Hey there, @East10Laundry -
Thank you for posting in the Community and Welcome!
I can give you some insight on how other sellers I've spoken with handled a similar situation. Essentially, you have two options. To preface this - you should speak with a tax professional on permitted surcharges, so you are on the right track.
Option 1 is to create a tax that you can add to the invoice whenever it is created. This would allow the tax to be automatically calculated by percentage or if you have a set amount.
Option 2 is to create an item as a surcharge to add to those invoices. Similar to the tax option - you can set a certain amount to charge when you add it to the invoice.
Take a look at both of these and please let me know if you have any other questions.
Kassi
Community Moderator, Square
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