It should have been calculated by the account trustee in the year that you turned 70 1/2 or retired, whichever was later, using the method described in the IRC, the same as any other pension. The trustee should know how to calculate RMD's - they must do it for all pensions that they manage.
**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.**
