I used to have a traditional IRA account that was entirely funded with non-deductible contributions.
Then I had a huge rollover from a 401(k) to a (separate rollover) IRA. The traditional IRA was so small that it didn't have the flexibility and favorable treatment that the (rollover) IRA was getting. So I transferred all of the traditional IRA holdings into the (rollover) IRA. At the time my understanding was that the only downside was that it prevented me for ever rolling the rollover back into an employer 401(k) plan. This was fine by me.
Now comes this 2010 one-time opportunity to convert Traditional IRAs to Roth IRAs without any income limitations. Since the contributions to the traditional IRA were 100% non-deductible at the time and it's all under water now anyway--may still be next year, we'll see--I'm wondering if there is a way to convert a portion of the rollover IRA attributable to the old traditional account to a Roth next year? If so, how would I figure out the attributable portion? (Obviously, none of the money that came from the
401(k) has ever seen the tax man, so the tax liability to convert that portion to a Roth makes that probably unattractive.)Thanks for any advice!
Dick