Massachusetts: Credit Card Processing Fee Allowed?

[Matt Davis]

Legal question:

Massachusetts has lots of rules landlords must follow. One of these is that we are generally not allowed to charge fees. My understanding is that Pet fees, move in fees, application fees, etc. are all illegal. But how about credit card fees?

My property management software Buildium supports credit card payments (if enabled) and the x% fee associated with this can be configured to be charged to LL or Tenant. I keep the feature disabled. Would it be illegal to enable this feature and have it configured to charge the fee to the tenant?