How much can I contribute to my 401k plan at work?

Individuals with access to a 401k plan at work can contribute up to a maximum amount per year, based upon their age and the given tax year. For example, investors within the 2009 tax year who are 49 and below can contribute up to $16,500 per year into their 401k plan, while participants age 50 and older can contribute up to $22,000.