How Much Annuity Income Do You Need in Retirement?
Your retirement income gap is your essential monthly expenses minus your guaranteed income from Social Security and any pension. If you spend $5,000 a month and Social Security covers $2,800, your $2,200 monthly gap is what an annuity or other guaranteed income needs to fill. That is $26,400 a year of income you cannot afford to leave exposed to market swings. The calculator below turns your numbers into a clear gap figure, then estimates the premium an immediate annuity would take to cover it.
Retirement Income Gap Calculator
Find out how much guaranteed income you still need - and the lump sum required to fill the gap with a SPIA.
Income Gap Analysis
| Annual gap | |
| SPIA premium needed to close gap | |
| Lump sum needed at 4% withdrawal rule |
SPIA estimate uses 2026 average payout factors. The 4% rule assumes a balanced portfolio and 30-year horizon. A SPIA fills the gap with less capital because it pools longevity risk.
How to Use the Retirement Income Gap Calculator
- Enter your essential monthly expenses. Add up housing, food, healthcare and Medicare premiums, utilities, insurance, and transportation. These are the bills that must be paid no matter what the market does.
- Enter your guaranteed monthly income. Include your Social Security benefit plus any pension. Leave out withdrawals from savings, because those are not guaranteed for life.
- Read your gap and the premium estimate. The calculator subtracts guaranteed income from essential expenses to show your monthly gap, then estimates the annuity premium needed to cover it.
Why the Income Gap Matters More Than the Lump Sum
Most retirees focus on a single savings number. A more useful question is how much guaranteed monthly income you still need after Social Security and pensions. Retirement spending is monthly, not annual. Your bills, groceries, and Medicare premiums hit on a monthly cycle. If your monthly guaranteed income is less than your monthly essential expenses, you have a gap that must be filled either by drawing down savings or by guaranteed income from an annuity. Covering that gap with guaranteed income means the essentials are paid for life, and the rest of your portfolio is free to grow, handle emergencies, or pass to heirs. To see how the math works for a specific payout, run the immediate annuity calculator next.
How a Couple Closes Their Gap
Tom and Susan are both 65 and ready to retire. Their essential monthly expenses come to $5,000: mortgage payoff is done, but property taxes, food, Medicare premiums, utilities, and insurance still add up. Their combined Social Security benefit is $2,800 a month. Entering those numbers, the calculator shows a monthly gap of $2,200, or $26,400 a year.
They decide to cover the full gap with a joint-life immediate annuity so the income continues as long as either of them is alive. At a payout rate near 6%, covering $26,400 a year takes a premium of roughly $440,000. That leaves the remainder of their $750,000 in savings invested for growth and unexpected costs.
With the essentials guaranteed, Tom and Susan stop worrying about a bad year in the market wiping out their grocery budget. Their portfolio now funds travel and gifts to grandchildren, not the light bill.
How Much Capital Does It Take to Fill a Gap?
There are two common ways to fund an income gap, and they require very different amounts of capital.
The first is the 4% rule, where you withdraw 4% of a portfolio in the first year and adjust for inflation after that. To generate $26,400 a year under the 4% rule, you would set aside about $660,000. The second is an immediate annuity, which pools longevity risk across many buyers. Because the insurance company pays for life and stops at death, it can offer a higher rate, so the same $26,400 a year takes roughly $440,000 at a 6% payout. The annuity covers the gap with about $220,000 less capital, money that stays in your portfolio for growth, emergencies, or legacy.
| Method | Capital needed for $26,400/year | Lasts for life? |
|---|---|---|
| 4% rule withdrawal | About $660,000 | Only if the portfolio holds up |
| Immediate annuity (6% payout) | About $440,000 | Yes, guaranteed |
A common approach is to cover only essential expenses with guaranteed income and keep discretionary spending in a flexible portfolio. If you have not claimed Social Security yet, the size of your benefit changes the whole equation, so it is worth modeling your filing age with the Social Security claiming calculator before deciding how big your annuity needs to be.
Ways to Close the Gap
An immediate annuity is the most direct option, but it is not the only one.
- Single premium immediate annuity. You hand the carrier a lump sum and income starts right away, usually within a month. It pays the most income per dollar but has no growth and limited liquidity.
- Income rider on a fixed indexed annuity. An income rider turns on a guaranteed lifetime payout later while the contract value can still grow. It pays less income per dollar than an immediate annuity but keeps a death benefit and upside potential.
- A multi-year guaranteed annuity bridge. If you plan to delay Social Security or a pension, a short MYGA can deliver a fixed rate for a set term to bridge the years before guaranteed income starts.
We work with 90+ top annuity companies, so our team can compare payout rates across carriers before you lock in a contract. For unbiased background on how annuities fit a retirement plan, the SEC’s investor.gov annuities overview is a solid starting point.
What the Gap Calculator Does Not Show
- Inflation. A level annuity payment does not grow. To keep pace with rising costs, you can ladder annuities over time or add a cost-of-living rider, which lowers the starting payout.
- Healthcare cost growth. Medicare premiums and out-of-pocket costs often rise faster than general inflation, so build in a cushion for them.
- Taxes. Annuities bought with after-tax money use an exclusion ratio, while annuities funded from an IRA are fully taxable as ordinary income.
- A surviving spouse. A joint-and-survivor annuity pays a bit less each month but continues for two lives, which usually matters more than the smaller check.
Frequently Asked Questions
What is a retirement income gap?
A retirement income gap is the shortfall between your essential monthly expenses and your guaranteed monthly income. Add up the bills you must pay, such as housing, food, healthcare, and utilities, then subtract Social Security and any pension. Whatever is left over is the gap you need to fill, either by drawing down savings or by adding guaranteed income.
How much money do I need to cover my income gap?
It depends on the size of the gap and how you fund it. To cover a $2,200 monthly gap, or $26,400 a year, you would need about $660,000 under the 4% rule or roughly $440,000 with an immediate annuity paying near 6%. The annuity covers the same gap with less capital because it pays for life and pools longevity risk across many buyers.
What is the 4% rule versus an annuity?
The 4% rule withdraws 4% of an investment portfolio in the first year, then adjusts for inflation, and aims to last about 30 years. An annuity is a contract: you give the carrier a lump sum and they pay a guaranteed amount for life. The 4% rule offers flexibility and growth potential but no guarantee, while an annuity offers certainty and uses less capital for the same income.
Does an annuity guarantee lifetime income?
Yes. An immediate annuity or an annuity with a lifetime income rider pays a guaranteed amount for as long as you live, no matter how markets perform or how long you live. The guarantee is backed by the issuing insurance company, so carrier financial strength matters, and a joint option can extend the income across both spouses’ lives.
How does inflation affect my income gap?
Inflation makes your gap grow over time, because your essential expenses rise while a level annuity payment stays the same. A $2,200 gap today could be noticeably larger in ten years. You can address this by adding a cost-of-living rider, laddering several annuities over time, or keeping part of your savings invested for growth to supplement the guaranteed income.
For more tools, visit the annuity calculators hub to compare income strategies side by side.
