Question: what is the maximum dollar amount you can contribute to a 401k?
Answer: Given the plans' valuable tax breaks, it makes sense to invest the maximum if you can. There are annual limits. In 2016, if you are under 50 years old, you can contribute a maximum of $18,000. If you're 50 or older, you can make an additional catch-up contribution of as much as $6,000, for a total of up to $24,000.