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← Back to Retirement Income hubRetirement Income Gap Analysis
An income gap analysis shows how much monthly shortfall remains after Social Security, pensions, and other reliable sources cover essential bills.
Many retirement plans start with portfolio balances, but families often make better decisions when they start with monthly essentials. A retirement income gap analysis compares must-pay expenses to dependable income already in place—then measures the shortfall. That gap number is what annuities, part-time work, or adjusted spending targets often try to solve.
How to calculate the gap
Step 1: list essential monthly expenses (housing, utilities, insurance, food, medical premiums, core transportation).
Step 2: subtract predictable income (Social Security, pension, rental income, existing annuity payments).
Step 3: the remainder is your monthly gap—the amount that must come from portfolio withdrawals, work, or new income tools.
This connects directly to retirement income floor strategy and tax-aware withdrawal planning.
Practical example
Essential monthly needs: $6,100. Social Security and a small pension total $4,200. Gap: $1,900/month ($22,800/year).
The household keeps investments for flexibility but evaluates whether part of the gap should be covered by a conservative income tool.
They run scenarios in the retirement income calculator and compare longevity assumptions from how long $500K may last and how long $1 million may last pages.
Who this may fit
- Pre-retirees within 5 years of stopping work who need a concrete monthly target
- Retirees unsure whether portfolio withdrawals can cover essentials every year
- Families comparing <a href="/annuities/fixed-annuity-vs-cd">fixed annuity vs CD</a> for part of the gap
- Couples coordinating {_link('/social-security/when-should-i-take-social-security', 'Social Security timing')} with expense coverage
Who this may not fit
- Households whose guaranteed income already exceeds essential expenses with margin
- High-net-worth estates focused primarily on legacy transfer rather than monthly cash flow
- People without a defined essential vs discretionary spending split yet
- Anyone expecting one formula to replace personalized professional review
Common mistakes
- Using total spending instead of essential spending in the gap calculation
- Forgetting Medicare premiums, property tax spikes, or home maintenance
- Assuming portfolio withdrawals will always be available at the same rate
- Ignoring taxes on gap-filling withdrawals—see <a href="/annuities/do-you-pay-taxes-on-annuity-income">annuity and withdrawal tax basics</a>
- Filling the entire gap with one product instead of layering sources
Planning takeaway
A gap analysis turns retirement planning into a monthly reality check. Once the gap is defined, compare tools—annuities, ladders, adjusted spending—against monthly income strategies with clear numbers.
Frequently asked questions
What is a retirement income gap?
It is the monthly or annual shortfall between essential expenses and predictable income sources like Social Security and pensions.
Should the gap include discretionary spending?
Most planners start with essentials to define the floor, then layer discretionary goals separately.
How often should I recalculate the gap?
Review annually and after major events such as relocation, health changes, or the loss of a spouse.
Can annuities fill the gap?
Annuities are one option for covering part of a defined gap with contract-based income mechanics, subject to terms and suitability.
What if my gap changes every year?
Use ranges and stress tests rather than one static number. Healthcare and tax changes often shift the gap over time.
Where should I start numerically?
Use a retirement income calculator with conservative assumptions, then refine essential expense categories over time.
Helpful calculator
Use this educational calculator to pressure-test planning assumptions.
Retirement Income Calculator →Download guide
Get a practical checklist to review options with more confidence.
Retirement Income Starter Guide →Retirement Income Starter Guide
Map essential expenses, guaranteed income, and your remaining gap with a plain-English worksheet.
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