Idaho tax guide
Idaho is one of the few states that doesn't require quarterly payments, but you'll still owe the tax when you file.
Published by Cadus Labs LLC · Last updated November 9, 2026 · How we write these guides
Based on the Idaho State Tax Commission's guidance on Form 51 and on filing and paying.
Idaho doesn't require individuals to make estimated payments. You can still make them, as long as they're received by the due date of your return, using Form 51 or the state's online payment system.
Paying during the year means you won't face the whole bill at once. The federal government does expect quarterly payments, so it's often simplest to set money aside for both on the same schedule.
Wherever you live, self-employed income is subject to federal income tax and self-employment tax. A single filer with $60,000 of net profit and no other income owes about $12,037 in federal tax for 2026, or 20% of profit, before any state or local tax.
Federal estimated payments are due April 15, June 15, and September 15, 2026, and January 15, 2027. Use our 1099 tax calculator to run your own numbers.
Calculator
Enter your 1099 income and business expenses to estimate self-employment tax, federal income tax, and what to set aside each quarter. No sign-up, and nothing you type is saved.
Calculator
Turn expected profit into a practical tax savings target, then use Cadus to keep income, expenses, deductions, receipts, and reports organized.
Template
Use this worksheet to turn expected monthly profit into a practical tax savings target before estimated tax due dates arrive.
Template
Copy this table to start organizing business purchases, receipt proof, categories, and business purpose before moving records into Cadus.
Self-employment tax guide
The self-employment tax rate is 15.3%. See who pays, how the 2026 wage base works, the deduction for half the tax, and a worked example.
Estimated tax guide
2026 estimated tax due dates, who has to pay, how to avoid the penalty, and a worked example for a self-employed worker earning $60,000.
Schedule C education
Every Schedule C expense line in plain English: what goes on each one, what doesn't, and the records to keep for self-employed workers.
No. Idaho doesn't require estimated payments, but you can make them with Form 51 or online.
Yes, if you expect to owe enough. The IRS rules apply wherever you live.