What Is Dual Pricing and How Is It Different from Cash Discount?
Fri Oct 16 2026
A new shop owner sets up card payments in an afternoon, sees one number on the screen, and gets back to work. Six months later, a few $8 sales and a busy weekend make her wonder why the card fees feel bigger than the rate she was quoted.
Flat rate credit card processing is the simplest way to start, and it works well in the right conditions. It also has a point where it stops being the cheapest option.
Quick Answer: Flat rate credit card processing charges one blended rate, usually a percentage plus a few cents per sale, no matter which card the customer uses. It is a good fit for new shops, low or unpredictable volume, and owners who want one number to remember. It tends to cost more as monthly card volume grows or when you have a mix of low-cost debit cards, so compare it with interchange-plus pricing once your volume is steady. Rates vary by merchant category, card type, and processing volume.
What Is Flat Rate Credit Card Processing?
Flat rate credit card processing means you pay one set rate on every card sale, whether the card is debit, standard credit, or a premium rewards card. The rate usually has two parts: a percentage of the sale plus a fixed fee per transaction, such as a few cents.
The provider bundles three costs into that one number:
Interchange: The fee set by the card networks and paid to the bank that issued the customer's card
Assessments: A small fee charged by the card networks
Provider markup: The part your processing partner keeps
You do not see them separately, which is why flat rate is easy to understand and harder to compare. Published in-person flat rates from major providers commonly land somewhere around 2.3% to 2.9% plus a few cents, according to the 2026 guides reviewed for this article. Your rate may differ.
How Much Does Flat Rate Cost on a Small Sale?
On small tickets, the fixed fee does more work than the percentage. The smaller the sale, the higher your real cost as a share of that sale.
Here is an illustrative example using a rate of 2.6% plus 15 cents. It is not a quote.
Sale amount | Fee | Real cost as a % of the sale |
$8 | $0.36 | 4.5% |
$25 | $0.80 | 3.2% |
$60 | $1.71 | 2.85% |
An owner who sells a lot of coffee, treats, or add-ons at under $10 feels this the most. If your average ticket is small, the cents matter as much as the percentage, and some providers offer a percentage-only structure with no per-transaction fee that may fit small tickets better.
When Does Flat Rate Make Sense for a Small Shop?
Flat rate fits when simplicity is worth more to you than the lowest possible cost. It tends to work best in a few situations:
You are just opening: You do not yet know your volume or card mix, and one predictable rate is easier to plan around.
Your volume is low or seasonal: At a few thousand dollars a month, the gap between flat rate and other models is often small.
You sell at markets, pop-ups, or from a truck: A portable setup with simple pricing and a short commitment is often a better match than paperwork-heavy options.
You do not want to read a statement: One number is one number.
It is a weaker fit if your average ticket is very small, your volume is climbing, or most of your customers use debit cards. Debit often carries lower interchange, and flat rate averages it away.
At What Volume Does Interchange-Plus Beat Flat Rate?
Sources put the rough switch point anywhere from about $10,000 to $25,000 a month in card sales, and none of those numbers is a rule. The honest answer depends on your average ticket and card mix, so run your own math.
Here is a side-by-side with illustrative figures. Interchange-plus is estimated at interchange of 1.65% plus $0.10, an assessment of 0.14%, and a markup of 0.40% plus $0.10. Flat rate is 2.6% plus $0.15.
$5,000 a month, $20 average ticket | $30,000 a month, $45 average ticket | |
Transactions | 250 | 667 |
Flat rate | about $168 | about $880 |
Interchange-plus | about $160 | about $790 |
Difference | about $8 a month | about $90 a month |
At low volume, the difference is small enough that simplicity may win. At $30,000 a month, the gap is about $1,080 a year in this example. It grows if more of your customers use debit, and it shrinks or reverses if most use premium rewards cards.
Merchants who move from a flat rate to an interchange-plus structure with steady volume often see their effective rate drop, depending on card mix. Interchange-plus also adds more detail to read and sometimes more paperwork.
What Should You Check Before You Accept a Flat Rate Offer?
Ask for the full fee schedule in writing. The headline rate is rarely the whole cost.
The per-transaction fee: Is there one, and does it change for keyed-in or online sales?
Monthly fees: Any minimum, statement, gateway, or software fee
Hardware: Is the terminal bought, leased, or part of a free terminal program, and what are the conditions?
Contract terms: Term length, cancellation fees, and renewal rules
Payout timing and holds: When funds arrive, and whether they can be held
What changes as you grow: Whether you can move to a different pricing model without starting over
A free terminal is never free of conditions. Typical conditions include a processing agreement, a term length, and volume expectations, and terms vary by program. Read them before you sign.
Is Flat Rate the Same as Dual Pricing or Cash Discount?
No. Flat rate is a processing model for how your provider charges you. Dual pricing, cash discount, and surcharge are pricing programs that change what your customers see and pay.
Those programs have their own disclosure and signage rules, and availability depends on your state and your processor. Surcharging is prohibited in Connecticut, Maine, and Massachusetts, for example. None of them is right for every shop, so confirm your state and your processor's rules before you try any of them.
Rapid Payments is a merchant services partner and ISO that works through multiple processor partners. That means a small shop can compare flat rate, interchange-plus, and other pricing options side by side instead of getting one provider's offer.
Availability depends on the processor, merchant category, and approval. Once you become a client, a dedicated consultant reviews your setup and stays available as your shop grows.
If you are not sure whether flat rate is still the right fit for your shop, Rapid Payments will review a recent statement and walk through your options with you. Reach out for a no-pressure fee comparison and a clear picture of what a different setup would cost your business.
