Understanding Dual Contributions: Korean National Pension vs. U.S. FICA

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Understanding Dual Contributions: Korean National Pension vs. U.S. FICA Navigating social security systems across borders can be confusing—especially for employees working between Korea and the U.S. A recurring question is: Can someone pay into both Korea’s National Pension and U.S. FICA (Social Security and Medicare taxes) at the same time—and what happens if they do? This post breaks down how the Korea–U.S. Totalization Agreement works, what “coverage” means, and the consequences of dual contributions. 1. The Totalization Agreement at a Glance πŸ‡°πŸ‡·πŸ‡ΊπŸ‡Έ Since 2001, the Korea–U.S. Totalization Agreement has coordinated social security coverage between the two countries. Its primary goal is to: Prevent double taxation of social security contributions on the same income during the same time period Protect future benefit rights for cross-border workers Key principles: At any given time, only one country’s social security system applies to your wages C...

πŸ“Œ When You Can’t Deduct Both 401(k) and Traditional IRA Contributions

 Many people wonder:

πŸ’­ “Can I contribute to both a 401(k) and a Traditional IRA and get a tax break for both?”
Short answer: You can contribute to both—but you might not get a tax deduction for both.

Let’s break it down:

✅ You CAN contribute to both accounts in the same year.

That’s perfectly allowed under IRS rules. But...

⚠️ Whether your Traditional IRA contribution is tax-deductible depends on two things:

  1. Whether you (or your spouse) are covered by a workplace retirement plan like a 401(k)

  2. Your modified adjusted gross income (MAGI)


🧾 If You Are Covered by a 401(k)

Then your ability to deduct your Traditional IRA contribution depends on your income. For 2025, here are the deduction phase-out ranges if you’re covered by a workplace plan:

Filing StatusFull Deduction If MAGI ≤Partial DeductionNo Deduction If MAGI ≥
Single or Head of Household$77,000$77,000–$87,000      $87,000+
Married Filing Jointly (you’re covered)$123,000$123,000–$143,000     $143,000+
Married Filing Jointly (only spouse is covered)$230,000$230,000–$240,000     $240,000+

So, if you have a 401(k) and your income is too high, you won’t get a tax deduction for contributing to a Traditional IRA.


πŸ”„ If You Still Want to Contribute to an IRA

If your Traditional IRA isn’t deductible, you have two main options:

  1. Contribute anyway (nondeductible IRA): Still grows tax-deferred, but you'll need to track basis using Form 8606.

  2. Consider a Roth IRA instead: If your income is within the eligibility range, Roth IRAs grow tax-free and qualified withdrawals are tax-free too.


πŸ’‘ Summary

  • You can contribute to both a 401(k) and a Traditional IRA.

  • But if you (or your spouse) have a 401(k) and your income is high, you may lose the IRA deduction.

  • Know your income level and check the phase-out ranges before deciding where to put your money.

πŸ’­ 401(k)와 IRA λ‘˜ λ‹€ λΆˆμž…ν•˜λ©΄ μ„ΈκΈˆ ν˜œνƒλ„ 두 배일까?

μš”μ¦˜ 은퇴 쀀비에 관심 λ§Žμ€ 뢄듀이 자주 λ¬»λŠ” 질문 쀑 ν•˜λ‚˜κ°€ μžˆμ–΄μš”.

401(k)λž‘ Traditional IRA, λ‘˜ λ‹€ λΆˆμž…ν•˜λ©΄ μ„ΈκΈˆ ν˜œνƒλ„ λ‘˜ λ‹€ 받을 수 μžˆλ‚˜μš”?

κ²°λ‘ λΆ€ν„° λ§ν•˜μžλ©΄ —
λ‘˜ λ‹€ λΆˆμž…μ€ κ°€λŠ₯ν•˜μ§€λ§Œ, μ„ΈκΈˆ κ³΅μ œλŠ” κΌ­ λ‘˜ λ‹€ λ˜λŠ” 건 μ•„λ‹™λ‹ˆλ‹€.

ν—·κ°ˆλ¦΄ 수 μžˆλŠ” λΆ€λΆ„μ΄λ‹ˆ ν•˜λ‚˜μ”© 천천히 ν’€μ–΄λ³Όκ²Œμš”!


✅ λ‘˜ λ‹€ λΆˆμž…ν•˜λŠ” 건 μ™„μ „ OK!

μš°μ„ , **401(k)와 전톡적인 IRA(Traditional IRA)**λŠ”
같은 해에 λ™μ‹œμ— λΆˆμž…ν•˜λŠ” 게 μ „ν˜€ 문제 μ—†μŠ΅λ‹ˆλ‹€.

λ―Έκ΅­ κ΅­μ„Έμ²­(IRS)도 이λ₯Ό λͺ…ν™•νžˆ ν—ˆμš©ν•˜κ³  μžˆμ–΄μš”.
ν•˜μ§€λ§Œ! 핡심은 μ„ΈκΈˆ 곡제 μ—¬λΆ€μ£ .


⚠️ IRA μ„ΈκΈˆ κ³΅μ œκ°€ λ˜λŠ”μ§€λŠ” ‘두 κ°€μ§€’κ°€ κ΄€κ±΄μ΄μ—μš”

  1. λ‹Ήμ‹ (λ˜λŠ” 배우자)이 401(k) 같은 직μž₯ ν‡΄μ§μ—°κΈˆμ— κ°€μž…λ˜μ–΄ μžˆλŠ”κ°€?

  2. μ‘°μ • ν›„ μ΄μ†Œλ“(MAGI, Modified Adjusted Gross Income) μˆ˜μ€€μ΄ μ–Όλ§ˆμΈκ°€?

이 두 가지에 따라 Traditional IRA λΆˆμž…κΈˆμ΄ μ„ΈκΈˆ 곡제 λŒ€μƒμΈμ§€ μ•„λ‹Œμ§€κ°€ κ²°μ •λΌμš”.


🧾 401(k)에 κ°€μž…λœ 경우라면?

μ΄μ œλΆ€ν„°λŠ” 쑰금 더 ꡬ체적인 μˆ«μžκ°€ λ‚˜μ˜΅λ‹ˆλ‹€!

2025λ…„ κΈ°μ€€, 401(k) 같은 직μž₯ ν‡΄μ§μ—°κΈˆμ— κ°€μž…λ˜μ–΄ μžˆλŠ” μ‚¬λžŒμ€
μ†Œλ“μ΄ 일정 μˆ˜μ€€ 이상이면 전톡 IRA에 λΆˆμž…ν•˜λ”λΌλ„ 곡제λ₯Ό λͺ» λ°›μ•„μš”.

μ •ν™•ν•œ 기쀀은 μ΄λ ‡μŠ΅λ‹ˆλ‹€:

μ‹ κ³  μœ ν˜•μ „μ•‘ 곡제 κ°€λŠ₯ (MAGI κΈ°μ€€)일뢀 곡제 κ°€λŠ₯곡제 λΆˆκ°€
독신 λ˜λŠ” μ„ΈλŒ€μ£Ό$77,000 μ΄ν•˜$77,000–$87,000$87,000 이상
λΆ€λΆ€ 곡동 μ‹ κ³  (본인이 κ°€μž…μž)$123,000 μ΄ν•˜$123,000–$143,000$143,000 이상
λΆ€λΆ€ 곡동 μ‹ κ³  (배우자만 κ°€μž…μž)$230,000 μ΄ν•˜$230,000–$240,000$240,000 이상

예λ₯Ό λ“€μ–΄, λΆ€λΆ€κ°€ 곡동 μ‹ κ³ λ₯Ό ν•˜κ³  λ‘˜ λ‹€ 401(k)에 κ°€μž…λ˜μ–΄ μžˆλŠ”λ°, μ—° μ†Œλ“μ΄ $150,000이라면?
→ Traditional IRA에 λΆˆμž…μ€ κ°€λŠ₯ν•˜μ§€λ§Œ, μ„ΈκΈˆ κ³΅μ œλŠ” μ•ˆ λ©λ‹ˆλ‹€.


πŸ”„ κ·Έλž˜λ„ IRA에 λΆˆμž…ν•˜κ³  μ‹Άλ‹€λ©΄?

κ³΅μ œκ°€ μ•ˆ λœλ‹€κ³  무쑰건 포기할 ν•„μš”λŠ” μ—†μ–΄μš”. 이런 선택지도 μžˆμŠ΅λ‹ˆλ‹€:

곡제 없이 Traditional IRA에 λΆˆμž…ν•˜κΈ° (Nondeductible IRA)

μ„ΈκΈˆ κ³΅μ œλŠ” μ•ˆ λ˜μ§€λ§Œ, κ³„μ’Œ λ‚΄μ—μ„œ μ„ΈκΈˆ 유예 μ„±μž₯은 κ·ΈλŒ€λ‘œμž…λ‹ˆλ‹€.
단, μ„ΈκΈˆ 계산을 μœ„ν•΄ Form 8606으둜 μ›κΈˆ 기쀀을 좔적해야 ν•΄μš”.

Roth IRA둜 λ°©ν–₯ ν‹€κΈ°

Roth IRAλŠ” λΆˆμž… μ‹œμ—λŠ” μ„ΈκΈˆ κ³΅μ œκ°€ μ—†μ§€λ§Œ,
μ†Œλ“ κΈ°μ€€λ§Œ λ§žλŠ”λ‹€λ©΄ 투자 μˆ˜μ΅μ— λŒ€ν•΄ μ„ΈκΈˆ 없이 μΈμΆœν•  수 μžˆλŠ” μ•„μ£Ό λ§€λ ₯적인 μ˜΅μ…˜μ΄μ—μš”.


πŸ’‘ 마무리 정리

  • 401(k)와 Traditional IRA, λ‘˜ λ‹€ λΆˆμž…ν•  수 μžˆμ–΄μš”.

  • ν•˜μ§€λ§Œ μ†Œλ“μ΄ λ†’κ±°λ‚˜ 직μž₯μ—μ„œ ν‡΄μ§μ—°κΈˆμ— κ°€μž…λ˜μ–΄ μžˆλ‹€λ©΄,
    IRA λΆˆμž…μ•‘μ— λŒ€ν•œ μ„ΈκΈˆ 곡제λ₯Ό λͺ» 받을 수 μžˆμ–΄μš”.

  • κ²°κ΅­ μ€‘μš”ν•œ 건 μžμ‹ μ˜ μ†Œλ“ μˆ˜μ€€κ³Ό 곡제 기쀀을 μ •ν™•νžˆ νŒŒμ•…ν•˜λŠ” 것!

은퇴 μ€€λΉ„λŠ” μž₯κΈ°μ „μ΄μ—μš”.
μž‘μ€ 차이가 λ‚˜μ€‘μ—” 큰 차이λ₯Ό λ§Œλ“€ 수 μžˆμœΌλ‹ˆ,
λ§€λ…„ μ†Œλ“ 기쀀을 κΌ­ μ²΄ν¬ν•˜κ³  μ „λž΅μ μœΌλ‘œ μ›€μ§μ΄μ„Έμš”! πŸš€


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