Key Takeaways:
- The merchant discount rate (MDR) is the total percentage fee a business pays to accept a credit or debit card payment.
- MDR fees typically run between 1% and 3% and cover fees to the issuing bank, the card network, and the payment processor.
- Only one part of the fee is negotiable. Interchange and assessment fees are fixed by the card networks, but your processor’s markup is something you can shop and negotiate.
The merchant discount rate is the fee deducted from every card payment you accept. For most retailers, it runs between 1% and 3% of each sale, and it comes out before the money reaches your bank account. Across all US merchants, the average fee on Visa and Mastercard transactions was 2.36% in 2025.
Most store owners know roughly what they pay but have never broken it down. That matters because the rate has three separate parts, and only one of them is negotiable. This post explains each part, how to find your real rate, and what you can do to bring it down.
Merchant Discount Rate Definition
The merchant discount rate is the total cost of processing a card payment. It includes the interchange fee paid to the customer’s bank, the assessment fee paid to the card network, and the markup your payment processor charges for handling the transaction.
It comes out as a percentage of each sale. You never receive an invoice for it. The processor simply deposits your sale amount minus the fee, which is why many retailers underestimate what they are actually paying.
The Word “Discount” Is Misleading
The term does not mean you are getting a deal. It comes from old banking language, where a bank would buy a payment at a discount from its face value. The bank paid you less than the full amount and kept the difference. You were the one offering the discount, not receiving one.
At the register, it works like this: a customer pays $100, you hand over $100 worth of product, and $97.30 lands in your bank account two days later. That $2.70 went to three different parties.
The 3 Parts of a Merchant Discount Rate
Every merchant discount rate is made up of three fees added together.
| Component | Who gets it | Typical size | Negotiable? |
|---|---|---|---|
| Interchange | The bank that issued your customer’s card | 70%–80% of your total rate | No |
| Assessments | Visa, Mastercard, Discover, or Amex | ~0.13%–0.15% of volume | No |
| Processor markup | Your payment processor | Whatever you agreed to | Yes |
Interchange is the largest piece. It goes to the bank that issued your customer’s card and covers fraud risk, transaction processing, and the rewards programs attached to that card. It is set by the card networks and is the same for every merchant. You cannot negotiate it.
Card Type Changes What You Pay
The type of card a customer uses directly affects your interchange fee. A basic debit card costs less than a standard credit card. A premium travel rewards card costs more than both.
That is because the interchange on a rewards card funds the cardholder’s points and miles. The more generous the rewards program, the higher the interchange tends to be. You have no way to know which card a customer will use, but you will see the difference on your monthly statement.
Debit Card Rates Are Capped by Law
Debit interchange is regulated by federal law for cards issued by banks with more than $10 billion in assets. The cap is 21 cents plus 0.05% of the transaction, plus a 1-cent fraud adjustment. It has not changed since 2011, and the Federal Reserve reviewed and left it unchanged again in 2026.
For stores with higher average tickets, regulated debit is cheap. For convenience stores with $3 to $5 sales, the per-transaction structure can make debit more expensive as a percentage than credit. A 22-cent fee on a $4 sale is 5.5%.
Payment processors giving you trouble?
We won’t. KORONA POS is not a payment processor. That means we’ll always find the best payment provider for your business’s needs.
Online Transactions Cost More Than In-Store
Card-not-present transactions, meaning online or phone orders where the customer does not physically swipe or tap, carry a higher interchange than in-store purchases. The reason is fraud risk. When a card is not present, the chance of fraud is higher, and interchange reflects that.
If you take phone orders or run an e-commerce channel alongside a physical store, expect your effective rate on those sales to run higher than what you see at the register.
How to Calculate Your Effective Rate
Your effective rate is your total monthly processing fees divided by your total monthly card volume. It is more accurate than the rate on your contract because it includes all the fees your processor charges. Use our calculator below to run the numbers:
Effective Rate Calculator
Enter your totals from last month’s statement.
Above 3%? Your pricing model or markup may be worth renegotiating.
An example:
Say Dana runs a liquor store that processed $86,000 in card sales last month and paid $2,640 in total fees. Her effective rate is 3.07%, even though her contract shows a 1.79% qualified rate on page one. The gap consists of tiered price downgrades, monthly fees, and PCI compliance charges.
Merchant Discount Rate Pricing Models
The three components of the MDR are always the same, but processors package them differently.
- Interchange-plus pricing shows the interchange and the processor markup as separate line items. You can see exactly what you are paying for each part. This is the most transparent model and usually the most cost-effective at higher volumes.
- Tiered pricing bundles transactions into qualified, mid-qualified, and non-qualified buckets and charges a single rate per bucket. The processor decides which bucket each transaction falls into, and that decision is not disclosed. This is where extra margin tends to hide.
- Flat-rate pricing charges one fixed percentage on every transaction. It is simple and predictable but typically costs more than interchange-plus once monthly volume exceeds around $15,000.
Small Tickets Cost More Per Sale
Per-transaction fees are small in dollar terms but large as a percentage of a small sale.
Take a processor charging interchange plus 0.30% and $0.10 per transaction. On a $60 bottle of wine, that markup adds up to about 28 cents, or roughly 0.47% of the sale. On a $3.50 energy drink, the same markup is 11 cents, or 3.1% of the sale price. Same fee structure, very different cost as a percentage.
The Visa and Mastercard Settlement Explained
In June 2026, a federal judge granted preliminary approval to a $38 billion settlement between Visa, Mastercard, and around 12 million US merchants over credit card swipe fees. If finalized, the settlement would cut credit interchange by 10 basis points for five years, cap standard consumer card rates at 1.25% for eight years, and give merchants the option to decline some premium and commercial card categories.
PRO TIP!
None of these changes is in effect yet. Mastercard has indicated that final approval is expected in late 2026 or early 2027, and that rule changes will follow. Do not switch processors or restructure pricing in anticipation of it.
How to Lower Your Merchant Discount Rate
You cannot reduce interchange or assessments, so the real savings come from three places. Here’s how to lower your merchant discount rate:
- Decide how to handle the cost with customers: Surcharging applies to credit cards only, is banned in California, Connecticut, Maine, and Massachusetts, and requires 30 days notice to your processor. Cash discount programs are legal in all 50 states and are subject to different rules.
- Negotiate your processor markup: Get interchange-plus quotes from two or three processors and compare only the markup line. The interchange underneath is identical regardless of who you use.
- Reduce transaction downgrades: Close out your batch at the end of every day, keep your terminal software up to date, and enter the customer’s billing address and CVV on any transaction where the card is not physically present.
Learn more about how credit card processing works and save your business money with this free eGuide.
How Your POS System Affects Your Rate
Your POS does not set your merchant discount rate, but it determines whether you can shop for a better one. A system with bundled payment processing locks you into one processor. If you want to switch, you often have to replace your entire setup.
KORONA POS is processor-agnostic, meaning you can connect it to multiple processors and switch without changing your hardware, inventory data, or reporting. When Marcus, a convenience store owner and KORONA POS client, found a processor offering a 0.15% lower markup, all the change required was a settings update, not a replacement for his equipment.
Wrapping Up: What Should You Check on Your Next Statement?
The merchant discount rate is not one fee. It is three fees bundled together and deducted from every card sale before the money reaches your account. Two of those fees are fixed. One is not.
Pull last month’s merchant statement. Find your total fees charged and your total card volume. Divide fees by volume. That is your effective rate, and it is more accurate than anything printed on page one of your contract. Then find the markup. That is the only number on the page anyone will negotiate with you, and knowing it is the difference between a vague sense that fees are too high and a specific conversation you can win.
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Frequently Asked Questions
Is the merchant discount rate the same thing as interchange?
No. Interchange is one component of the merchant discount rate. Your MDR is interchange plus network assessment fees plus your processor’s markup.
What is a good merchant discount rate for a small retail store?
For an in-person store with a mix of debit and credit, an effective rate between 2.2% and 2.6% is typical. Above 3% usually points to tiered pricing, an inflated markup, or a high volume of downgraded transactions.
Can I pass my merchant discount rate on to customers?
Yes, with conditions. Surcharging is permitted in most states but applies only to credit cards, not debit or prepaid. Cash discount programs are allowed in all 50 states. Talk to your processor and a local attorney before setting either up.
Why did my rate go up when nothing changed in my store?
Card networks update interchange rates twice a year, usually in April and October. If your customers are using more premium rewards cards over time, your average rate goes up even if nothing else changes. Your processor may also have raised its markup, which many contracts allow.
Why is it called a discount rate if nothing is discounted?
The term comes from old banking practice. A bank would buy a payment at a discount from its face value and keep the difference. You are the one offering the discount, not receiving one.
Do I pay a merchant discount rate on debit card transactions?
Yes. Regulated debit carries a lower capped interchange fee, but you still pay network assessments and your processor’s markup on top of that.
