AfterTaxLabIdaho income tax: what you actually pay
Idaho utilizes a flat income tax system for the 2026 tax year, applying a consistent percentage to taxable income regardless of your earnings bracket. This approach simplifies the state's revenue collection by removing complex sliding scales found in other jurisdictions. While the state aims for consistency, residents must still account for these obligations when planning their personal budgets. Please note that this content is for informational purposes only and does not constitute professional tax advice for your specific financial situation.
On a $100,000 salary the state takes $5,695 (5.70% effective) and you keep $73,485 after federal tax, state tax and FICA. Idaho ranks #44 of 51 on take-home pay.
Where $100,000 goes in Idaho
Gross to net in Idaho
How Idaho taxes wage income
Idaho maintains a flat state income tax rate of 5.70 percent on all wage income for the 2026 tax year. Unlike progressive systems that impose higher percentages on subsequent portions of your earnings, Idaho applies this single rate to the entirety of your taxable income base. This uniform application means that the share of income directed toward the state remains stable as your earnings fluctuate. Taxpayers should ensure they understand how their specific taxable income is calculated after accounting for standard deductions to determine their final state liability.
The flat tax system ensures that the burden of funding state operations is distributed proportionally across all income levels. Because the rate does not change as earnings increase, high-income earners do not move into higher tax brackets, and lower-income earners are not taxed at a lower entry-level rate. This simplicity means the effective rate remains stable for most residents. While the state level is uniform, your total financial picture may change based on how federal requirements interact with these state-specific rules and your personal exemptions.
Beyond state-level obligations, Idaho does not generally impose additional municipal income taxes. This absence of local income levies is a significant feature for residents, as it prevents the compounding tax effects seen in states with city-specific income taxes. Many people incorrectly assume that local jurisdictions can add their own income taxes on top of the state mandate, but this is not the case. Consequently, your primary focus for state-level planning remains the uniform rate applied to your taxable income throughout the fiscal year.
Idaho state income tax from $35,000 to $400,000
Single filer, no pre-tax contributions, 2026 rules. Treatment: Flat 5.70% state income tax. Effective rate is state tax divided by gross salary.
| Gross salary | Idaho state tax | Effective state rate | Take-home / year |
|---|---|---|---|
| $35,000 | $1,993 | 5.69% | $28,309 |
| $50,000 | $2,848 | 5.70% | $39,507 |
| $75,000 | $4,271 | 5.69% | $57,321 |
| $100,000 | $5,695 | 5.70% | $73,485 |
| $150,000 | $8,543 | 5.70% | $105,248 |
| $200,000 | $11,390 | 5.70% | $137,537 |
| $250,000 | $14,238 | 5.70% | $168,944 |
| $400,000 | $22,780 | 5.70% | $255,047 |
Modelled directly from published 2026 state rates used by the calculator.
Idaho state tax versus similar states
States closest to Idaho in the 2026 take-home ranking, compared on the $100,000 salary.
| State | State tax on $100,000 | Effective rate | Difference |
|---|---|---|---|
| New Jersey | $5,500 | 5.50% | $195 |
| Montana | $5,900 | 5.90% | +$205 |
| Maine | $5,500 | 5.50% | $195 |
| Hawaii | $6,000 | 6.00% | +$305 |
| California | $5,344 | 5.34% | $351 |
What this means in Idaho
Understanding the state's tax framework is essential for those living or working within the region. Because the system relies on a single, uniform rate, the primary factor determining your total liability is your total taxable income. This structure differs significantly from the progressive models used by many neighbors, making Idaho a distinct case for taxpayers. Whether you are a new resident or a long-term worker, recognizing how this flat obligation functions is key to navigating the state's fiscal landscape effectively.
In practice, the flat tax system means that for a worker earning a typical salary, such as $100,000, the state takes $5,695, representing an effective rate of 5.70 percent. This predictable model allows for straightforward financial forecasting since your tax liability scales directly with your earnings. While this consistency is often favored for its simplicity, it places Idaho at a specific position nationally, ranking forty-fourth among the fifty-one states and the District of Columbia regarding take-home pay potential for individuals at that common salary level.
A common misunderstanding about Idaho's tax regime is the belief that higher salaries trigger increased tax rates. Because the state utilizes a flat system, the percentage taken does not rise as you earn more, which differentiates it from the progressive tax structures used by several surrounding states. Another misconception involves the comparison with neighbors; while some neighboring states opt for no state income tax at all, Idaho's flat model provides a middle-ground approach that keeps revenue steady without the volatility of complex, multi-tiered tax brackets found in other regions.
Idaho income tax questions
Is Idaho's income tax progressive?
No, Idaho uses a flat tax system where a single, uniform rate is applied to all taxable income. This means your tax percentage remains constant regardless of whether you earn a lower or higher salary, unlike progressive systems that increase rates at higher income tiers.
How does Idaho's tax compare to neighboring states?
Idaho's flat 5.70 percent rate sits in contrast to neighboring states that may have either no income tax or progressive tiers. Because regional neighbors vary wildly in their tax policies, Idaho’s consistent approach provides a unique fiscal environment that is neither the highest nor the lowest in the immediate geographic area.
Are there local income taxes in Idaho?
No, there are no local or municipal income taxes in Idaho. The tax burden on your wages is limited strictly to the state-level obligation, which simplifies the tax filing process for residents living in cities or counties across the state.
Does my tax rate increase if I get a raise?
Because the state employs a flat tax, your tax rate does not increase as your income rises. You will continue to pay the same fixed percentage on any additional earnings, ensuring that the portion of your paycheck going to the state remains consistent throughout your career.
Is retirement income taxed in Idaho?
Idaho has specific rules regarding the taxation of retirement income, including social security and certain pension benefits. Taxpayers should review the state's current exemptions and credit structures, as specific types of retirement income may receive preferential treatment or full exclusions depending on your age and the source of the funds.
What is the effective tax rate for a $100,000 earner?
For a worker earning a salary of $100,000, the state takes $5,695, which results in an effective tax rate of 5.70 percent. This reflects the flat nature of the system, where the effective rate remains identical to the nominal state tax rate for most taxpayers.
Sources: 2026 IRS brackets and standard deduction ($16,100 single), Social Security wage base $184,500, published 2026 state rates. Same engine as every AfterTaxLab calculator — last verified 19 Sep 2026 · methodology.