If you run a retail shop, you already know the feeling. The card statement lands, you skim the total, and somewhere in the back of your mind a question nags at you: Am I paying too much for this?

Most retailers can’t actually answer that, and it isn’t their fault. The way card processing is usually priced is built to be hard to read. A blended percentage here, a “qualified” rate there, a few line items that don’t add up to anything you can check. You end up trusting a number because verifying it would take a finance degree and a free afternoon.

This post breaks down the three pricing models you’re likely to run into, in plain English, and shows why one of them — interchange-plus pricing — is the only one that lets you see exactly what you’re paying and why.

First, what’s actually in a card fee?

Every time a customer taps or swipes, a small slice of that sale gets split up behind the scenes. The biggest piece is interchange — the wholesale cost set by the card networks (Visa, Mastercard, and the rest) and paid to the bank that issued the customer’s card. There are hundreds of interchange rates, and they vary by card type. A basic debit card costs you less. A premium travel-rewards card costs you more, because someone has to pay for those airline miles.

Here’s the key fact: interchange is the same wholesale cost no matter who your processor is. No processor sets it, and no processor can discount it. What changes between processors is the markup they add on top — and how clearly they show it to you.

That single distinction is the whole ballgame.

The three pricing models, plainly

1. Flat-rate (one blended percentage)

You’re quoted a single, tidy number — say, “2.7% per swipe.” Everything gets charged the same percentage, regardless of what the underlying card actually cost the processor.

It’s easy to understand, which is exactly why it’s popular. But “easy to understand” and “easy to verify” are not the same thing. A flat rate bundles the wholesale interchange and the processor’s markup into one figure you can’t pull apart. When a customer pays with a cheap debit card that carried a low interchange cost, you still pay the full blended rate — and the difference quietly becomes margin for the processor.

2. Tiered pricing

Your transactions get sorted into buckets — usually “qualified,” “mid-qualified,” and “non-qualified” — each with its own rate. It sounds organized. In practice, the processor decides which transactions land in which bucket, and the rules are rarely spelled out. Rewards cards, keyed-in sales, and certain card types tend to drift into the pricier tiers. You see three rates instead of one, but you still can’t trace any single charge back to its true cost.

3. Interchange-plus

You pay the actual interchange (the real wholesale cost, passed straight through) plus a clear, fixed markup that doesn’t change from one card to the next. The statement separates the two, so you can see the wholesale cost on one line and exactly what your processor charges on the other.

The difference is transparency. With interchange-plus, the processor’s cut is a number you can read and hold steady. With flat-rate and tiered, that cut is folded into a blend you’re asked to take on faith.

A quick, illustrative example

Let’s walk a simplified month. These numbers are hypothetical and rounded purely to show the mechanics — they are not Payment Collect’s rates and not a quote.

Say you process $50,000 in card sales. Imagine the blended true interchange across all those cards averages out to roughly 1.8% — that’s the wholesale cost, about $900.

	Flat-rate (blended)	Interchange-plus
Quoted to you	2.7% blended	Interchange + a fixed markup
True interchange (wholesale)	~$900 (hidden inside the blend)	~$900 (shown on its own line)
What you pay	$50,000 × 2.7% = $1,350	$900 + a clear, fixed markup
Can you see the markup?	No — it’s baked in	Yes — it’s a separate line

Under the flat rate, you paid $1,350. You have no way to see that roughly $900 of it was wholesale and the rest was markup, because the statement never separates them. Under interchange-plus, the wholesale cost sits on its own line and the markup is right there next to it — visible, fixed, and checkable.

Again: those figures are illustrative. The point isn’t the exact dollars. The point is which model lets you see the math at all.

Why “flat” rates tend to creep

Flat and tiered pricing share a quiet problem: because the markup is hidden inside a blend, it can move without you noticing.

A few things tend to happen after the honeymoon period:

• Your card mix shifts. As more customers pay with premium rewards cards, the true interchange behind your sales rises. With interchange-plus you’d see that pass through transparently. With a blended rate, you just feel the squeeze without an explanation.
• Quiet repricing. A blended number can be nudged up a few tenths of a percent, buried in a statement message or a fine-print notice. On $50,000 a month, a quarter-point you never agreed to is real money — and it’s nearly invisible when there’s no wholesale baseline to compare against.
• Tier reshuffling. On tiered plans, transactions can drift into pricier “non-qualified” buckets over time, raising your effective rate without any single number on the statement obviously changing.

None of this requires anyone to lie to you. It just requires a pricing model where the true cost is hidden — and both flat-rate and tiered fit that description.

What interchange-plus gives a retailer

When the wholesale cost and the markup are split apart, a few good things follow:

• You can verify your bill. The interchange line is the card networks’ published cost. The markup is your processor’s fixed number. Two parts you can actually check.
• Repricing has nowhere to hide. If the markup ever moves, you’d see it, because it’s its own line — not blended into a fog.
• Your savings show up honestly. When your card mix is favorable, lower interchange flows straight to you instead of padding someone’s blend.

Transparency isn’t a feature you frame on the wall. It’s just knowing what you pay.

Where Payment Collect stands

We’ve spent 13 years doing retail POS and payment processing the straightforward way, right here in Asheville. Our pricing is interchange-plus — the real wholesale cost set by the card networks, plus a clear, fixed markup. No blended fog, no mystery tiers.

A few things we hold to:

• We don’t raise rates on existing merchants. The number you start with is the number you keep.
• One vendor for the whole stack — merchant account, gateway, terminal, and POS — so there’s one bill and one team to call.
• Real US humans answer the phone when you have a question about that bill.
• We’ll beat a competing quote, and we’ll show you why your current setup may be costing more than you think.

The honest test isn’t our word — it’s your own statement. Send it over and we’ll read it line by line, show you the true interchange underneath, and tell you plainly whether you’re overpaying. No jargon, no pressure.

See how transparent interchange-plus pricing works, then book a statement review and we’ll walk through your numbers together.

You shouldn’t have to guess what you pay to accept a card. With the right model, you don’t have to.