The premium for National Pension Insurance is calculated on a bi-monthly basis. The Bureau of Labor Insurance will send the premium payment slips for the preceding two months at the end of the following month, to the registered household address or mailing address of the insured. The insured should pay the premium before the end of the month following the next month (i.e., the end of the month following the month when the premium payment slips are delivered) via the interbank fund transfer system or with cash payments via designated financial institutions, post offices or convenience stores by presenting the relevant premium payment slips. For premium payments of January and February, 2023, for example, the Bureau of Labor Insurance will send the payment slips to the insured before the end of March, 2023, and the insured is obliged to make the payment before the end of April, 2023.