The addW4Information
API is used to collect federal tax withholding information from employees for accurate payroll tax calculation.
This is a mandatory step in the user onboarding flow. Federal tax information is required for all employees to ensure proper tax withholding and compliance with IRS regulations.
Basic authentication header of the form Basic <encoded-value>
, where <encoded-value>
is the base64-encoded string username:password
.
The response is of type object
.