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What is the difference between a bad/bounced check and insufficient funds?
Insufficient funds will cause a check to bounce. If there is evidence that you "kited" the check deliberately, that's a potential fraud charge. If the vendor accepts that you were just stupid/careless, you'll probably just have to pay a penalty processing fee in addition to making good the payment.  It is your responsibility to track your account balance and not write bad checks. If the timing could be bad, don't write the check yet. If you insist on paying with money you may not have, talk to your bank about setting up overdrafts to draw from another account, or automatic overdraft loans... or use a credit card rather than paying by check.