deduction value and state PTET — see Year-End Planning and Estimated Taxes.

Late Election Relief (Rev Proc 2013-30, Step by Step)

Missed March 15? Relief is routinely granted when done right:

File Form 2553 late with “FILED PURSUANT TO REV. PROC. 2013-30” at the top.
Attach reasonable-cause statement (CPA never advised, administrative oversight — specific, not “we forgot”).
Attach all shareholder consents with “consents to election and to late filing” language and dates.
Show consistent S-corp reporting (1120-S filed, K-1s issued, reasonable-salary payroll run) — relief fails when returns contradict the election.
File within 3 years 75 days of the intended effective date.

File by fax with transmission proof plus certified mail; confirm CP261 acceptance and calendar the state mirror separately — some states don’t follow federal relief automatically — see Multi-State.

S-Corp Killers (Silent Terminators)

Second class of stock. Disproportionate distributions, side agreements with different rights, or botched buy-sell terms. Distributions must stay strictly pro-rata — track in the Month-End Close.
Ineligible shareholder. Transfer to a partnership, corporation, or nonresident alien; exceeding 100 shareholders via family attribution. Review the cap table before every transfer — see Cap Table.
Excess passive income (former C-corp). Over 25% passive income three years running with C-corp E&P terminates the election and triggers entity tax. Monitor annually if converted.

Any one terminates the election mid-year, often discovered at return time. Prevention is a shareholder-register review each January, not diligence-week panic.