If you hold an L1 visa and spend most of the year working in the United States, you are almost certainly a resident alien for U.S. federal income tax purposes. Immigration law classifies the L1 as a nonimmigrant visa, but the IRS applies its own residency formula based on days physically present in the country, not on visa type. Once you cross the threshold, you owe federal income tax on your worldwide income, the same as a U.S. citizen.
Why L1 Holders Almost Always Meet the Substantial Presence Test
The IRS has two residency tests: the green card test for lawful permanent residents and the substantial presence test for everyone else.1Internal Revenue Service. Determining an Individual’s Tax Residency Status Most L1 workers arrive without a green card, so the substantial presence test is what decides their status.
You meet the test if you are physically present in the United States for at least 31 days during the current calendar year and your weighted day count reaches 183 across a three-year window. Every day in the current year counts in full, each day in the prior year counts as one-third of a day, and each day two years back counts as one-sixth.2Internal Revenue Service. Substantial Presence Test
For a full-time L1 transferee this calculation is usually academic. You will typically clear 183 days in a single calendar year on your own. The IRS illustrates the point with an L1 holder who arrives April 30 and accumulates 246 days by December 31, hitting resident status by late October of that first year.3Internal Revenue Service. Tax Residency Status Examples
Some visa holders can exclude days from the count as “exempt individuals” — foreign government officials on A or G visas, teachers and trainees on J or Q visas, students on F, J, M, or Q visas, and certain professional athletes. L1 is not on that list.2Internal Revenue Service. Substantial Presence Test Every day you spend in the United States on an L1 counts.
What Changes Once You Are a Resident Alien
Resident alien status pulls your worldwide income into the U.S. tax net. Interest on a savings account back home, rent from a property abroad, gains in a foreign brokerage account, dividends from a foreign employer’s stock plan — all of it belongs on your U.S. return.4Internal Revenue Service. Alien Taxation – Certain Essential Concepts
You file Form 1040, the same return U.S. citizens use, and you get the same standard deduction, itemized deductions, and tax credits.5Internal Revenue Service. Topic No. 851, Resident and Nonresident Aliens That access matters. Nonresident aliens cannot claim the standard deduction at all. For 2026, the standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Double taxation is a real risk when your home country also taxes income you earned there. The foreign tax credit, claimed on Form 1116, is the main tool for relief. It does not always wipe out the overlap entirely, especially when foreign rates are lower than U.S. rates, but it credits what you paid abroad against your U.S. liability on the same income.
Your First Year: Dual-Status Returns
Resident status does not reach back to January 1. Your residency starting date is the first day you were physically present in the United States during the year you met the substantial presence test.7Internal Revenue Service. Residency Starting and Ending Dates Arrive April 30 and meet the test later that year, and your residency begins April 30.
That split produces a “dual-status” year. Before your residency start date you are a nonresident alien, taxed only on U.S.-source income. From the start date forward you are a resident alien, taxed on worldwide income. If you are a U.S. resident on December 31, you file Form 1040 with “Dual-Status Return” written across the top and attach a Form 1040-NR marked “Dual-Status Statement” covering the nonresident portion.8Internal Revenue Service. Taxation of Dual-Status Individuals The deadline is April 15 of the following year. By year two, the dual-status complexity usually disappears and you file a standard full-year Form 1040.
The First-Year Election
If you arrive late enough that you do not meet the substantial presence test in your arrival year, you may still elect resident status for that partial year under IRC Section 7701(b)(4). You must have been a nonresident alien the prior year, be physically present at least 31 consecutive days in the arrival year, be present at least 75% of the days from the start of that 31-day period through December 31, and meet the substantial presence test the following year.9Internal Revenue Service. First-Year Election Under IRC Section 7701(b)(4)
Why opt into a higher tax bill? Usually to file jointly with a spouse and capture the larger joint standard deduction and wider brackets. You make the election by attaching a statement to Form 1040; there is no separate form.
The Closer Connection Exception
If you meet the substantial presence test through the three-year lookback but were present fewer than 183 days in the current year, you may be able to remain a nonresident by claiming a closer connection to a foreign country. You must have maintained a tax home there for the entire year and must not have applied for, or have pending, a green card.10Internal Revenue Service. Closer Connection Exception to the Substantial Presence Test For a typical full-time L1 holder this is a dead end: you will usually be present well over 183 days, and many L1 holders eventually file for permanent residence, either of which disqualifies you. You claim the exception on Form 8840.
Reporting Your Foreign Accounts and Assets
Once you are a resident alien, two separate foreign-asset reporting regimes kick in. L1 holders often miss them, and the penalties are heavy.
FBAR (FinCEN Form 114)
If your foreign financial accounts, in combination, exceed $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts.11Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) The $10,000 figure is aggregate across all accounts, not per account. Two accounts whose combined balance tops $10,000 for a single day both get reported.12Financial Crimes Enforcement Network. Reporting Maximum Account Value
The FBAR is filed electronically through FinCEN’s BSA E-Filing system, separate from your tax return. The deadline is April 15, with an automatic extension to October 15 that requires no paperwork.11Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) FBAR penalties alone can reach $10,000 per unreported account for non-willful violations.
Form 8938 (FATCA)
A separate rule under the Foreign Account Tax Compliance Act covers “specified foreign financial assets,” a broader category that includes foreign stocks, partnership interests, and certain insurance or pension contracts. For a single filer living in the United States, Form 8938 is required when specified foreign assets exceed $50,000 on December 31 or $75,000 at any point during the year. Married couples filing jointly file at $100,000 on December 31 or $150,000 at any time.13Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets?
Form 8938 goes with your tax return. If you meet both thresholds, you file both forms; one does not substitute for the other.14Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements
Social Security and Medicare
L1 workers are generally liable for Social Security and Medicare (FICA) taxes, both as resident aliens and as nonresident aliens on work visas. The FICA exemptions that exist for students and certain exchange visitors on F and J visas do not reach L1 holders.15Internal Revenue Service. Alien Liability for Social Security and Medicare Taxes of Foreign Teachers, Foreign Researchers and Other Foreign Professionals
The important exception is a totalization agreement. The United States has bilateral social security agreements with about 30 countries, including the United Kingdom, Canada, Germany, Japan, South Korea, Australia, and most of Western Europe.16Social Security Administration. Totalization Agreements If your home country has such an agreement and your assignment is five years or fewer, you can remain covered under your home country’s system and be exempt from U.S. FICA. Your employer obtains a certificate of coverage from the home-country authority to document the exemption.
Where no agreement exists — India, China, and most of Southeast Asia, for example — you and your employer each pay Social Security at 6.2% and Medicare at 1.45% on your U.S. wages, often while you continue contributing to your home country’s system as well.
Filing Jointly With an L2 Spouse
If your spouse is in the United States on an L2 but did not independently meet the substantial presence test, you can still file jointly. Under IRC Section 6013(g), a resident alien married to a nonresident alien can elect to treat the nonresident spouse as a resident for tax purposes. Both spouses must agree, and once made the election applies to all future years until it is revoked or the marriage ends.5Internal Revenue Service. Topic No. 851, Resident and Nonresident Aliens
The cost of the election is that your spouse’s worldwide income becomes taxable in the United States too. For a spouse with little foreign income, the joint standard deduction and wider brackets usually win. For a spouse with significant earnings abroad, do the math before electing something you cannot easily reverse.
Your spouse needs an Individual Taxpayer Identification Number (ITIN) to appear on the return if they lack a Social Security number. Apply with Form W-7 and documents proving identity and foreign status; a valid passport with a U.S. entry date typically satisfies both. Submit the W-7 together with your joint return.17Internal Revenue Service. ITIN Supporting Documents
Tax Treaty Benefits and the Saving Clause
The United States has income tax treaties with dozens of countries, and those treaties can reduce or eliminate U.S. tax on certain types of income. Most treaties, however, contain a “saving clause” that allows the U.S. to tax its own residents as though the treaty did not exist. Once you cross into resident alien status through the substantial presence test, the saving clause generally strips away benefits you could have claimed as a nonresident.
The saving clause is not absolute. Many treaties contain specific exceptions that preserve particular benefits for resident aliens, sometimes with a time limit. Whether any exception reaches your situation depends on the treaty with your home country and the type of income involved. If one does apply, you claim it by attaching Form 8833 to your return and citing the treaty article. The interaction between residency, treaty provisions, and the saving clause is complex enough that a professional familiar with your country’s treaty is often worth the fee.
Deadlines To Keep In Front Of You
- Form 1040 is due April 15. Form 4868 gives you an automatic six-month extension to October 15, but any tax owed must still be paid by April 15 to avoid interest.
- FBAR is due April 15, with an automatic extension to October 15 that needs no separate filing.11Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
- Form 8938 travels with your tax return, so it follows the same April 15 or extended deadline.
- Form 8840, for the closer connection exception, must be filed by the due date of your return, including extensions.
- Keep a record of your exact U.S. entry date in your first year. It fixes your residency starting date and the split between your nonresident and resident periods.