If you are a Singapore Citizen or Permanent Resident, your SingPass ID is either your NRIC (e.g. S1234567X) or your CPFB unique account number (e.g. SA123456Z) by default.
For Personalised Employment/Employment/Dependant/S-Pass & Work Permit holders, your SingPass ID is your Foreign Identification Number, FIN (e.g. F1234567X or G1234567Z).
However, if you have changed or forgotten your SingPass ID, visit
https://www.singpass.gov.sg > Select 'Login' > Select 'Forgot SingPass ID' > Enter your personal detailsand registered contact details. Once verified, your SingPass ID will be sent to your mobile number /email address.