State guide · Idaho · 2026 rules

S corporation in Idaho: what the election changes

Idaho adds little to the S-corp math: no entity tax in the normal case, no annual report fee, and unemployment tax on your salary.

Updated October 24, 20267 official sources

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You’ll need: last year’s Schedule C (line 31) and the W-2 from any job you also hold. Everything else starts at a typical value you can change.

State where the business is Each state treats the election differently. The check shows only the questions that matter there.

Net profit for the year, before paying yourself Your business's profit after expenses. Money you take out for yourself does not lower it.

Where do I find this?

Schedule C, line 31 (“Net profit or (loss)”) on last year’s return.

For this year: sales minus business expenses so far, scaled to a full year. Owner draws are not an expense.

Salary you would pay yourself as an S corporation What you would pay yourself through payroll. The IRS expects a reasonable salary for the work you do.

Where do I find this?

No form shows this yet: you choose it. It should be about what you would pay someone else to do your work.

The salary finder just below shows what employees in your job earn in your state or metro area. What the IRS looks at.

Salary finder: what people in your job earn (BLS)

Your job Pick the job closest to what you do most of the week.

Area Pick your metro area if it is listed. Pay varies by area.

Another job I also earn W-2 wages from a job outside this business

Typical values: change them if you know yours

Payroll service, per year typical value Published one-person prices: $492 to $684 a year (October 2026).

Where do I find this?

Your payroll provider’s price page or quote, for one employee: you. Published prices compared.

Extra tax-prep cost for the S-corp return typical value A survey average: the fee for Form 1120-S minus the fee for Schedule C (2020 fees).

Where do I find this?

Ask your preparer what a Form 1120-S (the S corporation’s own return) would cost, then subtract what you pay now for Schedule C.

Your top federal income tax rate Not sure? Keep 22%. It changes line 5 only.

Where do I find this?

Your taxable income is on Form 1040, line 15. Find the rate for that income and your filing status in the IRS rates and brackets table.

Filing status Changes the result only above $200,000 of earnings ($250,000 if married filing jointly, $125,000 if married filing separately).

Where do I find this?

The box checked under Filing Status at the top of your Form 1040.

Choose a state and enter your profit and salary to see the comparison.

The state

Idaho follows the federal S election automatically, for a corporation or an LLC taxed as an S corporation. The S corporation files Idaho Form 41S each year.

Idaho taxes an S corporation only on built-in gains and excess net passive income, which do not arise for a business that was never a C corporation. You pay the $10 permanent building fund tax on your own return, election or not.

Idaho charges no fee for the annual report, for an LLC or a corporation. The election does not change the filing.

Unemployment tax on your salary

Unemployment insurance: 1.000% for a new employer on the first $58,300 of wages in 2026. That rate includes the workforce development share. Idaho law covers services by corporate officers unless they are expressly exempted, and no exemption applies to an officer.

The optional pass-through entity tax

An S corporation can elect each year, on Form 41S, to pay Idaho tax at the entity level at 5.3%. You get a refundable credit for your share. The calculator leaves it out.

Worked examples

A single-member LLC owner, single filer, 22% federal bracket, default payroll and return costs. The figure is total tax and added costs as an S corporation compared with staying as you are.

Profit / salary	Statewide
$80,000 / $45,000	$564 lower
$120,000 / $60,000	$2,856 lower
$200,000 / $90,000	$7,636 lower

Starting payroll in Idaho

One Idaho Business Registration application sets up state withholding with the Idaho State Tax Commission and unemployment insurance with the Idaho Department of Labor.

New hire paperwork for Idaho

Other states

All state guides and the map

Sources

Federal figures: IRS Publication 15 (2026), Schedule SE and Form 2553 instructions. Every figure was read on an official page and checked a second time. Checked October 24, 2026. How we check facts.

An estimate from public rules, not tax advice.

Ready to elect? See the Form 2553 steps.

Electing S corp status