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Can my employer limit my maximum 401k contribution amount (below the IRS limit)?
One description of what happened is at 401(k) Plan Fix-It Guide.  The issue is the plan was "Top Heavy," i.e. those making a high income were making disproportionately larger deposits than the lower paid employees. As the IRS article suggests, a nice matching deposit from the employer can eliminate the lower limit caused by the top heavy-ness.  Searching on [top heavy 401(k)] will yield more details if you wish to research more.