Create one factual case summary
Record the business that issued the invoice, the customer, the invoice reference, the original amount, the due date shown in your records and the balance you currently believe remains outstanding.
Mark anything that is uncertain. A visible gap is safer than filling a record with an assumption.
- Correct business and customer names
- Invoice reference, issue date and recorded due date
- Original amount, credits, payments and current balance
- A short description of what was supplied
Keep the source documents together
Collect the agreement or accepted quote, invoice, delivery or completion records, credit notes and payment records. Keep the original files where possible and note where each item came from.
Do not treat a neat file name or a PDF export as proof that the source is complete or authentic. Record missing documents so they can be checked.
Build the timeline as events happen
Add each reminder, reply, call note, payment promise, dispute and payment in date order. Record what happened and who recorded it without rewriting earlier entries to make the history look cleaner.
If an earlier note is wrong, add a clear correction that preserves the original record and explains the change.
Choose the next administrative step
Decide whether the record needs a professional reminder, a promise follow-up, a dispute review, a balance check or independent advice. The right next step depends on the facts already recorded, not the age of the invoice alone.
Pause before escalation if the customer identity, amount, performance record or dispute position is unclear.