Use this calculator to see how additional contributions to your 401(k) plan can add up over time.  Enter the additional monthly contribution and select your tax bracket, matching employer contribution and expected rate of return, and see how your additional contributions would grow--with and without the employer match.  Looking at historical returns, a good rule of thumb for estimating a rate of return is that over the long term, conservative investors will earn an average of 6% to 8% annually, while aggressive investors will average 9% to 11% annually.
For more information, check out our Retirement Community Discussion Forum.

How Additional Contributions Affect Your Balance
Additional monthly contribution:
Your tax bracket:	10% 15% 25% 28% 33% 35%
Matching employer contribution:	No match 25% 33% 50% 100%
Expected annual rate of return:	6% 7% 8% 9% 10% 11% 12% 13% 14% 15%
Over a period of:	1 year 5 years 10 years 20 years 30 years
Extra contributions (pre-tax):
Cost after tax savings:
Total savings at end of period:
With employer match: