What does it cost to pay Korea’s National Pension contribution late? The deadline is the 10th of the following month. After it, a late charge of 1/1,500 a day accrues and pauses at 2%. Once 30 days have passed, a further 1/6,000 a day is added, up to a final cap of 5%. We read Articles 89 and 97 of the National Pension Act in the original and worked out the days.
1. Due by the 10th of the next month. The person liable must pay by the 10th of the following month (Article 89(1)).
2. First 30 days: 1/1,500 a day, capped at 2%. It may not exceed 20/1000 of the overdue contribution (Article 97(1)).
3. After that: 1/6,000 a day, final cap 5%. It may not exceed 50/1000 of the overdue contribution (Article 97(2)).
The deadline — Article 89
- Rule — by the 10th of the following month ((1)). September’s contribution is due 10 October (our example).
- Farmers and fishers — on their own application, may pay quarterly by the 10th of the month after the quarter (proviso to (1)).
- Paying in advance — the period and the reduction are set by Presidential Decree ((3)).
- Automatic transfer — paying by account or credit-card automatic transfer may bring a reduction or other benefit as prescribed by Decree ((4)).
- Extension — for reasons set by Ministry ordinance, such as late delivery of the notice, the National Health Insurance Service may extend the deadline within 1 month, on application ((5) and (6)).
The National Health Insurance Service is the subject of these provisions because it collects the four social insurance premiums (general background, not from these provisions). The amounts of the advance-payment and automatic-transfer reductions are in the Decree, which we did not read this time.
The late charge — Article 97
| Period | Added each day (statute) | Cap (statute) |
|---|---|---|
| From the day the deadline passes | 1/1,500 of the overdue contribution | 20/1000 of the overdue contribution |
| From the day 30 days have passed after the deadline | A further 1/6,000 | 50/1000 of the overdue contribution |
The charge may be waived for natural disaster or other unavoidable reasons prescribed by Presidential Decree ((3)).
In days — our arithmetic
| Days late | Late charge rate | On 200,000 won overdue |
|---|---|---|
| 1 day | About 0.067% | About 133 won |
| 15 days | 1% | 2,000 won |
| 30 days | 2% (first cap) | 4,000 won |
| 120 days | 3.5% | 7,000 won |
| 210 days | 5% (final cap) | 10,000 won |
30 ÷ 1,500 = 2%, so the first stage reaches its cap at exactly 30 days; the remaining 3% takes 3% × 6,000 = 180 days, 210 in all. Nothing accrues after that. Which day counts as the first and how odd won are rounded cannot be settled from the text alone, so treat this as approximate. The 200,000 won is our example.
What costs more than the late charge
The charge stops at 5%, but an unpaid period is meanwhile not counted as insured time (our reading — we did not read the detailed rules on calculating the insured period this time). If you cannot pay, rather than leaving it overdue you can check whether a ground applies and apply for the contribution exemption, and restore the period later by back payment.
Checklist
- ☐ Check the balance before the 10th each month (or the debit date for automatic transfer)
- ☐ If the notice arrived late, apply for an extension (within 1 month)
- ☐ If overdue, pay within 30 days — it still accrues afterwards, at a quarter of the pace
- ☐ If you cannot pay, check the exemption grounds
Questions that remain
Do employees pay the late charge?
The text says it is collected when “the person liable to pay” does not pay. Who is liable for a workplace-based insured person’s contributions is in Article 90 and elsewhere, which we did not read this time.
Does less accrue after 30 days?
The daily pace slows from 1/1,500 to 1/6,000, but the total keeps rising to 5%. It is “more, slowly”, not “less” (our wording).
Sources
- National Pension Act [Act No. 21203, partially amended 16 December 2025] — original text (checked 2 October 2026). Article 89(1) (the 10th of the following month; quarterly payment for farmers and fishers), (3) and (4) (advance and automatic-transfer reductions), (5) and (6) (extension within 1 month); Article 97(1) (1/1,500; 20/1000), (2) (30 days; 1/6,000; 50/1000) and (3).
- Not read. The Decree’s reduction amounts, the Ministry ordinance on extension reasons, Article 90 (payment by withholding), and the detailed insured-period rules.
- Our own working. The rates at 15, 30, 120 and 210 days and the amounts in the 200,000 won example are ours.
Where to check further
- The scheme as a whole — National Pension basics.
- Your own arrears and late charge — the National Pension Service (1355 in Korea) or the National Health Insurance Service (1577-1000 in Korea) can confirm them.
Written on 2 October 2026. The provisions are as published by the Korea Law Information Center; the day counts and amounts are ours.
