Idaho Paycheck Calculator (2026)

Regardless of state residency, every worker in Idaho must contribute to federal taxation and Social Security / Medicare security programs under the Federal Insurance Contributions Act (FICA):

• Federal Income Tax (IRS 2026): Calculated using 2026 IRS withholding tables after subtracting the 2026 Federal Standard Deduction ($15,000 for single filers; $30,000 for married filing jointly). On an $85,000 single salary, federal income tax equals $10,314.00 annually ($396.69 bi-weekly).
• Social Security Tax (FICA): Assessed at 6.2% on gross wage income up to the 2026 wage base cap of $184,500. On an $85,000 salary, Social Security withholding equals $5,270.00 per year ($202.69 bi-weekly).
• Medicare Tax (FICA): Assessed at 1.45% on all earned wages without an income cap. On an $85,000 salary, Medicare withholding equals $1,232.50 per year ($47.40 bi-weekly). High earners with income exceeding $200,000 ($250,000 for married joint filers) are subject to an Additional Medicare Tax of 0.9%.

Combined Federal and FICA taxes on an $85,000 single salary total $16,816.50 per year across all US states.

Idaho does not mandate separate state disability insurance (SDI) or paid family leave (PFL) employee payroll taxes. Employee pay stubs in Idaho do not include state leave deductions unless your employer offers a voluntary private disability plan.

To ensure your employer accurately withholds state and federal taxes from your paychecks in Idaho:

• State Withholding Document: Idaho uses Federal Form W-4 Only to establish state income tax withholding. Because Idaho has no state wage income tax (or relies directly on federal baseline parameters), your employer relies on your standard IRS Form W-4.
• Pre-Tax Deduction Offsets: Electing pre-tax 401(k) contributions (up to $23,500 in 2026), Health Savings Account (HSA) contributions, or pre-tax health insurance premiums lowers your taxable wage baseline for federal tax and Idaho state tax.