Tax & Payroll

National Pension Estimator

Estimate your monthly old-age pension and start age from income and years.

Official basis · some exemptions excludedBased on 2026 rulesSources: National Pension Service · National Pension Act

Birth year

Contribution start year

Expected contribution period

You can enter up to 45 years.

Average monthly income (pre-tax)

원

Enter the average over your whole contribution period, in today's value.

Pension start timing

Estimated monthly pension

1,085,604원

Estimated annual pension13,027,248 원

Pension start age65yrs

Pension start year2055

Contribution-period factor×1.50

Monthly premium (your share)166,250 원

Est. total premiums paid59,850,000 원

20년 초과 10년 가입 → 50% 가산

This is a present-value (2026 A-value) simulation. Check your actual benefit via the National Pension Service website or its official mobile app.

What is the old-age pension?

The old-age pension is a monthly benefit for anyone who has contributed to National Pension for at least 10 years (120 months) once they reach the start age. Longer contribution periods, higher average income, and deferring the claim all increase the amount. This calculator is a reference simulation in present value (2026 A-value).

Calculation formula

Base pension (annualized) = Σ[yearly coefficient × (A-value + B-value)] ÷ contribution years, then multiplied by the contribution-period factor and divided by 12 for the monthly amount. For years contributed between 1988–1998, 0.75×B-value is used instead of B-value.

Yearly proportional constant (income replacement rate)
Contribution year	Coefficient	Replacement rate
1988–1998	2.4	70%
1999–2007	1.8	60%
2008	1.5	50%
2009–2025	Decreases 0.015/yr from 1.5	41.5% in 2025
2026 onward	1.29	43% (fixed)

Contribution-period factor f(n): for over 20 years, 1 + 0.05 × (n − 20) (+5% per extra year); for 10–19 years, 0.5 + 0.05 × (n − 10) (prorated reduction); under 10 years, not eligible.

Early/deferred adjustment: early claim reduces 6% per year (up to 5 years, max −30%); deferral adds 7.2% per year (up to 5 years, max +36%).

Pension start age by birth year

Old-age pension start age by birth year
Birth year	Start age
1952 or earlier	60
1953–1956	61
1957–1960	62
1961–1964	63
1965–1968	64
1969 or later	65

What are early and deferred claims?

An early claim lets a contributor with no income start up to 5 years before the standard age, at a 6% reduction per year. A deferred claim lets you start up to 5 years later, at a 7.2% bonus per year. The choice is permanent once made, so weigh it against life expectancy and other income.

Worked example (born 1990, started 2016, 30 years, 3.5M KRW/mo avg.)

Estimated monthly pension by timing
Timing	Start	Est. monthly pension
Standard	Age 65 (2055)	1,085,604 KRW
3 yrs early	Age 62 (2052)	890,195 KRW
2 yrs deferred	Age 67 (2057)	1,241,931 KRW

With the same inputs but only the minimum 10 years of contributions, the factor drops to 0.50 and the estimated monthly pension falls to about 366,051 KRW — the amount and the factor both grow together with a longer contribution period.

Simplified estimate. Assumes the same average income across the whole period and ignores yearly income-cap/floor and re-evaluation changes. Verify exact figures with the National Pension Service.

FAQ

How is the estimated national pension calculated?

For each contribution year, a proportional constant (based on that year's income-replacement rate) is multiplied by the sum of the national average income (A-value) and your average income (B-value), summed across all years, then divided by the contribution period. A 5% bonus per year is added over 20 years, and a proportional reduction applies for 10–19 years.

What average monthly income (B-value) should I enter?

The actual formula re-evaluates income for each contribution year to present value, but this calculator applies a single average monthly income across the whole period. Enter your rough average pre-tax monthly income (in today's value).

How much difference is there between early and deferred claims?

Claiming early lets you start up to 5 years before the standard age, reducing the amount by 6% per year (up to 30% at 5 years early). Deferring lets you start up to 5 years later, adding 7.2% per year (up to 36% at 5 years deferred).

What happens if I contributed for less than 10 years?

The old-age pension requires at least 10 years (120 months) of contributions. With less than 10 years, you instead qualify for a lump-sum refund of your contributions plus interest.

Why does this differ from the National Pension Service's official estimate?

This calculator assumes a single average income across the whole contribution period and does not reflect yearly income-cap/floor changes or re-evaluation rates. For an accurate estimate, check the National Pension Service website or its official app.

FAQ

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