How many years can I go back to correct a mistake on Schedule A?

[minggay2019]

I just realized that I may have mistakenly overstated real estate taxes on Schd A of my past returns.   How far back can I go to amend my past returns to correct this mistake?   

[Rachel_W]

After filing your original return, you must file an amended return by the later of these dates if you need to change your Schedule A:

• Three years from the date you filed your original return
• Two years from the date you paid the taxes on your return

So for most people who file their return each year by April 15th, you can file Amended returns for 2017, 2016, and 2015 at this time.