Am I required to use the monthly or annual average cost of acceptance in our surcharge calculation? 

You should use the annual average cost of acceptance in your calculation. However, if only the monthly average cost of acceptance is available, you can use this figure and adjust your surcharge amount when the annual average cost of acceptance is available at the end of the financial year.

If neither is available, and we can’t calculate the average cost of acceptance for you based on data you provide, we suggest that any surcharge amount you choose to apply be limited to only your MSF fee until we have enough transaction data available.