what is the relationship between pvif and pvifa 
the pvif formula calculates the current worth of a lump sum to be received at a future date while the pvifa calculates the present value of a series of annuities the bottom linethe present value interest factor of an annuity provides a useful way to determine if a lump sum payment now is a better option than future annuity payments tables exist to help determine the pvifa depending on variable factors such as rates and number of payments or withdrawals a precise factor can be calculated using the formula 