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I can max out my 401(k) every year, but every time I get a raise/bonus I have to re-figure out what percentage to set my contributions to. After googling several times with no luck and doing the math myself, I got fed up — this is the entire reason computers exist.
So I built 401k-o.com. Free, no email, no login. Includes a "show me the math" breakdown and a whole-percent rounding toggle for plans that require it.
US only for now — working on expanding that!
401K-OThe 401k maxing calculator that should have already existed.