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Retirement Income Gap Calculator
Calculate how much savings portfolio you need to fill the gap between your retirement expenses and guaranteed income from Social Security, pension, and other sources.
Annuity, rental, part-time, etc.
Portfolio needed to cover income gap
$1,140,000
Monthly income gap
$3,800
Annual income gap
$45,600
Guaranteed income as % of expenses
37
% covered without portfolio withdrawals
How the math works
Your income gap is what Social Security, pensions, and other guaranteed sources don't cover. The portfolio needed is the savings required to fill that gap at your chosen withdrawal rate.
The 4% rule is a common guideline, not a guarantee. Adjust for longevity risk, healthcare costs, and sequence-of-returns exposure.
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Retirement Income Gap Calculator is built to give a quick, browser-based estimate for retirement income gap. Calculate how much savings portfolio you need to fill the gap between your retirement expenses and guaranteed income from Social Security, pension, and other sources. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the retirement income gap result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this retirement income gap estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter your estimated monthly retirement expenses.
- Add your expected Social Security, pension, and other guaranteed income.
- Set your safe withdrawal rate (4% is the common starting point).
- See the portfolio needed to cover the gap and your guaranteed income coverage ratio.
Frequently Asked Questions
What is a retirement income gap?
The difference between what you need to spend each month and what guaranteed income sources (SS, pension, annuity) provide. The gap must be covered by portfolio withdrawals.
What is the 4% withdrawal rate?
A guideline suggesting you can withdraw 4% of your portfolio in year one and adjust for inflation, with a high probability of the portfolio lasting 30 years. It's a starting point, not a guarantee.
How much guaranteed income is enough?
If your guaranteed income covers 80–100% of essential expenses (housing, food, healthcare), you can take more investment risk. If it covers less, you need a larger conservative portfolio.
How does Social Security affect the gap?
Every extra dollar of SS income reduces your income gap by one dollar, which reduces the portfolio needed at a 4% rate by $25. Delaying SS has a big impact on required savings.
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