How to choose subscription billing software
28 Aug 2026 · 2 min read · By the Knock team
Key takeaways
- Start from your billing model and compliance needs, not a feature list.
- Test with real scenarios: upgrades, credits, tax and failed payments.
- Check data export and how easily you can leave.
Switching billing systems is painful, so it pays to choose with care. Use your own requirements as the yardstick.
1. Fit with your pricing model
Can it handle per-seat, tiered or usage-based plans, trials, add-ons and annual contracts? Ask to see your actual pricing configured.
2. Tax and compliance
For India, look for GSTIN capture, place of supply logic, CGST/SGST/IGST splits, SAC codes and sequential numbering. Check how it handles credit notes.
3. The full workflow
- Quotes and approvals.
- Recurring invoice generation.
- Payment collection and reminders.
- Customer self-service portal.
- Reporting.
4. Team controls
Roles and permissions matter once more than one person touches billing. Look for an activity log.
5. Data and exit
- Bulk import of customers and subscriptions.
- Full export in open formats.
- API access if you plan integrations.
6. Run a pilot
- List ten real scenarios, including awkward ones.
- Configure them in each candidate.
- Compare invoices to what you expect.
- Involve finance and support.
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