State tax registration
Idaho Payroll Tax Registration
Where to register, how long it takes, and what to send us.
State income tax withholding
Withholding account (Idaho Business Registration System)
Idaho State Tax Commission
- Typical wait:
- 10 to 15 business days online (up to 4 weeks by mail)
- You'll receive:
- An Idaho withholding account number, typically 9 digits. Some notices add a suffix; only the first 9 digits are the account.
- Send Unify:
- Your Idaho withholding account number.
State unemployment insurance
Unemployment insurance account (same IBRS application)
Idaho Department of Labor
- Typical wait:
- 10 to 15 business days online
- You'll receive:
- An Idaho Department of Labor unemployment account. New employers pay 1.0% on the first $58,300 of each employee's wages in 2026.
- Send Unify:
- Your Idaho Department of Labor account number and your rate notice.
One online application covers withholding and unemployment.
Register for Unemployment insurance account (same IBRS application) (opens in a new tab)All states
Last verified September 30, 2026. Broken link? Email support@unifypayroll.com.