Question about past due taxes..

[Rodney Byers]

I am in the process of doing my first double close on a property. The A seller owns the house outright and it has been sitting vacant for 12 years. When I pulled up tax assessment online it said taxes was past due for 2013. I put in the contract that she would be responsible for any past due tax owed on the property. My question is will I have to go pay the past due before the close or will they take it out of her proceeds at closing? I just want to make sure I am doing it right this is my first deal that had past due taxes. Thanks in advance..