That information is available on this website. You will need your Parcel ID, it is 12 numbers long and can be found on your Real Estate Bill (do not use dashes). Go to PAY BILLS and click the online link. For Calendar Year 2017 you will need to view the 2017 bills for the February and May payments and then go back and view the 2018 bills for the August and November bills. Click on the left View payments/adjustments and check the date that the payments were actually posted, only payments posted in Calendar Year 2017 can be used as a deduction on your 2017 Income Tax Filing.