I am currently getting several pensions and have a fair amount of money in a retirement fund that I will (by law) have to start drawing on in a few years. Currently I control the investments (at least to an extent).
I have been looking into an "immediate" annuity at the time I have to start drawing down this fund. I am not looking for the annuity as an investment vehicle. You will notice that people as Orman and Ramsey talk about investment annuities as something to avoid.
As far as immediate annuities, there are three types in two classes.
Class one is a straight annuity. This will pay a fixed dollar amount every month for the rest of your life, no matter how long you live.
1st in this class is a life annuity. If you die after the first payment has been made your heirs do not get anything. This will give you the maximum monthly payment.
2nd in this class is "X" Years Certain. Here the monthly payments are a bit smaller than in 1, if you die before the end of the period (usually 5 or 10 years) payments will continue to you heirs until the end of the period.
3rd in this class is the "Return of Premium". The monthly payment is less than in #2. If you die before the complete original depoist has been paid out, payments to your heirs will continue receiving payment until the original deposit amount has been paid out. Usually this means about 14 years of total payments.
The other class is increasing payments. It has the same three categories, Life Annuity, "X" Years Certain, or Return of PRemium. The initial monthly payment is substantially less than straight line. However, if you factor in a 3% (compounded) increase in payment, at about year 10 or 11 the payment amount will be larger than the straight line payment amount, and around year 19 or 20 the total of payments received by this method will be equal to or larger than the sum of the payments received using straight line.
Two factors will affect your decisions. One is a realistic estimation of your life expectancy and the other is what, if anything, you want to leave to others.