If you make a State Estimated Tax payment in January that is applied to the Fourth Quarter Tax Payment of the previous year, you would enter that state tax payment on the Schedule A for the year the payment was made.

For example: If you made a State Estimated Tax payment on January 15, 2018 to be applied to the Fourth Quarter 2017 taxes, the amount paid on January 15, 2018 would be entered in the 2018 return on Line 5a of Schedule A Prior year state and local estimates paid after 12-31-2017. This amount would not be entered on Schedule A in the 2017 return.