Free retirement shortfall calculator
See the exact gap between what you'll have and what you need. Enter your projected nest egg, desired income, and withdrawal rate, and the calculator returns your shortfall or surplus in dollars — updated live, as you type.
On this page11 sections
| Year | Start balance | + Growth | − Withdrawal | End balance |
|---|---|---|---|---|
| 1 | $500,000 | $30,000 | $40,000 | $490,000 |
| 2 | $490,000 | $29,400 | $40,000 | $479,400 |
| 4 | $468,164 | $28,090 | $40,000 | $456,254 |
| 7 | $430,247 | $25,815 | $40,000 | $416,062 |
| 10 | $385,087 | $23,105 | $40,000 | $368,192 |
| 13 | $331,301 | $19,878 | $40,000 | $311,179 |
| 16 | $267,240 | $16,034 | $40,000 | $243,275 |
| 19 | $190,943 | $11,457 | $40,000 | $162,400 |
| 22 | $100,073 | $6,004 | $40,000 | $66,077 |
| 24 | $30,042 | $1,803 | $31,844 | $0 |
Estimates only, on a constant return and fixed withdrawal. Not financial advice.
Results are estimates. Consult a professional.
What the retirement shortfall calculator measures
The retirement shortfall calculator measures the gap between what your savings are projected to be and what you actually need to fund your desired income. Enter your projected nest egg, the annual income you want, and a withdrawal rate — it computes the target lump sum and tells you, in dollars, whether you have a shortfall or a surplus.
A shortfall is the most actionable number in retirement planning. A projection alone tells you a balance; a target alone tells you a goal. The shortfall is the difference — the exact dollar figure you must close, and the one that tells you how hard to pull each savings lever and how soon.
How the shortfall is calculated
The calculation is two steps: build the target from your desired income, then subtract your projected savings from it.
The withdrawal rate that anchors the target comes from the Trinity Study and Bengen's 4% research on sustainable withdrawals over a 30-year retirement. Choosing a lower rate raises the target — and so widens any shortfall — because a cautious plan asks the portfolio to support the same income with less risk of running dry.
Cooley, Hubbard & Walz (Trinity Study) and Bengen (1994) — the 4% safe withdrawal rate behind the target.A worked example: a $750,000 shortfall
Aisha projects a $750,000 nest egg at retirement, wants $60,000 a year from her savings, and plans around a 4% withdrawal rate. These are the calculator's defaults, so you can reproduce the result.
Step 1 — Build the target
Step 2 — Subtract the projection
Step 3 — Read the shortfall
Shortfall by projected savings and income goal
Your shortfall depends on both how much you are projected to have and how much income you want. The table fixes the withdrawal rate at 4% and shows the gap for a range of projections against three income goals (a positive number is a surplus).
| Projected nest egg | $50k income (target $1.25M) | $60k income (target $1.5M) | $80k income (target $2.0M) |
|---|---|---|---|
| $750,000 | −$500,000 | −$750,000 | −$1,250,000 |
| $1,000,000 | −$250,000 | −$500,000 | −$1,000,000 |
| $1,250,000 | $0 | −$250,000 | −$750,000 |
| $1,500,000 | +$250,000 | $0 | −$500,000 |
| $2,000,000 | +$750,000 | +$500,000 | $0 |
Gap = projected − target, at a 4% withdrawal rate. Negative = shortfall; positive = surplus. Figures computed by this calculator.
How to close a retirement shortfall
A shortfall is closed by pulling one or more levers. The earlier you spot it, the gentler the fix — a gap found at 40 needs a far smaller monthly bump than the same gap found at 60, because there are more years for the change to compound.
- Increase contributions. Raise the monthly amount — the most direct lever. Use the 2025 catch-up limits if you are 50+ ($7,500 extra to a 401(k), $1,000 to an IRA) or 60–63 (a $11,250 super catch-up).
- Delay retirement. Each additional working year adds contributions, compounds the existing balance longer, and shortens the retirement the nest egg must fund — a triple effect.
- Lower the income target. Trimming desired spending cuts the target by 25× the reduction — $4,000 a year less spending drops the target by $100,000.
- Capture the full employer match and reduce fees. Free match money and lower-cost funds both lift the projection without you saving an extra dollar.
What a surplus means
If your projection exceeds the target, the calculator shows a surplus — and that opens choices rather than problems:
- Retire earlier than planned, since the target is already met.
- Spend more in retirement by raising the income goal the surplus can support.
- Build a safety margin against a long life, market downturns, or higher-than-expected healthcare and long-term-care costs.
- Leave a larger legacy to family or charity.
A surplus is not a signal to stop planning — sequence-of-returns risk and inflation can erode it. Re-check the gap yearly, size the target with the retirement nest egg calculator, and see what your savings produce as income with the retirement income calculator.
Accuracy, assumptions, and sources
This retirement shortfall calculator divides your desired income by the withdrawal rate to set a target, then subtracts your projected nest egg to find the gap. It uses the income from savings only — net out Social Security or pension income before entering it — and assumes the 4% rule's roughly 30-year horizon. Results are planning estimates, not guarantees or financial advice; they exclude taxes, fees, and sequence-of-returns risk. Confirm contribution rules at IRS.gov and consult a qualified adviser.
Cooley, Hubbard & Walz — Trinity Study on sustainable withdrawal rates.IRS — Retirement topics: contribution and catch-up limits (2025).Frequently asked questions about the free retirement shortfall calculator
About this retirement shortfall calculator
This retirement shortfall calculator runs entirely in your browser — your numbers stay on your device. It divides your desired income by the withdrawal rate to set a target nest egg, then subtracts your projected savings to return the shortfall or surplus in dollars, updating instantly as you type.
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