Estimate how much payment fees, fixed checkout fees, international cards, refunds, and chargebacks can change SaaS take-home revenue.
SaaS founders often compare providers too late, after checkout, tax, invoices, and customer records are already wired together. A payment fee calculator is most useful before the billing stack becomes expensive to change.
Stripe, Paddle, Lemon Squeezy, and Polar do not package the same work. Some providers focus on payment processing, while merchant-of-record providers bundle more tax, compliance, and buyer support into the fee.
Start with monthly revenue, monthly orders, and international card share. Those three inputs usually explain more of the fee difference than the headline percentage rate alone.
Model your current monthly plan, your annual plan, and a higher-growth scenario. A provider that looks expensive at $500 MRR may become reasonable once the time saved on tax and operations matters more.
| Question | Why it matters | Best next page |
|---|---|---|
| Are orders low-ticket? | Fixed fees can dominate small monthly payments. | Low-ticket SaaS fees |
| Are buyers global? | International card and tax operations can change provider economics. | Global SaaS payment fees |
| Do you need tax operations bundled? | Merchant-of-record pricing may save operational work. | Merchant of record pricing |
| Do you need checkout control? | Direct processors can offer more flexibility and integration control. | Processor vs MoR |
Effective fee rate is total provider cost divided by product revenue. It is more useful than comparing headline rates because it captures fixed fees, order size, refunds, chargebacks, and international-card assumptions in one number.
Before choosing a billing stack, run a conservative version with lower average order value, higher international share, and a modest refund rate. If the provider still works in that scenario, the decision is less fragile.
Change one assumption at a time: order count, annual billing, international card share, refund rate, or chargeback rate. The assumption that changes the winner is the assumption to verify before you build checkout.
Keep a short note of the rates, order profile, tax plan, and provider pages used in the decision. That makes it easier to recalculate later when pricing changes, customers go global, or a merchant-of-record option becomes attractive.
The main calculator compares SaaS payment providers from one input set.
Open the calculatorComparing only the percentage fee. Fixed fees, international cards, refunds, chargebacks, and tax operations can all change the real take-home amount.
Sometimes. It can be useful when selling globally or when a small team wants tax and payment operations bundled. It may be overkill if you sell locally and already have finance operations.
Recalculate when pricing changes, order volume changes, international sales grow, or refund and dispute rates shift.
Effective fee rate is total payment and provider cost divided by product revenue. It helps compare providers when fixed fees and order values differ.
Yes. Payment fees, tax calculation, tax filing, and merchant-of-record responsibilities are separate economic layers. Model each layer before picking a stack.