Failed payments: why they happen and how to recover them
18 Sept 2026 · 2 min read · By the Knock team
Key takeaways
- Most failures are soft declines that can succeed on retry.
- Reminders for expiring cards prevent failures.
- Track recovery rate as a core metric.
A failed payment is not a cancellation, but it becomes one if nobody acts. Understanding why payments fail tells you what to automate.
Common causes
- Insufficient funds at the time of the attempt.
- Expired or replaced cards.
- Bank blocks on unfamiliar or recurring charges.
- Mandate or authentication requirements not completed.
- Customer closed the account or no longer wants the service.
Soft vs hard declines
Soft declines, such as temporary insufficient funds, may succeed on a later retry. Hard declines, such as a closed account, will not. Retry the first kind and ask the customer for new details for the second.
A recovery process
- Retry at sensible intervals rather than immediately and repeatedly.
- Notify the customer on the first failure with a secure link to update payment details.
- Follow up before access changes.
- Escalate high-value accounts to a person.
Prevent failures
- Email customers before a card expires.
- Offer alternative payment methods.
- Send an upcoming invoice notice for large annual charges.
- Let customers update details in a self-service portal.
Measure
Track the share of failed payments recovered and the average days to recover. Improvement here is a direct lift to revenue.
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