How they work: Free transfers are single use, and are always automatically used on the next standard payment you make with us. You'll normally be notified in your invitation e-mail how much the discount will be.
Free transfers are only applied to transfers where you're sending money, whether it's a normal payment or payment to a specific amount.
What does the discount apply to?
The free transfer is applied to the normal TransferWise fees that you see when you first start creating a transfer (usually 0.5%, 0.7%, 1% etc. of the amount you're sending). This means that any additional fees, such as credit card fees or any additional banking fees, are not covered by the discount.