@schoenba - You cannot combine basis. You only need a new 8606 if there is new non-deducible contribution or a distribution, otherwise the last filed 8606 remains in effect. You would only get a "combined" basis if you failed to select the spouse that the Contribution or distribution was for. TurboTax used the spouse check box to produce either a 8606-T (Taxpayer or first person listed on the tax return), or 8606-S (Spouse or the second taxpayer listed on the tax return).
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
