How Payment Processing Fees Work: Stripe vs. PayPal & Gross-Up Math

When a customer checks out on your digital storefront or settles an invoice online, three distinct entities claim a portion of the transaction value: • Card Issuing Bank: Collects the interchange fee (typically 1.5% - 2.5% based on card type, rewards tier, and consumer vs. corporate classification). • Card Networks (Visa, Mastercard, Amex, Discover): Collect card network assessment and brand network fees (typically 0.13% - 0.15%). • Payment Gateway / Aggregator (Stripe, PayPal, Adyen, Square): Packages the technology, compliance, fraud prevention, and merchant account into a simplified, blended rate structure.

Here is how standard domestic transaction rates compare across major tier-1 payment gateways for typical transaction sizes:

A frequent challenge for agencies, contractors, and merchants is: "How much must I charge so that after payment fees are deducted, I receive my exact target net amount?" If you simply add 2.9% to a $1,000 invoice ($1,029.00), the processor deducts 2.9% from the new $1,029.00 total ($29.84) plus $0.30 = $30.14, leaving you with only $998.86. Instead, you must use the mathematical gross-up formula:

Suppose you wish to receive an exact net sum of $1,000.00 via standard Stripe (2.9% + $0.30): Step 1: Identify variables: Target = $1,000.00, Fixed Fee = $0.30, Rate = 0.029 Step 2: Add numerator: $1,000.00 + $0.30 = $1,000.30 Step 3: Calculate denominator: 1 - 0.029 = 0.971 Step 4: Divide: $1,000.30 / 0.971 = $1,030.18 Verification Check: Stripe fee on $1,030.18 = ($1,030.18 × 0.029) + $0.30 = $29.88 + $0.30 = $30.18. Net Payout to Merchant = $1,030.18 - $30.18 = $1,000.00 exactly.