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                   Joined July 2017
                
               
			  
			  
             
            
             Hello Rajiv
1. Download Form on page with "You have successfully filed & verified your return!" gave me Acknowledgement. 
You may check on Filing status for AY20-21 and if it shows e-verified, it should let you download Acknowledgement.
2. The taxes have to be paid by 31st July 2021 otherwise interest is charged after that.
No penalty or interest in my case.