Form 1040-NR: U.S. Nonresident Income Tax Return

Who may need to file

• Nonresident individuals engaged in a U.S. trade or business, subject to limited exceptions in the instructions.
• Nonresidents with taxable U.S.-source income whose tax was not fully satisfied by withholding.
• Nonresidents seeking a refund of excess U.S. withholding, including eligible foreign real estate sellers.

What triggers the filing requirement

• Work or business activity in the United States can create a filing obligation; analyze the activity rather than the payment address.
• U.S. rental income or a sale of U.S. real estate may require a return and supporting schedules.
• A refund claim, treaty position, or income allocation may require additional forms beyond the basic return.

When it is due

• For calendar-year filers receiving wages subject to U.S. income tax withholding, the general deadline is April 15.
• For calendar-year filers without those wages, the general deadline is June 15; weekends and legal holidays can shift dates.
• Form 4868 generally extends the filing deadline, not the payment deadline; check special rules and the applicable tax-year instructions.

Common situations

• A foreign consultant performs services physically in the United States and must evaluate U.S. business income.
• A nonresident landlord considers whether a net-basis rental income election is appropriate.
• A foreign seller reconciles FIRPTA withholding against the actual tax on a property sale.

Start with tax residency

Immigration status and tax residency are different. Review the green card test, substantial presence test, excluded days, and any applicable treaty position before choosing the return. A move during the year can produce a dual-status year that needs special presentation rather than a routine full-year nonresident return.

Separate business income from passive income

Effectively connected income is generally taxed on a net basis at graduated rates. Other U.S.-source income may instead be subject to gross-basis tax and withholding, with treaty reductions where available. The correct category determines deductions, schedules, and whether tax withheld covers the liability.

Keep business and owner filings separate

A foreign-owned disregarded LLC may have Form 5472 obligations independent of its owner’s Form 1040-NR. Conversely, an owner can need Form 1040-NR without owning an LLC. Build a filing checklist for both the individual and each entity, and retain evidence supporting income sourcing and withholding credits.

Common mistakes

• Using Form 1040 solely because ordinary consumer software defaults to a resident return.
• Treating an LLC’s EIN as a substitute for the individual’s required taxpayer identification number.
• Assuming all U.S. investment income is taxed alike or that withholding always eliminates filing.

Potential penalties

• Late filing and late payment can lead to separate additions to tax and interest, depending on unpaid tax and other facts.
• Untimely filing can jeopardize deductions connected with a nonresident’s U.S. business income under special rules.
• Separate information returns can carry their own penalties even when the income tax return shows little or no tax.

Late filing considerations

• Determine residency, filing years, income sourcing, and withholding before submitting overdue returns.
• Collect Forms W-2, 1042-S and applicable partnership or property withholding statements; evaluate an ITIN application if needed.
• Review deduction-preservation rules and any reasonable-cause request with an adviser rather than assuming an ordinary extension cures lateness.