Some clarification from the above findings, let's say the person has 40k in RA, you receive the monthly payout, does the 4% interest gets paid out?
Or like how it is discovered, it'll still be drawn down on the 40k up til 80 years old, any interest is only 'distributed' if you live beyond that
there are a number of points here.
first we are talking about cpf life standard. if is only valid if totally bochap your cpf or you choose standard.
second in cpf life standard, your money is not in ra, it is in cpf life premium. anyway it is pandan leaf by any name would smell as fragrant.
third is the interest earn by the cpf life premium does not add onto itself. it is placed in another place called the lifelong income fund, together with the interest of all the other cpf life members.
fourth we know that it is drawn down to 0 at 80 by two area: 1 is from the cpf website. second is through maths. you take the 40k and divide by the payout. that will give you the months that the 40k can last. you add that to your draw down age and it is 80 years old.
fifth is also from cpf website and common sense. you got no more money at 80. who is going to pay you? our cheng hu? in your dreams our cheng hu so nice. so it has to come from interest that is from the income fund.