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Income and Expenses
Income: Your annual income should increase at approximately the rate of inflation over the remaining years of employment. Some people will do better than this, some will not do as well. For our purposes, the average will be sufficient. Expenses:
Your annual expenses will decrease in retirement by about 35% on average. Sample Calculation: To best understand these effects we will go through a sample calculation for a typical family of two, looking at income, expenses, and savings. We will calculate:
Basis and Assumptions The calculations will be based on the following assumptions:
Inflation Factor Table: Before starting calculations, we need an Inflation Factor Table. This table illustrates how costs can escalate with years, even for a low inflation rate of 3.0 %/year. Equation 1 Fn = (1 + i )n
Where:
Inflation Factor - Table 1
Income at Retirement: Future income can be estimated from today's income by adjusting for the rate of inflation. Equation 2 In = I0 * Fn
Where: For the case where todays Income = $40,000 (abbreviated as 40k) and years to retirement = 20 I20 = 40k * F20 I20 = 40k * 1.81 = 72.4k Your Calculated Income:Now, here is an applet for you to estimate your specific income the year before retirement. Just input your numbers and then press Enter.
Expenses in retirement:Expenses in year one of retirement is assumed to to be 65% of the final income before retirement. Equation 3
E0 = I20 * 0.65 Future years expenses in retirement will raise at a rate slightly less than inflation. For these calculations I have assumed a rate only 2/3 as rapid, i.e., a 2.0 % rate. Equation 4 En = E0 * F(n - 1)
E5 = 47k * 1.10 = 52k Your Calculated Expenses:Now, here is an applet for you to estimate your specific expenses after retirement. Just input your estimated final year's salary from the applet calculations above, then press Enter.
As you can see,
See the section on Savings for information on how to be prepared for these escalating costs. |