The 4% rule vs. annuities: which produces more retirement income?
The 4% rule is the most famous retirement-income heuristic. Annuities promise more income but less flexibility. Here's the math comparing them — and when each is right.
The 4% rule and lifetime annuities are two answers to the same question — how to turn a pile of savings into income that lasts as long as you do. They are not enemies: the 4% rule maximizes flexibility and legacy while you bear all the risk, and an annuity transfers the risk to an insurer in exchange for giving up liquidity and upside on that money. This guide shows the math behind each, where the 4% rule actually breaks, and why a hybrid "floor-and-upside" approach usually wins.
What each approach actually does
- 4% rule: withdraw ~4% of the initial portfolio in year one, adjust that dollar amount for inflation each year, and history suggests a high (not certain) chance it lasts ~30 years. You keep control, liquidity, upside, and legacy — but you personally bear market and longevity risk.
- Lifetime annuity: you hand an insurer a lump sum in exchange for income that cannot run out. You offload longevity and sequence risk — but give up liquidity, most legacy, and market upside on that money.
The core difference is who holds the risk. With a withdrawal rule, a bad decade is your problem. With a lifetime annuity, it is the insurer's problem — and that risk transfer is the product you are actually buying.
Illustrative single-life payout by starting age — representative levels for A.M. Best A− and above carriers, not a survey or quote. Payout levels as of October 2026. A female buyer's check runs about 4.2% lower at 65 and 7.1% lower at 80, reflecting longer life expectancy. Actual quotes vary by carrier, state, sex and payout option.
The honest comparison
| 4% rule | Lifetime annuity | |
|---|---|---|
| Can it run out? | Possibly (sequence/longevity risk) | No (lifetime option) |
| Liquidity / legacy | Full | Limited |
| Inflation | Built into withdrawals | Only with COLA option |
| Upside | Yes | No |
| Starting income on $1M | ~$40,000/yr | ~$80,000–$84,000/yr |
| Who bears the risk | You | The insurer |
Notice the trap in that "starting income" row. A SPIA's higher first-year check looks like free money, but it is mostly a return of your own principal plus interest — and unless you buy a COLA, it never rises while the 4% rule's payment climbs with inflation every year.
A worked example: $1,000,000 at age 65
Say you have a $1,000,000 portfolio at 65 and need $55,000 a year on top of Social Security. Here is how the two pure approaches and the hybrid stack up, using round, illustrative numbers.
- Pure 4% rule: 4% of $1,000,000 = $40,000 in year one, rising with inflation. That falls $15,000 short of your $55,000 target, so you'd either spend down faster than 4% or trim the budget.
- Pure annuity: a single-life SPIA for a 65-year-old man paying ~8.4% turns $1,000,000 into about $83,800 a year for life. That clears your target — but the income is largely fixed, you've given up the $1,000,000 in liquidity, and heirs get nothing from that premium.
- Hybrid floor: suppose your essential expenses (housing, food, insurance, Medicare premiums) are $36,000/yr. Annuitize enough to cover that: at that ~8.4% payout, $36,000 ÷ 0.084 ≈ $429,000 of premium. That leaves $571,000 invested. A 4% withdrawal on the remainder is ~$22,800, for total year-one income of about $58,800 — above target, with $571,000 still liquid and growing.
The hybrid gives up roughly $25,000 of first-year income versus the pure annuity, but in exchange you keep $571,000 you can tap for emergencies, inflation, or heirs — and the part you annuitized has already removed the risk of ever going to zero on the essentials.
Who each approach is right for
The 4% rule fits you if…
- Leaving money to heirs or charity matters as much as your own income.
- You want full access to the balance for emergencies, big purchases, or healthcare.
- You can tolerate spending cuts in down years and have other income (Social Security, pension, part-time work) as a backstop.
A lifetime annuity fits you if…
- Running out of money is your single biggest fear and you'd trade upside to remove it.
- You have little or no pension and a long expected lifespan or family history of longevity.
- You value a simple, automatic paycheck over managing a portfolio in your 80s and 90s.
Most retirees sit between these poles, which is why the answer is rarely "pick one."
The hybrid usually wins
Mainstream research increasingly favors a blend: annuitize enough to cover essential expenses (removing the catastrophic "run out" risk), then apply a 4%-style withdrawal to the remaining portfolio for flexibility and growth. You get a guaranteed floor and upside — not an either/or.
The logic is behavioral as well as mathematical. When your fixed bills are covered by a check that arrives no matter what the market does, you can leave the invested portfolio alone during a crash instead of panic-selling at the bottom — which is the single most destructive mistake a retiree can make.
Where the 4% rule actually breaks
Bill Bengen's 1994 study tested inflation-adjusted withdrawals from a 50/50 stocks/bonds portfolio against historical U.S. returns and found that a 4% starting rate lasted at least 33 years for every historical start year he tested, even the worst sequences in the data. The 1998 Trinity Study later put the 30-year success rate for a 50/50 portfolio at about 95%. The two failure modes the rule is honest about:
- Sequence-of-returns risk in the first 5–10 years of retirement — a deep bear market combined with withdrawals can shrink the portfolio fast enough that even strong subsequent returns don't recover it.
- Longevity beyond 30 years — if you retire at 60 and live to 95, you're past the 30-year horizon both studies focused on. Bengen's worst case ran dry after about 33 years, and the margin of safety keeps thinning as the horizon stretches toward 35 or 40 years.
Longevity is not a fringe scenario. The Social Security Administration's actuarial tables at ssa.gov show that a 65-year-old has a meaningful chance of living past 90, and for a married couple the odds that at least one spouse lives past 90 are higher still — and one of you reaching 95 is a real possibility. Planning to age 90 when one of you might see 97 is how a "safe" 4% plan quietly becomes unsafe.
How a SPIA changes the math
Using a SPIA to cover your "non-negotiable" expenses — Medicare premiums, property tax, utilities, groceries — converts that portion of retirement income into a guaranteed lifetime check. The remaining portfolio then funds discretionary spending, which is by definition flexible. Research combining a SPIA floor with the rest invested in stocks and bonds has shown materially higher success rates over a 35-year horizon than the pure 4% rule, even with a slightly lower median spending path.
The tradeoff: with a life-only SPIA you give up the option to leave that premium to heirs. A cash-refund or 10-year period-certain option keeps some money for heirs if you die early, for a check roughly 6% to 8% smaller. For households where guaranteed income matters more than legacy, the math is compelling. For households where legacy matters more than income certainty, the 4% rule still wins. Any guarantee here rests on the claims-paying ability of the issuing insurer; annuities are not FDIC-insured.
Mistakes to avoid
- Annuitizing everything. Locking up 100% of your savings leaves no liquidity for emergencies, big medical bills, or a roof replacement. Keep a meaningful invested reserve.
- Ignoring inflation. A level annuity that looks generous at 65 buys far less at 85. Either ladder COLA into the contract or lean on an invested portfolio for rising costs.
- Overlooking insurer strength and guaranty limits. Annuities are not FDIC-insured. Buy from highly rated carriers, and know that state guaranty-association coverage is capped per insurer, per person — confirm your state's limit at naic.org.
- Confusing product types. A simple SPIA is not a variable or indexed annuity. The latter carry layered fees and complexity; read the SEC's and FINRA's plain-language guidance at investor.gov and finra.org before buying anything beyond a plain SPIA.
How to put it together: next steps
- Add up your essential expenses — the bills you must pay regardless of the market.
- Subtract guaranteed income you already have from Social Security and any pension. The remaining gap is your floor target.
- Decide whether to annuitize that gap. If Social Security already covers your basics, you may need little or no annuity; if not, get SPIA quotes from several highly rated insurers.
- Run a 4%-style withdrawal on the rest for discretionary spending, growth, and legacy — and revisit the plan as rates, your health, and your spending change.
The goal isn't to win a debate between two strategies. It's to cover the income you can't live without, then keep as much flexibility and upside as that goal allows.
