In the "Business Subsidy" page, you will see three options:
No Subsidy (cardholder pays entire fee): The default setting, this means the cardholder pays the entire fee and you as the business pay nothing.
Subsidize Entire Fee (cardholder does not pay a fee): If you would like to subsidize the entire fee for the cardholder so that they pay no fee and you pay the full 2.5% fee.
Subsidize ____ % of Cardholder Fee: If you would like to subsidize part of the fee, such that you pay for some of the fee and your cardholder pays for the remainder, you can designate a custom percentage that you would like to subsidize. Please note that the percentage you enter is the actual percentage (out of the 2.5% default rate), not the percentage of the fee. For example, if you'd like to pay for half of the 2.5% fee, you would type in "1.25%" and not 50%.
Note: When implementing a subsidy, it is important to know how they will appear for both you and the cardholder. Typically, Plastiq transactions show up as two line items on the cardholder statement- the principal amount paid to the business (e.g. $100) and the fee amount paid to Plastiq (e.g. $2.50). If you subsidize all 2.5% of the fee, Plastiq transactions will still show up as two line items on the cardholder statement- the principal amount paid to the business minus the fee (e.g. $97.50) and the fee amount paid to Plastiq (e.g. $2.50). The $97.50 is deposited to you, and the $2.50 is sent to Plastiq. Note that the two line items equals the full amount the customer owes the business ($100) but only $97.50 is sent.
It is important to be aware of this and also to notify your customers, so there are no surprises when they see the items on their card statements.