I paid our MD withholding for January and February on 4/17 and it should have been withdrawn on 4/18. It's now 4/24 and the money still hasn't been withdrawn. According to QB the payments went through, but when I log into MD Tax Connect it says "Underpaid" for each return that I filed and shows the account balance due as the total amount of all the returns. I contacted QB and after a lengthy conversation they directed me to call the State of MD because they said if I paid it through MD Tax Connect I'd be duplicating the payments. When i try to pay the return in MD Tax Connect I get a warning that I'm trying to make a duplicate return/payment. I've been stuck on hold trying to get through to hopefully get some answers.