US Capital Gains Tax for Foreigners: 2026 Rates + FIRPTA

Understanding the US Capital Gains Landscape for Non-Residents

Navigating the United States tax code requires precision, particularly for foreign nationals disposing of assets within American borders. Unlike domestic residents, non-resident aliens face a distinct regulatory framework where the source of income dictates tax liability. Some international investors assume their lack of US residency exempts them entirely from capital gains obligations. However, the Internal Revenue Service maintains strict jurisdiction over gains derived from US-situs assets, creating a complex compliance environment for global wealth holders.

The fundamental principle governing this area is the distinction between Effectively Connected Income (ECI) and passive investment gains. Capital gains that are not effectively connected with a US business are generally not taxed for non-resident aliens; the flat 30% tax applies only to someone present in the US for 183 days or more during the tax year, and gains on US real property are always treated as effectively connected under FIRPTA. If the gain is effectively connected with a US trade or business, it is taxed at the same rates as for US individuals: 0%, 15% or 20% on long-term gains (up to 25% on unrecaptured Section 1250 depreciation) and up to 37% on short-term gains; the 3.8% net investment income tax does not apply to non-resident aliens. We advise clients to rigorously analyze their residency status and the nature of their US activities before executing any significant divestment strategy to avoid unexpected liabilities.

Key Regulatory Requirements and Residency Classifications

Determining tax liability begins with accurately classifying your status under the Substantial Presence Test or the Green Card Test. If you meet either criterion, the IRS treats you as a US resident for tax purposes, subjecting your worldwide income to standard capital gains rates. Conversely, those failing these tests are classified as non-resident aliens, triggering the specific withholding rules outlined in IRC Section 1445. This section generally requires buyers to withhold 15% of the amount realized when a foreign person sells US real property (10% when the price is $1 million or less and the buyer will live in the home, 0% at $300,000 or less), ensuring the government collects its due share regardless of the seller's compliance.

For non-resident aliens holding US real property interests, the Foreign Investment in Real Property Tax Act (FIRPTA) is the primary regulatory mechanism. Under FIRPTA, the sale of US real estate by a foreign person is treated as effectively connected with a US trade or business, and the buyer generally withholds 15% of the amount realized. This applies even if the property is sold at a loss or the seller has no other US income. We emphasize that obtaining a withholding certificate from the IRS can reduce this amount, but the initial burden of withholding lies squarely on the transferee, making pre-transaction planning critical.

The table above illustrates the stark differences in treatment based on asset type. While US stocks generally escape capital gains tax for non-residents unless they are engaged in a US trade, real property triggers immediate withholding. Understanding these nuances allows us to structure transactions that minimize exposure. For instance, holding assets through a foreign corporation rather than personally can alter the tax outcome, though this introduces Corporate Transparency Act reporting requirements and potential Section 897 complications.

Costs, Filing Procedures, and Execution Timelines

The administrative burden of selling US assets as a foreigner involves significant upfront costs and a rigid timeline. Upon the closing of a real estate transaction, the buyer must withhold 15% of the gross sales price and remit it to the IRS within 20 days using Form 8288. Failure to comply exposes the buyer to personal liability for the tax, plus interest and penalties. For the seller, this creates an immediate cash flow constraint: unless a withholding certificate reduces the amount, the excess comes back only as a refund after the seller files Form 1040-NR for the year of sale with Copy B of Form 8288-A attached.

To mitigate these delays, we recommend filing Form 8288-B prior to the closing date to request a reduced withholding amount based on the expected net gain. This requires submitting a detailed calculation of the anticipated tax liability, often necessitating a professional valuation of the asset. The timeline for IRS approval varies, but early submission is vital. Additionally, non-resident aliens must file Form 1040-NR annually to report any effectively connected income, with a deadline of June 15th for those without a US business presence, though extensions are available.

The costs associated with these filings extend beyond IRS penalties. Legal fees for structuring the transaction, obtaining tax residency certificates, and navigating treaty benefits depend on complexity and are agreed with the adviser. Furthermore, if the property is held through a US corporation that is 25% or more foreign-owned, a US single-member LLC owned by a foreign person, or a foreign corporation engaged in a US business, Form 5472 is required; the penalty for not filing it is $25,000 per form, plus $25,000 for each 30-day period the failure continues more than 90 days after IRS notice. Form 8865 is filed by US persons with interests in foreign partnerships, not by foreign owners.

Strategic Planning and Treaty Optimization

Strategic foresight is the most effective tool for minimizing capital gains exposure. Many high-net-worth individuals overlook the power of bilateral tax treaties, which the US has signed with over 60 nations. These agreements can reduce the statutory 30% withholding rate on certain income types or eliminate US tax on some capital gains, though not on gains from US real property. For example, Article 13 of the US-UK treaty leaves gains on property other than real property taxable only in the seller's country of residence, but lets the US tax a UK resident who was a US resident within the six years before the sale; gains on US real property stay taxable in the US.

Another critical strategy involves the timing of residency status changes. By carefully planning the Substantial Presence Test, a foreign investor can structure their US presence to avoid triggering resident alien status while maximizing treaty benefits. The Closer Connection Exception (Form 8840) can keep non-resident status for someone who meets the substantial presence test, but only if they were in the US fewer than 183 days during the year, kept a tax home in a foreign country and had a closer connection to that country. Holding US real estate through a foreign corporation does not take the gain outside FIRPTA: the corporation pays US corporate tax at 21% on the gain, and the CFC (Controlled Foreign Corporation) rules generally concern US shareholders rather than non-resident owners.

Comparing the outcomes of personal ownership versus corporate structures reveals significant variances in tax efficiency. Personal ownership often simplifies filing and keeps long-term gains at individual rates of up to 20% (25% on unrecaptured depreciation), but exposes the individual to direct liability and US estate tax. Conversely, a corporation pays 21% on the gain and a foreign corporation can also owe the 30% branch profits tax, so corporate structures introduce complexity and potential double taxation in exchange for keeping the property out of the owner's US estate.

Final Thoughts

The intersection of US capital gains taxation and foreign residency is a high-stakes arena where precision dictates profitability. International investors are better served by engaging with the nuances of FIRPTA, ECI, and tax treaties before a transaction closes rather than reacting to compliance requirements afterward. The 15% withholding on real estate and tax rates of up to 20% on long-term gains (37% on short-term gains) are not mere technicalities; they are material financial risks that demand sophisticated planning.

By leveraging treaty provisions, optimizing entity structures, and adhering to strict filing timelines, it is possible to significantly reduce the effective tax rate on capital gains. We stand ready to assist you in navigating this intricate landscape to ensure your investment returns are preserved and your compliance is impeccable.

This article is for informational purposes only and does not constitute legal advice. Please consult a qualified US tax adviser for guidance specific to your situation.