Sample results The result for the necessary zprop given by (Ret-03) depends critically on the assumptions made. As an example, one might assume that price inflation will be 3.5% per year forever and that one's pay will increase only at that same rate of 3.5%. If a 4.5% per year nominal rate of interest is assumed, then (using 1.045/1.035 in real terms) pre-retirement and post-retirement net interest rates will remain the same, irel to pay = 0.966 percent per year and ireal = 0.966 percent per year. These assumptions may be reasonable in view of the market returns available on inflation-indexed bonds, after expenses and any tax. Equation (Ret-03) is readily coded in Excel and with these assumptions gives the required savings rates in the accompanying picture.
Sample results The result for the necessary zprop given by (Ret-03) depends critically on the assumptions made. As an example, one might assume that price inflation will be 3.5% per year forever and that one's pay will increase only at that same rate of 3.5%. If a 4.5% per year nominal rate of interest is assumed then (using 1.045/1.035 in real terms) pre-retirement and post-retireme,nt net interest rates will remain the same, irel to pay = 0.966 percent per year and ireal = 0.966 percent per year. These assumptions may be reasonable in view of the market returns available on inflation-indexed bonds, after expenses and any tax. Equation (Ret-03) is readily coded in Excel and with these assumptions gives the required savings rates in the accompanying picture.