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How Payment Fees Affect Your Profit Margins

August 24, 20265 min read

You know your processor charges roughly 3%. But that 3% doesn't come out of your revenue — it comes out of your profit. And that changes everything.

The profit margin trap

Say you sell a product for $50. Your cost of goods is $30. Your profit before payment fees is $20 — a 40% margin.

Now subtract the payment fee: 2.9% of $50 = $1.45, plus $0.30 fixed = $1.75 total.

Your new profit: $18.25. Your margin drops from 40% to 36.5%. That single fee shaved 3.5 percentage points off your margin.

It gets worse on smaller margins

If your margin is already thin — say 15% on a $30 product ($4.50 profit) — a $1.17 payment fee eats 26% of your profit. The fee percentage stays the same, but the impact on your bottom line is devastating.

How to adjust

You have three options:

  1. Absorb the fee — build it into your pricing. If you need a 40% margin and your fee is ~3.2%, price at roughly 1.05× what you'd charge with zero fees.
  2. Pass it through — some B2B sellers add a "processing surcharge" (legal in most US states since 2013). This is transparent but can frustrate customers.
  3. Choose a cheaper processor — the difference between 3.49% (PayPal standard) and 2.7% (Stripe Terminal in-person) is $0.75 per $100. On $100K annual volume, that's $750 saved.

The volume math

On $10,000 in monthly sales at 2.9% + $0.30:

  • If your average transaction is $100: fees = $320/month ($3,840/year)
  • If your average transaction is $25: fees = $380/month ($4,560/year)

That's the fixed fee at work again — more small transactions means more fixed fees, which means a higher effective rate.

Calculate your actual fees

Don't estimate. Use our calculators with your real transaction amounts:

For each one, enter your typical transaction amount and see exactly what you'd keep. Then multiply by your monthly volume to see the real annual cost.

The bottom line

Payment fees are a cost of doing business — but they don't have to be a mystery. Know your numbers, compare your options, and price accordingly.