General federal deadlines. If a date falls on a weekend or holiday, it usually shifts to the next business day — we track every date for our clients.
Key dates at a glance
| Date | What's due | Details |
|---|---|---|
| January 31 | W-2s & 1099s issued | Employers and payers must furnish W-2 and most 1099 forms to recipients. |
| March 17 | S-Corp & partnership returns | Forms 1120-S and 1065 are due, or an extension must be filed. |
| April 15 | Individual & C-Corp returns | Form 1040 and Form 1120 are due. Any tax owed is due even if you extend. |
| October 15 | Extended individual returns | Final deadline for individual returns filed on extension. |
Quarterly estimated taxes
Quarterly estimated taxes are generally due April 15, June 15, September 15, and January 15. If you're self-employed or a business owner, missing these can trigger underpayment penalties — we calculate and remind you.