Idaho New Employer Registration: Step-by-Step Guide

Last reviewed: July 2026

When you hire your first employee in Idaho, you trigger a series of registration requirements at the federal and state level. Missing any of these steps can result in penalties, delayed payroll, and compliance headaches. This guide walks you through everything, in order.

Registration Overview

Here's a checklist of what every new Idaho employer needs:

• ☑ Federal Employer Identification Number (EIN)
• ☑ Idaho state tax registration (Idaho State Tax Commission)
• ☑ Idaho SUI account (Idaho Department of Labor)
• ☑ Workers' compensation insurance
• ☑ New hire reporting setup
• ☑ Payroll system or software

Step 1: Get Your Federal EIN

Your Employer Identification Number (EIN) is your federal tax ID, and you'll need it for federal tax filings, state registrations, your business bank account, and payroll itself.

Apply online at IRS.gov/EIN. It's free, and you receive your EIN immediately.

Step 2: Register with Idaho State Tax Commission

Register for a withholding account with the Idaho State Tax Commission. This account is what lets you withhold Idaho state income tax from employee paychecks and remit it to the state on Form 910. Employees fill out Form ID W-4 so you know how much to withhold.

Idaho also lets you skip a separate trip to each agency. The Idaho Business Registration application registers you with the Tax Commission and the Department of Labor at the same time.

From the Payroll Desk

Don't wait until your first payroll to register. State registrations typically take 10 to 15 business days to process online. Start as soon as you know you'll be hiring.

Step 3: Register for SUI

Register for a State Unemployment Insurance account through the Idaho Department of Labor. You'll be assigned an employer account number, an initial SUI rate, and a quarterly filing schedule using Form TAX020.

SUI is an employer-paid tax on the first $58,300 of each employee's 2026 wages. New employers pay a rate of 1.0% until they build enough claims history for an experience rating. See our Idaho SUI Rates 2026 guide for details.

Step 4: Workers’ Compensation Insurance

Idaho requires workers' compensation insurance for employers with one or more employees, with only narrow exemptions for certain family members and specific occupations. Coverage needs to be active before your first employee's first day, not sometime after.

You can buy a policy from any private carrier licensed in Idaho. The Idaho Industrial Commission oversees compliance statewide, and rates depend heavily on your industry classification, so get quotes from more than one carrier.

Step 5: New Hire Reporting

Idaho law requires you to report every new hire, including rehires, within 20 days of their start date. This information goes to the state to help enforce child support orders and prevent unemployment fraud.

Report online through the Idaho Department of Labor's new hire system. See our New Hire Reporting guide for the required fields and submission options.

Step 6: Set Up Payroll

With all registrations complete, you're ready to run payroll. Before your first pay period, check a sample paycheck against Idaho and federal withholding using our free paycheck calculator, so you know what to expect before real money moves.

Federal deposits and filings run on their own schedule alongside your Idaho obligations. Our Form 941 guide covers the federal quarterly return most employers need to file once payroll is underway.

For the payroll platform itself, most Idaho small businesses do better with software built for this than with a manual spreadsheet. Gusto calculates and files both your federal and Idaho payroll taxes, handles new hire reporting automatically, and generates W-2s at year-end.

Frequently Asked Questions

How do I register as a new employer in Idaho?

Register with the Idaho State Tax Commission for a withholding account and with the Idaho Department of Labor for an SUI account. Both can be completed in one application through Idaho Business Registration at business.idaho.gov. You'll also need a federal EIN from the IRS before you start.

How long does Idaho employer registration take to process?

Online applications through Idaho Business Registration typically process within 10 to 15 business days. Apply as soon as you know you're hiring so your account numbers are active before your first payroll.

Do I need workers' compensation insurance in Idaho?

Yes, in nearly every case. Idaho requires workers' compensation coverage for employers with one or more employees, with only narrow exemptions. The Idaho Industrial Commission oversees compliance statewide.

What is Form ID W-4 and who fills it out?

Form ID W-4 is Idaho's state withholding certificate. Every employee completes one in addition to the federal Form W-4, since Idaho's allowance calculation works differently from the federal one.