I had a 401k plan at my previous employer and we could contribute 100% of our earnings to our plan. There were not to o many people that contributed this amount though. I probably only contributed about 20% of my income to my 401k plan. I know that it does depend on your employer what the limit is on the amount that you can contribute. You can find the information that you need at,
. http://www.todaysseniors.com/pages/401k_contribution_limits.html.