The Hidden Anatomy of a Payment Processing Fee
Every fee you pay has three layers baked into it. Understanding them is the key to knowing whether you're getting a fair deal.
What Makes Up a 2.9% + $0.30 Fee
Paid to the bank that issued your client's card.
Paid to the card network (Visa, Mastercard).
Kept by Stripe, Square, or PayPal as their profit.
When Stripe tells you that their rate is "2.9% + $0.30," that single number hides a three-way split between your client's bank, the card network (like Visa), and Stripe itself. Understanding these layers tells you exactly why fees exist — and who is actually profiting.
Layer 1: The Interchange Fee
Paid to: Your client's issuing bank
The interchange fee is the largest component of any processing fee. It compensates the bank that issued your client's credit card for the risk of extending credit. This is why premium rewards cards and business cards cost more to process — the banks use the interchange to fund those perks.
Layer 2: The Assessment Fee
Paid to: Visa or Mastercard
The card network (Visa, Mastercard, Amex, Discover) charges a small fee for maintaining the global infrastructure that allows payments to happen anywhere in the world. This is generally a fixed, non-negotiable rate — no matter who your processor is, Visa's cut stays the same.
Layer 3: The Processor Markup
Kept by: Stripe, Square, PayPal
This is the only component that is negotiable. Your processor's profit margin sits on top of the interchange and assessment fees. For high-volume businesses, this is the number you can negotiate down. Stripe and PayPal both offer custom pricing for businesses processing over $100,000/month.
Why International Cards Cost More
When a client pays with an international credit card, the interchange fee increases significantly. The card's issuing bank is in another country, the currency must be converted, and the risk profile of the transaction is higher. This is why processors typically charge an additional 1%–1.5% surcharge for cross-border transactions.
Now that you understand the anatomy of fees, use the calculator to compare how different processor rates affect your specific invoice amounts.
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