Payments

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

  1. Retry at sensible intervals rather than immediately and repeatedly.
  2. Notify the customer on the first failure with a secure link to update payment details.
  3. Follow up before access changes.
  4. 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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