I'm considering taking a job at a startup which offers zero benefits. I'm trying to assign a value to all the benefits I would be giving up. But I'm sort of puzzled as to how to value the 401k plan. The employer contribution is easy to value, but what kind of value to you ascribe to the employee portion of the plan? Obviously, there's value in making employee contributions to a 401k (otherwise we wouldn't do it). Is it as simple as saying I contribute $S per year to my 401k and my marginal tax rate is r, so the benefit is $S * r?