An account owner should update his checkbook register after each new transaction. Doing so helps the account owner keep track of his balance and avoid overdraft fees.
To update a checkbook register, the account owner records the transaction type in the appropriate column, and then enters the check number or an abbreviation for the transaction along with the transaction date. A brief description in the transaction type column serves as a reminder of the transaction. Subtracting the amount of the transaction from the balance keeps the balance up to date.
Account owners should also enter transaction information for deposits. After noting the deposit in the appropriate column, the owner then adds the amount of the deposit to the existing balance to get the new balance amount.