Flat Rate Pricing

A payment processing pricing model where merchants pay the same percentage rate and fixed fee for all transactions regardless of card type, transaction method, or interchange category, popularized by payment facilitators like Square, Stripe, and PayPal.

Flat rate pricing simplifies payment processing by charging a single, predictable rate for all transactions, typically ranging from 2.6% to 2.9% plus $0.10 to $0.30 per transaction depending on the provider and transaction channel. For example, Square charges 2.6% + $0.10 for in-person transactions and 2.9% + $0.25 for online payments. This model eliminates the complexity of understanding interchange categories, card types, and various fee components, making it attractive to small businesses, startups, and merchants who value pricing simplicity over optimization.

The primary advantage of flat rate pricing is transparency and predictability—merchants know exactly what each transaction will cost without needing to understand the nuances of interchange rates, assessment fees, or processor markups. Flat rate processors also typically offer rapid onboarding, no monthly fees, no long-term contracts, and integrated hardware or software solutions. This makes flat rate pricing ideal for businesses just starting out, seasonal or occasional sellers, merchants with low monthly volume (under $5,000-$10,000), and businesses that accept many premium rewards cards that carry high interchange costs.

However, flat rate pricing often costs more than interchange-plus pricing for established businesses because the single rate must be high enough to cover the processor's costs on expensive cards (premium rewards, business cards) while generating profit on lower-cost cards (basic credit, regulated debit). A merchant processing significant volume on low-interchange cards (such as debit cards) effectively subsidizes high-interchange cards under flat rate pricing. Merchants processing $10,000+ monthly may save substantially by switching to interchange-plus pricing that charges actual card costs plus a smaller markup. The break-even point depends on the business's specific card mix, average ticket size, and processing volume.

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Related Terms

3D Secure

An authentication protocol for online card transactions that adds an additional verification layer between the cardholder and issuing bank, shifting fraud liability from merchants to card issuers when properly implemented.

ACH Payment

Automated Clearing House payment is an electronic bank-to-bank payment method that transfers funds directly between bank accounts through the ACH network, typically used for direct deposits, bill payments, and recurring transactions.

Acquirer

A financial institution that processes credit card payments on behalf of merchants, maintains merchant accounts, and facilitates the settlement of funds from card-issuing banks to merchant bank accounts.

Address Verification Service (AVS)

A fraud prevention tool that compares the numeric portions of a billing address provided during a transaction against the address registered with the card-issuing bank, returning match result codes to help merchants assess transaction risk.

Aggregator

A payment service provider that enables multiple merchants to process card transactions under a single master merchant account rather than each merchant having their own dedicated merchant account, common with services like Square, Stripe, and PayPal.