In the US, the public retirement benefit is Social Security — based on the taxes (FICA) you paid while working, it pays a monthly benefit for life. The biggest decision is "when to start claiming." Claim early at 62 and it's permanently smaller; wait until 70 and it's much larger. If you also worked in Korea, check the US-Korea totalization agreement. Here are the essentials.
Eligibility: 40 credits (about 10 years)
To qualify, you need 40 work credits — roughly 10 years of covered work (paying FICA). Short on credits? If you worked in Korea, the US-Korea totalization agreement lets you combine coverage from both countries (see below).
The key call: when to start (62 vs 67 vs 70)
For those born in 1960 or later, full retirement age (FRA) is 67 — claim then and you get 100% (your base amount). Earlier or later changes the amount for life.
| Start age | Monthly benefit (67 = 100%) | Note |
|---|---|---|
| 62 (earliest) | about 70% (~30% reduction) | Sooner, but less for life |
| 67 (FRA) | 100% | Base amount |
| 70 (max) | about 124% (+24%) | +8%/year for delaying; 70 is the cap |
So 62 vs 70 is roughly a 1.8× difference in monthly benefit. Delaying past 70 doesn't increase it further.
Early vs late — how to decide
It depends on how long you'll live and whether you need income now.
| If... | Consider |
|---|---|
| Poor health or urgent income need | Claiming early (62) |
| Healthy, likely longevity, other income | Delaying (70) for a bigger check |
| Still working (high income before FRA) | Delay (early claiming has an earnings reduction) |
| Considering spousal/survivor benefits | Higher earner delays to grow survivor benefit |
The break-even is usually around age 78–83. Expect to live longer than that, and delaying wins on total dollars. Taxes, investment returns, and inflation adjustments add nuance — set the big principle and apply your situation.
The US-Korea totalization agreement
The US and Korea have a social security agreement giving two benefits to people who worked in both:
- Combining coverage: if your US credits fall short of 40 (10 years), Korean national pension periods can be counted to meet minimum eligibility.
- No double taxation: for postings, it prevents paying social security tax to both countries.
Note: combining is for eligibility; each country pays based on its own coverage. You may receive both Korea's national pension and US Social Security separately. Confirm the exact amounts with both agencies.
Example: 12 years in the US, 15 in Korea
Say you worked 12 years in the US (48 credits) and 15 in Korea. ① The US side is past 40 credits → Social Security eligible. ② Korea's national pension with 15 years also qualifies (10+ years). ③ So you can receive a pension from each country. ④ Had your US work been only 8 years (short), the agreement could combine Korean periods to meet US minimum eligibility. Plan it alongside your 401(k) and IRA.
Points to know
- ☐ Benefits are adjusted yearly for inflation (COLA)
- ☐ Social Security can be partly taxable depending on income
- ☐ Spousal/survivor benefits exist — couples should strategize
- ☐ Check your estimated benefit at my Social Security (ssa.gov)
- ☐ With Korean work history, gather totalization paperwork
- ☐ Design "three-layer" retirement with 401(k) and IRA
FAQ
Q. Only for green card holders or citizens?
If you worked legally and earned credits, green card holders qualify too. If you move abroad, payment rules vary by citizenship and country — check with SSA. Korea, as an agreement country, is relatively favorable.
Q. What if I claim at 62 and keep working?
Claiming before FRA (67) while earning above a threshold triggers a temporary reduction (adjusted back later). If you'll keep working, delaying is usually better.
Q. Is Social Security enough for retirement?
It's a safety net, not your whole retirement income — it replaces roughly 40% of pre-retirement income. Fill the rest with a 401(k) and IRA.
Q. Does receiving Korea's pension reduce Social Security?
Rules like the former WEP were contentious, and agreements/laws have changed, so it varies. If you'll receive both, verify current rules with SSA and Korea's pension service.
The core of Social Security is "when to start." Claim at 62 for ~30% less, or at 70 for ~24% more. Decide by health, longevity, and other income — and if you worked in Korea, use the totalization agreement.
This is general information based on 2026 rules, not tax or pension advice. Amounts and rules depend on your history and policy changes — verify with the US SSA (ssa.gov) and Korea's National Pension Service.
