Sales tax on credit card fees works in two directions, and they follow different rules. A surcharge you add to a customer’s bill is treated as part of the sale, so it takes on the same sales tax character as whatever the customer is buying. The processing fee your merchant provider charges you, on the other hand, is a business-to-business service whose taxability depends on your state’s rules for financial and data services. Confusing the two is what gets merchants into trouble.
Sales Tax on Surcharges You Pass to Customers
When you add a credit card surcharge to a customer’s bill, the tax treatment follows the underlying transaction. If the item is taxable, the surcharge is taxable. If the sale is exempt, the surcharge is exempt. The surcharge is part of what the customer pays for the goods or service, so it gets the same tax treatment as the rest of the receipt.
A 3% surcharge on a $100 taxable sale means you collect sales tax on $103, not $100. The surcharge becomes part of gross receipts. Jurisdictions that have addressed this directly confirm that any amount added to a sale as a condition of the transaction, including credit card surcharges, is included in the taxable sales price.
For the surcharge to be recognized as a surcharge during an audit, it has to be separately stated on the customer’s receipt. Bundling it into the listed price without disclosure creates problems. Some jurisdictions also require signage at the point of sale so customers see the fee before they commit.
Returns and Refunds
When a customer returns a taxable item, you reverse the whole transaction, surcharge and tax included. If you refund $103 plus the sales tax you collected on that amount, you deduct the full $103 from gross sales on your next return and reduce the tax remitted accordingly. If the return happens in a later filing period, take the credit on that period’s return instead of amending the original.
Sales Tax on the Fee Your Processor Charges You
The fee your processor charges for handling card transactions is a separate purchase you’re making. Most states exempt financial services from sales tax, which means the interchange fee, the network assessment, and the processor’s markup all pass through without an additional tax layer. In those states, you pay the processing fee and nothing more.
A smaller number of states tax services by default and only exempt them where a specific carve-out exists. In those jurisdictions, payment processing can be swept into a broader category like “data processing” or “electronic services” and become taxable. Some of these states still exempt processing fees when the provider qualifies as a financial institution subject to the state’s bank or franchise tax. The distinction often comes down to who is providing the service rather than what the service does.
If your processor sits out of state and doesn’t collect sales tax on the fee, you may owe use tax on it. Use tax applies when you buy a taxable service from an out-of-state provider that doesn’t collect your state’s tax, and it’s charged at the same rate as sales tax. Check your state’s tax code for how it defines taxable services before assuming you’re exempt.
Where Surcharges Are Prohibited or Capped
Not every state allows credit card surcharges. As of early 2026, roughly four to nine states maintain some form of surcharge restriction, and the count shifts as legislatures act and courts weigh in. No state prohibits offering a discount for cash payment, which produces a similar economic result through different legal mechanics.
Federal law separately prohibits surcharges on debit card transactions nationwide, under the Durbin Amendment to the Dodd-Frank Act. If you surcharge, your point-of-sale system needs to distinguish credit from debit and apply the fee only to credit.
Even where surcharging is legal, the card networks impose their own limits. Mastercard caps surcharges at 4% of the transaction amount, and the surcharge cannot exceed your actual cost of accepting that card brand.1Mastercard. Mastercard Credit Card Surcharge Rules and Fees for Merchants Visa’s cap is 3%. The binding limit is whichever is lower: the network cap or your actual processing cost for that brand. If your effective Visa rate is 2.4%, that’s your maximum Visa surcharge no matter what the network cap says.
Reported penalties for surcharge rule violations range from $50,000 to $1 million depending on severity and duration, and a network can revoke your ability to accept its cards entirely.
Surcharge Versus Cash Discount
The difference between a surcharge and a cash discount matters for both legal compliance and tax calculation, even when the customer’s out-of-pocket cost lands in the same place. A surcharge starts at the listed price and adds a fee for card use, which increases the taxable amount. A cash discount starts at a higher listed price and reduces it for cash payment, which decreases the taxable amount.
Say your product is priced at $100. Under a surcharge model, a cash customer pays $100 and a card customer pays $103, with sales tax applied to $100 and $103 respectively. Under a cash discount model, the listed price is $103, the cash customer gets a $3 discount, and sales tax applies to $103 for the card customer and $100 for the cash customer. The regulatory treatment differs even where the math converges. Surcharges are banned in some states; cash discounts are legal everywhere. Businesses in surcharge-prohibited states sometimes run cash discount programs to reach the same economic result, but the program has to be structured carefully so it isn’t reclassified as an illegal surcharge during an audit.
Federal Income Tax: Deduct the Fee, Report the Gross
For federal income tax purposes, credit card processing fees are an ordinary and necessary business expense, fully deductible under the general rule that lets businesses deduct the costs of carrying on their trade.2Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses That covers interchange fees, assessment fees, gateway fees, and the processor’s markup. The IRS confirms card processing fees are deductible for businesses.3Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet
How you report the numbers is the compliance point. Report your full gross sales before any processing fees come out, then claim the processing fees as a separate expense line. Most processors net their fee out of your deposit. If you sell $10,000 in a month and the processor takes $250, you receive $9,750. Your tax return should show $10,000 in gross revenue and $250 in processing expenses, not $9,750 in revenue. The IRS matches your reported income against 1099-K forms, and those forms report the gross.
The 1099-K Mismatch
Payment processors report your transaction volume to the IRS on Form 1099-K. For payment card transactions, there is no minimum threshold. Every dollar processed gets reported. For third-party settlement networks like PayPal or Venmo, reporting kicks in above $20,000 in payments and 200 transactions in a calendar year.4Internal Revenue Service. Publication 1099 General Instructions for Certain Information Returns – 2026 Draft
The 1099-K shows gross transaction volume before fees. That’s where audit discrepancies start. If your 1099-K says $120,000 and your return shows $116,000 because you mentally netted out $4,000 in processing fees, the IRS sees a $4,000 gap and sends correspondence. Report the full $120,000 and deduct the $4,000 separately.
For sales tax, the same gross-basis principle applies, but there’s no deduction. You owe sales tax on the full amount the customer paid, surcharge included. The processor skimming its fee before depositing the balance doesn’t reduce your sales tax obligation. The tax is calculated on what the customer paid, not on what lands in your bank account.
What Getting It Wrong Costs
Underreporting gross receipts by netting processing fees before reporting can trigger a 20% accuracy-related penalty on the underpaid tax, plus interest from the original due date.5Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty6Internal Revenue Service. Accuracy-Related Penalty
On the sales tax side, leaving surcharges out of taxable gross receipts means you under-collected and under-remitted. State tax authorities assess penalties and interest on the shortfall at rates that vary by jurisdiction. Some states add negligence penalties on top of the tax owed, and repeated under-remittance can escalate into fraud investigations.
Card network violations carry their own costs. Surcharging above the cap, surcharging in prohibited states, surcharging debit cards, or failing to disclose the surcharge properly can draw network fines from $50,000 up to $1 million. Those fines flow through the acquiring bank to you, and the bank may terminate the processing agreement. For most businesses, losing the ability to accept cards is a worse outcome than the fine.
Keep monthly processor statements, gateway invoices, and bank records showing the deposits and fee deductions for at least three years from the date you filed the return claiming the deduction.7Internal Revenue Service. What Kind of Records Should I Keep8Internal Revenue Service. How Long Should I Keep Records If you surcharge, keep records tying each surcharge to its underlying transaction and showing the surcharge was separately stated on the receipt.