Gross sales do not include sales tax — they are the amount before tax is added
Gross sales is the total dollar amount your customers paid you for goods or services, before you subtract any sales tax you collected. Sales tax is money you collected on behalf of the state or local government, not money you earned. When you report gross sales on your tax return or to your accountant, you report the pre-tax amount.
This matters because the IRS and state tax agencies want to see what you actually sold, separate from the tax you collected. If you mix them together, your tax liability and your business income both become wrong. Most point-of-sale systems and accounting software keep these numbers separate automatically, but if you track sales by hand or use a basic spreadsheet, you need to know the difference.
Key Takeaways
- Gross sales are the revenue before sales tax is added, and this is what you report on your tax forms and to your accountant.
- Sales tax collected is a liability you owe to the state or local government, not part of your business income.
- If you accidentally include sales tax in your gross sales figure, your reported income will be too high and your tax bill will be overstated.
- Your point-of-sale system or accounting software should separate gross sales from collected tax automatically, but you should verify the split is correct.
Why the IRS separates gross sales from sales tax
The IRS treats sales tax as a pass-through liability. You collect it from customers, hold it temporarily, and send it to the state or local tax authority on a schedule they set — usually monthly or quarterly. The money was never yours to keep, so it should not be counted as your income.
When you file your federal income tax return (Schedule C if you are a sole proprietor, or the appropriate form for your business structure), you report gross sales without the tax. This number becomes your starting point for calculating taxable income. If you included sales tax in that number, you would be reporting income you do not actually get to keep, which would inflate your federal tax bill.
State tax agencies have the same concern. When you file a sales tax return with your state, you report gross sales separately from the tax you collected. This lets them verify that the tax rate you used was correct and that you did not underreport sales.
How to separate gross sales from sales tax in your records
If your point-of-sale system or accounting software generates reports, look for a line item labeled "subtotal," "pre-tax sales," or "gross sales." That is the number you use. The sales tax collected should appear on a separate line.
If you use a spreadsheet or manual records, create two columns: one for the sale amount before tax, and one for the tax collected. When a customer buys something for $100 and you collect $8 in sales tax, record $100 in the gross sales column and $8 in the tax column. At the end of the month or quarter, add up each column separately. The gross sales total is what goes on your income tax return.
If you have already mixed the numbers together and are not sure how to separate them, you can work backward. If you know the sales tax rate in your area (usually 6% to 10%, but it varies by state and locality), you can divide your combined total by (1 + the tax rate). For example, if your combined total is $10,800 and your tax rate is 8%, divide $10,800 by 1.08 to get $10,000 in gross sales. The difference ($800) is the tax you collected.
What happens if you report gross sales with tax included
If you accidentally report gross sales that include sales tax, your reported business income will be higher than it should be. This triggers a higher federal income tax bill and possibly a higher state income tax bill, depending on your state.
You may also face a mismatch when you file your sales tax return. Your sales tax return will show the actual tax you collected and sent to the state. If your income tax return shows higher gross sales (because it included tax), the two numbers will not line up, and a tax auditor reviewing both returns may ask you to explain the difference.
The good news is that this is usually fixable. If you catch the error before you file, you can correct it. If you filed already and realized the mistake later, you can file an amended return for the year in question. The IRS form is 1040-X for individual returns; for business returns, the form depends on your business structure.
Sales tax on different types of transactions
Not all sales are subject to sales tax, and the rules vary by state and by what you are selling. Groceries, prescription medications, and some services are often exempt. If you sell both taxable and non-taxable items, your point-of-sale system should track them separately.
For your gross sales figure, include all revenue from sales of goods and services, whether or not sales tax applied to that particular sale. Gross sales is about what you sold, not about what was taxed. The sales tax line is where you show only the tax you actually collected.
If you sell across state lines or to customers in multiple states, some states may not explore tax to your sales, or the rate may differ. Your accounting software can usually be set up to explore the correct rate by customer location. The key is to keep the pre-tax sales amount separate from whatever tax was collected, regardless of the rate.
Reconciling your sales records with your tax returns
At the end of the year, your gross sales figure should match across three places: your point-of-sale or accounting records, your federal income tax return, and your state sales tax return. If the numbers do not match, find the discrepancy before you file.
Start by pulling a sales summary from your accounting system for the full year. This should show gross sales (before tax) and total sales tax collected. Then check your federal return to confirm the gross sales number appears there. Finally, check your state sales tax return to confirm the same gross sales number and the tax collected amount are reported.
If you use a tax preparer or accountant, give them access to your sales records early. They can spot mismatches and help you correct them before filing. If you prepare your own return, take the time to verify these three numbers match — it is one of the most common sources of errors on small business returns.
Frequently Asked Questions
Should I include sales tax when I calculate my business profit?
No. Profit is calculated from gross sales (before tax), minus your business expenses. Sales tax collected is not part of profit because it was never your money — you collected it on behalf of the government. Your accounting software should calculate profit using only the pre-tax sales amount.
What if a customer paid me in cash and I did not keep a receipt?
You still need to report the sale. If you remember the amount before tax, record that as gross sales. If you only remember the total amount the customer handed you (including tax), use the calculation method described above to back into the pre-tax amount. Keep whatever documentation you have, in case you are asked about it later.
Do I report gross sales before or after refunds?
Gross sales should reflect actual sales that went through. If you issued a refund, subtract it from your gross sales for that period. If the customer paid sales tax and you refunded the full amount including tax, reduce both your gross sales and your sales tax collected by the appropriate amounts.
Does gross sales include tips or service charges?
Tips are not part of gross sales — they are separate income to the employee who received them. Service charges that you add to a bill (like an automatic gratuity at a restaurant) are part of gross sales if they are your revenue. Sales tax may or may not explore to service charges depending on your state, but either way, the service charge itself goes in gross sales, and any tax on it goes in the tax column.
What if my state does not have sales tax?
If you operate in a state with no sales tax, your gross sales and your total revenue are the same number — there is no tax to separate out. You still report gross sales on your federal return the same way. If you sell to customers in other states that do have sales tax, you may need to collect and remit tax on those sales depending on your state's rules and where your customers are located.