Idaho Paycheck Calculator
Instantly estimate your Idaho take-home pay after federal income tax, Idaho’s 5.8% flat state income tax, Social Security, Medicare, and pre-tax benefit deductions.
What Is the Idaho Paycheck Calculator?
Having analyzed payroll structures across dozens of states, Idaho stands out for its simplicity. Since 2023, Idaho replaced its graduated bracket system with a single flat 5.8% state income tax rate. For employees, this means your Idaho paycheck calculator only needs to know one state rate — but the federal side still requires careful bracket math. This tool combines all the layers into one accurate, instant take-home estimate.
How to Use the Idaho Paycheck Calculator
Enter your gross pay, select pay frequency, choose filing status, set Idaho allowances, add pre-tax deductions (401k, health insurance), and click Calculate. The tool shows federal tax, Idaho state tax, Social Security, Medicare, and final take-home pay instantly.
How Idaho State Income Tax Is Calculated
Idaho’s flat 5.8% rate applies after the standard deduction ($15,000 single, $30,000 MFJ, $22,500 HOH) and personal exemptions ($4,400 per allowance). Pre-tax 401k and health insurance deductions also reduce your Idaho taxable income before the rate is applied.
| Annualized Idaho Taxable Income | Idaho Tax Rate | Notes |
|---|---|---|
| All taxable income | 5.8% (flat) | Effective for 2024 and 2025 |
| After standard deduction | 5.8% | Conformed to federal 2025 amounts |
Real-World Example: Boise Tech Worker
A software developer in Boise earning $85,000/year, paid bi-weekly, filing Single, contributing $300/period to 401k and $90 to health insurance has take-home pay of approximately $2,087 per period — saving over $1,180 annually in taxes through pre-tax elections.
FICA Taxes in Idaho
Social Security: 6.2% on wages up to $168,600 (2025 cap). Medicare: 1.45% on all wages with no cap. Unlike some states, Idaho has no state disability insurance (SDI) or employee state unemployment contributions — a distinct advantage over Oregon and California.