If you are working in the United States on a valid work visa, a 401(k) works for international employees essentially the same way it works for your U.S. coworkers: you defer part of your paycheck into the plan, your employer matches on the same terms it offers everyone else, and the money grows tax-deferred. What changes is the tax treatment on the back end. Whether the IRS classifies you as a resident or nonresident alien determines how distributions are taxed, whether treaty rates reduce withholding, and what your heirs could face if you die with a balance in the account.
Eligibility and Tax Residency
Federal law requires employers to offer benefits, including 401(k) access and matching contributions, to visa holders on the same basis as similarly situated U.S. workers.1U.S. Department of Labor. Fact Sheet 62L – What Benefits Must Be Offered to H-1B Workers H-1B, L-1, and O-1 holders all qualify. Your contributions must come from effectively connected income, meaning compensation earned for work performed in the United States; wages paid by a U.S. employer for services performed on U.S. soil almost always meet that test.2Internal Revenue Service. Effectively Connected Income (ECI)
The classification that matters most is tax residency. The IRS treats you as a resident alien if you hold a green card or pass the Substantial Presence Test, which counts weighted days of physical presence in the U.S. over a three-year window.3Internal Revenue Service. Substantial Presence Test Resident aliens are taxed on 401(k) matters the same as U.S. citizens. Nonresident aliens follow a separate set of rules. Someone who meets the presence test but keeps a tax home abroad and stronger ties there can file Form 8840 to claim the closer connection exception and remain a nonresident alien, though this option disappears once you apply for a green card.4Internal Revenue Service. Closer Connection Exception to the Substantial Presence Test
You also need a Social Security Number or Individual Taxpayer Identification Number to enroll. Most visa holders working legally in the U.S. qualify for an SSN; the ITIN is reserved for people with tax filing obligations who cannot get an SSN.5Internal Revenue Service. Topic No. 851 – Individual Taxpayer Identification Number (ITIN)
2026 Contribution Limits
Contribution limits are the same for international employees and U.S. citizens. For 2026, the maximum employee deferral is $24,500. Workers 50 and older can add $8,000 in catch-up contributions for a total of $32,500. Under SECURE 2.0, employees aged 60 through 63 get a higher catch-up of $11,250, bringing their potential total to $35,750, though not every plan has adopted this provision yet.6Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Employer Match and Vesting
If your employer matches 401(k) contributions for U.S. workers, you get the same match. An employer offering a 4% match to domestic employees cannot exclude H-1B holders.1U.S. Department of Labor. Fact Sheet 62L – What Benefits Must Be Offered to H-1B Workers Your own contributions are always 100% yours. Employer matching dollars usually follow a vesting schedule.
Federal law allows two vesting structures for the match:
- Cliff vesting: you own 0% of employer contributions until you hit three years of service, then jump to 100%.
- Graded vesting: ownership rises each year, starting at 20% after two years and reaching 100% after six years.
Vesting deserves closer attention if your visa or assignment is shorter than the schedule. A two-year rotation followed by a transfer overseas means forfeiting the entire match under cliff vesting and keeping only 20% under graded vesting.7Internal Revenue Service. Retirement Topics – Vesting Before enrolling, ask HR which schedule your plan uses and how much you would keep if you left after one, two, or three years.
Enrollment Paperwork
Which tax form you complete at enrollment depends on your residency status. Resident aliens file Form W-9, which certifies your taxpayer identification number and confirms you are a U.S. person for withholding purposes.8Internal Revenue Service. Form W-9 – Request for Taxpayer Identification Number and Certification Nonresident aliens file Form W-8BEN, which establishes foreign status and lets you claim treaty benefits that could reduce withholding on future distributions. Part II of the W-8BEN is where you identify the treaty article and the reduced rate you are claiming, and you need your foreign tax identification number to complete it.9Internal Revenue Service. Instructions for Form W-8BEN
Both forms are signed under penalty of perjury. Getting the details right at enrollment saves trouble later, particularly if your residency status changes or you leave the country and take distributions under different tax rules.
How Withdrawals Are Taxed
Distributions are where the resident/nonresident split becomes real. Resident aliens are taxed the same as U.S. citizens: distributions count as ordinary income at graduated rates.10Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Exempt Trust Nonresident aliens face a flat 30% federal withholding on 401(k) distributions as U.S.-source income. Plan administrators must withhold at that rate unless you give them valid documentation for a lower treaty rate.11Internal Revenue Service. Plan Distributions to Foreign Persons Require Withholding The 30% figure comes from 26 U.S.C. 871(a), which taxes nonresident aliens on fixed or determinable U.S.-source income.12Office of the Law Revision Counsel. 26 USC 871 – Tax on Nonresident Alien Individuals
Treaty Rates That Reduce the 30%
The United States has income tax treaties with dozens of countries, and many include provisions covering pension and retirement income. Canada, the United Kingdom, Germany, India, Japan, Australia, and France all have active treaties, though the specific reduced rate for pension distributions varies by agreement.13Internal Revenue Service. United States Income Tax Treaties To claim a reduced rate you need a completed Form W-8BEN on file with the plan administrator before the distribution goes out. If your country’s treaty has been terminated or suspended (Hungary’s treaty ended effective 2024, for example), the full 30% rate applies.
Most treaties contain a saving clause that prevents U.S. citizens and residents from using treaty benefits to reduce tax on U.S.-source income. In practice, treaty benefits typically help only after you have left the country and become a nonresident alien.
The Early Withdrawal Penalty
For resident aliens, the rules track U.S. citizens: withdrawals before age 59½ trigger a 10% additional tax on top of ordinary income tax, unless a listed exception applies.14Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
For nonresident aliens, the answer is less clear. The Section 72(t) penalty applies as an additional tax on amounts includible in gross income, but nonresident alien 401(k) distributions are often taxed under the separate flat-rate regime of Section 871(a) rather than through the normal income tax computation. Some practitioners argue this means the 10% penalty does not apply to nonresident aliens; others maintain it does. If you are a nonresident alien considering an early withdrawal, talk to a cross-border tax advisor before taking the money.
Filing Form 1040-NR
Nonresident aliens who receive 401(k) distributions must report them on Form 1040-NR. Filing lets you reconcile the 30% withheld against your actual tax liability, and if your effective rate is lower because of treaty benefits or deductions, you can claim a refund for the over-withheld amount. Skip the filing and you forfeit any refund you might be owed.15Internal Revenue Service. NRA Withholding
What Happens When You Leave the United States
Leaving the country does not force you to cash out. Most former employees can leave the balance in the old employer’s plan, where it keeps growing tax-deferred. There is no penalty for keeping the account open after departure, and this is often the simplest choice, particularly if you might return or want to avoid triggering 30% withholding on a lump-sum distribution.
You can also roll the 401(k) into a traditional IRA, or in some cases a Roth IRA. A direct rollover from a traditional 401(k) to a traditional IRA is not a taxable event and preserves tax deferral. Converting to a Roth IRA triggers income tax on the full converted amount, since you are moving pre-tax money into an after-tax account. Rollovers to non-U.S. retirement accounts are not permitted under U.S. tax law.
The practical hurdle is that many U.S. financial institutions restrict account access for people with foreign addresses. Some plan providers and IRA custodians require a U.S. mailing address, limit online transactions, or freeze certain features for participants living abroad. You do not lose the money, but routine tasks like changing investment allocations or requesting distributions can get harder. A trusted contact with a U.S. address helps, though not every provider accepts virtual mailboxes.
Required Minimum Distributions From Abroad
Wherever you live, you must begin required minimum distributions from a traditional 401(k) at age 73.16Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs) Living outside the United States does not waive the obligation. If you are a nonresident alien at that point, each RMD is subject to the 30% withholding or a lower treaty rate.11Internal Revenue Service. Plan Distributions to Foreign Persons Require Withholding Missing an RMD triggers a steep excise tax on the amount you should have withdrawn, so the deadline matters even from overseas.
Estate Tax Exposure for Non-Citizens
This is the rule that surprises people most. A U.S. citizen or permanent resident who dies with a 401(k) balance benefits from a federal estate tax exemption that shields millions of dollars. A nonresident alien not domiciled in the United States receives a unified credit of just $13,000 under 26 U.S.C. 2102, which effectively exempts only about $60,000 of U.S.-situated assets from estate tax.17Office of the Law Revision Counsel. 26 USC 2102 – Credits Against Tax A 401(k) balance counts as a U.S.-situated asset. Any value above roughly $60,000 faces federal estate tax rates up to 40%.
Some estate tax treaties provide more favorable treatment, but these are far less common than income tax treaties. If you have built a meaningful 401(k) balance and plan to leave the U.S. permanently without becoming a citizen, get in front of the estate tax question with a planning attorney before the account grows large enough to hurt your heirs.