Tax Implications of Getting a Green Card — What Changes?
영주권 취득의 세금 영향 — 정확한 규정 2026
The payment-date rule for severance (not a service-period proration), how 국민연금 distributions are actually taxed by Korea, and the verified 8-of-15-year Long-Term Resident counting rule for exit tax exposure.
Overview — Green Card Is a Tax Residency Event 영주권은 세금 거주자 지위 발생 사건
Obtaining a U.S. green card triggers U.S. tax residency under the Internal Revenue Code, independent of immigration intent or physical presence. A green card holder is taxed on worldwide income from the residency start date forward — even if they continue living in Korea, have no U.S. income, and have never set foot in the United States after the green card was issued abroad.
| Fact | Changes U.S. Tax Residency? |
|---|---|
| Still living in Korea after receiving the green card | NO — U.S. tax residency is not based on physical presence for green card holders |
| No U.S. income | NO — worldwide income reporting still applies |
| No U.S. bank account | NO — U.S. tax residency is a status, not contingent on having U.S. financial ties |
| Never physically entered the U.S. after green card approval | NO for tax residency status itself — though the specific residency START DATE rule differs depending on whether the green card was received abroad or while in the U.S. (Section 2) |
Residency Start Date — IRC §7701(b) 거주자 시작일 — IRC §7701(b)
- Green card approved while physically present in the U.S.: the residency start date is the date of approval — since the person was already in the U.S. when status changed.
- Green card approved while abroad: the residency start date is the first day of physical presence in the U.S. after the green card was approved — not the approval date itself.
- Example: green card approved abroad on March 10; first U.S. entry as a green card holder on April 2 → residency start date is April 2, not March 10.
- This date determines: which income is taxable (only income earned/received on or after this date), how severance and stock gains are split between taxable and non-taxable periods, and the starting point for the 8-of-15-year exit tax counting rule (Section 7).
Dual Residency and the Treaty Tie-Breaker 이중거주자와 조약 타이브레이커
A green card holder who continues living in Korea may simultaneously be a U.S. tax resident under U.S. domestic law and a Korean tax resident under Korean domestic law. The U.S.–Korea Tax Treaty's tie-breaker provision (Article 3(2)) resolves which country has primary treaty residency, applying factors in sequence: permanent home, center of vital interests, habitual abode, and nationality.
Worldwide Asset Reporting Begins 전세계 자산 신고 의무 시작
| Form | Trigger |
|---|---|
| FBAR (FinCEN 114) | Aggregate foreign financial accounts exceed $10,000 at any point during the year |
| FATCA (Form 8938) | Specified foreign financial assets exceed filing-status-specific thresholds ($50K/$75K single domestic; higher if residing abroad) |
| Form 5471 | 10%+ ownership of a Korean corporation (법인) |
| Form 8865 | Interest in a foreign partnership meeting ownership/contribution thresholds |
| Form 3520/3520-A | Foreign trust interests, or gifts/inheritances from foreign persons exceeding threshold |
| Form 8621 | Ownership of Korean ETFs, mutual funds, or other PFICs |
Korean Severance — Payment Date Controls, Not Service-Period Proration 한국 퇴직금 — 지급일 기준, 근무기간 비례배분 아님
- Entirely Korean-source income of a non-resident alien
- NOT taxable in the U.S. — regardless of how many years of service it represents
- No U.S. reporting required for this payment
- Fully taxable in the U.S. as worldwide income — the ENTIRE payment, not a prorated portion
- True even if 9 of 10 years of underlying service occurred before residency began
- Korean severance tax withheld (퇴직소득세) is creditable via Form 1116, general basket
국민연금 — How It's Actually Taxed 국민연금 — 실제 과세 방식
국민연금 (National Pension) old-age benefits attributable to contributions made after January 1, 2002 are taxed by Korea as 연금소득 (pension income) when received — under Korean Income Tax Act §20-3 and §22. This is because contributors received a Korean income tax deduction on those contributions when paid in, under Korea's "EET" (Exempt-Exempt-Taxed) pension structure, similar in concept to a U.S. 401(k) or traditional IRA. Only the portion of benefits attributable to pre-2002 contributions remains untaxed at distribution.
- 국민연금 is subject to mandatory comprehensive taxation (종합과세) in Korea — unlike private pension products, it cannot elect the simplified 15% separate taxation available to 연금저축/IRP distributions.
- Korean tax withheld on 국민연금 distributions may generate a Foreign Tax Credit on the U.S. return — this should be checked against the recipient's actual annual pension statement (which shows the taxable vs. non-taxable portion based on contribution history) rather than assumed unavailable.
- U.S. treatment of the distribution itself requires separate analysis — whether it is characterized analogously to Social Security under treaty principles or as ordinary foreign pension income affects the specific reporting mechanics, though either way the Korean tax actually paid remains a potential FTC input if Korean tax was, in fact, withheld.
Exit Tax Risk — The 8-of-15-Year Rule, Precisely 출국세 위험 — 8/15년 규정 정확히
A green card holder becomes a "Long-Term Resident" (LTR) — and therefore potentially subject to exit tax under IRC §877A upon giving up the green card — if they held the green card in at least 8 of the last 15 tax years ending with the year residency terminates.
The Counting Rule
- Based on tax years (calendar years for most individuals), not a 365-day count. Holding the green card for even a single day during a calendar year counts that entire year toward the 8-year total.
- The 8 years do not need to be consecutive.
- The first and last years both count under this "any part of the year" rule — a green card obtained March 1 counts that year; a green card abandoned February 1 of a later year still counts that year too.
- Years where the green card holder validly claimed treaty non-resident status (Form 8833) and did not waive treaty benefits do NOT count toward the 8-year total — but this strategy must be used contemporaneously, before LTR status is reached. Using Form 8833 after already becoming an LTR is itself treated as the expatriating act.
Illustrative: green card obtained late 2018, abandoned early 2026 — 9 calendar years touched (2018–2026), each counting fully toward the 8-of-15 threshold despite both endpoint years being partial.
Covered Expatriate Status — Separate from LTR Status
| Test (any ONE triggers covered expatriate status) | 2025/2026 Threshold |
|---|---|
| Average annual net income tax, 5 years before expatriation | Exceeds $206,000 (2025; indexed annually for 2026) |
| Net worth on the expatriation date | $2,000,000 or more (any currency, worldwide assets) |
| Certification failure | Failing to certify 5 years of full U.S. tax compliance on Form 8854 — this alone triggers covered expatriate status regardless of income or net worth |
Step-by-Step Guidance 단계별 절차
Based on whether the green card was approved abroad or while already in the U.S. — this single date governs nearly everything else.
Salary, rental, business, dividends, stock gains, severance, pension distributions.
Bank accounts, brokerage accounts, real estate, corporate ownership, trust interests.
FBAR, FATCA, PFIC (Form 8621), Form 5471, Form 8865, Form 3520 as applicable.
To prevent double taxation on Korean income that Korea also taxes.
The payment/transaction date relative to the residency start date — not a service-period proration — determines taxability.
Especially relevant for anyone who may eventually give up the green card — early awareness preserves planning options.
5 Fully Computed Examples 실제 계산 사례 5개
| Green card approved abroad: March 10; first U.S. entry: April 2 → residency start date | April 2 |
| Korean salary, April–December: fully taxable | Reported on Form 1040, FTC available for Korean tax withheld |
| Korean salary, January–March (pre-residency): not taxable | Non-resident alien period |
10 years of Korean service. Green card obtained (residency start date) at the beginning of year 9. Severance (퇴직금) for the full 10 years: KRW 70,000,000.
| Scenario A: severance paid in year 8 (before residency start) | $0 U.S. tax on the full KRW 70,000,000 — entirely Korean-source, non-resident period, regardless of the 10-year service history |
| Scenario B: severance paid in year 9 or later (after residency start) | The ENTIRE KRW 70,000,000 is U.S.-taxable — not 1/10th. Korean severance tax withheld is creditable via FTC, general basket. |
There is no "1 year taxable, 9 years non-taxable" proration based on the service period. The entire payment is taxed as a single item based on which side of the residency start date the payment date falls on.
| 국민연금 노령연금 received: KRW 18,000,000/year, post-2002 contributions | Taxed by Korea as 연금소득; Korean tax withheld per the annual pension statement (e.g., KRW 900,000) |
| U.S. side: report the distribution as worldwide income (characterization analysis needed) | $13,139 (18M ÷ 1,370) reportable, subject to further characterization |
| FTC potentially available for the Korean tax actually withheld | Should be checked against the pension statement, not assumed unavailable |
| Green card holder owns 100% of a Korean 주식회사, formed years before the green card | Form 5471 + Form 8992 (GILTI/NCTI) required starting with the first tax year of U.S. residency — no grace period |
Green card obtained late 2018. Held continuously (no treaty non-resident election made in any year) through 2026, when the holder decides to abandon it to return to Korea permanently.
| Calendar years touched: 2018 (partial), 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 (partial) | 9 years — each counts fully under the "any part of year" rule |
| 9 ≥ 8 → Long-Term Resident status confirmed | Exit tax analysis (covered expatriate tests) now required before abandoning the green card |
This holder may not have been tracking LTR status at all — the count happens automatically based on calendar years touched, not a deliberate decision point the holder is necessarily aware of in real time.
Common Mistakes 자주 발생하는 오류
- 1 Prorating Korean severance across the years of underlying service. Severance is taxed entirely based on the payment date relative to the residency start date — it is not split proportionally between pre- and post-residency service years.
- 2 Assuming Korea doesn't tax 국민연금 distributions, so no FTC analysis is needed. Post-2002 contribution-derived 국민연금 benefits are taxed by Korea as 연금소득 — the actual Korean withholding shown on the pension statement should be checked before concluding no FTC is available.
- 3 Treating the 8-of-15-year LTR count as requiring 8 full calendar years. Holding the green card for even one day in a calendar year counts that entire year — partial years at the start and end of green card status both count fully.
- 4 Filing Form 8833 to claim treaty non-resident status after already reaching LTR status. This is itself treated as an expatriating act and can trigger the very exit tax consequences the filer may have been trying to avoid — this strategy only works if used contemporaneously, before reaching 8 years.
- 5 Assuming a green card holder with modest income and net worth has no exit tax exposure. The certification test (5 years of full U.S. tax compliance, including all information returns) triggers covered expatriate status by itself — a single missed Form 5471 or Form 8621 in the prior 5 years can result in covered expatriate status regardless of income or net worth.
- 6 Not filing Form 5471 immediately upon becoming a U.S. tax resident if already owning a Korean corporation. There is no grace period — the filing requirement (and GILTI/NCTI exposure if the corporation is a CFC) begins with the first tax year of residency.
- 7 Not tracking the residency start date precisely based on whether the green card was approved abroad or domestically. These two scenarios have different start-date rules, and using the wrong one misallocates income between taxable and non-taxable periods.
- 8 Believing Korean 1세대1주택 (one-house) exemption status carries over to eliminate U.S. capital gains tax on a later property sale. Korea's exemption has no U.S. equivalent; the U.S. capital gain remains fully taxable absent the separate, narrower IRC §121 exclusion meeting its own specific requirements.
Hanmi CPA Insight
The severance timing rule is the clearest illustration of how a single date — not a proportional calculation — can determine tens of thousands of dollars in U.S. tax outcome. A Korean professional with 15 years of service who receives a single lump-sum 퇴직금 payment faces either $0 U.S. tax or full U.S. taxation on the entire amount, depending solely on which side of the residency start date the payment falls on. There is no middle ground based on how many of those 15 years were served before versus after the move. For anyone with substantial accumulated Korean severance anticipating a move to the U.S., coordinating the payment date with the Korean employer's HR department — ideally completing the payment before the first U.S. entry as a green card holder — is one of the highest-value, lowest-effort planning actions available.
The LTR counting rule deserves attention precisely because it operates automatically and silently. A green card holder is not prompted at year 8 to make a decision — the calendar years simply accumulate, and by the time the holder considers giving up the green card, LTR status (and the associated exit tax exposure) may already be locked in without the holder having tracked it. Anyone who has held a green card for several years and might conceivably return to Korea permanently in the future should know their current year-count today, not discover it only when actually filing Form 8854.
The 국민연금 treatment matters for the same reason it matters in the broader Korean pension context: defaulting to "Korea doesn't tax it, so there's no FTC" closes off a credit that may, in fact, be available. Long-term green card holders who spent careers contributing to 국민연금 before relocating to the U.S. — or who continue receiving 국민연금 benefits while living in the U.S. — should have their actual Korean pension statements reviewed for withholding before assuming the distribution generates no Foreign Tax Credit.