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“Business day” and “due date” for bills
You definitely have an argument for getting them to reverse the late fee, especially if it hasn't happened very often. (If you are late every month they may be less likely to forgive.) As for why this happens, it's not actually about business days, but instead it's based on when they know that you paid. In general, there are 2 ways for a company to mark a bill as paid: Late Fees: Some systems automatically assign late fees at the start of the day after the due date if money has not been received. In your case, if your bill was due on the 24th, the late fee was probably assessed at midnight of the 25th, and the payment arrived after that during the day of the 25th. You may have been able to initiate the payment on the company's website at 11:59pm on the 24th and not have received a late fee (or whatever their cutoff time is). Suggestion: as a rule of thumb, for utility bills whose due date and amount can vary slightly from month to month, you're usually better off setting up your payments on the company website to pull from your bank account, instead of setting up your bank account to push the payment to the company. This will ensure that you always get the bill paid on time and for the correct amount. If you still would rather push the payment from your bank account, then consider setting up the payment to arrive about 5 days early, to account for holidays and weekends.