Retirement Income Gap Calculator
Annual income gap between desired retirement spending and projected income
Calculate your retirement income gap between desired spending and projected income from pensions, benefits, and portfolio withdrawals combined.
What this tool does
This calculator estimates the annual income gap—or surplus—between your desired retirement spending and the income available from all sources combined. It accounts for fixed income streams (such as pensions or national benefits), plus withdrawals from an investment portfolio at your chosen rate. The result shows whether projected income covers your target spending and breaks down contributions from each income source. Portfolio withdrawals typically drive the gap most significantly, since they scale with both portfolio size and withdrawal rate. A common scenario involves someone planning retirement with mixed income sources and needing to know how much portfolio withdrawals must cover. The calculator assumes steady income streams and a constant withdrawal rate; it does not account for inflation, tax implications, or changes in income over time. Results are estimates for educational illustration.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Why Income Gap Analysis Matters
Retirement income comes from multiple sources: social security, pension, portfolio withdrawals, part-time work, rental income. Total income compared to desired spending reveals gap or surplus. Gap requires either reduced spending, additional income source, larger portfolio, or delayed retirement. Surplus suggests over-saving or earlier retirement possibility. The calculator quantifies the specific gap for any combination of sources.
Worked Example for Typical Retirement
Desired annual 60,000. Social security 22,000. Pension 8,000. Other income 0. Portfolio 750,000. Withdrawal 4%. Fixed sources: 30,000. Portfolio income: 30,000. Total: 60,000. Gap: 0. The retiree exactly meets desired income at sustainable withdrawal rate. Higher desired income or lower portfolio creates gap requiring planning. Lower desired income or higher portfolio creates surplus enabling earlier retirement or more discretionary spending.
What the Calculator Does Not Model
Inflation effects on desired income across retirement years. Tax effects on different income source types. Healthcare cost growth typically exceeding general inflation. Long-term care needs spiking late-life expenses. Specific portfolio sustainability beyond withdrawal rate assumption. Variable income from part-time work or rental.
The levers in this calculation
The inputs — Desired Annual Income, national pension system Annual, Pension Annual, Other Income Annual, and Portfolio Size — do not pull with equal force. The rate and the time horizon usually dominate — compounding means a small change in either reshapes the final figure more than a similar shift in contribution size. Test this by doubling one input at a time.
How the math works
Total income sums fixed-stream sources plus portfolio income at withdrawal rate. Gap subtracts total from desired. Results are estimates for illustration only.
How to use this beyond the first run
Re-run the calculation once a year. Life changes — pay rises, new expenses, interest-rate shifts — and the figure that looked right 12 months ago often isn't today. Annual recalibration keeps the plan honest.
What this doesn't capture
The calculation assumes a steady savings rate and a stable interest rate. Real saving journeys include emergencies, windfalls, and rate changes — especially in easy-access products. The figure is a direction of travel, not a guarantee.
Desired $60,000 minus social security plus pension plus portfolio income shows 0.00 gap.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes the annual retirement income gap by summing all income sources and comparing the total to desired spending. Fixed income streams—such as pensions and regular payments—are added directly. Portfolio income is calculated by applying the withdrawal rate (expressed as a percentage) to the total portfolio size. The resulting total income is then subtracted from the desired annual income figure to determine the gap. The model assumes a constant withdrawal rate and stable income streams throughout retirement, with no adjustment for inflation, fees, tax consequences, or changes in portfolio value over time. Results represent a single-year snapshot and serve as estimates for illustration only.
References
Frequently Asked Questions
to use 4% withdrawal rate?
Does this account for inflation?
What if I have a gap?
What about taxes?
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