US Tax Residency Tests Explained: Green Card Test vs Substantial Presence Test (2026)

Meet Rohan. He landed in San Jose on an L-1 visa on August 1, 2025, and by December 2025 he’d spent about 150 days in the US that year. In early 2026, a colleague tells him, “Don’t worry, you’re a nonresident, you don’t need to report your India income.” Rohan almost believes it — until he runs the actual math and realizes he crossed into resident alien territory months ago, with real consequences for his Indian mutual funds and fixed deposits.

This mix-up is extremely common. In our US Federal Income Tax Explained (2026 Guide), we introduced the two tests that decide your US tax residency. This article goes deeper: the exact mechanics of the Green Card Test and the Substantial Presence Test, worked day-count examples, key exceptions, and what changes once you cross the line from nonresident to resident.

In over two decades of advising cross-border taxpayers, this is one of the most frequent misclassifications I come across among Indian professionals moving to the US — usually because visa status and tax residency are wrongly assumed to be the same thing. — Vipin Goel

🪪 Why This Classification Matters

Your residency status for tax purposes determines:

• Whether the IRS taxes your worldwide income (resident alien) or only US-source income (nonresident alien)
• Which form you file — Form 1040 or Form 1040-NR
• Whether you can claim the standard deduction
• Whether foreign accounts (bank, FD, mutual funds in India) need to be reported at all this year

👉 What to do next: Run both tests below before assuming your visa type tells you the answer — it doesn’t, by itself.

🟢 Test 1: The Green Card Test

This one is simple. If you were a lawful permanent resident (Green Card holder) at any point during the calendar year, you are a resident alien for tax purposes — for that entire year, starting from the day your status became effective.

• Physical presence in the US is irrelevant once you hold a Green Card — you’re taxed as a resident even if you spend most of the year outside the US.
• This continues every year until you formally abandon your Green Card or it’s revoked — simply not living in the US does not end your tax residency.
• Giving up a Green Card can trigger its own separate tax consequences (the “expatriation” rules) if you’ve held it long enough — a specialized topic beyond this article.

📅 Test 2: The Substantial Presence Test (SPT)

If you don’t hold a Green Card, the SPT decides your status using a weighted day-count formula across three years, as published in IRS Publication 519, U.S. Tax Guide for Aliens. You are a resident alien if:

• You were physically present in the US for at least 31 days during the current year, AND
• The sum of the following equals 183 days or more:
  • All the days you were present in the current year, plus
  • 1/3 of the days you were present in the first prior year, plus
  • 1/6 of the days you were present in the second prior year

Worked Example

205 is above the 183-day threshold, and the person was present at least 31 days in the current year — so this person meets the SPT and is a resident alien for 2026, even though they weren’t in the US anywhere close to 183 actual days this year.

🚫 Exempt Individuals — Days That Don’t Count

Certain visa categories don’t count their days toward the SPT at all, for a limited period:

• F-1 and J-1 students — generally exempt for parts of 5 calendar years
• J-1 teachers, trainees, and researchers — generally exempt for parts of 2 out of the last 6 calendar years
• Certain foreign government-related individuals and professional athletes competing in charitable events

This is why many students on F-1 status remain nonresident aliens for several years even while physically present in the US almost every day — their days simply aren’t counted during the exempt period. Once the exempt period ends, the SPT applies normally going forward.

👉 What to do next: If you’re on F-1/J-1 status, track exactly which calendar years count as your exempt years — the exemption is time-limited, not indefinite.

🔀 Special Situations Worth Knowing

Dual-Status Aliens

If you become a resident partway through the year (common in the year you first arrive or first meet the SPT), you may be a dual-status alien — nonresident for part of the year, resident for the rest. This requires special return preparation and generally cannot use the standard deduction for the nonresident portion.

First-Year Choice Election

In some cases, someone who doesn’t yet meet the SPT in their arrival year can elect to be treated as a resident alien for part of that year, if specific day-count conditions are met. This is a technical election with real tradeoffs and should not be made without understanding the consequences.

Closer Connection Exception

Even if you technically meet the SPT, you may be able to claim you’re still a nonresident alien by showing a closer connection to a foreign country (like India) — generally requires being present under 183 days in the current year and filing Form 8840. This does not apply to Green Card holders.

Tax Treaty Tie-Breaker Rules

If you’re considered a tax resident of both India and the US under each country’s domestic law, the India-US tax treaty contains “tie-breaker” rules to determine a single treaty residence — see TaxPremia’s explainer on the OECD vs UN Model Tax Convention for how treaty residency articles are generally structured.

⚠️ Common Mistakes to Avoid

• Assuming visa type alone determines residency (H-1B does not automatically mean resident; F-1 does not automatically mean nonresident)
• Forgetting to count partial days of arrival and departure correctly under IRS rules
• Not tracking prior-year day counts, which are required for the SPT calculation
• Missing the dual-status filing requirements in the year of transition
• Assuming the Closer Connection Exception applies without actually meeting its conditions or filing Form 8840

🇮🇳 What Changes for Indians Once You’re a Resident Alien

The moment you become a US resident alien — whether by Green Card or by meeting the SPT — your Indian financial life generally comes into scope for US reporting too:

• Interest from Indian savings accounts and fixed deposits becomes reportable US income
• Gains from Indian mutual funds and shares become reportable — see TaxPremia’s guide to NRI capital gains on Indian shares and mutual funds for how India taxes the same gain first
• Foreign account disclosure rules (FBAR/FATCA) may apply based on account balances
• DTAA and Foreign Tax Credit become relevant to avoid paying full tax twice — see TaxPremia’s guide on how NRIs can claim DTAA benefit using TRC and Form 10F

You’ll also want a Tax Residency Certificate (TRC) if you plan to claim treaty relief on either side — see TaxPremia’s guide on what a TRC is and how to obtain one.

❓ FAQs

🏁 Conclusion and What to Read Next

Your US tax residency status is the foundation everything else is built on — which form you file, whether your Indian income and accounts come into the picture, and which deductions you can claim. The Green Card Test is a simple yes/no. The Substantial Presence Test requires real arithmetic across three years — not a guess based on your visa category.

Related reading already live on TaxPremia:

• US Federal Income Tax Explained (2026 Guide)
• Tax Residency Certificate (TRC): Purpose & How to Obtain It
• How NRIs Can Claim DTAA Benefit in ITR — TRC + Form 10F Step by Step
• OECD Model vs UN Model Tax Treaty — Key Differences Explained
• NRI Shares aur Mutual Fund Capital Gain Tax in India

Coming soon in this series:

• FBAR / FATCA — thresholds, forms, and penalties for foreign account non-disclosure
• Form 1040-NR: A Complete Guide for F-1/J-1/H-1B Filers

Disclaimer

This article is for general education only. US tax residency rules depend on individual facts, visa history, and treaty position. TaxPremia is not a CPA firm and this is not official IRS advice. Confirm current 2026 rules on IRS.gov or consult a qualified US tax professional.