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Delayed interest can be applied to an invoice, and is later payable if your client has broken the rules of payment that are agreed upon.

Default sales invoice interest is set to be 0.1%, it can be turned off and custom interest (the value must be between 0 and 0.1) can be inserted under Income-> Invoice settings page.

If you don't wish to add interest to your invoice, then you can simply set it to 0%.