Why the United States?

The United States is the world’s largest economy and its largest consumer market, offering unmatched access to capital, a deep talent pool, and leading innovation ecosystems in tech, biotech, and finance, plus USMCA trade access to Canada and Mexico.

This guide explains how the United States corporate tax system treats foreign-owned businesses in 2026: the federal rate, state taxes, filing deadlines, estimated payments, and withholding on profits sent abroad. As the Tax Policy Center notes, US corporations owned by foreign multinationals generally face the same rules as US-owned corporations.

United States Corporate Tax at a Glance: 2026

The table below summarizes the key 2026 figures from PwC Worldwide Tax Summaries and OECD statistics. For context, corporate income tax revenue is the third-largest source of total federal revenue — after individual income taxes and payroll taxes — recently around 1.6% to 1.8% of gross domestic product (GDP).

Federal Corporate Income Tax: A Flat 21%

The Tax Cuts and Jobs Act (TCJA) of 2017 replaced graduated brackets that topped out at 35% with a flat federal corporate income tax rate of 21%. The tax applies to a C corporation’s taxable income under the Internal Revenue Code — net income after deductions such as cost of goods sold, wages, interest, and depreciation.

Only C corporations pay the 21% rate at the entity level; shareholders are taxed again on dividends and capital gains — the familiar double taxation. Other structures pass profits through to their owners. Here is how taxes on corporate income reach each entity type:

• C corporation — pays the 21% federal CIT on taxable income; shareholders pay a second layer on dividends and capital gains.
• S corporation — a pass-through with no entity-level federal income tax; non-resident aliens generally cannot be S corporation shareholders.
• Partnership or multi-member LLC — pass-through taxed at owner level; a multi-member LLC files Form 1065.
• Foreign-owned single-member LLC — a disregarded entity that must still file Form 5472 with a pro-forma Form 1120 each year.

Minimum Taxes and Anti-Abuse Rules

Beyond the flat 21%, several minimum taxes sit on top of the regular system, aimed at very large corporations. Foreign-owned groups should know the thresholds:

• Corporate alternative minimum tax (CAMT) — a 15% minimum tax on adjusted financial statement income for corporations whose 3-year average of that income exceeds USD 1 billion (USD 100 million US-side for foreign-parented multinational groups).
• Base erosion and anti-abuse tax (BEAT) — an additional minimum tax on corporations with 3-year average gross receipts of at least USD 500 million that make deductible payments to related foreign persons; 10.5% for tax years beginning after 31 December 2025.
• GILTI and FDII — the TCJA’s regimes for US multinationals’ foreign income: global intangible low-taxed income (GILTI) sets a minimum tax on certain foreign earnings; foreign-derived intangible income (FDII) rewards export income with a deduction.

State Corporate Income Tax and Sales Tax

States add their own layer to the United States corporate tax bill. State CIT generally runs from 1% to 10% and is deductible for federal CIT purposes. In 2026, per the Tax Foundation, 44 states levy a CIT: North Carolina has the lowest flat rate at 2.0%, New Jersey the highest top rate at 11.5%. Nevada, Ohio, Texas, and Washington levy gross receipts taxes instead; South Dakota and Wyoming levy neither. Where you place your business activities shapes the burden.

There is no federal VAT. Instead, most states and many localities impose sales tax — statewide rates of roughly 4% to 10% where imposed, with five states levying none — and use tax may apply. Many states and local governments also tax real property, and most states tax business personal property.

Deadlines and Estimated Payments

The United States corporate tax calendar runs pay-as-you-go. For a calendar-year C corporation, four points matter:

1. File the federal CIT return by April 15; a 6-month extension to October 15 is available.
2. Pay estimated tax in four equal installments — April 15, June 15, September 15, and December 15 for calendar-year corporations.
3. The fourth installment falls on the 15th day of the 12th month; any remaining balance is due with the return by April 15.
4. State income tax returns usually follow the federal due date, with a few exceptions.

Withholding Tax for Foreign Owners

Withholding tax (WHT) is where foreign ownership matters most. US-source dividends, interest, and royalties paid to non-residents are taxed on a gross basis at 30% unless an applicable tax treaty reduces the rate. For owners from treaty countries the rate can drop sharply — the US–China income tax treaty rates are shown below as an example.

Treaty relief is never automatic: the payee must document entitlement before payment, and the result depends on the treaty with the owner’s home country. Checking treaty access early is one of the most valuable structuring steps.

Frequently Asked Questions