I want to contribute the maximum to my 401k for this year. I have some money already deducted from each paycheck, but I want to make a one time payment to bring me up to the maximum for 2006. I called my company's 401k provider and they said this is not allowed. Is this true? do I have any other options?

The only thing you can do is increase the % of your paycheck before the end of the year. You will need to know how long it will take for the change to take effect and should increase the contribution rate based on how much money you want to add over the remaining pay periods.

Fuskie
Who agrees it is true you can not make a lump sum year-end contribution...