This article explains how to manually add a credit card merchant fee to an invoice in Workshop Software. If you are using WorkshopPay, merchant fees can be charged automatically — please see the WorkshopPay guides for details.
Currently, the system cannot automatically add a percentage fee to the invoice. The workaround involves creating a product for the merchant fee and adding it to the invoice before processing.
Step 1: Create a Merchant Fee Product
- Create a product for the merchant fee.
- Ensure the Don’t Upd. Qty toggle is set to Yes.
- Ensure the GST Free toggle is set to Yes.

Step 2: Add the Merchant Fee to the Invoice
- When you are about to process the invoice, calculate how much merchant fee you want to charge.
- Add the Merchant Fee product to the invoice.

- Update the Unit Price to reflect the fee amount to be collected.

Step 3: Process the Invoice
- Now you can process the invoice as normal. The merchant fee will be included in the invoice total.
Good to Know
- If you are using WorkshopPay, merchant fees can be applied automatically — you do not need to use this manual method.
- Set the merchant fee product as GST Free and Don’t Update Quantity to avoid affecting your stock levels and tax calculations.
- You will need to manually calculate the fee amount each time, as the system does not currently support automatic percentage-based fees.