The formula for the future value of an ordinary annuity is F = P * ( [1 + I]^N - 1 )/I, where P is the payment amount. I is equal to the interest (discount) rate.

The present value interest factor (PVIF) formula is used to calculate the current worth of a lump sum to be received at a future date. The present value interest factor of annuity (PVIFA) is used ...

This annuity expert warns against media accounts of insurance products, and explains why young advisors may not be up to helping retired clients.