I have been searching and searching the regs and IFR for this to no avail. I understand what data pieces need to be used to generate the lifetime income illustration but what is the formula to generate the monthly payments. I imagine it must be so easy that no one else is asking because I do not see it. If I get a question from a client on how the monthly payment was calculated I need to be able to provide that. I've reviewed the standard annuity formulas but those do not seem to be what I am looking for because they require you to know what the monthly payment will be.