State-by-State Sales Tax Filing Deadlines for E-Commerce Sellers
Updated 2026-08-03
US sales tax filing deadlines vary by state, with most requiring monthly or quarterly returns due between the 15th and 25th of the following period. States like California require filing by the last day of the month following the reporting period, while Texas requires filing by the 20th. High-volume sellers typically file monthly, while lower-volume sellers may qualify for quarterly or annual filing.
Primary sources
This page is grounded in the primary materials below. Rules change, so open the source and confirm the current version before acting.
FAQ
When is sales tax due in California?+
California sales tax returns are due by the last day of the month following the reporting period. For example, January sales are due by February 28. Monthly filers must file by the last day of each month; quarterly filers file by the last day of the month following the quarter end.
What happens if I file sales tax late?+
Late filing penalties vary by state but typically include a flat penalty (e.g., $50 in Texas) plus interest on unpaid tax. California charges a 10% penalty plus 0.5% monthly interest. Some states offer amnesty programs for first-time non-compliance.
How do I determine my filing frequency?+
Filing frequency is typically assigned by the state based on your sales volume. High-volume sellers ($10,000+/month) file monthly, medium-volume file quarterly, and low-volume file annually. When you register for a sales tax permit, the state assigns your frequency.
Do marketplace sellers need to file sales tax returns?+
Yes, even if the marketplace collects and remits sales tax on your behalf (under marketplace facilitator laws), you may still need to file returns showing zero tax due in states where you have nexus. Always check individual state requirements.
What is the Streamlined Sales Tax filing system?+
The Streamlined Sales Tax (SST) project is a coalition of 24 states that standardize sales tax administration. SST-certified sellers get free tax rate lookup, simplified filing, and reduced audit risk. Registration is free through streamlinedsalestax.org.
Are there sales tax filing exemptions for small sellers?+
Some states offer small seller exemptions from economic nexus obligations (e.g., $100,000 in sales or 200 transactions thresholds). However, once you exceed the threshold in a state, you must register and file. The thresholds vary by state and are based on the prior or current calendar year.
Continue checking
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