Dear Aspirant,

You have the income income certificate issued on 31-12-2020 which is required in the financial year of 2020-2021 and as the financial year ends on March 31 2021 then after it is required to reissue the certificate. So, you should renew it for the financial year 2021-2022. Then after the financial year ends then you have to renew it again. So, after every 31 march you have renew your income certificate.

Hope this helps.

Good Luck!