I only have to take the RMD's in my beneficiary IRA as there were required RMD's when I inherited it. But that was before the law changed requiring that it be drawn down over 10 years. Mine is based on a calculated scale/formula which is based on the age of my last parent at death, my age at the time of inheritance and the balance in the account on 12/31 each year. Came to me in 2006 so RMD's started in 2007. My total cumulative RMD's to date considerably exceed the balance when it came to me, but the account is worth about 3 times what it was when it came to me due to the growth in the largest investment positions, e.g. CAT, BRK.B, NNI, JPM. etc., and free automatic reinvestment of all dividends.