What should I do if I missed a month's payment of social security and provident fund after joining the company?

Both EPF and social security can be paid back.

Replacement of housing provident fund:

I. Replacement business handled directly by bank branches 1. Replacement contribution by the unit for all employees 1) Replacement contribution after normal remittance. Units for one month or several months of the overall arrears of supplementary contribution business, you need to fill out the "housing fund remittance (supplementary) contribution book", "housing fund supplementary contribution register. (2) Replacement contribution before the first remittance. Units for the establishment of the first remittance before the housing fund contributions, and remittance period of six months (including six months), you need to fill out the "housing fund remittance (remittance)," "housing fund remittance register," and provide the unit "copy of the business license" or the establishment of the unit's approval documents. The above retroactive contributions will be processed by the bank branch as "unit retroactive contributions" and the month of the retroactive contribution will be indicated in the Remarks column of the computer system. 2、Unit for individual employees to make up individual contributions within 6 months (including 6 months) or individual one-time contributions within 10,000 yuan (including 10,000 yuan), according to the following business processes. (1) Omitted to make up contributions. Units to fill out the "housing fund remittance (make-up)", "housing fund to make up for the Register", and to provide the month corresponding to the retroactive payment of the employment contract, personnel transfer notification form or the original wage payment form and a copy of each. (2) Replacement of underpayment. Employees who have already remitted housing fund contributions for the corresponding month will not be required to make individual retroactive contributions in principle. If it is necessary to make supplementary contributions due to calculation errors, etc., a list of the employee's wages and an explanation of the unit's supplementary contributions should be provided. B. Replacement Contributions to be Approved by the Housing Provident Fund Management Agency 1. Replacement Contributions by Units for All Employees Units making replacement contributions to the Housing Provident Fund from the time of establishment until the first remittance and for a period of more than 6 months (excluding 6 months) are required to fill in the "Housing Provident Fund Remittance (Replacement) Contribution", "Housing Provident Fund Replacement Contribution Inventory", and to provide the unit with "a copy of the Business License" or the approval document of the establishment of the unit, and notify the bank's acceptance network after approval of the Housing Provident Fund Management Agency. The management organization will notify the bank to handle the retroactive contribution after approval. 2. If the unit makes supplementary contributions for individual employees and the months of supplementary contributions exceed 6 months (excluding 6 months) or the amount of one-time supplementary contributions by individuals exceeds RMB 10,000 (excluding RMB 10,000), the unit should provide the list of wages of the employees, the description of supplementary contributions, and the "Housing Provident Fund Supplementary Contribution Inventory" and the "Summary of Approved Supplementary Contributions for Individuals to Housing Provident Fund" (attached), and then notify the bank to process the supplementary contributions after the approval of the housing provident fund management organization. Handling of retroactive contributions. Third, the approval process is directly handled by the bank outlets to make up for the payment of business, the staff should be strictly in accordance with the business process. The housing provident fund management organization is approved by the management body of the functional section responsible for acceptance. Approval procedures are: the section of the first review of the operator, the head of the section review, reported to the director in charge of the approval before processing.