1, it can be supplemented. Social security payment refers to the interruption of social security payment for some reason, and it has not been paid in the middle months. But now, due to recruitment or other reasons, it is necessary to make up the part that has not been paid before, so as to obtain a complete social security period and ensure the normal identification of recruitment and settlement. Under normal circumstances, general units (regions) can only make up for 2 months. If it takes longer, it will have to be operated by some institutions. 2. It should be noted that the social security policy can be filled for two years at most, that is to say, it is calculated from the month of filling (calculated according to the time period of filling, not according to the cumulative month). For example, any time period from April 10 to April 2009 is considered as a year. For example, any time period from 10 April to March 2009 to April 2008 is counted as two years, and only September 2008 is paid separately. The payment of social security is the part that you will break after you start to apply for social security, and you can't pay it forward. 1, directly provide a copy of the monthly salary voucher, affix the financial seal and official seal, and the voucher must be signed by the employee himself. 2. A copy of the employee's labor contract. The unit plans to make a supplementary application, saying that it is due to the mistakes of the handling personnel and other reasons to supplement the insurance payment. The employee's name and ID number are indicated on it. Stamp with official seal. Take the official seal, go there and fill out Form 4 and Form 5, and the staff will generally tell you the payment ratio and multiply it according to the base. Table 5 cannot be modified, please note. Table 4 is in duplicate and Table 5 is in triplicate. Then choose the payment method, cash or check. In addition to these, you still need to bring the original and copy of your ID card.