If you can't delete a sales invoice, you need to reverse it instead.

Reversing creates an opposing transaction that cancels the original invoice. This:

• Removes the customer's outstanding balance
• Reverses the values posted to your ledger accounts
• Cancels out the related VAT liability

You can't delete a sales invoice if:

• The invoice came from another accounting system when you migrated your data
• The invoice has an allocated payment
• It's included on a VAT Return
• The invoice is both paid and included on a VAT Return

If you included the invoice on a submitted VAT Return, reverse it after removing any allocated payments. 

If your invoice has a payment allocated, read unallocate a customer receipt from an invoice before following the steps in this guide.

1. Go to Sales and then Sales Invoices.
2. Search for and open the relevant invoice.
3. Select Add credit note.
4. The credit note automatically uses the invoice details.
5. Change the Credit Date* to match the invoice your reversing.
   
   NOTE:

   Sage sets this to today's date by default.

6. Select Save.

Your next VAT Return includes the credit note and cancels any previous VAT liability.