So, shortly before we were scheduled to visit Dad and Stepmom, Stepmom tells me Dad got a note from the IRS about $5000+ in unpaid taxes. He had called to arrange a payment plan, but, when we got out there, we discovered he was already another $400 in the hole because the bill had first been sent out in December. With my Dad there, we used the automated system to determine the payoff amount (which was described as a having a 10-day window of accuracy), and then I set up an electronic payment from his bank account. He just got his first 'payment plan' reminder in the mail, however, and it's dated Aug19--10 days after the bill was (to the best of my knowledge) paid in full. I used the IRS' automated system to confirm the payment was received, but I can't figure out how to see if there is still a payoff amount that is remaining somehow. I ordered a tax transcript to be delivered by mail (surprise, surprise, the online transcript tool is broken), but am wondering what else I can/should do. Would his tax guy be able to help?