What type of checking account usually requires the highest balance to be kept on deposit?

It differs from bank to bank. Each bank has different types of checking accounts that require different balances because they get diffrent benefits. For example, Wells Fargo has a checking account called the PMA checking, which stands for Portfolio Management. To keep it free you need to have $25000 or more in combined balances, including 10% of your mortgage. Combined balances means the total of all your accounts with Wells Fargo. This account gets bonus interest rates on savings accounts, gets all check designs free, entitiles the owner to 100 free stock trades per year in a wellstrade account, makes any other account the owner has free without a minimum balance, waives the fee on a line of credit, and gets other perks. Usually MoneyMarket checking accounts require high minimum balances because they earn the highest rate of interest.