Property taxes are due in one or more installments.
When you close on a house, the seller may have already paid taxes for time when you will live in the house, or the seller may not have paid taxes for time when he or she lived there.
Those issues will be handled at closing. The contract will explain how much one party owes for prorated taxes and how the money will be paid.
When you buy a house, you assume responsibility for outstanding taxes, unless the contract says otherwise.
Get a title insurance policy to learn about any taxes due and to be protected if you are given inaccurate information.