If you bought a house in 2017 I don't understand how you'd end up paying "2016" taxes. Usually property taxes are prorated between the buyer and the seller with the seller paying taxes up to the point of the sale and the buyer paying the taxes there after.
If the seller paid taxes covering the 2016-2017 fiscal year the buyer might reimburse the seller as part of the "close of escrow" process, but those taxes would be deducted in 2017 when they were paid.
