Retirement tax questions

Thanks for that - I forgot about the influence form 8606 has on my RMD. I've been tracking the non-taxable portion of  my IRA on 8606 for years and thanks to TurboTax "remembering" my previous years of tax returns, it fills in the values for me (except, of course, end-of-year value).  I'm guessing not a lot of filers have to use form 8606.