Login.gov is a secure sign in service used by the public to sign in to participating government agencies. Participating agencies, like the U.S. Department of the Treasury, will ask you to create a Login.gov account to securely access your information on their website or application. A Login.gov account is unique to each individual and there is a required authentication method along with a password.
SAM.gov - System for Award Management (SAM.gov) - is an official website of the U.S. Government. A SAM registration is required for any entity to bid on and get paid for federal contracts or to receive federal funds. These include for-profit businesses, nonprofits, government contractors, government subcontractors, state governments, and local municipalities. There is no cost to use SAM.gov. SAM.gov uses Login.gov for a secure sign in to their website.
Treasury's (Compliance and Reporting) Portal - This is a secure website through which Treasury requires all ARPA reporting to be done. To access the Portal, a user must use their unique Login.gov account that is associated with the email address that Treasury has on file for that user (this was provided during the certification process in the summer of 2021).