Annuity vs. 401(k): how they actually compare
These two retirement products aren't substitutes — they solve different problems. Here's when each is the better choice.
You don't have to pick between an annuity and a 401(k) — and treating them as rivals is how retirees make expensive mistakes. A 401(k) is a tax-advantaged account that holds investments. An annuity is an insurance contract that turns savings into guaranteed income — you can even hold one inside that account. For most people the order is simple: fund the 401(k) first, always capture the match, then consider an annuity at retirement to cover essential bills. This guide walks through the funding order, a worked dollar example, the fees, the "barbell" strategy, and the mistakes that cost retirees the most.
They do different jobs
A 401(k) is an accumulation engine. It holds investments — usually index or target-date funds — that grow tax-deferred, and most employers add a match. Its whole job is building the nest egg as efficiently as possible while you work.
An annuity is a guarantee and decumulation tool. It's a contract with an insurer that converts a lump sum into guaranteed growth or, more importantly, into income you cannot outlive. One builds the pile. The other turns part of the pile into a paycheck.
Because they solve different problems, you rarely "pick one." The useful question isn't which is better. It's how they work together — and, at retirement, whether to keep the 401(k) invested or convert a slice into lifetime income.
Illustrative projection, not a prediction or a quote: $100,000 at a constant 5% for 20 years, a 24% bracket throughout, no withdrawals, fees or rate changes (a real contract's rate is guaranteed only for its term). Both lines after tax. Deferral changes when you pay tax, not whether; the net advantage here is $14,814, smaller if your bracket rises and larger if it falls.
The funding order that fits most savers
Sequence matters more than any product choice. Capture the highest-return dollars first. Layer guarantees on only after the foundation is built.
- 1. 401(k) up to the full employer match — an instant return (often 50%–100% on your contribution) that no annuity can replicate.
- 2. Knock out high-interest debt, then fill broader tax-advantaged space — an HSA if eligible, then an IRA.
- 3. Max the 401(k) or invest in a taxable account — keep compounding through your working years.
- 4. Consider an annuity at or near retirement — to convert a slice of savings into guaranteed lifetime income for essential expenses.
Key contrasts at a glance
| 401(k) | Annuity | |
|---|---|---|
| Type | Account (holds investments) | Insurance contract |
| Employer match | Often yes | No |
| Growth | Market-based, tax-deferred | Guaranteed (fixed) or index-linked (indexed); market-based in a variable annuity or RILA, which can lose principal; all tax-deferred |
| Longevity protection | None — can run out | Lifetime income option |
| Liquidity | Loans/withdrawals (rules apply) | Limited; surrender charges early on |
| Legacy to heirs | High — full balance passes | Full account value on a deferred contract; none or limited once annuitized (period certain/refund) |
| Backstop if provider fails | Federally regulated, segregated assets | State guaranty association, up to limits |
A worked example: how much income does annuitizing buy?
Numbers make the trade-off concrete. Say you reach 65 with a $600,000 401(k). Your essential, non-negotiable bills — Medicare premiums, property tax, utilities, food — run about $40,000 a year in total.
You roll the 401(k) to an IRA and use $200,000 — one-third — to buy a single-premium immediate annuity (SPIA). At an illustrative life-only payout of roughly 8.4% for a 65-year-old man ($698 a month per $100,000), that buys:
- $200,000 at $698 per $100,000 ≈ $16,800 per year of guaranteed lifetime income — about $1,396 a month.
- The remaining $400,000 stays invested for growth, inflation protection, and heirs.
If Social Security already pays, say, $24,000 a year, the SPIA's $16,800 lifts your guaranteed income to $40,800 — just above the $40,000 floor. The essentials are insured for life. You can then draw from the $400,000 invested balance for travel, gifts, and surprises without fear of running dry on the basics.
The real decision: invested vs. annuitized at retirement
Once you're retired, the genuine choice is whether to keep your 401(k) balance invested or convert part of it into an annuity. Each column below wins on different dimensions — which is exactly why most retirees use both.
| 401(k) invested | Annuity (SPIA after rollover) | |
|---|---|---|
| Income guarantee | None — depends on returns | Yes — for life |
| Inflation protection | Yes — if held in stocks | Only with a COLA rider (lower payout) |
| Legacy potential | High — full balance to heirs | None or limited (period certain/refund) |
| Annual fees | 0.05%–0.50% for index funds | No explicit fee on a SPIA; cost is in the payout factor |
| Sequence-of-returns risk | High in the first decade | None — locked in at purchase |
| Liquidity | Full access | Largely gone once annuitized |
Sequence-of-returns risk is the quiet danger here. A portfolio that takes steep losses in the first few years of withdrawals can run dry decades sooner than the same portfolio hit later. An annuity covering your essentials removes that risk from the part of your budget you can least afford to gamble.
The "barbell" strategy: a guaranteed floor plus an invested portfolio
The strongest approach for many retirees is to refuse the either/or. At retirement, roll your 401(k) to an IRA, then split it:
- Use roughly 20%–40% of the balance to buy a SPIA covering non-negotiable expenses — Medicare, housing costs, utilities, food.
- Keep the remaining 60%–80% invested in a diversified, equity-tilted portfolio for growth, inflation protection, and legacy.
This locks in an income floor that neutralizes sequence risk during the dangerous first decade. It also preserves the upside and heir-friendliness of equities for everything above the floor. The lights stay on no matter what the market does — and you still participate in growth with the rest.
Who an annuity wins for — and who should skip it
Where an annuity genuinely wins
- Longevity insurance — income you cannot outlive, however long you live.
- Sequence-risk protection — payments are locked in regardless of market timing.
- Behavioral simplicity — a guaranteed check removes the stress of managing withdrawals.
Where it costs you
- Illiquidity — once annuitized, that money is generally gone as a lump sum.
- Inflation drag — fixed payments lose purchasing power unless you buy a COLA rider, which lowers the starting payout.
- Lost legacy — a plain life annuity leaves nothing to heirs after death.
- Complexity and fees — variable and indexed annuities can carry layered charges; SPIAs and MYGAs are far simpler.
When to skip the annuity entirely
If your guaranteed income — Social Security plus any pension — already covers your non-negotiable expenses with margin to spare, you don't need to annuitize. You can stay invested, manage drawdown carefully, and leave more to heirs.
Skipping also makes sense if you have strong legacy goals, want maximum liquidity for big unknowns, or are still years from retirement and focused on accumulation. Annuities are insurance against outliving your money; if you don't carry that risk, you don't need the policy. Check your projected benefit at SSA.gov before deciding how big your income gap actually is.
Mistakes to avoid
- Skipping the match to fund an annuity — you give up the single highest-return dollars in your plan.
- Buying an annuity "for the tax deferral" inside an IRA — redundant; the account already defers taxes.
- Annuitizing the whole balance — sacrifices liquidity, growth, and legacy for a guarantee you only needed on essentials.
- Ignoring the insurer's strength — your guarantee is only as good as the company behind it; check ratings and your state guaranty-association coverage limits.
- Taking a check instead of a direct rollover — can trigger mandatory withholding and turn a tax-free move into a taxable one.
