If you won’t have the funds available at the time the check is written, you might consider postdating the check.
In most cases, they can deposit the check made a free-and-clear payment.
If your payment is rejected, you might be unable to buy a product or service that you wanted, you might have to pay late-payment fees, or there might be other consequences. The IRS generally doesn’t accept postdated checks, and some universities won’t either.
Whether you received a postdated check or you’re thinking of writing one, it’s important to know how they work (and that they often illegal to write a check when you know you don’t have the funds to cover it, but things get a little fuzzy – and might depend on state law – when you postdate a check (assuming it is accepted as payment).
Of course, it’s also illegal to defraud somebody who sells you something (by Just because it's legal doesn't mean things will work out the way you intended: using a postdated check does not create a legally binding agreement between you and the person you wrote the check to.
There are one or two exceptions (like if you’re a debt collector), but most individuals are free to take postdated checks to the bank.