When I can file tax return for AY-20-21 under section 44ADA

The same happened with me, may be the site has not updated yet.We need to wait till the next update.

@ Mr Sandeep Kumar.,

Generally the forms and option for filling is updating from April and also from May end (all forms).

But,
Now as of Pandemic condition all dept not working properly. So, Forms may be available after regular workings...

Please be wait for updates...

The forms ar

Income Tax Return filing for the AY 2020-21 ( PY 2019-20 ) might get extended keeping in mind the current COVID-2019 Pandemic. The Forms will be updated since the time frame for Investments ( 80C ) and Donations ( 80G ) has been extended to 30th June 2020 for PY 2019-20. The same has been clarified by the Income Tax Department via there official Twitter handle.

So the Forms will be uploaded little late this time.