Just running some numbers for the OP's pension and assuming an 35 year joint lifespan and 3% COLA the IRR is 6.5%, so this is a good deal
I've got a similar option available to me through a state retirement plan (though not as lucrative) and am curious what sort of IRR would be considered good?
There are a couple of complicating factors, but just considering the basics of the additional annuity, I get the following numbers. Buy-in of 100K yields $414/month starting at age 60, with a COLA matching CPI from 0 up to 3%. IOW, it won't go down. Think I did the calc correctly, but I get IRR of 4.5% assuming 25 years (to age of 85 with full 3%/year to match the previous calc).
Thoughts?