post
https://sandbox.checkhq.com/employees//forms//submit
Submits an employee form.
Note: Employee withholdings are normally configured when employees go through Check Onboard. Use the Employee Forms API only if you're building a custom integration for employee onboarding.
Consult the Custom Employee Onboarding Guide for more information.
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For an employee with an IRS lock-in letter on file, this endpoint refuses the federal W-4 with a 400 and error type employee_federal_withholding_locked. State withholding forms are not affected. See IRS lock-in letters.