2012年1月时可以要求补缴1995年以前的社会保险费吗?退休5年后,发现用人单位缴费基数不实,能否要求用人单位补缴社保费?补缴后养老金又如何调整?用人单位若干年前未缴社保费被发现后,还需要缴纳滞纳金吗?这些问题都涉及时效,实践中与理论上均存在很大争议。 In January 2012 can I ask for the payment of social insurance before 1995? After five years of retirement, I found that the employer’s contribution base is not real, and can it require the employing unit to pay the social insurance premium? How to adjust the pension after the payment? After the employer has found out that the social insurance premiums have not been paid for some years ago, do they still have to pay the late fees? These issues are time-bound, and there are many controversies in practice and theory.