Practical guide
Understanding retirement income gap — sensitivity table
Everyday editorial team · GEOINNOVATION CO., LTD · Published · Updated
What this calculation is for
A retirement-income gap compares a desired spending amount with other income and an illustrative portfolio draw. It makes an unfunded goal visible without assuming that an income target automatically changes the savings projection.
How the method works
Savings grow from the entered balance and deposits until retirement. A withdrawal assumption converts the projected fund to monthly income, which is combined with entered benefits and compared with the target. The displayed model uses: Project savings and estimated monthly withdrawal income; compare with target after entered other income.
A worked example
For an illustrative retirement income gap scenario, use Desired monthly retirement income: 6500 $; Other monthly retirement income: 2200 $; Current retirement savings: 400000 $; Years until retirement: 15 years; Monthly savings until retirement: 800 $; Assumed annual return: 5 %; Initial withdrawal rate: 4 %. The modeled estimated monthly retirement income is $5,678.1. These are example assumptions, not current prices, official benefit amounts or personalized advice.
Assumptions and real-world differences
Benefit estimates, taxation, inflation and a sustainable withdrawal policy require separate review. The result is not a Social Security benefit calculation or a probability that the plan will succeed. Social Security or pension amounts are user estimates; taxes and benefit eligibility are excluded.
Reading the other monthly retirement income sensitivity table
The tool evaluates the same model across a range of other monthly retirement income values while holding other assumptions constant. Choose a realistic low value, high value and number of points. Each row reports the same headline measure; the table is a set of conditional calculations, not a probability distribution or a forecast. Input-step rounding can make nearby rows equal.
Reproduce this tool’s example
These fixed example inputs are independent of edits you make above. Enter them in this tool to reproduce the result, then replace them with your own assumptions.
- Minimum other monthly retirement income
- 1,100 $
- Maximum other monthly retirement income
- 3,300 $
- Number of comparison points
- 5 points
- Desired monthly retirement income
- 6,500 $
- Current retirement savings
- 400,000 $
- Years until retirement
- 15 years
- Monthly savings until retirement
- 800 $
- Assumed annual return
- 5 %
- Initial withdrawal rate
- 4 %
Sensitivity analysis: 5 comparison points
Other monthly retirement income ranges from $1,100 to $3,300.
- Other monthly retirement income: $1,100: $4,578.1
- Other monthly retirement income: $1,650: $5,128.1
- Other monthly retirement income: $2,200: $5,678.1
Frequently asked questions
- Should benefits and the target use the same dollar basis?
- Yes. Avoid comparing a today’s-dollar spending target with unadjusted future-dollar benefits or balances.
- Which inputs should I check before using this retirement income gap estimate?
- Check desired monthly retirement income, other monthly retirement income, current retirement savings, years until retirement, monthly savings until retirement, assumed annual return, initial withdrawal rate. Match each field’s unit and time period, then compare the detailed rows rather than treating the headline alone as the complete answer.
- Does the most favorable row show the most likely outcome?
- No. The table assigns no likelihood to any row. It shows how the result responds to the chosen assumption, and you remain responsible for selecting a plausible range.