Short answer
The “2 years,” “about 2 years and 1 month,” and “10 years” often mentioned in National Pension refer to different systems.
Paying an ordinary unpaid premium later: generally 2 years
Once 2 years have passed from the payment deadline, an ordinary National Pension premium is generally barred by the statute of limitations and can no longer be paid normally.
Applying retroactively for exemption or student special: roughly 2 years and 1 month
Exemption/deferment and the student payment special system can generally be applied for retroactively to about 2 years and 1 month before the application month. Older months reach their deadline one by one.
10-year additional payment: only for approved periods
Periods already approved for exemption, payment deferment, or the student special system can generally be paid later within 10 years. This does not mean an ordinary unpaid period with no application can always be paid within 10 years.
What to check
Your options depend on whether your record says “unpaid,” “full exemption,” “payment deferment,” or “student special.”

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