Can I Charge Investors an Additional Fee on Top of Their Investment?

Yes, this is an Investor Transaction (or Processing/Ancillary) Fee, and it's entirely your choice whether to charge one, and how. It can be a flat dollar amount or a percentage of the investment, with an optional cap on the percentage version so no investor pays more than a set maximum regardless of their investment size.

This fee is paid to you, not DealMaker, but it counts toward your total raise amount and toward each investor's individual investment limit, since it's calculated as part of the total cash processed on that transaction.