If you write paper checks, it's harder to keep up. If you bank online, you're on top of things every time you log in. All the information you need about outstanding checks and account history is right in front of you. Your bank may even help you balance your checking account by reducing your 'available' balance for bills you've paid online - even if the recipient hasn't deposited the check.
If you find yourself paying overdraft fees, consider doing more online (you should also watch your budget and get an overdraft line of credit).
Speaking of saving money, you have to pay for those checks when you order them, and you have to pay for postage when you mail your bills in. Keep that money in the bank.
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