Self assessed Tax paid for the year 2020-21

I have paid self-assessed Tax for the year 2020-21. Amount Rs 65000. 

challan is available and it is also showing in the Annual report for the year 2020-21. 

it is not used for claiming Tax paid for years. 2020-2021.

1) Can I use the same self-assessed Tax paid in next subsequent years? How many years I can use.?

2) if any Tax I have to pay in subsequent years, can I setoff against this self-assessed tax paid.

Please advice

Thanks

Venkatesan