The right processor is the one that fits how you take payments and produces the lowest reliable effective cost at your volume—not the one with the lowest advertised percentage. Map your in-person, online, keyed, recurring, and international sales; collect itemized quotes; calculate every fee against your real average ticket; then verify integrations, payout and reserve rules, PCI responsibilities, support, and exit terms before signing.
What a credit-card processor does
A card payment starts when a customer presents a card or wallet at a terminal, enters details at checkout, or gives card information for a keyed or recurring transaction. The processor routes the authorization request through the card network to the issuing bank. If approved, the payment is captured, cleared and settled into your business bank account, minus the applicable fees.
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Processing is therefore more than a percentage deducted from each sale. It combines the technology that accepts payment, the connection to card networks and banks, risk controls, settlement, reporting, and often hardware or point-of-sale software. Stripe describes the service as securely accepting, authorizing and settling card and debit payments while connecting merchants with networks, processors and banks.
Start with your payment profile
Write down your current or expected activity before requesting prices. A processor cannot give a meaningful comparison without the variables that drive interchange, risk and fixed-fee impact.
#1 Best Overall
- Use the, easy-to-use, and customizable POS to get started.
- Accept contactless payments, chip cards, Apple Pay, and Google Pay from anywhere, with improved connectivity, extended battery life, and enhanced security. Pay one low rate for every tap or dip.
- No long-term commitments or contracts, no monthly fees- and with offline payments, keep taking payments for up to 24 hours.
- Safely and securely accepts payments anywhere. Plus, get data security, 24/7 fraud prevention, and payment-dispute management at no extra cost.
- Use the, easy-to-use, and customizable POS to get started.
- Monthly card volume: total gross card sales, separated from cash, checks and bank transfers.
- Average ticket: a 15-cent fee is a much larger percentage of a $10 sale than of a $200 sale.
- Channel mix: card-present, ecommerce, keyed or mail/phone order, invoices, subscriptions and mobile payments.
- Card mix: consumer debit, consumer credit, rewards, commercial and premium cards.
- Geography: domestic versus cards issued abroad, currencies collected and countries where your business is registered.
- Operational needs: terminal count, POS features, inventory, invoicing, recurring billing, accounting links, refunds and staff permissions.
- Risk profile: shipping delays, advance bookings, digital goods, regulated products, unusually high tickets or frequent disputes.
Use at least three months of statements if you already accept cards. For a new business, make a conservative forecast and model both a low-volume launch and your expected steady state.
Understand the three layers of processing cost
Every card transaction contains three basic cost layers:
- Interchange: paid to the cardholder’s issuing bank. It varies with card type, channel, merchant category, data quality and other network rules.
- Network assessments: paid to networks such as Visa and Mastercard.
- Processor markup: the provider’s revenue, which may be a percentage, a per-transaction amount, subscription or gateway fee, and additional service charges.
Markup can also appear as terminal or gateway access, monthly maintenance, batch, statement, PCI, retrieval, refund, chargeback, early-termination, non-qualified or downgrade fees. Ask for each item in writing rather than assuming it is included.
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Use this formula for each provider and channel:
Effective rate = (percentage fees + per-transaction fees + monthly, gateway, terminal, compliance and chargeback fees) ÷ gross card volume
Run the calculation separately for card-present, online, keyed, recurring and international payments. Include hardware and software subscriptions in the period in which you will pay them. Keep one model using your actual card mix and a second model with a less favorable mix so you can see how sensitive the quote is.
Why average ticket changes the result
A fixed fee matters most for small purchases. At a $10 sale, 15 cents equals 1.5% before any percentage fee; at a $100 sale, it equals 0.15%. Compare providers using your own ticket distribution, not a single average that hides many small transactions.
Flat-rate, interchange-plus and tiered pricing
| Model | How you are charged | Usually fits | Watch for |
|---|---|---|---|
| Flat rate | One published percentage plus a fixed amount for a defined channel | Early-stage or lower-volume businesses that value predictable setup | Higher cost when your volume or card mix would qualify for lower interchange; separate rates for online, keyed and international payments |
| Interchange-plus | Actual interchange and assessments passed through, plus a stated processor markup | Businesses with sufficient volume and records to analyze transactions | More complex statements, minimums, added platform fees and markups that can be quoted unclearly |
| Tiered | Transactions grouped into qualified, mid-qualified and non-qualified buckets | Rarely the best default for a small business without strong negotiating leverage | Unpredictable downgrades and opaque markups make the effective rate difficult to forecast |
Stripe’s 2026 pricing guidance characterizes flat rate as suitable for businesses processing under US$10,000 per month and interchange-plus as more transparent and potentially more cost-effective above that level. Treat US$10,000 as a rule of thumb, not a guarantee: your ticket size, channel and card mix can move the break-even point substantially.
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Published examples and what they do—and do not—tell you
The following figures are examples published by the providers for US accounts, not personalized quotes. Plans, location, card mix, product and eligibility can change the amount.
Rank #2
- Get your money as soon as the next business day.
- Get set up quickly with no long-term commitments. Download the Square Point of Sale app for free, create an account, and start taking payments anywhere.
- Run your business all in one place with the free Square Point of Sale app. Track your sales, manage inventory, accept tips, send receipts digitally, and more.
- Works with Apple devices with a Lightning connector.
| Provider and use case | Published example | Important qualification |
|---|---|---|
| Square, in-person | 2.6% + 15¢ | Example US rate; product and plan can change pricing |
| Square, online | 2.9% + 30¢ | Example US rate for online acceptance |
| Square, manually keyed | 3.5% + 15¢ | Keyed transactions are priced differently from card-present sales |
| PayPal Advanced Credit and Debit Card Payments | 2.89% plus a fixed fee | US fee table; fixed amount depends on the applicable currency |
| PayPal ACH | 0.80%, capped at $5 | US fee table; verify eligibility and account terms |
| PayPal Virtual Terminal | 3.39% plus a fixed fee | US fee table for phone or other manually entered payments |
| PayPal eligible interchange pass-through | Interchange plus 0.49% plus a fixed fee | Only eligible accounts and transactions; confirm qualification |
Square says cards issued outside the account’s country add 1.5%. It also says custom rates may be available above $250,000 in annual sales. Square states that businesses do not need a long-term contract, but still read the current order, software and equipment terms for renewal and return obligations.
Match the processor to your sales channels
In-person retail, services and mobile selling
An all-in-one POS provider can combine a card reader, checkout software, receipts, catalog, staff accounts and reporting. Square says its merchant services support credit cards, debit cards, NFC wallets and contactless payments online and in stores. This simplicity is valuable when you need to start quickly or do not have a separate POS system.
Confirm whether the reader works with your phone, tablet and operating-system version; whether it connects by Bluetooth, USB or cellular data; and whether the POS can continue in an offline mode. Check the cost of replacement readers, receipt printers, cash drawers and additional locations before committing.
Ecommerce, SaaS and international sales
Stripe says it supports online and in-person payments, more than 125 payment methods, 195 countries and more than 135 currencies. Those capabilities can suit ecommerce, software subscriptions, marketplaces and cross-border businesses. Availability and pricing depend on the country of the legal entity, so verify supported payment methods, settlement currencies, local acquiring, tax or invoicing features, dispute handling and whether funds can be paid to your bank.
For subscriptions, test retries, card-updater support, prorations, cancellations, invoices and customer authentication. A low initial rate is not useful if your billing system cannot handle failed renewals or requires manual work.
Invoices, ACH and phone orders
If customers pay from invoices, compare card and bank-transfer options in the same checkout. PayPal’s US fee table lists ACH at 0.80% capped at $5, which can be materially different from a card transaction for a large invoice. For phone orders, its Virtual Terminal example is 3.39% plus a fixed fee. Keyed transactions carry more fraud risk than a card read in person, so price and control them separately.
Hardware and POS compatibility checklist
A card reader is useful only when its hardware and software match the processor and your workflow. Before purchase, verify:
- Supported iOS, Android, Windows or browser versions and whether updates can end compatibility.
- EMV chip and contactless/NFC support, including mobile wallets your customers use.
- Connection method, battery life, charging accessories and performance with poor connectivity.
- Whether the reader is locked to one processor and transferable if you change providers.
- Receipt, refund, tip, split-tender, tax, offline and partial-approval functions.
- Integration with your POS, ecommerce platform, accounting package, inventory and loyalty system.
- Replacement, warranty, shipping and return terms for leased or purchased equipment.
For a basic in-person setup, an EMV/contactless reader such as the Square Reader for contactless and chip is the type of hardware to evaluate. Confirm the current model’s phone compatibility and listing details before buying; the reader must be supported by the processor you select.
Rank #3
- Pay one transparent rate per swipe for Visa, Mastercard, Discover and American Express.
- Works in conjunction with most downloadable Square point-of-sale apps on your device. Customers can pay, tip and sign directly on your device. Track payments in cash, gift cards and more. Also lets you send receipts via e-mail or text message, makes it easy to apply discounts, keeps a data and sales history log and more.
- Accepts magstripe credit card payments, including those from Visa, Mastercard, Discover and American Express (fees apply).
- App sends deposits to your bank account within 1 to 2 business days, or enjoy instant deposits (fees apply).
Security, PCI DSS and merchant responsibilities
Outsourcing payment processing does not remove your PCI DSS obligations. The PCI Security Standards Council stated in June 2025 that merchants remain responsible for ensuring the provider is PCI DSS compliant for the services offered, maintaining written agreements acknowledging responsibilities under Requirement 12.8.2, monitoring the provider’s compliance at least annually under Requirement 12.8.4, and clearly defining shared responsibilities.
Ask for the provider’s current Attestation of Compliance or responsibility matrix and the Self-Assessment Questionnaire (SAQ) path that applies to your checkout. Confirm whether card data is redirected, tokenized or handled in your environment; how long transaction data is retained; and which systems, employees and vendors remain in scope.
Documents and controls to request
- PCI DSS Attestation of Compliance and a plain-language responsibility matrix.
- The applicable SAQ and instructions for annual validation.
- Tokenization, encryption, access-control and data-retention details.
- Incident-notification timing and your contact during a suspected breach.
- Fraud rules, 3-D Secure or equivalent authentication, velocity limits and manual-review tools.
- Chargeback deadlines, evidence formats and who submits responses.
Do not accept a generic “PCI compliant” statement as proof that no action is required from your business. Keep the agreement, annual monitoring record and completed validation with your compliance documents.
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Payouts, reserves, disputes and account holds
The processor’s cash-flow policy can matter more than a small rate difference. Obtain the normal payout schedule, cutoff time, weekend and holiday treatment, supported bank currencies, reserve triggers and maximum hold periods. Ask what happens after a sudden sales increase, a high refund rate, a card-network alert or a customer dispute.
Read the dispute workflow before launch. Identify the notification channel, response deadline, evidence accepted, chargeback fee, representment process and whether a reserve can be funded from future payments. If you sell services months before delivery, ask how advance payments affect risk reviews.
Contract and exit terms
Review the complete merchant agreement, order form, software terms and equipment schedule. Mark these clauses:
- Initial term, auto-renewal window and notice method.
- Early-termination charges, minimum monthly fees and annual price increases.
- Equipment lease length, buyout amount, return condition and shipping responsibility.
- Ownership and portability of customer tokens, invoices, transaction history and reports.
- Refund, cancellation and data-export procedures after closure.
- Notice requirements for changing bank accounts, legal entities or business names.
A provider that is inexpensive to enter but expensive to leave can cost more than a slightly higher transparent rate. Save exports and reconciliation records before switching, and maintain the old account until refunds and disputes from the prior period are resolved.
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Support and integration due diligence
Support quality is part of the processor’s cost. Test the channels you will use at 10 p.m. on a weekend, not only during a sales call. Ask whether support is staffed by the processor or a reseller, what issues receive priority, and how a payment outage is escalated.
Rank #4
- With Square Terminal, you can ring up sales, accept payments, and print receipts, all with one device. Use it at the counter or ring up customers anywhere in your store.
- Accept all major credit and debit cards and pay one low rate with no hidden fees and no long-term contracts.
- Process chip cards in just two seconds.
- Get your money as soon as the next business day.
- Use it cordlessly with the built-in battery, designed to last all day.
Run a small test of the complete workflow:
- Create a test product, customer and tax rule in the intended POS or checkout.
- Process an approved card-present and online payment, then issue a partial and full refund.
- Verify receipts, order status, inventory, tips, taxes, subscription events and accounting entries.
- Reconcile the gross amount, each fee, refunds, chargebacks and net deposit to the bank statement.
- Test a declined card, duplicate submission, expired card, failed recurring payment and dispute notification.
- Confirm that staff roles prevent unauthorized refunds and that an administrator can export records.
A practical selection process
- Document your baseline: monthly volume, average ticket, channel percentages, keyed and recurring shares, international sales and card-present percentage.
- Request comparable quotes: obtain an itemized quote from at least one flat-rate platform and, when volume makes it relevant, one interchange-plus provider.
- Normalize the math: apply each quote to the same transaction mix and include gateway, terminal, software, compliance, chargeback and annual fees.
- Verify fit: test the required POS, ecommerce, invoicing, recurring billing, accounting and reader workflows.
- Read risk and exit clauses: document payout timing, reserves, holds, dispute deadlines, auto-renewal, termination and data portability.
- Confirm PCI scope in writing: obtain the responsibility matrix and identify your SAQ and annual validation tasks.
- Pilot first: process controlled volume, reconcile deposits and fees, and keep a rollback plan before migrating every customer.
Common mistakes and how to avoid them
Choosing the lowest advertised percentage
A percentage excludes fixed fees and may apply only to one channel. Recalculate with your average ticket and all monthly costs.
Comparing in-person and online rates as if they were interchangeable
Card-present transactions are generally less expensive because online and keyed payments carry greater fraud risk. Use separate rows in your model.
Ignoring international and premium-card mix
Foreign-issued cards, commercial cards and rewards products can have different pricing. Include the 1.5% foreign-card surcharge Square publishes for its applicable accounts when modeling that provider.
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Responsibility is shared. Obtain the provider documents, complete the required SAQ and monitor compliance annually.
Signing before testing the integration
Confirm refunds, recurring billing, accounting exports, offline behavior and staff controls with test transactions. A polished demo does not prove that your actual workflow will reconcile.
Overlooking holds and reserves
Ask how rapid growth, refunds and disputes affect access to funds. Document escalation contacts and maintain cash reserves for a temporary hold.
Decision framework by business situation
| Your situation | Starting direction | What to verify |
|---|---|---|
| Under about $10,000 monthly, mostly local in-person sales | Flat-rate all-in-one POS is often simplest | Average ticket, reader compatibility, software fees, payout schedule and contract terms |
| Above about $10,000 monthly with stable records | Compare flat rate with interchange-plus | True markup, statement transparency, minimums and savings under your card mix |
| Ecommerce or subscription business | Online-first processor with strong APIs and billing tools | Payment methods, currencies, retries, authentication, disputes and data portability |
| Cross-border sales | Provider with required country and currency coverage | Entity eligibility, local settlement, foreign-card costs, conversion fees and reserve policy |
| Frequent invoices or phone orders | Processor with invoicing, ACH and a controlled virtual terminal | Keyed rate, ACH cap, user permissions, recording of authorization and fraud controls |
| High-risk or advance-payment model | Provider that explicitly accepts the business category | Underwriting, reserve triggers, payout holds, dispute evidence and termination rights |
Questions to put in the quote request
- What is the all-in effective rate for my stated monthly volume, average ticket and channel mix?
- Which fees are recurring, one-time, conditional or subject to change?
- Are gateway, batch, statement, PCI, terminal, refund and chargeback fees included?
- What are the rates for keyed, recurring, international, commercial and premium cards?
- When are funds available, and what events trigger a reserve or hold?
- What contract term, auto-renewal and early-termination provisions apply?
- Who owns transaction records and customer payment tokens after cancellation?
- Which hardware, operating systems and POS or ecommerce integrations are supported?
- What PCI documents will you provide, and which SAQ will my business complete?
- How are disputes notified, evidenced and escalated?
Bottom line for choosing
Select the processor whose documented total cost and operating rules fit your actual payment profile. Flat-rate platforms usually win on simplicity for lower-volume businesses; interchange-plus deserves a serious comparison as volume grows or card mix becomes predictable. The final decision should also account for compatible hardware, reliable integrations, payout and hold behavior, fraud and dispute tooling, PCI documentation, support and the cost of leaving.
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