Running a business through a bank account creates small, recurring fees, and the ones tied to your business are deductible. That includes monthly account maintenance fees, wire and ACH transfer fees, overdraft and insufficient-funds charges, check-printing costs, and the annual fee on a business credit card.
Payment processing fees are often a bigger number and are fully deductible. When Stripe, PayPal, Square, or a card processor keeps a percentage of each sale, that fee is a business expense. Over a year of transactions it adds up, so it is worth capturing.
The cleanest way to claim these is to run your business through a separate business bank account and card. That makes every fee clearly a business cost and keeps your records clean, which also helps at tax time and if you are ever asked to substantiate anything.
Note that interest on a business loan or business credit card is deductible too, but it goes in a different place (interest), not with the fees. Keep your monthly statements so the fees are easy to total.

