The order in which banks process checks and other debits determines the overdraft fees they charge. So if you write a batch of small checks without the deposit clearing you may face overdraft charges. My bank charges $35.00 per overdraft. Also your bank may they take the largest amount of your checks first which eats up the bulk of your balance. Then, they can charge you a fee for each small check that overdraws your account.
Those fees make up 90% of service charges on deposit accounts, and they’re expected to yield a record $53.1 billion for financial institutions this year, according to the research firm Moebs Services.
It pays to be on the safe side and allow enough days for your deposit to clear. Bank overcharges can ruin what might have been a bright day.