An Idaho LLC pays a flat 5.8% state income tax on pass-through profit in 2026. By federal default a single-member LLC is a disregarded entity and a multi-member LLC is a partnership, so profit is taxed on the owners' returns rather than at the entity level. An S-corp election shields the reasonable-salary portion from the 15.3% self-employment tax once net income clears the $40,000-$60,000 range. Non-resident owners file a Form 5472 information return.
By federal default a single-member Idaho LLC is a disregarded entity taxed on Schedule C of the owner's 1040, and a multi-member LLC is a partnership that files Form 1065 and issues K-1s. Neither pays federal tax at the entity level. Profit passes through to the owners and is taxed on their personal returns. This default applies the moment the LLC is formed, with no election required. Idaho follows the federal classification for state purposes, so the same pass-through profit is taxed on the owners' Idaho returns at the state rate. Pass-through treatment means the LLC's profit is taxed once, at the owner level, rather than twice as a C-corporation would be. A single-member owner reports the net profit on Schedule C, and multi-member owners each report their K-1 share. The LLC itself files an informational partnership return when it has more than one member, but writes no federal income-tax check.
Idaho levies a flat 5.8% personal income tax on income that passes through the LLC to its owners. The single flat rate applies to pass-through profit regardless of income level. Because a single-member LLC is a disregarded entity and a multi-member LLC is a partnership by federal default, the LLC pays no separate Idaho entity tax; the 5.8% falls on the owners' personal Idaho returns. Idaho residents pay it on their full share of profit, and non-residents pay it on the portion sourced to Idaho activity. Idaho does not add a franchise tax or a gross receipts tax on top of the income tax, so the 5.8% is the state's whole bite on pass-through profit. An LLC with no Idaho-sourced income and no Idaho-resident owners owes no Idaho income tax, which is the case for many holding companies registered in the state only for a local footprint.
An Idaho LLC benefits from an S-corp election once net business income clears the $40,000-$60,000 range, where self-employment tax savings outweigh payroll compliance costs. Below that range the added bookkeeping costs more than it saves. The election is made by filing IRS Form 2553. It splits income into a reasonable salary, which carries payroll tax, and a distribution, which avoids the 15.3% self-employment tax. Idaho recognizes the federal S-corp election, so the state 5.8% still applies to the pass-through profit. Anonymousllc.co connects owners with a US tax preparer to run the numbers. The election adds obligations: the owner must run payroll, file quarterly employment returns, and pay a salary the IRS accepts as reasonable for the work. Those costs are the reason the election waits until net income clears the $40,000-$60,000 range, where the self-employment tax saved on the distribution portion outweighs the added compliance.
A default Idaho LLC owner pays 15.3% self-employment tax on net business income: 12.4% Social Security up to the annual wage base plus 2.9% Medicare with no cap. This is on top of the 5.8% Idaho income tax. The self-employment tax funds Social Security and Medicare, and it applies to the full net profit of a disregarded entity or partnership. An S-corp election reduces it by moving distribution income outside the self-employment base, though it adds payroll filings. A US tax preparer weighs the trade for each owner's income level. Non-resident owners with no US self-employment nexus are outside the Social Security and Medicare system and do not pay this tax, which is one reason a foreign-owned single-member LLC with no US trade or business can owe no US tax at all beyond its information filings. A US-resident owner, by contrast, pays it on the full pass-through profit under the default classification.
A non-resident who owns a single-member Idaho LLC files Form 5472 with a pro-forma Form 1120 each year, and a multi-member LLC files Form 1065 with K-1s. Whether US income tax is owed depends on effectively connected income. An Idaho LLC with no US effectively connected income owes the Form 5472 information filing but no US income tax. An LLC with US effectively connected income is subject to US income tax, and Idaho's 5.8% applies to Idaho-sourced profit. An ITIN may be needed for personal filing at $299. Anonymousllc.co partners with US tax preparers familiar with non-resident filings. Whether income is effectively connected turns on whether the LLC has a US trade or business, which a preparer assesses from the activity. A non-resident selling digital products to a global audience with no US staff or office draws a different answer than one running US-based operations. Anonymousllc.co flags the question at formation so the owner has a preparer before the first filing deadline.
Form 5472 is the IRS information return required for any US disregarded entity with 25% or more foreign ownership, filed alongside a pro-forma Form 1120. Most non-resident-owned single-member Idaho LLCs file it every year. The form reports transactions between the LLC and its foreign owner, and the penalty for missing it starts at $25,000. It is an information return, not an income tax return, so filing it does not by itself create a tax bill. Anonymousllc.co flags the requirement at formation so non-resident owners have a preparer lined up before the deadline.
No. Idaho is not one of the four anonymous states, and its 5.8% income tax and public ownership record are separate from any privacy question. Idaho discloses members or managers on the state record. A founder who wants ownership private forms a Wyoming or New Mexico anonymous LLC and foreign-qualifies it into Idaho, which does not change the tax owed on Idaho-sourced profit. Wyoming and New Mexico charge no state income tax, so an anonymous parent operating only through an Idaho registration still faces Idaho's 5.8% on Idaho activity. The Anonymous LLC service is $397 all-in through the Wyoming flagship. Privacy and tax are separate questions: a Wyoming or New Mexico parent keeps ownership off the public record, but the income tax follows where the business earns. An anonymous parent with no Idaho-sourced profit owes no Idaho income tax, while the same parent operating actively in Idaho pays 5.8% on the Idaho share regardless of where it was formed.
A single-member Idaho LLC reports profit on Schedule C of the owner's Form 1040, and a multi-member LLC files Form 1065 and issues a K-1 to each member. Idaho income is then reported on the owners' Idaho state returns at 5.8%. A foreign-owned single-member LLC adds Form 5472 with a pro-forma Form 1120, and an S-corp election shifts the entity to Form 1120-S with payroll returns. The annual report to the Idaho Secretary of State is a separate compliance filing, not a tax return, and carries no fee. Anonymousllc.co lists the exact set of forms a given Idaho LLC owes at formation.
Under the March 21, 2025 FinCEN interim final rule, domestic reporting companies are exempt from beneficial ownership information reporting. A US-formed Idaho LLC is a domestic reporting company and is currently exempt. Foreign reporting companies formed outside the US remain obligated to file, and Anonymousllc.co prepares that report at $150 each when it applies. BOI is a FinCEN compliance filing, separate from income tax, so the exemption does not change the 5.8% Idaho income tax on pass-through profit. The distinction matters for planning: BOI, Form 5472, and the Idaho income tax are three separate filings with three separate purposes. An owner can be exempt from one and still owe the others. Anonymousllc.co maps which filings a given Idaho LLC owes at formation, so a non-resident owner is not surprised by a deadline later.
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