Additional thing to factor in . . . . the annuity is for life. Unlike your lump sum which can run out of steam down the road.
Here's what my Finance guy told me when I asked the annuity vs lump sum question.
Look at what you will bring home with the annuity. Now take a lump sum, throw it into some investment vehicle and calculate how much return you'll need on that to match or exceed what you'll get from the annuity.
If the number is doable ( Eg: A sane rate of return ) then the choice boils down to how safe you feel with taking an annuity from a company that's trying it's d*mndest to k–l itself.
On the other hand, if your calculated rate of return is a ludicrous number, now the decision becomes a difficult one. ( Because you're not likely to achieve said number )
Personally, I don't care what the math says. I don't trust AT&T now and I'm certainly not going to trust them to do the right thing with pensions a few decades from now. You all know as well as I do what the first thing is on the chopping block if / when a company declares bankruptcy.
I'm not leaving my retirement fate to the same id–ts that have me questioning it in the first place.
I will take the Lump Sum with zero regrets.