Guide · Updated May 2026
Markdown exportPrepayments and previously paid amounts
Prepayments need to be shown separately so the final payable amount can be calculated correctly.
What you may see
Use these points as the practical checks for this section.
- Prepaid amount must be non-negative
- Prepaid amount exceeds invoice total
- Prepayment reference is missing
- Previously paid amount affects the amount due
What this means
Some invoices include an amount that has already been paid, such as a deposit, advance payment, or partial payment. The e-invoice must show that amount separately so the final amount due can be calculated correctly.
What to check
Use these points as the practical checks for this section.
- The invoice total including VAT
- The amount already paid
- The amount still due
- Any previous invoice, deposit, order, or payment reference
- Whether the source invoice is a credit note instead of a normal invoice