My employer allows both an age 50 and 15 year catch-up contribution to my 403(b) retirement plan. How can I get TurboTax to account for the $3,000 15-year catch up?

[lovethecold]

This is exactly my situation.  I have allowable catch-up contributions. 

Your reply "The only way to fix this when filing an original tax return is to be using the desktop version of Turbotax installed on your own computer and overriding the calculation.  Overrides void the accuracy guarantee and can't be e-filed."

I have the desktop version.  When you say "override the calculation". Where?

Thank you!

[MarilynG]

In FORMS mode (upper right corner), choose 'Open Form' and type in 5329 in the Search area.

With the form open, right-click on an amount and a small pop-up menu contains the 'Override' option. 

Here's more info on Overrides.

@lovethecold