Idaho Side Hustle Tax Calculator
Calculate your Idaho state tax (5.70%), federal tax, and self-employment tax on 1099 income.
Last updated: January 2026 · Data from IRS Rev Proc 2024-40
Idaho side hustlers benefit from a competitive flat tax rate of 5.695% for 2025. The Gem State simplified its tax system to a flat rate in recent years, making tax calculations straightforward for freelancers and gig workers across Boise, Idaho Falls, and beyond.
How Side Hustle Taxes Work in Idaho
Idaho uses a simple flat tax system:
**Idaho state tax (2025):** - Flat rate: 5.695% on all taxable income - No brackets—everyone pays the same percentage - Reduced from 5.8% in 2024
**No local income taxes:** - Boise and all Idaho cities have no income taxes - Only the flat state rate applies
Idaho's flat tax makes planning straightforward compared to neighboring states.
What Idaho Side Hustlers Owe
Let's say you're a single filer in Boise with a $52,000 W-2 job and $14,000 in side hustle income from freelance web development, with $2,000 in business expenses.
**Your estimated taxes on the side hustle:** - Net self-employment income: $12,000 - Federal SE tax (15.3% of 92.35%): ~$1,697 - Federal income tax on side income: ~$2,640 (22% bracket) - Idaho state tax (5.695%): ~$683 - **Total additional tax: ~$5,020**
Your effective tax rate on the side hustle is about 42%.
Idaho Tax Deadlines 2025
Idaho estimated tax deadlines: - **Q1**: April 15, 2025 - **Q2**: June 16, 2025 - **Q3**: September 15, 2025 - **Q4**: January 15, 2026
Use Idaho Form 51 for state estimated tax payments.
Common Deductions for Idaho Freelancers
Idaho deductions for side hustlers: - Idaho starts with federal taxable income - All Schedule C business expenses automatically reduce Idaho taxes - Home office deduction - Business mileage (67 cents/mile for 2025) - Equipment and supplies
Idaho Side Hustle Tax FAQ
What is Idaho's tax rate on side hustles?
Idaho has a flat 5.695% income tax rate on all taxable income, including self-employment earnings. This rate applies regardless of income level.
Does Boise have a city income tax?
No, Boise and all Idaho cities do not have local income taxes. You only pay the state 5.695% flat rate plus federal taxes.
Has Idaho's tax rate been reduced?
Yes, Idaho lowered its flat rate from 5.8% to 5.695% effective 2024. The state has been working to reduce taxes in recent years.
Related State Calculators
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This calculator provides estimates only. For personalized advice, consult a qualified tax professional.
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