Retirement Income Gap Calculator
Your retirement income gap is what your savings must cover after Social Security, pension, and other guaranteed income. A $5,000/month expense with $1,800/month Social Security leaves a $3,200/month gap — $38,400/year your portfolio must provide. This calculator shows if your savings are enough.
Enter your expected monthly expenses, Social Security and pension income, and current savings to see your income gap, implied withdrawal rate, and whether your portfolio can sustain your retirement lifestyle.
Income Breakdown
Portfolio Required at Different Withdrawal Rates
| Withdrawal Rate | Portfolio Needed | Gap vs Current |
|---|
Understanding Your Retirement Income Gap
Most people enter retirement with a patchwork of income sources — Social Security, a pension if they are lucky, perhaps some part-time work — and a savings account they will draw down over decades. The income gap is the amount that must come from savings after all guaranteed sources are accounted for. Getting this number right is the foundation of retirement planning.
The calculation is straightforward: Total monthly expenses minus all guaranteed monthly income equals your monthly gap. Multiply by 12 for your annual gap. Then divide by your chosen withdrawal rate to find the portfolio you need. If your current savings fall short of that target, you either need to save more, reduce expenses, increase guaranteed income, or accept a higher withdrawal rate with its associated risk.
The Power of Guaranteed Income in Closing Your Gap
Every dollar of guaranteed income (Social Security, pension, annuity) permanently reduces the portfolio withdrawal burden. Consider: a couple spending $7,000/month with $2,500/month combined Social Security has a $4,500/month gap — needing $1,350,000 at a 4% rate. If one spouse delays Social Security by 4 years and adds $800/month in benefit, the gap shrinks to $3,700/month — needing $1,110,000. That four-year delay created $240,000 in "virtual portfolio" value. Use our safe withdrawal rate calculator to model different portfolio-drawdown strategies once you know your gap.
Why the Gap Changes Over Time
Your income gap is not static. Social Security benefits receive annual cost-of-living adjustments (COLA) linked to inflation — so that income source maintains its real value. But pension income from private employers is often fixed in nominal terms, which means inflation erodes its purchasing power each year. At 3% annual inflation, a $1,000/month pension loses half its real purchasing power in 23 years.
Meanwhile, healthcare spending typically increases in your 70s and 80s, widening the gap. Many retirement planners use a "smile" spending curve: higher expenses in the active early retirement years (60–74), lower in the quieter middle years (75–84), and higher again in the final years due to healthcare and care costs.
| Situation | SS Income | Monthly Gap | Portfolio Needed (4%) |
|---|---|---|---|
| No guaranteed income | $0 | $5,500 | $1,650,000 |
| Single SS at 62 | $1,400 | $4,100 | $1,230,000 |
| Single SS at 67 (FRA) | $2,000 | $3,500 | $1,050,000 |
| Couple SS both at 67 | $3,600 | $1,900 | $570,000 |
| SS + pension $1,200/mo | $2,000 | $2,300 | $690,000 |
Strategies to Close a Large Income Gap
Delay Social Security: Each year you delay past 62 (up to age 70) adds 6%–8% to your benefit. Work part-time: Even $1,000–$1,500/month from part-time work in your early retirement years dramatically reduces portfolio withdrawals and extends longevity. Downsize: Selling a high-equity home and moving to a lower-cost area can both generate lump-sum savings and reduce monthly expenses. Add annuity income: A portion of savings converted to an income annuity provides guaranteed income for life, reducing the gap permanently. Reduce discretionary spending: The gap from your fixed expenses (housing, healthcare) is non-negotiable, but travel and entertainment can flex downward in bad portfolio years.
For detailed strategies on how to fill different types of income gaps, see our guide on closing your retirement income gap. To understand how your withdrawal strategy affects the survivability of your portfolio once the gap is set, read about portfolio withdrawal strategies.
Frequently Asked Questions
What is a retirement income gap?
A retirement income gap is the difference between your total retirement expenses and your guaranteed income sources (Social Security, pension, annuity). The gap is what your investment portfolio must cover each year. For example: $5,000/month in expenses minus $1,800/month Social Security = $3,200/month gap = $38,400/year from savings. At a 4% withdrawal rate, you need $960,000 in savings to cover this gap.
How much savings do I need to fill my income gap?
Divide your annual income gap by your planned withdrawal rate. At 4%: multiply your annual gap by 25. If your gap is $40,000/year, you need $1,000,000. At 3.5%: multiply by 28.6. At 5%: multiply by 20. The more guaranteed income you have, the smaller your gap and the less portfolio you need.
When should I claim Social Security to minimize my income gap?
Delaying Social Security from 62 to 70 increases your monthly benefit by 76%–77%. Every year you delay past 62 adds roughly 6%–8% to your annual benefit permanently. If you can cover expenses from savings or part-time work in your early 60s, delaying Social Security is often the single most powerful way to reduce your lifetime income gap.
Does my income gap change over time?
Yes. Social Security benefits receive annual COLA adjustments, which maintains their real value. Pension income is typically fixed, so inflation erodes its purchasing power. Healthcare expenses tend to rise in your 70s and 80s. Many financial planners use a "retirement spending smile" — higher in active early years, lower in mid-retirement, higher again in final years for healthcare.
What if my withdrawal rate is above 5%?
A withdrawal rate above 5% carries significant depletion risk over a 20–30 year retirement. Options include: delaying retirement to save more, delaying Social Security to boost guaranteed income, reducing planned expenses, working part-time in early retirement, or converting some savings to an income annuity. Even $500/month of additional guaranteed income reduces the annual portfolio gap by $6,000.
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