Contributing to Multiple 401(k) Plans
It would be helpful to have a flow chart on the rules for contributing to more than one 401(k) plan for those that are employed and also self-employed to maximum contributions. Here is some initial information to help you get started. https://www.mysolo401k.net/solo-401k/multiple-retirement-plan-solo-401k-contribution-rules/. Here are the IRS rules https://www.irs.gov/retirement-plans/how-much-salary-can-you-defer-if-youre-eligible-for-more-than-one-retirement-plan.