The 2026 filing season is here, and missing a deadline can mean penalties and interest that add up quickly. Below are the federal dates most taxpayers should have on their radar. State deadlines often mirror federal ones, but not always — confirm the rules for every state you file in.
Individual Returns
For most individuals, the big date is April 15, 2026 — the deadline to file your 2025 Form 1040 and pay any balance due. Filing for an extension gives you until October 15, 2026 to submit the return, but remember: an extension to file is not an extension to pay. Interest and penalties accrue on unpaid balances from April 15 onward.
If you expect a refund, filing early is usually the fastest way to get your money — and it reduces the window for identity thieves to file a fraudulent return in your name.
Business Returns
Calendar-year partnerships and S corporations generally must file by March 16, 2026 (March 15 falls on a Sunday this year). C corporations file by April 15. If your business needs more time, extensions are available — but owners still need their Schedule K-1s to complete personal returns, so don’t treat the extension as a reason to stall.
Information Returns
Businesses must generally furnish W-2s to employees and 1099-NEC forms to contractors by February 2, 2026 (January 31 falls on a Saturday). Late or missing information returns carry per-form penalties that escalate the longer they go uncorrected.
Estimated Tax Payments
If you pay quarterly estimated taxes — common for the self-employed, retirees with untaxed income, and business owners — the remaining 2026 due dates are generally:
- Q1: April 15, 2026
- Q2: June 15, 2026
- Q3: September 15, 2026
- Q4: January 15, 2027
Underpaying estimates can trigger a penalty even if you’re owed a refund when you file, so it’s worth reviewing your payments mid-year.
What If You Can’t Pay?
File on time anyway. The failure-to-file penalty is typically far steeper than the failure-to-pay penalty, and the IRS offers payment plans for balances you can’t cover immediately. If you’re already behind on prior years, addressing it voluntarily is almost always better than waiting for a notice.
This article is provided for general informational purposes only and does not constitute tax, legal, or accounting advice. Deadlines can shift for weekends, holidays, and federally declared disasters — always confirm current dates at IRS.gov or with a qualified tax professional.