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An error occurred while saving the comment An error occurred while saving the comment Anonymous commentedThe calculation is not quite as simple as a percentage of the subtotal. There are two items to consider:
1. The processing fees are often a flat charge + percentage of the payment (ex. $0.30 + 2.75%).
2. The "adjustment" amount goes into the total charge and is then also charged the percentage component of the transaction fee.The calculation would be: Adjustment = (Subtotal + $FixedFee) / (1 - %Fee) - Subtotal
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Couple of additional notes:
1. Would want the adjustment to be applied only when payment is made through a processor with a fee (ie. not for cash or check payments).
2. They fees can vary by processor and within processor by payment type, so the formula could not be hard coded into the invoice until the payment details were entered.