Federal tax deadlines for 2026

Here are the key federal tax deadlines for the 2026 tax year:

January 15, 2026: Q4 2025 estimated tax payment due. This is the final estimated payment for the 2025 tax year.

January 31, 2026: Deadline to send W-2 forms to employees and 1099-NEC forms to contractors. Also the deadline to file W-2 and 1099-NEC transmittals with the Social Security Administration.

March 15, 2026: S corporation tax returns (Form 1120-S) and partnership returns (Form 1065) due for calendar year filers.

April 15, 2026: Individual tax returns (Form 1040) due. Also the deadline for C corporation returns (Form 1120). This is also Q1 2026 estimated tax payment due date.

September 15, 2026: Extended S corporation and partnership returns due (if March extension was filed). Also Q3 estimated tax due.

October 15, 2026: Extended individual tax returns due (if April extension was filed).

Quarterly estimated tax payment dates

Self-employed individuals in Florida must make estimated tax payments if they expect to owe $1,000 or more at tax time. These payments cover both income tax and self-employment tax.

2026 estimated payment schedule:

Q1 (Jan 1 — Mar 31): Payment due April 15, 2026

Q2 (Apr 1 — May 31): Payment due June 15, 2026

Q3 (Jun 1 — Aug 31): Payment due September 15, 2026

Q4 (Sep 1 — Dec 31): Payment due January 15, 2027

You can pay online through the IRS Direct Pay portal or using the Electronic Federal Tax Payment System (EFTPS). You can also mail a check with Form 1040-ES voucher.

Florida-specific deadlines

While Florida has no personal state income tax, businesses in Florida have several state-level deadlines to track:

Sales tax returns: Typically due on the 1st of the month following the reporting period and late after the 20th. Monthly filers submit by the 20th of each month. Quarterly filers submit by the 20th of April, July, October, and January.

Reemployment tax returns: Due quarterly on the last day of the month following each calendar quarter: April 30 (Q1), July 31 (Q2), October 31 (Q3), and January 31 (Q4).

Corporate income tax returns: Due May 1, 2026 for calendar year filers. Florida Form F-1120 (or F-1120A for short form).

Sunbiz annual report: Due by May 1, 2026 for LLCs and corporations. The fee is $138.75 for LLCs. Failure to file results in automatic dissolution.

Local business tax receipt renewal: Renew by your municipality’s deadline (often September 30 or October 1). Check with your city or county clerk.

Filing for an extension

If you need more time to file your tax return, you can request an extension. Here is what you need to know:

Individual returns (Form 1040): File Form 4868 by April 15, 2026. This gives you an automatic 6-month extension to October 15, 2026. No explanation needed.

Business returns: S corporations and partnerships file Form 7004 by March 15 for a 6-month extension to September 15. C corporations also file Form 7004 by April 15.

Important: An extension to file is NOT an extension to pay. You must estimate and pay any tax due by April 15 to avoid late payment penalties and interest. If you owe $5,000, pay as much as you can by April 15 even if you have not finished your return.

Penalties for missing deadlines

Missing tax deadlines can be expensive. Here are the penalties you could face:

Failure to file penalty: 5% of unpaid taxes per month (or partial month) that your return is late, up to 25%. If your return is more than 60 days late, the minimum penalty is the lesser of $485 or 100% of the tax due.

Failure to pay penalty: 0.5% of unpaid taxes per month, up to 25%. This runs simultaneously with the failure to file penalty but at a lower rate.

Combined penalty: If both apply, the failure to file rate is reduced by the failure to pay rate. Max combined rate: 5% per month.

Estimated tax underpayment penalty: Based on the federal short-term interest rate plus 3%. Calculated on the underpayment amount for each quarter.

Late sales tax penalty: Florida charges 10% of the tax due if late by less than 30 days, and higher for longer delays. Late payment interest also applies.

How to stay organized for 2026 tax deadlines

Staying organized throughout the year makes it easier to hit every deadline. Here are practical tips:

Use a tax calendar: Add all deadlines to your digital calendar (Google Calendar, Apple Calendar) with reminders 2 weeks and 1 week before each date. Include federal, state, and local deadlines.

Set up automatic payments: Use the EFTPS system or IRS Direct Pay to schedule estimated tax payments in advance. For sales tax, set up recurring payments through the Florida DOR e-Services portal.

Keep a running file: Dedicate a folder (physical or digital) for each quarter’s tax information. Include income records, expense receipts, and any tax correspondence.

Book a mid-year review: Schedule a tax check-in around June or July to review your year-to-date income, adjust estimated payments if needed, and ensure you are on track.

Work with a professional: A tax professional can help you stay on top of deadlines and ensure nothing is missed. Many offer year-round support services.