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Neither pricing model is always cheaper. Flat-rate processing trades some potential savings for a short, predictable bill. Interchange-plus exposes the card network cost and adds a stated processor margin; it can cost less when your volume is steady, your card mix qualifies for relatively low interchange, and the markup and pass-through fees are competitive. The right choice comes from comparing your own recent transactions, not from an advertised percentage.
What the two pricing models mean
Flat-rate (blended) pricing
A flat-rate plan combines the underlying card costs, the processor’s margin and usually some transaction charges into one posted rate or a small set of rates. You may see separate rates for in-person, online and manually entered payments, but each category is intended to be easy to predict.
The New Zealand Commerce Commission describes blended pricing as offering certainty of costs. That predictability is valuable when monthly sales fluctuate, employees need a simple explanation of fees, or the plan bundles software and support that would otherwise be separate line items.
Interchange-plus (unblended) pricing
Interchange-plus lists the applicable interchange fee for each transaction and adds the processor’s markup. The interchange component is set by the card network and depends on the card, merchant category, transaction data and channel. The processor then adds a percentage, a per-transaction amount, or both.
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Visa describes interchange reimbursement fees as transfers between acquiring banks and issuing banks for each card transaction. A merchant normally pays its acquiring institution a merchant discount, which is calculated from the transaction amount and the costs passed through by the acquirer. Mastercard likewise says interchange is only one component of the merchant discount rate and that qualification depends on factors such as merchant category, the time between authorization and clearing, transaction data and sales volume.
The Commerce Commission says unblended pricing is often cheaper for most businesses but less certain to predict. That is a useful generalization, not a guarantee: a high markup, expensive add-ons or a card mix dominated by costly rewards and commercial cards can erase the advantage.
Why the same business can pay different rates
Card mix
Debit, basic consumer credit, rewards credit, commercial and international cards can qualify for different interchange categories. A debit-heavy retailer may have a very different underlying cost from a consultancy that receives mostly premium rewards or corporate cards. The share of each category matters more than the headline rate on a sales page.
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Card-present transactions authenticated at a terminal generally qualify under different rules from online or card-not-present payments. Online transactions carry different fraud and data requirements, and a quote that looks attractive for a shop counter may be less competitive for an online store. Ask for separate pricing for in-person, online, keyed and recurring payments if you accept more than one channel.
Average ticket and transaction count
A fixed cents-per-transaction charge is a larger percentage of a small sale. For example, $0.10 on a $5 purchase equals 2% before any percentage fee; the same $0.10 on a $100 purchase equals 0.1%. Conversely, a percentage markup has a larger dollar impact as your average ticket and monthly volume rise.
Qualification and settlement behavior
Networks can apply a more expensive category when required transaction data is missing, when a transaction is settled outside the permitted authorization window, or when the payment type does not meet the category’s conditions. Mastercard says its interchange tables are generally updated twice a year. The category shown on your actual statement is therefore more useful than a generic rate example.
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What you are really comparing on a statement
Do not compare only the advertised percentage. Build a complete monthly cost for each proposal.
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| Cost component | What to look for | Why it changes the result |
|---|---|---|
| Interchange or blended rate | Network pass-through by card and channel, or one bundled rate | It is usually the largest variable cost, but not the entire bill. |
| Processor markup | Percentage, per-transaction fee, or both; confirm whether it is fixed or negotiable | A small markup becomes significant at high volume. |
| Network or scheme assessments | Separate pass-through assessments and any processor uplift | They may be excluded from a quoted percentage. |
| Monthly and annual charges | Account, statement, platform, support or minimum-processing fees | Fixed charges raise the effective rate when volume is low. |
| Gateway and terminal costs | Online gateway, device rental, software subscription, replacement and shipping fees | A low processing rate can be offset by equipment and gateway charges. |
| Compliance services | PCI program, vulnerability scans or non-compliance fees | These can appear only when a required questionnaire or control is missed. |
| Dispute costs | Chargeback fee, representment fee and optional dispute-management tools | Frequent disputes can make an otherwise attractive plan expensive. |
| Contract terms | Minimum term, early-termination fee, annual increase and automatic renewal | They affect the cost of changing providers later. |
A bundled plan may include point-of-sale software, reporting, hardware support or dispute tools. Treat those services as part of the price rather than assuming the processing rate alone represents value.
When flat-rate processing is the better fit
Low or irregular volume
When sales are seasonal or unpredictable, fixed monthly fees and statement-level complexity can outweigh a small percentage saving. A single posted rate lets you estimate the cost of a slow month without forecasting every card category.
Small staff or limited accounting time
Flat pricing reduces the number of line items employees must reconcile. If nobody has time to audit network categories, a simpler bill can prevent errors and make cash-flow planning easier.
Several payment channels with a valuable software bundle
A provider may combine checkout software, inventory, receipts, support and hardware in one subscription. Compare the total cost of replacing those functions before rejecting a bundled plan because its processing rate is higher.
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Interchange-plus plans with a meaningful per-transaction markup can be costly when customers make frequent low-dollar purchases. Calculate the cents component as a percentage of your actual average ticket rather than relying on a percentage-only comparison.
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When interchange-plus is more likely to win
Steady, substantial volume
At higher volume, a processor’s percentage markup and any fixed cents fee become large dollar amounts. A transparent, competitive markup can reduce the total even though each statement is more complicated.
Favorable card mix
Businesses that receive a high share of regulated debit or basic consumer cards may have lower underlying interchange than businesses dominated by premium rewards, commercial or international cards. Confirm the mix from a recent statement instead of assuming that your industry average applies.
Ability to audit and negotiate
Interchange-plus rewards a merchant that can export transactions, reconcile statement categories and challenge unexplained fees. Ask the provider to state the markup separately from pass-through costs and to identify every fee that can change.
Limited need for bundled services
If you already have a point-of-sale system, gateway and support process, paying for another software bundle may provide little value. In that case, a lower processing cost with unbundled tools can be easier to assess.
How to compare two quotes step by step
- Use the same transaction month. Give both providers a recent month that includes normal sales, refunds, card-present and online activity. Include total volume, transaction count, average ticket and the percentage of each channel.
- Request an itemized proposal. Require the proposed percentage, per-transaction amount, pass-through assessments, monthly minimums, statement charges, gateway and terminal costs, PCI fees, chargeback fees, software subscriptions and support charges.
- Separate underlying cost from markup. For interchange-plus, ask for the processor’s percentage and cents markup independently. For flat-rate pricing, ask which services and pass-through charges are already included and which can be added later.
- Recreate the bill from your data. Apply the quote to the actual volume and transaction count. Add every fixed charge and the estimated cost of each channel; do not apply an in-person rate to online sales.
- Calculate the effective rate. Divide all monthly processing-related fees by processed volume, then multiply by 100. Include recurring software, gateway, terminal, PCI and statement charges when they are required to accept payments.
- Stress-test the result. Recalculate for a low-volume month, a high-volume month, a debit-heavy mix, a rewards-card-heavy mix and an online-heavy mix. A quote that wins only under one narrow scenario is not clearly superior.
- Review the contract. Check the initial term, termination fee, automatic renewal, annual increases, equipment ownership, minimum processing requirement and the procedure for changing or cancelling services.
- Obtain written answers. Have the provider confirm whether assessments are passed through at cost, whether the markup can change, and which fees apply to refunds, disputes, keyed transactions and recurring payments.
Calculating effective cost with a simple example
Suppose a business processes $80,000 in one month across 2,000 transactions. A flat-rate proposal charges 2.75% with no separately stated monthly fee. Its estimated processing cost is $2,200, producing an effective rate of 2.75%.
An interchange-plus proposal might have underlying interchange and assessments that vary by transaction, a 0.25% processor markup and a $0.10 processor fee per transaction. If the underlying pass-through cost for that month totals $1,600, the markup is $200 and the per-transaction charge is $200. Before any other fees, the total is also $2,000, or 2.50% of volume. Add a $100 monthly statement fee and the effective rate becomes 2.625%.
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Those figures are illustrative, not a market quote. The method is what matters: use your own volume, count, card mix and complete fee schedule. If the same business processes only $10,000, the fixed charges produce a much higher effective rate; if it processes $300,000, the percentage markup becomes more important in dollar terms.
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For covered-issuer electronic debit transactions in the United States, Regulation II permits a maximum interchange fee of $0.21 + 0.05% + $0.01 when the fraud-prevention adjustment applies. The Federal Reserve’s 2024 all-network table reports average debit interchange of $0.34 per transaction plus 0.73% of average transaction value; that table was revised June 10, 2025.
These figures do not describe every merchant or every debit card. The Federal Reserve distinguishes covered from exempt transactions, and the cap applies only within its defined issuer and transaction scope. Your processor may also add assessments, a markup and other fees. Use the figures as regulatory context when checking a debit-heavy quote, not as the rate you should expect on every statement.
Rules also vary by country, card network and merchant category. If you operate outside the United States, ask for the rules that apply in your jurisdiction and contract. Network tables can change; Mastercard says its interchange tables are generally updated semiannually, so a quote should state which table and effective date it uses.
Surcharging and customer-facing pricing
A surcharge can change the economics of either pricing model, but it is not automatically permitted. Visa’s cited guidance says a merchant must notify its acquirer 30 days before beginning a surcharge. Network procedures, consumer-disclosure requirements and local laws can impose additional conditions or prohibitions. Obtain written confirmation from your acquirer and check the rules for every jurisdiction and network you accept before adding a surcharge.
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Operational differences beyond the rate
Predictability versus transparency
Flat-rate pricing gives you a stable planning number but hides how much of each payment goes to the network and how much goes to the processor. Interchange-plus reveals those layers, making negotiation and auditing easier while creating month-to-month variation.
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Accounting workload
A blended statement is usually easier to reconcile. An unblended statement may require mapping card categories, channels and assessments to your sales data. Decide who will perform that review and how often before choosing the lower theoretical rate.
Support and dispute handling
Compare response times, dispute-document tools, fraud controls and hardware replacement terms. A bundled support service can prevent operational losses that do not appear in the processing percentage. Conversely, paying for unused tools can conceal an expensive plan.
Flexibility to change providers
Interchange-plus quotes are often negotiated for a particular volume and mix, while flat-rate plans may be easier to understand but can include software or equipment commitments. Read cancellation and equipment-return terms before signing either one.
Decision matrix
| Business situation | Likely starting point | What to verify |
|---|---|---|
| Low, seasonal or unpredictable volume | Flat-rate | Monthly minimums, recurring software fees and the cents component on small tickets |
| Steady high volume with accounting capacity | Interchange-plus | Markup, pass-through assessments and statement accuracy |
| Mostly debit transactions | Either; model both | Covered versus exempt debit scope, actual debit categories and processor markup |
| Mostly premium rewards or commercial cards | Quote both carefully | Card-category distribution and online versus in-person qualification |
| Online-heavy business | Often interchange-plus if volume supports auditing | Card-not-present rates, gateway charges, fraud tools and dispute costs |
| Small tickets and many transactions | Often flat-rate, but calculate | Per-transaction fees and minimums |
| Business needing an integrated POS and support | Whichever has the lower total value-adjusted cost | Replacement cost of bundled software, hardware and support |
Warning signs in a quote
- The proposal shows one attractive percentage but does not state the per-transaction fee.
- It says assessments are passed through without explaining whether the processor adds a markup.
- It omits online, keyed, recurring or international transactions that make up a meaningful part of your sales.
- It lists a low rate alongside a monthly minimum, annual fee or mandatory software subscription that is not included in the advertised figure.
- It does not identify PCI, gateway, terminal, refund or chargeback charges.
- It refuses to provide an example statement or explain how interchange categories are assigned.
- The contract allows a rate or fee change without a clear notice period or cancellation right.
How to revisit the choice
Requote when your sales channels, average ticket, card mix or volume changes materially. Also review the agreement after network tables or processor markups change, or when a bundled terminal, gateway or software subscription renews. Keep at least one representative statement from each quarter so a new quote can be tested against real transaction categories rather than a single unusually cheap or expensive month.
For an ongoing review, track processed volume, transaction count, average ticket, effective rate, disputes, refunds, fixed fees and the share of each channel. A flat-rate plan that was appropriate during a start-up’s irregular months may become expensive after volume stabilizes; an interchange-plus plan that initially saved money may become burdensome if the business adds many small online orders or loses the staff member who audited statements.
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