EideBailly, which bills itself as a top 25 CPA firm in the US, describes its new login procedures where the password is derived from the user id, and both are based on the employee's SSN.
***Please note new login procedures*** [emphasis from source document]Src: EideBailly Employee Benefits Login Page
Enter your social security number as the User Name and last four digits of that same number as your PIN. Click on the “Log in” button. A new screen will open to “Set Up Your New Account.” In the User Name and Password field, type in a unique User Name and password. The password is case sensitive and must contain at least six characters, one of which must be a number. Enter an e-mail address to be used if you lose your password. Enter a security question and answer. Click on “Create the User.”