A credit note, also known as a credit memorandum or a credit memo, is an official legal document, just like an invoice or a purchase order, that suppliers provide to customers to notify the customer that credit is being applied to their account for any number of reasons. It’s a way to issue full or partial refunds for invoices that have already been issued or paid. You may issue a credit note to your customers because:
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1) The customer returned goods or rejected services for any number of reasons.
2) There was an overpayment on the original invoice.
3) There was a mistake in price on the original invoice.
4) The goods were damaged in some way during transit.
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​How to issue credit note?
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Let's see how to record a credit note in ProfitBooks:
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1. Go to Income-> Invoice. Select the Invoice which you want to mark as return.
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Under Action button of that Invoice click on Return.
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As soon as user will click on return this invoice, the Invoice returns page will come up. Fill in the quantity details you want to return and warehouse details accordingly.
Click on save.
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2. Go to Income> Invoice Return.​ Select the Invoice Return for which you want to issue credit note.

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Under Action button of that Invoice Return, click on create GST Credit Note.

Credit note for the invoice will be created. User can check that from Income> Credit note.