View your HMRC online account to see if your payment has been received - it should update within 6 working days.
See Also
What Is a Pending Transaction? - ExperianWhat are Pending Transactions on a Credit Card? | ChaseWhat dies it mean when it’s say we have received your refund and it’s being processedHow to avoid unnecessary delays in claiming Self-Assessment repaymentsYou can also check your bank or building society statement to confirm the payment has left your account.
If you’re paying by post, you can include a letter with your payment to request a receipt from HMRC.
