Idaho Paycheck Calculator

How Does Idaho's Flat 5.3% Income Tax Rate Impact an $85,000 Salary?

Working in the Gem State means paying a single, flat individual income tax rate of 5.30%. For a single employee earning a gross annual wage of $85,000 without extra pre-tax contributions, this flat rate and conformed federal standard deductions translate to an annual net salary of $64,957.

For those on a standard bi-weekly payroll cycle (resulting in 26 checks over the calendar year), the net deposit lands at approximately $2,498 per pay period.

This take-home amount is calculated after your employer subtracts federal taxes (estimable with our Federal Paycheck Calculator), FICA withholdings, and Idaho's flat state tax. To model custom deductions or run comparative scenarios, you can use our standard tools to run customized scenarios.

Tracing the Calculations: A Step-by-Step Walkthrough of an Idaho Paycheck

For employees who want to see how individual deductions accumulate on an Idaho paycheck stub, let's track a step-by-step example. Imagine an employee earning a gross annual salary of $90,000 who is paid bi-weekly. They contribute 6% of their gross salary to a pre-tax 401(k) ($207.69 per period) and pay $100.00 per paycheck for health insurance.

This results in the following paycheck calculations:

• Gross Period Pay: $3,461.54
• Social Security (6.2% of FICA-taxable base): $208.42
• Medicare (1.45% of FICA-taxable base): $48.74
• Idaho State Income Tax (SIT - 5.30% flat): $135.05 (annualized to $3,511.26)
• Federal Income Tax withholding (FIT): $354.23 (annualized to $9,210)
• Total paycheck deductions: $1,054.13 (including pre-tax contributions and taxes)
• Net paycheck (Take-Home amount): $2,407.41

Figure 1: Typical bi-weekly paycheck breakdown in Idaho, showing federal, FICA, and state flat tax allocations.

How Do Federal Standard Deductions Align with Idaho State Tax Rules?

Idaho conforms to the federal tax code when it comes to standard deductions. For 2026, the state standard deduction is $15,750 for Single and Married Filing Separately, $23,625 for Head of Household, and $31,500 for Married Filing Jointly.

Because Idaho utilizes a flat 5.30% rate on taxable income, there is no progressive tier climb like in neighboring progressive states. However, Idaho does conform to the federal elimination of personal exemptions (which are set to $0). This is different from progressive states like California (which has complex state standard deductions and tax credits) or flat-tax states like Colorado (which conforms to standard federal standard deductions but has a lower rate of 4.40%).

Who Pays for State Disability and Unemployment Benefits in Idaho?

Employees in Idaho are exempt from worker-funded payroll deductions for state disability and paid family leave benefits. Unlike states such as Delaware (which levies 0.40% PFML) or California (which levies a 1.30% employee SDI tax), Idaho has no worker deductions for health, leave, or disability benefits.

Idaho's State Unemployment Insurance (SUI), officially referred to as the State Unemployment Tax, is paid exclusively by employers. Idaho employers pay this rate on a set taxable wage base for each employee. By law, no portion of this tax can be deducted from your paycheck.

Figure 2: Idaho payroll tax factors showing flat 5.3% state income tax, 0% employee paid leave, and employer-only unemployment tax.

How Do You File Form ID W-4 to Adjust State Income Tax Withholding?

Your employer calculates Idaho state income tax withholding using the information provided on Form ID W-4 (Employee’s Withholding Allowance Certificate), managed by the Idaho State Tax Commission.

Form ID W-4 is used to document your state filing status and claim allowances for children or dependents. Because Idaho uses a flat tax system, coordinating allowances is critical to preventing over-withholding. To coordinate your federal withholding, submit a separate Form W-4. For detailed information on employer unemployment filings, refer to the official portal of the Idaho Department of Labor.