Comparisons
ECI vs. FDAP: How nonresident income is taxed
The short answer
ECI is income effectively connected with a U.S. trade or business, generally taxed on a net basis. U.S.-source FDAP income that is not effectively connected is generally taxed at 30% of gross income unless a statutory exemption or treaty reduces the tax; the categories are not simply “active” versus “passive.”
| Aspect | ECI | Non-ECI U.S.-source FDAP |
|---|---|---|
| Main question | Connected to a U.S. trade or business? | U.S.-source income without that connection? |
| Usual tax base | Net taxable income | Gross income |
| Individual tax rate | Generally graduated rates | Generally 30%, unless reduced or exempt |
| Deductions | Connected deductions may be allowed | Generally no expense deductions |
| Withholding | Special rules may still apply | Generally collected through withholding |
| Typical examples | Qualifying U.S. business profits | Certain dividends, interest, rents, royalties |
When ECI treatment applies
First ask whether the nonresident is engaged in a U.S. trade or business and how the income relates to that activity. Services physically performed in the United States commonly create a U.S. business connection, although exceptions and treaty protections can matter. Other income may require asset-use or business-activities tests, and special rules cover real property. A U.S. bank account, U.S. customers or an LLC registration alone does not establish the answer. For a nonresident individual, ECI generally belongs on Form 1040-NR, with allowable connected expenses and the applicable individual rate structure.
When non-ECI FDAP treatment applies
FDAP means fixed or determinable annual or periodical income. The definition is broader than recurring payments: a payment need not arrive every month to qualify. Common examples include U.S.-source dividends, certain interest, rents and royalties that are not effectively connected. The general federal tax is 30% of gross income, but statutory exemptions and treaty benefits can change that result. Source rules differ by income type, so receiving dollars from a U.S. payer does not automatically make every payment U.S.-source. The withholding agent needs appropriate documentation before applying an available reduced rate or exemption.
When both apply to one taxpayer
A nonresident can have both categories in the same year, and Form 1040-NR handles them separately. For example, suppose a nonresident individual operates a qualifying U.S. business and also receives unrelated dividends from U.S. stocks. Business profit may be ECI while the dividends remain non-ECI FDAP. Rental income deserves particular attention: absent another basis for ECI treatment, U.S. real property rents can be taxed on gross income, but an eligible election may permit net-basis treatment as effectively connected income. An election carries requirements and continuing consequences; it is not simply a deduction entered at filing time.
Common confusion about tax and withholding
Withholding is a collection mechanism, not always the final tax calculation. ECI is not automatically free from withholding: partnership and real property rules can require withholding even when final tax uses net income. Conversely, some interest may qualify for a statutory exemption rather than the general FDAP rate. Do not assume that every passive receipt is non-ECI or every business receipt is taxable in the United States. Gather contracts, work locations, business records and withholding statements, then classify each income stream separately. Review documentation and return obligations together so that a missing form does not undermine an otherwise supportable tax position.
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General information, not tax advice
This page provides general educational information about U.S. federal tax rules. It is not individualized tax, legal or accounting advice, and it does not create a client relationship. Results depend on each taxpayer's specific facts.
Written by Roger I. Chirino, founder of Chirino USA Accountants & Advisors P.A.
Supported by licensed CPAs, IRS Enrolled Agents (EAs), and experienced U.S. tax professionals focused on cross-border compliance and planning.
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