Hey John, Consider using this link to make your Required Minimum Distribution calculations:
http://www.bankrate.com/finance/money-guides/ira-minimum-distributions-table.aspxThe calculation is based upon what the IRA, 401k, 403b accounts were worth at years end. So, for instance, if your combined retirement accounts totaled $100,000 and you turned 70 1/2 in 2011, you would have to take out $3,650 ($100,000 / 27.4) by Dec. 31, 2012.
If you don't take your RMD, there is a 50% penalty on the amount you didn't take. RMDs are required because the monies, invested into retirement accounts have never been taxed at all and the govt. wants to guarantee that they get their pound of flesh. Sux for sure.
You can reinvest those funds again if you chose, or buy more toys or bling, but the RMD proceeds get added to your taxable income, may bump you into another tax bracket and gets taxed just like ordinary income.