What Sales Tax Payment Means and Who Has to Pay
Sales tax payment is money you send to your state or local government based on sales you have made. If you own a business that sells goods or services, you collect sales tax from customers at the point of sale, then send that money to the state on a schedule they set. You do not keep the tax — it flows through your business to the government.
Not every business pays sales tax. You only owe it if you sell taxable items in a state that has a sales tax. Some states have no sales tax at all (Alaska, Delaware, Montana, New Hampshire, and Oregon). Other states tax only goods, not services. The rules depend on what you sell and where you sell it.
If you have a physical location in a state, you must register for a sales tax permit before you open. If you sell online or by mail to customers in other states, you may owe sales tax in those states too, depending on your sales volume and the state's rules. This is called nexus — the connection that triggers your obligation to collect and pay.
Key Takeaways
- You must register for a sales tax permit with your state before you start collecting tax, and registration is free but required by law.
- Sales tax payment schedules vary by state and by your sales volume — some businesses pay monthly, others quarterly or annually.
- You report the tax you collected on a return form, then send the money to the state revenue department, not to a federal office.
- If you sell online or across state lines, you may owe sales tax in multiple states, and the rules change based on your total sales each year.
- Penalties for late or incomplete payment include interest charges and fines that grow quickly, so paying on time matters more than paying perfectly.
How to Register for a Sales Tax Permit
Before you collect your first dollar in sales tax, you must register with your state's revenue or taxation department. This is a legal requirement, not optional. Registration is free — the state does not charge you to get a permit.
The process differs by state. Most states let you register online through their revenue department website. Some still require a paper form mailed in. You will need your Social Security number or Employer Identification Number (EIN), your business address, the type of business you run, and the date you plan to start selling. A few states ask what products or services you will sell, because different items have different tax rates.
Registration usually takes one to two weeks. Some states issue a permit number the same day online; others mail a physical certificate. Once you have your permit number, you can start collecting tax from customers. You must display the permit number on invoices and receipts if the state requires it.
Payment Schedules: When You Send Money to the State
The state tells you when to pay based on how much tax you collect. Most states use one of three schedules: monthly, quarterly, or annual. Your schedule depends on your sales volume and your state's rules.
Monthly payments are the most common. You collect tax during the month, file a return by the 20th or 25th of the next month, and send the payment with the return. Quarterly payments happen every three months — usually due by the last day of the month after the quarter ends. Annual payments are rare and usually only for very small businesses or specific industries.
Some states let you choose your schedule if your sales are below a certain amount. Others move you to a more frequent schedule automatically once you hit a sales threshold. Your state revenue department will tell you your schedule when you register. If your sales grow, the state may change your schedule and notify you in writing.
How to File a Return and Send Payment
On your payment due date, you file a sales tax return with the state. This form shows how much tax you collected during the reporting period. The return asks for your total sales, the amount of tax you collected, any deductions or exemptions you claimed, and the net tax you owe.
Most states let you file and pay online through their revenue department website. You log in with your permit number, enter the numbers from your records, and the system calculates what you owe. You then pay by electronic transfer (ACH), credit card, or debit card. Some states still accept checks mailed with a paper return form, but online payment is faster and creates a record the state can verify immediately.
Keep copies of every return you file and every payment receipt. The state keeps records too, but if there is ever a dispute about whether you paid, your own copies protect you. Save bank statements and credit card statements that show the payment went through.
What Happens If You Miss a Payment or Pay Late
If you do not pay by the due date, the state charges interest on the unpaid amount. Interest rates vary by state but typically run 5 to 10 percent per year, calculated daily. On top of interest, you face a penalty — usually 5 to 25 percent of the unpaid tax, depending on how late you are and whether it is your first offense.
A payment that is one day late triggers both interest and penalty. A payment that is 30 days late costs much more. If you do not pay for several months, the state may file a lien against your business or personal assets, or suspend your business license. Some states can garnish your bank account or take money from your tax refund.
If you realize you will miss a deadline, contact the state revenue department before the due date. Many states will work with you on a payment plan if you ask in advance. Waiting until after the deadline makes negotiation much harder. If you genuinely cannot pay the full amount, paying something on time is better than paying everything late.
Sales Tax for Online and Multi-State Sales
If you sell online or ship to customers in other states, you may owe sales tax in states where you do not have a physical location. This rule changed significantly after 2018 and continues to shift. Most states now require online sellers to collect and pay sales tax if their sales into that state exceed a threshold — commonly $100,000 or 200 transactions per year.
Each state sets its own threshold and its own tax rate. A product that is taxable in one state may be exempt in another. You need to know the rules in every state where you have customers. Many online sellers use sales tax software (like TaxJar, Avalara, or Vertex) that tracks sales by state and calculates the correct tax rate for each transaction.
If you owe tax in multiple states, you file separate returns and make separate payments to each state on their schedule. This gets complex quickly. If you are new to multi-state sales, contact a tax professional or your state's revenue department for guidance on which states you owe tax in and how to register.
Records You Need to Keep
The state can audit your sales tax records at any time, usually going back three to seven years. You must keep records that show how much tax you collected, what you sold, and what you paid. At minimum, keep sales receipts or invoices, bank statements showing deposits, payment confirmations from the state, and copies of every return you filed.
If you claim exemptions — for example, if you did not charge tax on certain sales because the customer was tax-exempt — keep the exemption certificate or form the customer gave you. Without proof, the state will assume you owed tax and bill you for it plus interest and penalty.
Digital records are fine. You do not need to print everything. But make sure your records are organized and easy to find if an auditor asks. If you cannot produce records, the state can estimate what you owe based on your bank deposits or other evidence, and that estimate is often higher than what you actually collected.
Frequently Asked Questions
Do I have to register for sales tax if my sales are very small?
Yes. Registration is required by law in states that have sales tax, regardless of how much you sell. There is no minimum sales threshold that lets you skip registration. However, some states exempt certain types of businesses or sales, so check your state's rules to see if your specific business is exempt.
What if I collected sales tax but did not send it to the state?
The state will eventually find out, either through an audit or because you did not file a return. You will owe the tax plus interest and penalty. The longer you wait to pay, the larger the penalty grows. Contact your state revenue department and pay what you owe as soon as possible. Voluntary disclosure before an audit starts may reduce the penalty in some states.
Can I deduct sales tax I paid on business purchases from what I owe the state?
No. Sales tax you pay on your own business supplies or inventory is not deductible from the sales tax you collect from customers. However, some states let you claim a small discount on the tax you collected if you pay on time — typically 1 to 5 percent. Check your state's rules.
What if a customer claims they should not have paid sales tax?
If the customer was tax-exempt (for example, a nonprofit or a reseller), they should have given you an exemption certificate before the sale. If they did not, you owe the tax to the state. If they provide the certificate after the fact, you can usually file an amended return to remove that sale from your taxable total, but the process varies by state.
Do I pay sales tax on sales tax?
No. Sales tax is calculated on the sale price before tax. You do not charge tax on top of tax. For example, if an item costs $100 and the tax rate is 8 percent, you charge $8 in tax for a total of $108. You do not calculate 8 percent of $108.