Dorsey says the flat monthly fee is continuation of Squares emphasis of making credit card fees understandable. Square also lets you create a basic Square Online Store. Square Introduces A Flat Monthly Fee For Small Business Credit Card Processing The square footage of a room measuring 20 feet wide by 20 feet long is 400 square feet. Square flat fee . Until now Square has offered businesses with monthly debit- and credit-card transactions of roughly 21000 or less the option to pay a monthly fee of 275. Above that rate its a flat rate of 1 per transaction plus the old 275 percent fee. We design pricing packages for larger businesses depending on payment volume average transaction size your history as a Square seller and more. Instead square charges a flat fee that you pay back through the span of the loan. When you manually key in your customers card details or use a card on file the fee is 35 15. Square doesnt have monthly or hidden fees and it has the same processing fee