Client invoice Discount & Extra charge

To enter a discount and/or an extra charge for the invoice, press "Actions" and then "Discounts & extra charges":

You may add them whether as a percentage or flat amount.

To do that, select the extra charge or discount type you need (Percentage or Absolute) and enter the required value:

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Press "Save" after entering, and you'll go back to the Client invoice page.

Note: Invoices with zero or negative amounts cannot be linked to payments.