What Tax Form for Roth 401k Contributions

[beekrock]

I am self-employed and opened a Solo Roth 401k this year. What tax form do I use to show my 2010 contribution?

[flyingron]

You don't use any form. That contribution is taxable

[beekrock]

Thanks, Flyingron. How does the IRS know that I made a Roth contribution or if I contributed too much to it? Or, would those issues only come up if I were audited and/or reached $250k in the Roth?

[llworking]

Your contribution is reported to the IRS by the investment company, therefore the IRS knows that you made the contribution. It is reported on form 5498