Interchange-plus vs flat-rate pricing: how to read card fees and spot overpaying

Flat-rate pricing charges the same percentage and fixed fee on every card payment. Interchange-plus, also called interchange++ or cost-plus, passes through the actual interchange and card scheme fees for each payment and adds a separate provider markup. Tiered pricing sorts payments into price buckets the processor defines. All three contain the same underlying costs; they differ in how much of the split you can see and negotiate. To check whether you are overpaying, calculate your effective rate and ask for the provider's markup on its own.

What is inside a card processing fee?

Every card payment fee has three layers:

Interchange is usually the largest network cost. Visa's US schedule describes interchange as a fee transferred between financial institutions and notes that merchants do not pay it directly; they pay a merchant discount to their own financial institution, which contains it. Visa USA interchange reimbursement fees Stripe's guide to network costs makes the same split: the networks set interchange and scheme fees, interchange goes to the issuer, and scheme fees include items such as authorization and cross-border fees. Stripe: managing network costs

Flat rate, tiered or interchange-plus: what is the difference?

Stripe's pricing policy describes its fees as either blended or interchange-plus. Under blended pricing you pay an agreed fee regardless of the underlying network costs; under interchange-plus it passes network costs through and adds a markup, and may adjust network costs after the event. Stripe pricing policy Adyen describes the same distinction: with blended pricing you are charged the same markup on every transaction and cannot see the cost split, while interchange++ shows the acquirer markup, scheme fee and interchange separately. Adyen: interchange fees explained

Tiered pricing deserves caution. Adyen notes that tier criteria are set by the processor rather than the card network, which limits transparency, and Stripe warns that everyday transactions often get pushed into more expensive tiers. Adyen: card processing fees · Stripe: merchant fees

How do you read an interchange-plus statement?

Expect more lines and some that arrive late. Stripe's guide to its interchange-plus reporting splits fees into its own fees and network costs, with network rows for card scheme fees, non-transactional scheme fees, interchange and discount rates. Two details surprise merchants: per-authorization fees apply to every authorization attempt, including declines, and network costs can arrive weeks after the payment, so a charge processed in May could incur network costs as late as July. Stripe: understanding IC+ fees

That has two consequences. Declines cost money under interchange-plus, which is one more reason to stop retrying declines that will never succeed. And month-end reconciliation needs a way to attach late fees to the original payments, or margin reporting will drift.

Are you overpaying? Work out your effective rate

Your effective rate is total processing fees divided by total card volume for the same period. Take a fictional example: a business processed 50,000 dollars of card payments last month and paid 1,600 dollars in fees across all lines. Its effective rate is 3.2%.

That number alone does not tell you whether the price is fair, because interchange varies by card type, region and how the payment was taken. The useful comparison is the markup. Ask your provider, in writing, for:

1. the markup per transaction, as a percentage and fixed fee, separate from network costs;
2. how scheme fees are passed through, at cost or with a margin;
3. every fee that is not per transaction: monthly, PCI, chargeback, refund, payout and currency conversion fees;
4. how card-present, card-not-present, domestic and cross-border payments are priced.

If a provider cannot separate its markup from network costs, you cannot negotiate the part it controls. Currency conversion deserves its own look; currency choice at checkout explains why.

When does interchange-plus make sense?

There is no universal volume threshold. Interchange-plus tends to pay off when a business has enough volume for the markup to be negotiable, a card mix with low-interchange cards that flat pricing averages away, and someone in finance who will reconcile variable network costs every month. Flat rate tends to win when volume is modest, predictability matters more than the last basis point, or nobody will read the detailed statement.

Model both on your last three months of real payments before you switch, and ask how retroactive network-cost adjustments are reported. The pricing and packaging essay covers the same decision from the provider's side, and authorization rate as a P&L metric explains why acceptance can matter as much as price.

Does regulation cap card fees?

In the European Union, yes for interchange on consumer cards. The European Commission's 2016 fact sheet explains that interchange is capped at 0.2% of transaction value for consumer debit cards and 0.3% for consumer credit cards, and that acquirers must show merchant service charges, interchange and scheme fees separately in contracts. European Commission interchange fact sheet The Commission's later review notes that scheme fees fall outside the regulation and appeared to have increased to a limited extent. European Commission IFR report

Elsewhere, rules differ by country and card type. Check the schedules for your market rather than assuming EU caps apply.

FAQ

Is interchange-plus always cheaper than flat rate?

No. It is more transparent, and often cheaper at volume with a favourable card mix, but a high share of premium, commercial or cross-border cards can make it cost more than a blended rate.

What is interchange++?

Another name for interchange-plus: interchange plus scheme fees plus the provider's markup, each shown separately.

Why do I pay fees on declined payments?

Under interchange-plus, networks can charge per authorization attempt, including declines. Flat-rate pricing usually absorbs these into the blended fee.

What is a good effective rate?

It depends on your card mix, region and channel. Compare the provider's markup and fixed fees rather than the headline effective rate.

Can I negotiate interchange?

Not directly; networks set it. You can negotiate the provider's markup and influence interchange through how payments are taken and the data you send.