Subscription Billing for SaaS: Plans, Trials, Upgrades, and Failed Payments
What a complete SaaS billing system needs to handle, and the edge cases that catch most first-time builders out.
Billing looks simple until you build it. Charging a card each month is easy; handling trials, upgrades, cancellations, taxes, and failed payments correctly is where the real work lies.
Use a billing provider
Established payment providers handle card processing, recurring charges, invoices, and much of the compliance burden. Building billing from scratch is rarely worthwhile.
The scenarios your system must handle
- Free trials, with or without a card upfront
- Upgrades and downgrades, including how mid-cycle changes are charged
- Monthly and annual billing
- Cancellations and what happens to data afterwards
- Coupons and discounts
- Taxes appropriate to your customers' locations
- Refunds
Failed payments
Cards expire and payments fail. A good system retries automatically, notifies customers with clear instructions, and gives them time to fix the problem before restricting access. Handled well, many failed payments are recovered without any human involvement.
Keep billing and product in sync
Your product needs to know what each customer is entitled to. Store plans and limits in one place, update them from billing events reliably, and make sure the application checks entitlements rather than hard-coding plan names.
Give customers self-service
- View and download invoices
- Update payment details
- Change plans
- Cancel without contacting support
Every billing question a customer can answer themselves is one less support ticket and one less reason to churn.
Test the edge cases
Test with simulated failed payments, plan changes on the last day of a cycle, and cancellations during trials. These are exactly the scenarios that cause problems after launch.
MOKRIN builds subscription billing on proven providers, with entitlements, self-service, and failed-payment recovery handled properly from the start.
