Aadhaar has become an integral part of all the compliances as it serves as a universal identity across the country.

Aadhaar is mandatory to quote while filing an ITR since the Finance Act 2017 introduced a new section 139AA in the Income Tax Act 1961 which makes quoting of Aadhaar/Enrolment number mandatory for filing of return.

Section 139AA says Every person who is eligible to obtain Aadhaar number shall, on or after the 1st day of July, 2017, quote Aadhaar number 
i) In the application form for allotment of permanent account number
ii) In the return of income

Provided that where the person does not possess the Aadhaar Number, the Enrolment ID of Aadhaar application form issued to him at the time of enrolment shall be quoted in the application for permanent account number or, as the case may be, in the return of income furnished by him.

Thus while filing your return through Quicko it becomes mandatory to collect and report your Aadhaar number to comply with the Income tax act. 

We understand that the data entered on Quicko is sensitive and can make one skeptical about the safety of the data. So, you can read about How does Quicko ensure the safety of my data.