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Profit impact calculator

Card processing fees take a far bigger share of profit than of revenue. A 3% fee on a business with a 10% margin consumes 30% of profit before processing costs. Effective Rate measures fees against your margin, because that is where every saved basis point lands.

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How much are card processing costs reducing my profit?

Enter card sales for a month or a year, your profit margin before processing costs, and either your effective rate or your total fees in dollars.

Measure fees in profit terms

Use card sales and margin for the same month or year.

Card sales period

Total processing fees divided by card sales.

Fill in your sales, margin, and rate, then press the button. The share of profit appears here.

Share of profit taken by fees

Effective Rate illustration: processing fees as a share of profit before processing costs.
Profit marginAt 2.0% rateAt 2.5% rateAt 3.0% rate
10%20%25%30%
20%10%12.5%15%
30%6.7%8.3%10%

Why profit is the right lens

Fees scale with sales, not with profit

A processor takes its percentage from the full ticket, whether the sale earned you a lot or almost nothing. Low-margin sellers, such as many ecommerce stores, feel this most: the same rate that looks small against revenue can be a large slice of what the business actually keeps.

Savings drop straight to the bottom line

Any reduction in processing cost needs no extra marketing, inventory, or staff. That makes it one of the few expense lines where improvement flows directly into operating profit, which is why Avendo focuses on keeping eligible processors competing on each online transaction.

See how that profit change can affect what the business is worth in the business value calculator, or start over with the credit card processing cost calculator.

Common questions

Why measure processing costs against profit instead of revenue?
Processing fees come out of profit, not revenue, so their real weight is larger than the rate suggests. A business paying 3% on card sales with a 15% margin before processing costs gives up 20% of that profit to fees. The profit impact calculator on this site shows that share for your own sales and margin.
Is accepting credit cards worth it for a small business?
For most small businesses, and for nearly every online store, accepting cards is necessary because online customers cannot pay in cash. The better question is how much you pay to accept them. Measuring your effective rate and keeping processors competing on price helps a small business accept cards without giving up more margin than it needs to.
How can I reduce the impact of credit card processing fees?
Measure fees against profit, then act on the part you control: the markup. Know your effective rate, review it regularly, and avoid long stretches where pricing goes unchallenged. Avendo was built around this problem; co-founder Victor Popovics found that once pricing was set with one processor, there was little opportunity to revisit it without renegotiating or moving.
Why are credit card processing fees so high?
Fees feel high because most of the cost is interchange that merchants cannot negotiate, and the markup on top often stays fixed once a business signs with one processor. US merchants paid a record $198.25 billion in card fees in 2025. Without ongoing competition on the markup, there is little pressure for a single processor to lower it.
How much does Avendo cost merchants?
Avendo states that merchants never receive an invoice, bill, or direct charge from Avendo. Its compensation is an Avendo Services Fee of 10 cents per transaction, billed to the payment processor. Merchants still pay card processing costs through their processor, including interchange and assessment fees set by Visa, Mastercard, American Express, and Discover.

Read all 44 answers on credit card processing costs

Could you keep more of that profit? Ask Avendo.

Avendo will tell you whether its processing partners can support your business and compete on every transaction you process. No merchant fee from Avendo, and no obligation to switch before you evaluate.