2026 Sales Tax Deadlines Every Online Seller Should Know
Missing a sales tax deadline can mean penalties, interest, and a lot of stress. Whether you file monthly, quarterly, or annually, here's what you need to know about 2026 sales tax deadlines.
Understanding Filing Frequencies
States assign you a filing frequency based on how much sales tax you collect:
- Monthly: High-volume sellers (typically $1,000+ per month in tax)
- Quarterly: Mid-volume sellers (typically $100-$1,000 per month)
- Annual: Low-volume sellers (less than $100 per month)
Your assigned frequency can change as your business grows, so check your state's portal annually.
2026 Quarterly Due Dates
If you file quarterly, mark these dates:
| Quarter | Period | Due Date |
|---|---|---|
| Q1 | Jan 1 - Mar 31 | April 20, 2026 |
| Q2 | Apr 1 - Jun 30 | July 20, 2026 |
| Q3 | Jul 1 - Sep 30 | October 20, 2026 |
| Q4 | Oct 1 - Dec 31 | January 20, 2027 |
Most states use the 20th, but many don't — California, Washington and several others use the last day of the month, and New York's quarters don't follow the calendar at all. See our due dates for every state, and confirm with each state.
Monthly Filing Due Dates
Monthly filers typically must file by the 20th of the following month:
- January sales: Due February 20
- February sales: Due March 20
- And so on...
Some states (like Texas) use the 20th, while others might use the last day of the month. Check your state.
State-Specific Notes
Use these notes as a starting point, and confirm your assigned filing frequency and due dates with each state — they can differ by seller and change over time.
California
- Due date: Last day of the month following the reporting period
- Electronic filing required for most sellers
- Prepayment may be required for high-volume sellers
Texas
- Due date: 20th of the month following the reporting period
- Timely filing discount: 0.5% of the tax due when you file and pay on time (plus a 1.25% discount if you prepay)
- E-file at comptroller.texas.gov
New York
- Due date: 20th of the month following the reporting period
- New York's quarters run March–May, June–August, September–November and December–February, so quarterly filers file by June 20, September 20, December 20 and March 20
- File through NY Tax Department portal
Florida
- Due date: 1st through 20th of the month following (late after the 20th)
- Electronic payments must be started by 5 p.m. Eastern on the business day before the 20th
- File through Florida Department of Revenue
Pennsylvania
- Due date: 20th of the month following
- File through myPATH online portal
Tips for Never Missing a Deadline
1. Set Up Calendar Reminders
Add recurring reminders 5-7 days before each due date. This gives you time to gather numbers and file without rushing.
2. Use the Same Day Each Month
Pick a "tax day" (like the 15th) and always prepare your filings that day. Consistency builds habits.
3. Automate Where Possible
Many states allow automatic payments. Even if you review the return manually, setting up autopay helps make sure you don't accidentally miss the payment.
4. File Even When You Owe Nothing
In most states, you must file a "zero return" even if you had no sales. Missing a zero return can result in penalties and potentially losing your sales tax permit.
5. Keep Records Organized
Maintain clean records throughout the month instead of scrambling at filing time. Your e-commerce platform and Sails can help: Sails imports your orders and gives you sales-by-state reports.
What Happens If You Miss a Deadline?
Penalties
Most states charge a percentage of the tax due, often 5-25%. Some states also have minimum penalty amounts ($50 or more).
Interest
States charge interest on late payments, typically around 1% per month. Interest accrues from the original due date.
Losing Good Standing
Repeated late filings can put your sales tax permit at risk and may affect your business licenses.
The Bottom Line
Sales tax deadlines aren't complicated once you know your schedule. The key is setting up systems that remind you ahead of time and keep your data organized throughout the month.
Sails keeps a filing deadline calendar for the states you track, so every due date is in one place — just confirm your assigned filing frequency and due dates with each state.
Want every due date in one place? Sign up for Sails. It's free to start.
Find out where you owe sales tax
Drop in an order export and Sails checks your sales against every state's nexus rules, then shows you what to do next. Free, no signup — your file never leaves your computer.