A bill that has already reached the customer should not be quietly edited. The correction belongs on a document of its own.
Editing an issued invoice is the tempting shortcut and the one that causes trouble: the customer holds the old version, your return may already have been filed on it, and nobody can reconstruct what changed.
A credit or debit note keeps the original intact and records the adjustment separately — a rate agreed down after delivery, a shortfall found on unpacking, a discount granted later. Both sides can hold the same two documents and arrive at the same figure.
The invoice being adjusted.
A credit note in the customer’s favour, or a debit note.
What is being adjusted, and why.
The party’s position moves by the note.
The paperwork either side of the bill: quotations and orders before it, returns and notes after it, on both the selling and the buying side. Each document carries over to the next, so an accepted quote becomes an order or an invoice without being typed again.
Trades that quote before they deliver live in this area — the quote goes out, the order confirms it, the challan moves the goods, and the invoice closes it.
The other corrections and the lock that makes notes necessary.
Whenever the bill has already reached the customer, and always once the period has been filed or locked.
Yes, by the amount of the note, in whichever direction it goes.
A return moves goods. A note adjusts value — a rate, a shortfall, a discount — without goods necessarily moving.
The original bill and the adjustment, both on record, both sides agreeing.
