Idaho Estimated Tax Payments (2026)
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Reviewed byIsaiah McCoy, CPAIsaiah McCoy is a Certified Public Accountant (CPA) in Miami, Florida with over a decade of experience in tax, accounting, and financial analysis. He holds a Bachelor of Science degree in accountancy and a Master of Taxation degree from Arizona State University. Isaiah has also earned a Master of Business Administration with a finance concentration from LSU Shreveport. Isaiah has worked within several industries, including public accounting (serving clients in the natural resources, real estate, and not-for-profit sectors), higher education, and healthcare. In his free time, he enjoys traveling and watching soccer and is fluent in Spanish.Idaho doesn't require quarterly estimated tax payments. You can prepay voluntarily, but there are no mandatory installments. You'll still owe Idaho income tax when you file, plus federal estimated payments on your 1099 income. Use the calculator below to plan for both.
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Set up quarterly paymentsFull tax breakdown
Does Idaho require quarterly estimated tax payments?
No. Idaho doesn't require individual quarterly estimated payments. You can prepay voluntarily, but there are no mandatory installments. Idaho does not require quarterly estimated payments. To get the automatic filing extension and avoid the late-file penalty, pay at least 100% of prior-year tax or 80% of current-year liability by April 15; interest still accrues on any unpaid balance.
What federal estimated taxes do Idaho freelancers still owe?
Every self-employed Idaho filer still owes federal estimated taxes if they expect to owe $1,000 or more for 2026 after withholding. That includes the 15.3% self-employment tax (12.4% Social Security + 2.9% Medicare) on 92.35% of your net profit, plus federal income tax. Federal payments are due April 15, June 15, September 15, and January 15, and you can pay through IRS Direct Pay.
What deductions lower your Idaho estimated taxes?
Because estimated taxes are based on your net profit, every business write-off you claim lowers what you owe each quarter. Common deductions for 1099 workers, reported on Schedule C, include the home-office deduction, car mileage, phone and internet, software, and supplies. You can also deduct half of your self-employment tax, and the federal Qualified Business Income (QBI) deduction can remove up to 20% of your qualified business income, which flows through to your Idaho return in most states.
Keeper's 1099 tax calculator estimates your bill after deductions, and our write-off guides list the deductions for your line of work.
Note: Figures are current for the 2026 tax year and are for planning, not tax advice. Confirm the details with the Idaho State Tax Commission before you file.
How to file quarterly taxes in Idaho
In Idaho, quarterly filing is really about your federal payments — the state doesn’t require estimated installments. Here’s the process, plus how to prepay Idaho if you choose to.
- Confirm you need to pay. Federal estimated payments apply whenever income isn’t being withheld — 1099, freelance, or investment income. Self-employment income is taxable in Idaho, but the state doesn’t require quarterly estimates — you settle up when you file, though a voluntary prepayment can reduce penalties or interest.
- Calculate your federal estimate. Use the Form 1040-ES worksheet (or tax software). Estimate your full-year income, add your federal income tax and self-employment tax, subtract anything already withheld from a paycheck, and split the rest across the year. The estimate at the top of this page gives you a starting number.
- Pay the IRS. Pay through IRS Direct Pay (or EFTPS) and choose the estimated tax / Form 1040-ES option. Select tax year 2026 and save the confirmation number. This money counts only toward your federal taxes.
- Prepay Idaho if you want to (optional). To avoid a balance-due penalty or interest, send a voluntary Idaho payment through Quick Pay / TAP using Form 51. Otherwise, pay your full Idaho tax when you file.
- Repeat on each deadline. For 2026, federal estimated payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. In Idaho, quarterly installments aren’t required, so you only have to hit the federal dates — a voluntary state prepayment is optional.
Steps reflect 2026 rules and are for planning, not tax advice.
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Get started freeFrequently asked questions
No. Idaho does not require individual quarterly estimated payments, you can prepay voluntarily, but there are no mandatory installments. You still owe Idaho income tax when you file your return, plus federal estimated payments (including self-employment tax) if you expect to owe $1,000 or more federally.
Quarterly taxes by state
Hover a state to see its top income tax rate and how its quarterly payments work.