Finance · Idaho · Tax year 2026

Idaho Self-Employment Tax Calculator 2026

On $100,000 of 2026 self-employment profit, a single Idaho sole proprietor with no other income owes about $26,192: $14,130 of self-employment tax, $8,235 of federal income tax, and $3,827 of Idaho income tax. That is 26.2% of profit, or $6,548 for each quarterly estimated payment.

Against its neighbors, the same $100,000 of profit costs $2,751 more in Oregon and $3,827 less in Nevada.

State income tax: 5.3% flat
Idaho tax on $100,000: $3,827
National rank: #22 highest of 51
Set aside on $100,000: 26.2%
State estimated payments: No quarterly schedule
LLC filing fee: $100
State sales tax: 6% + local

State

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Net self-employment profit (2026)

Other income (W-2 wages, spouse, interest)

More options

Retirement + health insurance deductions

Local income tax rate (optional)

Service business (consulting, law, health, accounting, financial services, performing arts). Only matters for the QBI deduction at higher incomes.

Enter your net profit — revenue minus business expenses — to see how much to set aside and what to pay each quarter.

A 2026 planning estimate using the standard deduction, not a tax return: it ignores credits, itemized deductions, and AMT. All calculations happen in your browser. Nothing is stored.

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Idaho self-employment tax at common profit levels

2026 estimates for a single filer with no other income, using the standard deduction and no retirement or health insurance deductions. "Set aside" is the share of profit to move into a tax account; "Quarterly" is each of the four estimated payments.

Profit	SE tax	Federal income tax	Idaho tax	Total	Set aside	Quarterly
$40,000	$5,652	$1,775	$872	$8,299	20.7%	$2,075
$60,000	$8,478	$3,559	$1,857	$13,894	23.2%	$3,474
$80,000	$11,304	$5,344	$2,842	$19,490	24.4%	$4,872
$100,000	$14,130	$8,235	$3,827	$26,192	26.2%	$6,548
$150,000	$21,194	$16,413	$6,290	$43,898	29.3%	$10,974
$250,000	$29,851	$36,509	$11,368	$77,728	31.1%	$19,432

Married filing jointly

The same profit, earned by one spouse filing jointly with no other household income.

Profit	SE tax	Federal income tax	Idaho tax	Total	Set aside	Quarterly
$40,000	$5,652	$398	$10	$6,060	15.1%	$1,515
$60,000	$8,478	$1,885	$749	$11,111	18.5%	$2,778
$80,000	$11,304	$3,550	$1,734	$16,588	20.7%	$4,147
$100,000	$14,130	$5,335	$2,719	$22,183	22.2%	$5,546
$150,000	$21,194	$9,795	$5,182	$36,172	24.1%	$9,043
$250,000	$29,573	$25,154	$10,260	$64,987	26.0%	$16,247

How Idaho taxes self-employment income

Idaho starts from federal adjusted gross income (after the deduction for half of self-employment tax), then applies its own deductions, exemptions, and credits.

Standard deduction: $16,100 single, $32,200 joint, $24,150 head of household
Top rate: 5.3%; your bracket on $100,000 of profit is 5.3%.

2026 Idaho income tax brackets (single)

Taxable income over	Up to	Rate
$0	$4,811	0%
$4,811	and up	5.3%

2026 Idaho brackets (married filing jointly)

Taxable income over	Up to	Rate
$0	$9,622	0%
$9,622	and up	5.3%

Idaho vs its neighbors

The same $100,000 of 2026 profit for a single sole proprietor, run through each state's rules. Federal tax is the same everywhere, so the difference is state income tax. Against its neighbors, the same $100,000 of profit costs $2,751 more in Oregon and $3,827 less in Nevada.

State	State income tax	Total tax	Set aside	vs Idaho
Idaho	$3,827	$26,192	26.2%	—
Montana	$3,890	$26,254	26.3%	+$63
Nevada	$0	$22,365	22.4%	−$3,827
Oregon	$6,579	$28,943	28.9%	+$2,751
Utah	$4,135	$26,499	26.5%	+$307
Washington	$0	$22,365	22.4%	−$3,827
Wyoming	$0	$22,365	22.4%	−$3,827

How the gap changes with profit

Extra tax (+) or savings (−) for a single filer if the same business were based in each of its neighbors instead of Idaho.

Profit	Montana	Nevada	Oregon	Utah	Washington	Wyoming
$40,000	+$119	−$872	+$1,393	+$57	−$872	−$872
$60,000	+$7	−$1,857	+$1,878	+$140	−$1,857	−$1,857
$80,000	−$2	−$2,842	+$2,363	+$224	−$2,842	−$2,842
$100,000	+$63	−$3,827	+$2,751	+$307	−$3,827	−$3,827
$150,000	+$225	−$6,290	+$5,121	−$87	−$6,290	−$6,290
$250,000	+$561	−$11,368	+$9,875	−$901	−$11,368	−$11,368

What's different about Idaho for the self-employed

Idaho taxes income above a small zero-rate band at a flat 5.3%. The band uses 2025 figures until Idaho publishes 2026's (a difference of under $10).
Includes Idaho's $10 Permanent Building Fund tax. The refundable $155-per-person grocery credit is not included.
Idaho doesn't require estimated payments, but your prepayments must cover at least 80% of the current year's tax (or 100% of last year's) by April 15 for the automatic 6-month extension to be valid; interest runs on any unpaid tax from April 15.
Some Idaho resort cities levy their own local option sales tax on top of the 6% state rate.
Idaho's LLC annual report is free, but it must be received by the Secretary of State by the end of the month the LLC was formed, every year.

Idaho estimated payments and deadlines

Idaho collects its own estimated income tax with Form 51 (optional), separately from the IRS. Idaho doesn't require estimated payments, but to use the automatic six-month filing extension you must have prepaid at least 80% of this year's tax or 100% of last year's by April 15.

The 2026 Idaho income tax return is due April 15, 2027.

File and pay through the Idaho State Tax Commission.

LLC fees and sales tax in Idaho

Forming an LLC: $100 state filing fee.
Annual Report: no fee, every year, due by the end of your formation anniversary month.
Sales tax: 6% statewide, plus local rates in many cities and counties. Use the Sales Tax Calculator to price a sale.

A single-member LLC is taxed exactly like a sole proprietorship unless it elects S or C corporation status, so the self-employment tax figures on this page apply either way.

Idaho self-employment tax FAQs

How much should I set aside for taxes if I'm self-employed in Idaho?

For a single filer with no other income, about 23.2% of profit at $60,000, 26.2% at $100,000, and 29.3% at $150,000 for 2026, covering self-employment tax, federal income tax, and Idaho income tax. Enter your own numbers in the calculator for a personal figure.

Does Idaho tax self-employment income?

Yes. Idaho taxes self-employment profit as ordinary income at 5.3% flat rate. Idaho starts from federal adjusted gross income (after the deduction for half of self-employment tax), then applies its own deductions, exemptions, and credits.

When are Idaho estimated tax payments due for 2026?

Idaho doesn't require estimated payments, but to use the automatic six-month filing extension you must have prepaid at least 80% of this year's tax or 100% of last year's by April 15.

How much does an LLC cost in Idaho?

The state filing fee to form an LLC is $100. Annual Report: no fee, every year, due by the end of your formation anniversary month. A single-member LLC is still taxed like a sole proprietorship for federal purposes, so the self-employment tax figures above apply.

Sources and method

Computed with the Self-Employment Tax Calculator's 2026 engine and Idaho's rules from the sources below. Planning estimates, not a return. Last checked 2026-10-08.