Filing & Deadlines

Can I choose my own filing frequency, or does the state assign it?

States assign filing frequency based on your tax liability, you don't choose it. High-liability sellers file monthly; lower-liability sellers are assigned quarterly or annual. SST states require monthly filing regardless of volume.

Can my filing frequency change as my revenue grows?

Yes. States reassign filing frequency based on your tax liability, as revenue grows and monthly tax liability increases, states upgrade sellers from annual to quarterly to monthly filing. Notices are sent by mail to your registered address, which many sellers miss.

Do I need to file a zero return if I have nexus but no sales?

In most states, yes. If you have an active permit, you must file every period, even with zero sales. Missing a zero return triggers the same penalties as missing a regular return.

How do I file a final return when closing a sales tax permit?

A final return covers the last period of activity through your permit closure date. Mark it as 'final' in the state portal, report all remaining taxable sales and tax collected, remit the balance, and submit. The state uses this to close your account, without it, your permit remains open.

How do I file an amended sales tax return if I made an error?

To file an amended sales tax return, log into the state's taxpayer portal, locate the original return for the period, and submit a corrected version. If the amendment results in additional tax owed, pay it with the amendment, interest accrues from the original due date. Overpayment amendments generate a credit or refund.

How do I file sales tax returns across 20+ states without missing deadlines?

Filing across 20+ states manually is untenable at scale. AutoFile software handles multi-state deadline management and submission. SST states are covered through CSP AutoFile at no charge. Here's how to set it up correctly.

How do I handle filing in states where a marketplace collects on my behalf?

Even when Amazon or another marketplace collects and remits sales tax, you may still need to file a return in that state. Most states require marketplace sales to be reported as gross sales with a deduction, not omitted. Here's what the return looks like.

How do I handle sales tax on refunds and returns when filing?

When you refund a customer, you've refunded tax you already collected and remitted. You recover it by deducting the refunded amount from gross sales on your next return, or by filing an amended return for the original period. Most sellers take the current-period deduction.

How often do I need to file sales tax returns?

Filing frequency is assigned by each state based on your sales volume. Most mid-market brands are monthly in top states, quarterly or annual elsewhere. SST states are always monthly.

I registered mid-month — do I owe sales tax from the 1st or from my registration date?

From your registration date, not the 1st. Your first return covers sales from your permit effective date through the end of the period. Here's how to handle it step by step.

Sales tax filing deadlines by state — reference guide

Sales tax return due dates vary by state and by your assigned filing frequency (monthly, quarterly, annual). Most states set due dates at the 20th, 25th, or last day of the month following the reporting period. This reference guide summarizes due date patterns by state.

What happens if I miss a sales tax filing deadline?

Missing a sales tax filing deadline triggers late filing penalties, late payment penalties, and interest, even on zero-tax returns. Most states accept first-offense abatement requests. File as soon as you realize the miss.

What is a prepayment requirement in sales tax, and which states require it?

A prepayment requirement means large sellers must remit an estimated payment mid-period (before the return is due) based on either the prior period's liability or a percentage of current-period collected tax. California and New York are the primary states with prepayment requirements for high-volume sellers.