The following steps are done to reset the User Id 1.Go to GST Portal-www.gst.gov.in 2.Click on the Login Button 3.You can see "FORGOT USER NAME" Button in the bottom of the page. 4.The next page will open ,in this page you will enter your GST Number and click to generate OTP button. 5.You will receive an OTP in Registered mobile and Registered e mail. 6.Put the OTP and submit. 7.You will receive your User Name in your email.