text: how long does it take the irs to cash a check for taxes owed?   both you and me are trying to find the answer to that one.  all i can tell you is that irs.gov is no help either.  they have plenty of information about refunds, but only info about how to inquire about payment if it has taken an inordinate amount of time to process.  from the site:  i'm concerned because my check payment to the irs has not been cashed yet. what should i do?  you can call (800) 829-1040 and ask an irs representative if the payment has been credited to your account. if it has not and the check has not cleared your financial institution, you may choose to place a stop-payment on the original check and send another payment.