The 6% I mentioned above would be an average over your lifetime. I may have earned 9% last year, but maybe I only earn 4% this year with my blended conservative portfolio. Thats OK as I retain control by taking the lump, have instant survivor benefits at no reduction, and don't need to count on Merck being solvent for 30 years. Merck theoretically invests the lump that you turn down when you take the annuity. You get the interest they earn on your lump money as your annuity payment! Take a look at mutual funds that are heavy in corporate bonds and you'll see single digit dividends...although low. Also, did you know Merck self insures it's annuities? Found that out two years ago when I contacted HR. Not sure if it's still true. Best answer would come from a retiree that is getting the annuity. What does it say on the check...Merck or NY Life, Prudential, etc. So if the company still self insures, and has a major event occur again like Vioxx, would they try and stick it to retirees to help pay for the legal fees by declaring bankruptcy on the pension fund which then god to the federal guarantee program that pays a percentage of it? Just something to consider. It's a huge decision. I have a couple CFP's I work with and they all said...take the lump for control. I hope a current retiree can answer the question of who's name is on the annuity check. Merck if it still self insures, or an insurance company that received your lump and is paying you your monthly annuity to you.