Use a linked debit note for additional charges that belong to an invoice already issued.

1. Choose the original invoice

In Invoicing → Invoices, find the original sale and use its Create Debit Note action. Check that it is the invoice the new charges belong to.

2. Explain the charge

Enter a reason for the additional charge and choose Create Debit Note.

The dialog identifies the original invoice and asks why the additional charge is needed.
The dialog identifies the original invoice and asks why the additional charge is needed.

3. Enter only the additional value

The debit-note draft starts without amounts. Add the new lines or additional tax value. The original customer and currency remain linked.

The draft identifies the original invoice and opens separately for editing.
The draft identifies the original invoice and opens separately for editing.

4. Save and preview

Check the new debit-note number, dates, lines, tax, and total. Save and preview before sending. The original invoice and its payments remain separate.