Credit Card Surcharge Calculator

How much you may add to a card sale, what the customer pays, and what you keep after fees

Updated 2026-10-01

Sale amount before surcharge

Processing rate

Fixed fee per transaction

Surcharge cap

Surcharge you may add: $3.00 (3.0%)
Customer pays: $103.00
You keep after fees: $99.71
Fee without a surcharge: $3.20 (3.2%)
Surcharge to cover the fee fully: $3.30 (3.30%)
Fee still not covered: $0.29

The allowed surcharge is the lower of your cost of acceptance (the fee as a share of the sale) and the cap. Card-network rules bar surcharges on debit and prepaid cards, and some states restrict them, so check before you add one.

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A surcharge passes some of the card fee on to the customer, but two things catch merchants out. The processor charges its percentage on the surcharge too, so adding exactly your rate does not cover the fee. And the card networks cap what you may add at the lower of your actual cost of acceptance and a fixed limit (3% for Visa in the US). Enter the sale and your rates to see the surcharge you may add, what the customer pays and what you keep.

Worked example: a $100 sale at 2.9% + 30¢

Without a surcharge, the processor takes 2.9% × $100 + $0.30 = $3.20, which is 3.20% of the sale: your cost of acceptance. To keep the full $100 you would have to charge $100.30 ÷ (1 − 0.029) = $103.30, a 3.30% surcharge, because the fee applies to the surcharge as well.

The cap allows only the lower of 3.20% and 3%, so the surcharge is $3.00. The customer pays $103.00, the fee on that is $3.29, and you keep $99.71. A surcharge of just 2.9% ($2.90) would have left you $99.62.

Allowed surcharge at 2.9% + $0.30 with a 3% cap
Sale	Fee without surcharge	Allowed surcharge	You keep
$20	$0.88 (4.40%)	$0.60 (3%)	$19.70
$100	$3.20 (3.20%)	$3.00 (3%)	$99.71
$500	$14.80 (2.96%)	$14.80 (2.96%)	$499.57

Rules to check before you surcharge

Surcharging is a card-network rule as much as a pricing decision. In the US, the main conditions are:

Credit cards only: card-network rules do not allow surcharges on debit or prepaid cards, even when run as credit
The cap: no more than your cost of acceptance, and no more than 3% on Visa
Notice: tell your processor (and the networks, where required) before you start, usually 30 days ahead
Disclosure: a sign at the entrance and at checkout, and the surcharge shown as its own line on the receipt
State law: a few states restrict or prohibit surcharges, and rules change, so confirm yours first

Surcharge, cash discount or higher prices?

A cash discount (posting card prices and taking a little off for cash) is permitted more widely than a surcharge and is often easier to explain at the counter. Some businesses simply build card costs into their prices, which avoids signage and rules altogether: the price increase calculator shows how small a rise covers a 3% fee. The card processing fee calculator shows what your current rates cost per month.

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Frequently asked questions

How do I calculate a credit card surcharge?

Multiply the sale by the surcharge percentage you are allowed: the lower of your cost of acceptance (fee ÷ sale) and the cap. At 2.9% + $0.30 on $100 the fee is $3.20 (3.20%), so with a 3% cap the surcharge is $3.00.

How much can I surcharge for credit cards?

In the US, no more than your cost of acceptance and no more than 3% for Visa. Other networks set their own caps, and some states limit or ban surcharges, so check your processor agreement and state law.

Why does a 2.9% surcharge not cover a 2.9% fee?

Because the processor charges its percentage on the whole amount, including the surcharge, and adds the fixed fee. To keep the full sale you would need (sale + fixed fee) ÷ (1 − rate), which is $103.30 on a $100 sale at 2.9% + 30¢.

Can I add a surcharge to debit card payments?

No. Card-network rules do not allow surcharges on debit or prepaid cards, even if the customer chooses credit at the terminal. A cash discount is the usual alternative.

Do I have to show the surcharge on the receipt?

Yes. The surcharge must be disclosed before payment and shown as a separate line on the receipt.

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