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Why do some companies offer 401k retirement plans?
Stated plainly... it's a benefit. Companies are not required to offer you any compensation above paying you minimum wage. But benefits attract higher quality employees.  I think a big part of it is that it is the norm. Employees want it because of the tax benefits. Employees expect it because almost all reputable companies of any significant size offer it. You could run a great company, but if you don't offer a 401k plan, you can scare away good potential employees. It would give a bad impression the same way that not offering health insurance would.