The difference between social security contribution 15 and 20 years.

The most basic difference between 15 and 20 years is that the longer the payment period, the higher the retirement benefits. In addition, when adjusting retirement benefits, 20 years of contributory service is a length of service, that is, how much the retirement fee for more than 20 years will increase.

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The above answer is only for the current information combined with my understanding of the law, please refer carefully!

If you still have questions about this issue, I suggest you sort out relevant information and communicate with professionals in detail.