What is a debit note?
A debit note is the mirror of a credit note — a document increasing what a customer owes, issued for under-billing or additional charges discovered after invoicing. It references the original invoice and keeps the correction traceable instead of silently reissuing the bill.
In practice
A consultant realizes 4 hours were left off invoice INV-91. She issues debit note DN-03 for $600 (4 x $150) referencing INV-91, rather than pretending the original never happened.
Bill the missed hours correctly
Traceable corrections on numbered documents — no silent edits, no confusion.
Create an invoice — freeFrequently asked questions
When would I send a debit note?
Under-billed hours, missed line items, or costs discovered after invoicing. It's the honest way to add charges to an already-sent invoice.
Will clients accept a debit note?
If the charge is legitimate and documented, usually yes — especially with timesheets or receipts attached. Surprises are the problem, not the document.
Debit note vs. just sending another invoice?
A second invoice works for genuinely new work. A debit note is for correcting the first invoice — it links the two so the history stays clear.