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2026 US tax calendar

A working calendar for finance operators who need the next federal date on the wall, not a surprise in the inbox. Confirm current IRS guidance for your entity, fiscal year, and states. This page is informational and is not tax, legal, or accounting advice.

Pair these dates with a locked quarter and a 13-week cash view so estimated payments show up as outflows before they hit. See the quarterly tax-readiness checklist.

Information returns

  1. Furnish Form W-2 to employees and Form 1099 to recipients (most common 1099 series).

  2. File Form W-2 with the SSA. Many 1099 filings with the IRS are also due this date when not filing on paper with a later deadline.

Estimated taxes (individuals and most calendar-year pass-throughs)

  1. Q4 2025 estimated tax payment.

  2. Q1 2026 estimated tax payment.

  3. Q2 2026 estimated tax payment.

  4. Q3 2026 estimated tax payment.

  5. Q4 2026 estimated tax payment.

Returns and extensions

  1. Calendar-year S corporation (Form 1120-S) and partnership (Form 1065) returns. March 15, 2026 falls on a Sunday.

  2. Calendar-year individual returns (Form 1040) and C corporation returns (Form 1120), plus Q1 estimates.

  3. Extended calendar-year partnership and S corporation returns.

  4. Extended calendar-year individual returns.