Write down the intended account
Begin with the payment’s tax period, authority, method, date, and confirmation reference. Keep the instructions you used if they explain the intended destination. A bank transaction may show that funds moved without showing how the tax account recorded them, so preserve both kinds of evidence when available.
Mark the unexplained difference
Compare the confirmation with the notice or account entry that prompted your question. Look at the period and description rather than only the amount. If they do not seem to align, write the discrepancy as something to investigate. Avoid treating a matching bank amount as automatic proof that every allocation or account detail is settled.
Keep follow-up connected to the evidence
Use the relevant official account or notice process to ask about the recorded payment, with the confirmation ready. Save the date, requested evidence, and next action in your own file. If professional help is involved, agree how the question will be reviewed and documented. Retain current payment responsibilities separately while the earlier transaction is clarified, without assuming the inquiry itself changes an account obligation.
Preserve the version and date of each source, and leave an unresolved difference as a question for review.