Idaho Withholding Tax: How to Register, Deposit and File as an Employer

If you pay anyone for work performed in Idaho, you are almost certainly responsible for Idaho withholding tax. This guide walks through the sequence that works: get a federal EIN, register with the Idaho State Tax Commission, learn the filing cycle the agency assigns to you, and meet the January and February deadlines. Follow the steps in order, because each one depends on the one before it.

Disclaimer: This guide is informational content, not legal or tax advice. Withholding obligations can depend on your entity type, payroll setup and where your employees work. For complex situations, talk to a qualified CPA or attorney before you file.

Who Needs an Idaho Withholding Account

You need an Idaho withholding account if any employee earns income while working in Idaho. The rule covers the obvious cases, such as a full-time office worker in Boise, and the ones owners often miss: agricultural workers, household employees and family members on your payroll. If you pay someone wages for work done in Idaho, plan to register before the first payday.

Step 1: Get a Federal EIN First

Your Idaho registration uses your federal Employer Identification Number (EIN), so you need the EIN before you start. Apply for it with the IRS. If you operate as an LLC or corporation, the state entity must exist before the EIN is useful for registration, so form the entity first.

For an LLC, the Certificate of Organization costs $100 to file online or $120 on paper. You file it with the Idaho Secretary of State through SOSBiz at sosbiz.idaho.gov/forms/business. Expedited handling is available for an added surcharge: $40 for evidence of filing within 8 working hours, or $100 for same day service on filings received before 1:00 p.m. Mountain time. Idaho LLCs also file an annual report every year, due before the end of the month in which the Certificate of Organization became effective, beginning one year after formation. The annual report fee is zero, but the filing is still required.

Step 2: Register Through the Idaho Business Registration (IBR) Application

Register at the Tax Commission's IBR application at tax.idaho.gov/ibr. Use the exact employer name and EIN that appear on your W-2s. A mismatch between the name on your withholding account and the name on your W-2s creates reconciliation problems at year end, so check the spelling and entity type before you submit.

Keep two rules in mind about the account number:

• The account number is not transferable. A new owner, a new EIN or a new entity type each requires a new account.
• Idaho's registration is a registration, not a license. Idaho has no state general business license, and registering your employer account does not create one.

Failing to register carries a $100 per day civil penalty. Register before you run payroll, not after the first notice arrives.

Step 3: Keep Withholding Separate From Your Other State Accounts

Idaho withholding is filed and paid in TAP, the Tax Commission's online filing system. It is a separate account from your Department of Labor unemployment account and from workers' compensation coverage. Registering with the Tax Commission does not register you for unemployment insurance or workers' compensation, so set up each obligation on its own. Missing one does not excuse you from another.

Step 4: Know Your Form 910 Filing Cycle

You do not choose your Form 910 filing frequency. The Tax Commission assigns a cycle when you register, and your deadlines follow from it. Confirm your assigned cycle in your TAP account once registration is complete.

Assigned cycle	Form 910 due date
Monthly	The 20th of the month after the period
Semimonthly	The 5th and the 20th
Quarterly	The last day of the month after the quarter ends
Annual	The last day of January

If you withheld nothing during a period, you still file a zero return. A missed zero return is a missed filing, so put every assigned due date on your calendar as soon as you receive it.

Step 5: Calculate What to Withhold

Idaho's income tax is a flat 5.3%. The rate fell from 5.695% in 2024 to 5.3% for 2025, so payroll settings carried over from an older year may be wrong. Idaho withholding tables are built on the 5.3% flat rate, and bonuses are withheld at 5.3%. Check the current year's rate and tables with the Tax Commission before you set up payroll, and recheck them each January.

Step 6: Meet the Annual Deadlines

Three annual items come due in the first quarter of the year:

• Form 967 and W-2s: due the last day of January.
• 1099s: due the last day of February.
• Form 910 annual cycle, if assigned: due the last day of January.

Build these into your year-end process early. Waiting until the last week of January leaves no room to fix a name or EIN mismatch.

Owners Taking Pass-Through Income

Nonresident owner withholding on pass-through income is a separate obligation from employee withholding. It is reported on Form PTE-01. Whether it applies to you depends on your entity type, who your owners are and where they live. The Tax Commission's guidance on nonresident owners, found at tax.idaho.gov, explains the rules. Confirm them with the Tax Commission or your CPA before you assume the requirement does or does not apply.

Other Idaho Requirements That Come Up Alongside Withholding

Employers often discover these items while they are setting up payroll. Each one is separate from withholding.

• State business license: Idaho does not have one. Business.Idaho.gov says it plainly: registering your business is a registration, not a license. The Business Wizard at business.idaho.gov builds a checklist of the agencies and permits your specific activity needs.
• Contractors: Idaho has no statewide general contractor license. Contractors register with the Idaho Contractors Board at DOPL.
• Counties: Counties issue no general business license.
• Cities: Some cities require a general business license, and others license only specific activities. Check with your city clerk, because the answer depends on the city where you operate.
• Assumed business name (DBA): You file it with the Idaho Secretary of State, not the county. It costs $25 online or $45 on paper, and the $45 paper fee includes a $20 manual data entry surcharge.
• Sales tax: The state sales tax rate is 6%. There is no local sales tax outside voter-approved resort cities. Sales tax permits are handled through tax.idaho.gov/ibr.
• Short-term rentals: Since July 1, 2026, no city or county may require a license, fee, permit or registration for a short-term rental under HB 583. State and local lodging taxes still apply.

Common Mistakes to Avoid

• Starting payroll before the withholding account exists. Failing to register carries a $100 per day civil penalty.
• Registering under a name or EIN that does not match your W-2s.
• Assuming one account covers withholding, unemployment and workers' compensation.
• Reusing an account after a sale, an EIN change or an entity type change. Those changes require a new account.
• Skipping zero returns in quiet periods.
• Relying on last year's rate or tables without checking the current figures.

Withholding Setup Checklist

1. Form the entity if you have not already, and confirm the exact legal name.
2. Obtain your federal EIN.
3. Register through the IBR application at tax.idaho.gov/ibr using the same name and EIN as your W-2s.
4. Confirm your assigned Form 910 cycle in TAP.
5. Set up payroll using the current 5.3% flat rate tables.
6. File Form 910 and pay on each assigned due date, including zero returns.
7. File Form 967 and W-2s by the last day of January, and 1099s by the last day of February.
8. Check your city clerk for any local general business license or activity license.

For official forms, rates and deadlines, start at the Idaho State Tax Commission at tax.idaho.gov. If you are new to running a business in Idaho, the Idaho Small Business Development Center at idahosbdc.org offers free advising. Because this article is informational and not legal or tax advice, have a qualified CPA or attorney review your payroll setup, especially if you have owners who live outside Idaho or employees in more than one state.