National Pension Calculator
Last updated: 2026-06-25
Your National Pension benefit grows with longer contribution years and higher average income, and you must contribute for at least 10 years (120 months) to receive a monthly old-age pension.
This calculator estimates your monthly benefit by combining an income replacement rate proportional to your years of coverage (about 40% at 40 years) with your income and the average income of all members. It is a reference estimate; confirm the exact figure with the National Pension Service.
Enter your coverage details
Estimated monthly benefit
0 KRW
| Item | Value |
|---|---|
| Contribution years | |
| Applied replacement rate | |
| Estimated monthly benefit | |
| Annualized amount |
This result is a reference estimate using a replacement rate proportional to your years of coverage and differs from the actual benefit. For an exact projection, check 'My Pension' at the National Pension Service.
How to use it
- Enter contribution years — the total years you have contributed (or expect to contribute) to the National Pension.
- Enter average monthly income — your average monthly income (standard monthly income) over the contribution period, in KRW.
- View the result — press Calculate to see your monthly benefit, the annualized amount and the applied replacement rate in a table.
How your National Pension benefit is determined
The National Pension old-age benefit is driven mainly by two factors. First is your contribution period: the longer it is, the larger the benefit, and you need at least 10 years (120 months) to receive a monthly pension. Second is your income level: both your average covered income and the average income of all members (the A value) are reflected. Because the National Pension redistributes income, lower earners get a higher return relative to the contributions they paid.
| Contribution period | Approx. replacement rate | Note |
|---|---|---|
| 10 years | about 10% | Meets the minimum eligibility |
| 20 years | about 20% | — |
| 30 years | about 30% | — |
| 40 years | about 40% | Nominal replacement rate |
The real formula is more complex. It revalues your lifetime income to present value, applies a year-specific proportionality constant and adds dependent allowances. After you start receiving the pension, it is also raised each year by inflation. This calculator is a simplified way to gauge the rough scale, so treat it as an estimate only. Plan your full retirement alongside the Retirement Fund Calculator.
Frequently asked questions (FAQ)
What is the minimum number of years to receive the National Pension?
To receive a monthly old-age pension, your contribution period must be at least 10 years (120 months). With less than 10 years, you instead receive a lump-sum refund of your contributions plus interest. This calculator shows a monthly benefit of 0 when the period is under 10 years.
Is this calculator's estimated benefit accurate?
No. This tool is a reference estimate that simply combines an income replacement rate proportional to your years of coverage with your income and the average income of all members (the A value). The actual pension is computed with a complex formula reflecting revalued lifetime income, inflation adjustments and dependent allowances. For an exact figure, check 'My Pension' on the National Pension Service site.
What is the income replacement rate?
The income replacement rate is the share of your average covered income that the pension replaces. For new members as of 2025, the nominal replacement rate is about 40% for 40 years of coverage, and it scales down proportionally for shorter periods. For example, 20 years is about 20%.
From what age is the old-age pension paid?
It depends on your birth year. People born in or after 1969 receive it from age 65 (those born 1953–1968 are phased between 61 and 64). Early old-age pension can start up to 5 years earlier, but it is reduced by about 6% per year.
Related calculators & guides
Retirement Fund Calculator
Estimate the retirement fund you need from expenses and years.
Pension Savings Tax Credit Calculator
Calculate the tax credit and refund on your pension savings.
Retirement Simulator
Simulate at what age your assets run out.
National Pension & Pension Savings Basics
An intro guide to the Korean pension system in one place.
Last updated: 2026-06-25