To compare restaurant POS interchange-plus vs. flat-rate pricing, apply each written quote to the same card sales, transaction counts, and card mix. Then add the fixed processing fees and any other charges included in the quote. The cheaper model is the one with the lower expected total for your restaurant—not necessarily the lower headline percentage.
Start with a representative processing statement. Separate in-person and online payments if the quotes price them differently, and check whether refunds, chargebacks, and other exceptions appear on the statement. The owner or manager reviewing the quotes needs a clear monthly comparison before signing or changing the payment setup.
Set the same boundaries for both quotes
A flat-rate quote usually applies a stated percentage and sometimes a fixed amount per transaction. Interchange-plus pricing typically passes through interchange costs and adds a processor markup, which may include both a percentage and a per-transaction amount. The actual interchange cost can vary with the card and transaction type. Ask each provider to define its terms in writing rather than assuming all quotes use the same formula.
For each quote, identify the sales volume and number of transactions it covers. A busy counter with many small checks can pay a meaningful amount in per-transaction fees. A dining room with fewer, larger checks may be more affected by the percentage rate. Sales are the amounts guests pay; processing fees are the charges for handling those payments. They are not the same measure.
Request a breakdown for each payment channel you use: card-present, online, and manually keyed payments, as applicable. Ask how tips, refunds, voids, chargebacks, and settlement adjustments affect the calculation. Confirm whether monthly minimums, gateway charges, statement fees, and other fixed processing charges apply. If a fee is conditional, note what triggers it.
Keep subscription, hardware, delivery, and other nonprocessing costs outside this comparison unless a quote bundles them and the provider cannot separate them. Those costs still matter to the overall buying decision, but mixing them into an unlabeled processing rate makes the payment models harder to compare. The guide to payments, processing cost, cash close and POS reports offers a broader view of the operating costs around the POS.
Put the quote into the service workflow
The office calculation should match what happens at the counter, at the table, and during close. Ask each provider to walk through the payment types your staff actually handle. For example, a cashier may take a card-present payment at a terminal, while a manager reviews the batch and an online order arrives through a separate channel. Each route needs a clearly quoted rate and a report that lets the manager reconcile it.
Use the same requirements sheet with every vendor. Toast lists restaurant POS, hardware, online ordering, payments, KDS, and integrations. Square offers restaurant point of sale and related payment and order tools. Fleksa offers restaurant POS connected with direct ordering, reservations, and related tools. Those descriptions do not establish that any particular processing rate or workflow is available in your setup.
For each provider, ask for a demonstration of the relevant device, staff role, and payment state. Can the cashier see the payment amount and outcome? Can an authorized manager identify a refund and find the associated fee treatment? Can the person closing the day distinguish gross card sales, refunds, fees, and the deposit? A deposit is the amount settled to the restaurant after the provider’s adjustments; it should not be treated as either gross sales or fees by itself.
Also ask which plan, processor, gateway, or device is required for the quoted workflow. Record any unavailable function or dependency next to the quote. Confirm whether rates differ by channel and whether a change in processor affects the setup. Ask for contract duration, cancellation terms, and processor restrictions in writing. If connectivity is a concern, ask exactly what staff can and cannot do when a connection is lost; do not assume offline payments are available.
Check whether your existing POS hardware can be used with the proposed payment setup. Compatibility and any replacement costs need confirmation for the specific devices and processor, not a general promise.
Calculate a monthly comparison with editable counts
The following figures are hypothetical. They show one month of card sales under two made-up quotes, not Fleksa pricing or an estimate for any named provider. The restaurant has 1,000 transactions totaling $18,000. The three card groups represent different assumed interchange rates; the sales amounts within each group are needed because the percentage is charged on dollars, not on transaction counts.
Quote A is a flat 2.7% plus $0.10 per transaction, with a $25 monthly processing fee. Quote B is the assumed interchange rate for each group plus 0.35% and $0.08 per transaction, with a $40 monthly processing fee. Both quotes are assumed to cover the same transactions and no other charges for this example.
| Monthly input | Transactions | Card sales | Assumed interchange |
|---|---|---|---|
| Group 1 | 600 | $9,000 | 1.5% |
| Group 2 | 300 | $6,000 | 2.2% |
| Group 3 | 100 | $3,000 | 3.0% |
| Total | 1,000 | $18,000 | Calculated by group |
The table separates counts from sales so you can replace either without changing the other by accident. Apply the flat percentage to total sales, then add the per-transaction and monthly charges:
- Quote A: $18,000 × 2.7% = $486. Add 1,000 × $0.10 = $100 and the $25 monthly fee. Total: $611.
- Quote B: Interchange is $135 for group 1, $132 for group 2, and $90 for group 3, totaling $357. Add $18,000 × 0.35% = $63, plus 1,000 × $0.08 = $80 and the $40 monthly fee. Total: $540.
On these assumptions, Quote B is $71 less for the month. That difference is not a forecast for another restaurant. A different card mix, average check, channel mix, or fee schedule can change the result.
To edit the worksheet, replace each group’s transaction count, sales, and assumed interchange rate with values from your records or the provider’s written estimate. Recalculate each group’s interchange as sales multiplied by its rate. Add the group results, apply the quoted markup to total eligible sales, multiply the per-transaction charge by the eligible count, and add fixed processing fees. Calculate the flat quote against the same sales and count. If channels have different rates, make a separate calculation for each channel before adding them together.
This example excludes refunds, chargebacks, gateway fees, monthly minimums, POS subscriptions, hardware, and applicable taxes. It also assumes no other adjustments. Add any applicable quoted charges to both models where relevant; do not assume an excluded charge is zero. If a provider cannot give you enough detail to allocate card groups, ask for a written estimate based on your statement and compare its assumptions with the other quote.
Check the reports without charging a guest
Once the math points to a candidate, ask the provider to show how its quoted fees would appear in the payment records and settlement reports. Use a simulated transaction or sample report that cannot initiate a real payment, guest message, or courier dispatch. The goal is to see the fields and workflow, not to produce an actual processing result.
For a simulated card-present sale, the cashier’s expected view should show the sale amount and a payment outcome. A manager’s expected report should identify the payment and show, or make traceable, the gross amount, relevant adjustments, and fees. Ask where a refund appears and whether the report links it to the original sale. If a receipt or report does not show a fee, ask which statement or export supplies it.
Have the person responsible for close compare the sample report with the quote worksheet. Check that the transaction count and sales total are counted once, that percentage and per-transaction charges use the right bases, and that fixed charges are visible or separately documented. Ask how the provider reports a partial refund and a disputed payment, including any additional charge and when it appears.
A simulation confirms what staff can see in a practice scenario; it does not prove how a live settlement will behave. If you later run an authorized live service pilot, agree with the provider on its scope and reconciliation process first. Record actual results only after that authorized pilot, using its real reports and statements.
Set the decision rule and next step
Assign one owner—often the operator or bookkeeper—to keep the worksheet, written quotes, and recent statements together. Set a decision date and compare both offers using the same period. If sales are seasonal, repeat the calculation for a slower and a busier month rather than relying on one average.
Use a simple acceptance rule: the preferred quote must have a lower expected processing total for the selected periods, with the required payment channels covered and the relevant fees explained in writing. It must also provide a report the close owner can reconcile to the statement and deposit. A lower estimate alone is not enough if the rate for an important channel or the treatment of exceptions remains unclear.
If the quotes are too incomplete to compare, the fallback is to request itemized written terms and keep the decision open. Ask a qualified adviser about contract, legal, or tax treatment where needed. For Fleksa plan details, consult Fleksa plans; pricing information was checked in November 2026. Request a current written processing quote for your own transaction mix.
Bring your worksheet, channel list, sample reconciliation questions, and acceptance rule to a restaurant POS system demo. Ask the provider to walk through the simulated sale and close workflow, then give you the terms needed to finish the comparison.
Frequently asked questions
Is interchange-plus always cheaper than flat-rate pricing?
No. The result depends on card mix, transaction size and count, processor markup, fixed fees, and other applicable charges. Calculate both quotes using the same restaurant data.
Should I compare the processing rate or the monthly total?
Compare the expected monthly processing total. Include percentage charges, per-transaction charges, fixed fees, and applicable exceptions. Keep sales and deposits separate from fees.
What if a provider will not estimate my card mix?
Ask it to explain how it would price the transaction categories on your statement and identify any assumptions in writing. If you still cannot calculate a comparable total, leave the quote unresolved rather than treating missing fees as zero.
