What tax forms are required for new hires?

Tax Forms Required for New Hires in Idaho

When hiring employees in Idaho, it is essential to collect and file the appropriate tax forms to ensure compliance with federal and state regulations. Proper handling of these forms supports accurate payroll processing, tax withholding, and reporting.

Key Tax Forms for New Employees

• IRS Form W-4 (Employee's Withholding Certificate): New hires must complete this form to determine federal income tax withholding. Employers use the information to calculate the correct amount of federal tax to withhold from wages.
• Idaho State Form 40 or 40N (Idaho Withholding Allowance Certificate): Idaho requires employees to complete a state withholding form to establish the amount of state income tax to withhold. This form is similar to the federal W-4 but specific to Idaho tax regulations.
• Form I-9 (Employment Eligibility Verification): While not a tax form, employers must complete this federal form to verify the employee’s identity and authorization to work in the U.S. It is critical for compliance and recordkeeping.

Additional Operational Considerations

• Report New Hires to Idaho Department of Labor: Employers must report all new hires within 20 days to support child support enforcement and other state programs.
• Payroll Setup: Use the information from the W-4 and Idaho withholding forms to configure payroll systems accurately for tax withholding and reporting.
• Recordkeeping: Maintain copies of all completed tax forms securely as part of employee records for audit and compliance purposes.
• Unemployment Insurance: Register with the Idaho Department of Labor for unemployment insurance tax reporting and payments related to new employees.

As of 2026, regularly review Idaho tax agency updates to stay current on any changes to withholding forms or reporting requirements.