Checkout fee inputs
Start with revenue, monthly orders, average order value, international card share, refund rate, and chargeback rate. Those inputs explain most provider differences.
Checkout economics
SaaS Checkout Fee Calculator
Estimate the fee impact of a SaaS checkout before choosing a payment provider, merchant of record, checkout flow, or subscription setup.
Provider model matters
A direct processor and merchant of record may both power checkout, but they do not bundle the same work. Compare the operational responsibilities too.
Low-ticket checkout
Cheap monthly plans are sensitive to fixed fees. Model monthly and annual billing before deciding your checkout strategy.
Global checkout
International cards, tax coverage, local payment methods, refunds, and disputes can change the best checkout provider.
Checkout fee checklist
| Input | Why it matters | Where to model it |
|---|---|---|
| Average order value | Fixed per-transaction fees hit low-ticket plans harder than annual or higher-ticket plans. | Annual vs monthly billing |
| International share | Cross-border and international card fees can make the blended rate higher than the domestic headline rate. | International card fees |
| Tax workflow | Checkout fees do not tell you who owns tax calculation, registration, filing, remittance, and invoice questions. | SaaS tax model |
| Provider model | Direct processors and merchant-of-record providers bundle different responsibilities. | Processor vs MoR |
Checkout fees are not just payment fees
A checkout decision also affects failed-payment recovery, customer portal behavior, invoice wording, local payment methods, tax collection, receipts, and migration effort. Those details can matter before raw rates differ by much.
Use scenarios before choosing
Run at least three cases: current revenue, a lower average order value, and a more international customer mix. If the best provider changes between cases, the decision is sensitive enough to review before implementation.
Do the migration check early
Checkout migration cost is easy to underestimate. Before choosing a provider, list what must move: customer records, active subscriptions, tax settings, invoice history, webhooks, email receipts, customer portal links, and refund workflows. A small fee advantage can disappear if the migration creates support debt.
If any item is unclear, delay migration until the export and rollback path is documented. This protects subscription revenue during changes. It also makes vendor lock-in visible before the checkout stack becomes permanent.
Match checkout to the sales motion
A self-serve SaaS, a developer API, a template store, and a high-touch B2B product may need different checkout flows. The best provider is not always the one with the lowest modeled fee; it is the one that supports how buyers discover, purchase, renew, and ask billing questions.
Run a checkout scenario
Use the calculator to compare Stripe, Paddle, Lemon Squeezy, and Polar from one input set.
Open the calculatorRelated pages
SaaS checkout fee FAQ
What is the biggest checkout fee mistake?
Comparing headline rates only. Average order value, fixed fees, international cards, refunds, and tax workflow can change the real result.
Should checkout fees include sales tax or VAT?
For provider comparison, keep collected tax separate when possible and model tax operations as a workflow cost.
When should I use merchant-of-record checkout?
Use it when global tax, support, invoicing, and compliance operations are more expensive than the additional bundled provider fee.