109%!
I've noted my net worth has been nearing my total gross income lately, but never considered the comparison on an after-tax basis. When I calculate it that way, apparently I've already broken the 100% level (at least a current stock prices). Woo hoo!
This was achieved with a fairly steady 75% (post-tax) savings rate over a working career from 1999 to today, and a 9% personal rate of return (IRR) over that period.