I fully understand completing an 8606 form for the completion of non-deductible contributions to an IRA. What I am concerned about is how to report post-tax 401-K contributions, if required to do so. These contributions are significantly higher than the non-deductible contributions to my IRA, and I want to be sure that I don't run afoul or the IRS, or pay tax on what has already been taxed, when it comes time to withdraw from my 401-K (hopefully very soon). I have done a fair amount of research on Google and the IRS web page and don't seem to find anything that pertains.
Any information will be appreciated.
Regards, Dan