Idaho Severance — Flat 5.3% Tax, Federal WARN, Key-Employee Non-Competes, 2026

Idaho WARN: what applies#

Idaho has no state-level mini-WARN notice statute. The operative layoff-notice regime for Idaho private employers is federal WARN (29 U.S.C. §§ 2101–2109): employers with 100 or more full-time employees must give 60 days advance written notice for a mass layoff (50+ affected at a single site of employment constituting at least 33% of the active workforce, or 500+ regardless of percentage) or a plant closing. Notice must go to affected employees (or their representatives), the Idaho Department of Labor Rapid Response unit, and the chief elected official of the local government. Federal WARN penalties: back pay and benefits for each day notice was not given (up to 60 days), plus a $500/day civil penalty payable to the local government. Idaho adds no shorter notice, no lower employer-size trigger, and no statutory severance mandate.

How severance is taxed in Idaho#

Idaho operates a FLAT 5.3% individual income tax under Idaho Code § 63-3024 — applied to all Idaho taxable income above $2,500 single / $5,000 MFJ. The rate has been on a multi-year reduction glidepath: 6.5% (2021) → 6.0% (HB 380 of 2022) → 5.8% (HB 1 of 2022 First Extraordinary Session) → 5.695% (2024 reductions) → 5.3% (effective 2025 forward, per 2024 Idaho Sess. Laws ch. 237 § 2 / HB 521 and the further 2025 Idaho Sess. Laws ch. 13 § 3 amendment). The 5.3% rate is applied to all wages including supplemental wages (severance, bonuses, commissions) — Idaho does not publish a separate flat supplemental withholding rate; the standard Idaho Income Tax Withholding Computation tables apply the flat 5.3% rate. Idaho does NOT impose any state-level local income tax on wages. On top of Idaho state withholding, severance is subject to the federal 22% supplemental rate (37% on cumulative amounts above $1,000,000 in a calendar year) and FICA (Social Security 6.2% to the wage base, Medicare 1.45% plus 0.9% additional Medicare on wages above $200,000 single / $250,000 MFJ). Idaho has no state disability insurance, no statewide paid family leave premium, and no statewide transit tax.

Calculate your situation#

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FAQ#

Does Idaho require severance pay?

No Idaho statute requires private employers to pay severance. Idaho has no state mini-WARN that would mandate pay-in-lieu of notice. The only layoff-notice regime that carries teeth in Idaho is federal WARN (29 U.S.C. §§ 2101–2109), which requires 60 days advance notice (or back pay for missed days) at employers of 100+ for covered mass layoffs and plant closings — but WARN mandates notice, not severance. Severance is therefore employer-discretionary in Idaho unless your employment agreement, written severance plan, or company handbook makes it mandatory. Idaho is an at-will employment state.

How is severance taxed in Idaho?

Idaho operates a FLAT 5.3% individual income tax under Idaho Code § 63-3024, applied to all Idaho taxable income above $2,500 single / $5,000 MFJ. The rate is the latest stop on Idaho's multi-year reduction glidepath: 6.5% (2021) → 6.0% (HB 380 of 2022) → 5.8% (HB 1 of 2022 First Extraordinary Session) → 5.695% (2024 reductions) → 5.3% (effective 2025 forward, per 2024 Idaho Sess. Laws ch. 237 § 2 / HB 521 and 2025 Idaho Sess. Laws ch. 13 § 3). The same 5.3% flat rate applies to all wages including supplemental wages (severance, bonuses, commissions); Idaho does not publish a separate flat supplemental rate. Idaho does not impose any state-level local income tax on wages. On top of Idaho state withholding, severance is subject to the federal 22% supplemental rate (37% on cumulative amounts above $1,000,000 in a calendar year) and FICA (Social Security 6.2% to the wage base, Medicare 1.45% plus 0.9% additional Medicare on wages above $200,000 single / $250,000 MFJ). Year-end Idaho liability is reconciled on Form 40 (resident) or Form 43 (nonresident/part-year).

Does Idaho have a mini-WARN statute?

No. Idaho has no state-level mini-WARN that imposes employer notice obligations independent of federal WARN. The operative regime is federal WARN (29 U.S.C. §§ 2101–2109): 60 days advance notice at employers of 100+ for mass layoffs affecting 50+ at a single site that constitute at least 33% of the active workforce (or 500+ regardless of percentage). Notice goes to affected employees, the Idaho Department of Labor Rapid Response unit, and the chief elected local official. Federal WARN penalties: back pay and benefits for each day notice was not given (up to 60 days), plus a $500/day civil penalty payable to the local government. Idaho adds no shorter notice, no lower employer-size trigger, and no statutory severance mandate.

Does OWBPA apply in Idaho?

Yes. OWBPA is federal (29 U.S.C. § 626(f)) and applies in all states. If you are age 40 or older and your Idaho employer asks you to sign a waiver of age-discrimination claims under the ADEA in your severance agreement, the waiver is enforceable only if you receive at least 21 days to consider the agreement (45 days for group exits — a 'reduction in force' or 'exit incentive program'), and 7 days after signing to revoke. Group exits additionally require disclosure of the ages and job titles of all selected and non-selected employees in the decisional unit. The Idaho Human Rights Act (Idaho Code § 67-5901 et seq.) separately prohibits age discrimination (40+) by employers with 5 or more employees — a lower threshold than the federal ADEA's 20-employee minimum, so smaller Idaho employers are still covered by state law. A release of state-law age claims under the IHRA does not require OWBPA-compliant 21/45/7 procedures, but the federal ADEA release portion still does.

Can I collect Idaho unemployment while receiving severance?

It depends on how the severance is structured. Idaho's unemployment disqualification rules are at Idaho Code § 72-1366 (Personal eligibility conditions; disqualifications) and related sections of the Idaho Employment Security Law. In practice, the Idaho Department of Labor Unemployment Insurance Division treats severance pay based on allocation: severance designated as 'wages in lieu of notice' or salary continuation tied to a specific notice period typically offsets UI benefits week-by-week during the allocated weeks; a lump-sum severance not designated to specific weeks is more likely to be allocated to the separation date. Practical takeaways: (a) file your Idaho UI claim with Idaho DOL on or shortly after your last day worked at labor.idaho.gov to establish your benefit year; (b) fully disclose the severance amount, structure, and any employer designation when you apply and on weekly certifications — failure to report severance is fraud; (c) Idaho's UI maximum weekly benefit amount is in the $499 range for 2026 — verify the live figure at labor.idaho.gov before relying on net-of-benefits figures.

Are non-competes enforceable in Idaho after a layoff?

Depends on whether you qualify as a 'KEY EMPLOYEE' under Idaho Code § 44-2702. This is Idaho's headline non-compete distinction. Idaho Code § 44-2701 permits restrictive covenants only against a 'key employee' or 'key independent contractor' as narrowly defined in § 44-2702 — typically the top 5% of an employer's workforce by compensation, or workers possessing unique knowledge or skills that would create a substantial threat to the employer's legitimate business interest if used post-employment. For workers NOT meeting the 'key employee' definition, post-employment non-competes are unenforceable from inception. For key employees, § 44-2701 still limits enforceability to covenants 'reasonable as to its duration, geographical area, type of employment or line of business, and that does not impose a greater restraint than is reasonably necessary.' Section 44-2704 establishes rebuttable presumptions of reasonableness: duration up to 18 months, geographic area corresponding to where the employer has a legitimate business interest at separation, and scope tied to the type of employment performed. HB 487 of 2018 significantly amended § 44-2703 to REMOVE a prior presumption of irreparable harm to employers seeking injunctive relief, and to require courts to balance hardship to the employee. Practical takeaway: in Idaho, confirm with an attorney whether you meet the § 44-2702 'key employee' definition before assigning value to a non-compete release. If you don't qualify, your non-compete is likely unenforceable from inception, and the release clause in your severance offer is releasing nothing. Confidentiality and non-solicitation provisions remain enforceable across both categories.

How does Idaho's glidepath to 5.3% compare to other state reductions?

Idaho's reduction from 6.5% (2021) to 5.3% (2025+) is part of a broader nationwide trend of state income-tax cuts that the Tax Foundation has tracked as '26 states enacted individual income tax rate reductions from 2021 to 2023.' Idaho's glidepath is notable for its speed and depth: 6.5% (2021) → 6.0% (HB 380 of 2022) → 5.8% (HB 1 of 2022 First Extraordinary Session) → 5.695% (2024) → 5.3% (effective 2025 forward, per HB 521 of 2024 and 2025 ch. 13 § 3). At 5.3%, Idaho's flat rate is meaningfully lower than several states with graduated structures whose top rates are higher (Hawaii 11.0%, Oregon 9.9%, Minnesota 9.85%, Vermont 8.75%, New York 10.9%, California 13.3%), but still notably higher than the lowest-tax-state-with-an-income-tax peers (Arizona 2.5%, North Dakota 2.50% top bracket, Indiana 2.95%, Pennsylvania 3.07%, Louisiana 3.0%, Kentucky 3.5%, Iowa 3.8%, Arkansas 3.9%, Mississippi 4.0%, Michigan 4.25%, Ohio 2.75% — and the no-income-tax states AK, FL, NV, NH, SD, TN, TX, WY).