Sales Tax Permits and Filing: A Guide for Small Businesses
Sales Tax Permit in a Nutshell
A sales tax permit allows your business to collect sales tax from customers and pay it to the state. States call it different names: seller's permit, sales tax license, certificate of authority. It works the same way everywhere.
Key points
No federal permit exists. You register separately in each state.
Register before your first taxable sale.
After registering, you file returns regularly, even with zero sales.
Where sales tax applies:
45 states + Washington, DC have a statewide sales tax.
Alaska, Delaware, Montana, New Hampshire and Oregon do not.
Many Alaska cities and boroughs still charge local sales tax.
Do You Need a Permit?
You need a permit in every state where you have nexus, meaning a strong enough connection to that state.
Type of nexus |
What triggers it |
|---|---|
Physical |
An office, store, warehouse, inventory or employees in the state |
Economic |
Sales into the state above a set threshold, even without a physical presence |
Economic nexus has applied since the Supreme Court ruling in South Dakota v. Wayfair (June 21, 2018). Each state sets its own threshold:
State |
Threshold |
|---|---|
South Dakota and many others |
$100,000 in annual sales |
California |
$500,000 |
Texas |
$500,000 over the previous 12 months |
New York |
over $500,000 and over 100 sales in the previous 4 quarters |
Several states, including South Dakota, have dropped the 200-transaction test.
Watch your numbers
Thresholds often count all sales, not just taxable ones.
Marketplace sales often count too.
Check your sales by state every quarter.
Why does the same item cost more one town over?
State, county and city rates add up. See how sales tax is calculated and why it varies by state.
How to Register
Check where you have nexus. Start with your home state, then review thresholds in the states where you sell.
Prepare your details:
legal business name and structure,
your Employer Identification Number (EIN), or your Social Security number if you are a sole proprietor without an EIN,
business address and bank details,
what you sell and your expected monthly sales.
Apply online with the state's tax agency (department of revenue or comptroller).
Save your permit details: permit number, start date and filing frequency. Some states require renewal, so note any expiration date.
One registration, 24 states
The Streamlined Sales Tax system (SSTRS) covers 24 states with one free form.
Select only states where you actually have an obligation. Each selected state expects returns from you.
Most states respond within 15 business days.
Collecting Tax Correctly
Use the combined rate, meaning state plus local rates. In most states, the buyer's delivery address determines the rate.
List sales tax separately on every invoice and receipt. See the rules for invoices with and without sales tax.
Keep exemption and resale certificates for every tax-free sale.
Track taxable, exempt and total sales separately. Your return asks for all three.
Filing Sales Tax Returns
The state assigns your filing frequency after registration: monthly, quarterly or annually. The more tax you collect, the more often you file.
What a return typically contains:
gross sales into the state,
exempt sales,
taxable sales,
tax due, by local jurisdiction where required.
Example: Texas
Item |
Rule |
|---|---|
Filing frequency |
Assigned by the Comptroller by letter |
Monthly return due |
20th of the following month (April → May 20) |
Late report |
$50 penalty |
Late payment |
5% (1–30 days), 10% (over 30 days) |
Two rules that apply almost everywhere:
Zero sales? File anyway. A missed zero return can still result in a penalty.
Collected tax is not your money. Set it aside until the due date.
Common Mistakes
Charging tax before you have a permit.
Ignoring economic nexus outside your home state.
Late returns or skipped zero returns.
Tax-free sales without exemption certificates.
Closing a business without a final return.
FAQ:
Is a sales tax permit the same as a business license?
No. A business license lets you operate. A sales tax permit lets you collect sales tax. Many businesses need both.
Do I need a permit if I sell only online?
Yes, in your home state and in every state where you cross the economic nexus threshold.
How long does registration take?
It depends on the state. Many states issue a permit number soon after you apply online. Through SSTRS, most states respond within 15 business days.
Do I file a return if I had no sales?
Usually yes. You file for every assigned period, even when the tax due is zero.
What if I have been selling without a permit?
Register right away and contact the state about past periods. Many states offer voluntary disclosure programs with reduced penalties.
How do I close a sales tax permit?
File a final return and ask the state to close your account. If you only fell below a threshold, check that state's rules first.
