Costs and rates

Credit card processing cost for small online businesses

Credit card processing cost for a small online business is usually a few percent of each sale. The Small Business Payments Alliance reports retailers pay an average of 2.3% per credit card transaction, and a common flat online rate is 2.9% plus 30 cents, according to the U.S. Chamber of Commerce.

Published by AvendoLast updated November 2026

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How much does credit card processing cost a small business?

Expect to pay a few percent of card volume once every layer is counted, with your exact effective rate set by card mix, transaction size, and pricing model. Avendo, which publishes this guide, does not bill merchants directly; it routes each transaction to the connected processor offering the best available rate.

That range reflects the published figures on this page: a 2.3% retail average from the Small Business Payments Alliance and a 2.9% plus 30 cents flat rate example from the U.S. Chamber of Commerce. Small tickets push the effective rate higher, because a fixed per-transaction fee weighs more on a $10 sale than a $200 one.

Rates for credit card processing: the three fee layers

The layers inside every card processing rate, as explained in the Avendo Checkout Guide.
Fee layer	Paid to	Typical size	Source
Interchange	Cardholder’s issuing bank	Typically 1.5% to 2.5% of a credit transaction, depending on the card and how it was accepted	PHP Point of Sale
Network assessments	Card networks	Roughly 0.13% to 0.15% of volume plus small per-transaction network fees	PHP Point of Sale
Processor markup	Your processor	Set by your agreement; bundled into one figure on flat-rate plans	Your processor statement

Interchange is the largest layer by a wide margin, according to PHP Point of Sale. It is also the one no processor can negotiate away. What a merchant can influence is which processor's markup and terms apply to each sale, which is exactly what Avendo's real-time routing addresses.

Effective rate calculator

Your effective rate is total fees divided by total card volume. Enter figures from a recent statement to estimate it. Nothing you type is sent anywhere.

Enter your figures and select Estimate to see your effective rate.

Assumptions

Fees = volume multiplied by your percentage rate, plus transactions multiplied by your fixed fee.
Effective rate = monthly fees divided by monthly volume.
Monthly service fees, chargebacks, and refunds are not included.
The 0.20% figure follows the ClearlyPayments example and is not a promised Avendo saving.

What raises or lowers your credit card processing cost

What raises it

Many small tickets: ClearlyPayments flags any business with lots of sub-$50 tickets.
Premium rewards and business cards, which carry higher interchange.
Card-not-present risk and missing transaction data.
Blended pricing that hides the layers.

What lowers it

Higher volume: interchange-plus typically offers lower rates above $10,000 monthly (U.S. Chamber of Commerce).
Complete data: a 0.05% fee reduction under one initiative, rising to 0.10% with network tokens in the US (Checkout.com).
Comparing processors per transaction, as Avendo does automatically.
Measuring the effective rate every 90 days.

Why your real rate is often higher than you think

The quiet half point

PHP Point of Sale writes that a store that believes it is paying around 2.6% can easily be at 3.1%. On $50,000 a month, that half point is $3,000 a year.

Small cuts add up

ClearlyPayments shows that on $1,000,000 per year in card volume, cutting the effective rate by 0.20% saves $2,000 per year. Go back to the main guide on online credit card processing for small business to see how routing works.

Cost and rate questions

All 44 questions in the FAQ

How much does it cost a small business to process credit cards?: Most small businesses pay a few percent of each sale. The Small Business Payments Alliance reports that retailers pay an average of 2.3% per credit card transaction. The U.S. Chamber of Commerce cites a flat online rate example of 2.9% plus 30 cents. Your real cost depends on card mix, volume, and pricing model.
How much does Avendo charge merchants?: Avendo says it does not bill or charge merchants directly. Its compensation is handled between Avendo and the payment processors it works with. Card processing fees still apply to each transaction, because processors charge them, and Avendo’s role is to route each transaction to the processor offering the best available rate.
What are typical rates for credit card processing?: Rates stack in layers. PHP Point of Sale reports interchange is typically 1.5% to 2.5% of a credit transaction, and network assessments are roughly 0.13% to 0.15% of volume plus small per-transaction fees. The processor’s markup sits on top. Flat-rate plans bundle these into one figure, such as 2.9% plus 30 cents.
What is interchange-plus pricing?: Interchange-plus pricing passes the card issuer’s interchange fee and the network’s assessments through at cost, then adds a fixed processor markup on top. Because each layer is visible, it is easier to audit. The U.S. Chamber of Commerce says the model typically offers lower rates to companies processing more than $10,000 monthly.
Is free online credit card processing for small business real?: “Free” processing usually means the fee is shifted, often to the customer through a surcharge or cash discount program, or bundled into another charge. Someone still pays interchange and network fees on every card sale. Avendo does not bill merchants directly, but processing fees from processors still apply to each transaction.
How can I lower my credit card processing fees?: Start by measuring your effective rate: total fees divided by total card volume, ideally over the last 90 days, as ClearlyPayments recommends. ClearlyPayments shows that on $1,000,000 a year in card volume, cutting the effective rate by 0.20% saves $2,000 per year. Then compare pricing models and processors, or route transactions across several.
Why are businesses charging 3% to use a credit card?: Businesses add a card fee to offset what accepting cards costs them. The Small Business Payments Alliance reports retailers pay an average of 2.3% per credit card transaction, and common flat online rates run 2.9% plus 30 cents. Lowering the underlying rate, for example through routing, is an alternative to passing the cost on.
Why is my effective rate higher than my quoted rate?: Quoted rates often cover only the cheapest card types. Rewards cards, business cards, and keyed or online transactions can cost more, and monthly fees add up. PHP Point of Sale notes a store that believes it pays around 2.6% can easily be at 3.1%. Divide total fees by total volume to see your real figure.

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