Please follow https://www.bls.gov/opub/mlr/2015/article/automatic-enrollment-employer-match-rates-and-employee-compensation-in-401k-plans.htm#top.

Please follow https://www.bls.gov/opub/mlr/2015/article/automatic-enrollment-employer-match-rates-and-employee-compensation-in-401k-plans.htm#top.