Annuity vs. 401(k): Key Differences and How to Use Both

Planning for retirement income means making real decisions about where your money lives and how it pays you back. A 401(k) and an annuity both build toward the same goal, but they work differently, protect differently, and pay out differently. Understanding those differences can help you avoid a costly mismatch between what you have and what you actually need in retirement.

Annuity vs. 401(k): The Core Difference

A 401(k) is an employer-sponsored savings account that grows through market investments. An annuity is an insurance contract that converts savings into income, either guaranteed or market-linked. The 401(k) builds wealth. The annuity distributes it.

That distinction matters more than most people realize. Running out of money at age 82 is not a market risk problem. It is an income structure problem. These two products solve different halves of the same retirement challenge.

How a 401(k) Works

A 401(k) lets you contribute pre-tax dollars from your paycheck, up to $23,500 in 2025 (or $31,000 if you are 50 or older, thanks to the $7,500 catch-up limit). Your employer may match a portion of your contributions, which is essentially free money added to your balance.

Inside the account, your money is invested in mutual funds, index funds, or target-date funds. The balance grows tax-deferred, meaning you pay no taxes on gains until you withdraw. Required minimum distributions (RMDs) kick in at age 73, forcing you to start drawing down the account whether you need the money or not.

Take David, age 58. He has $400,000 in his 401(k), split between an S&P 500 index fund and a bond fund. His balance grows with the market, but it can also drop. A 20% correction in his last two years before retirement would cut $80,000 from his nest egg, a sequence-of-returns risk that catches many retirees off guard.

How an Annuity Works in Retirement

An annuity is a contract between you and an insurance company. You hand over a lump sum (or a series of payments), and the insurer promises to return that money as a guaranteed income stream, either for a set period or for the rest of your life.

The most relevant types for retirees are fixed annuities, MYGAs, fixed indexed annuities, and single premium immediate annuities (SPIAs). A multi-year guaranteed annuity (MYGA) works like a CD, locking in a guaranteed rate for 3 to 10 years. A SPIA starts paying income within 30 days of purchase.

Carol, age 64, takes $150,000 from her savings and buys a SPIA. Starting the next month, she receives $875 per month for life, guaranteed, regardless of how the stock market performs or how long she lives. That check does not stop. That predictability is the core value proposition of an annuity.

To understand the full mechanics of annuity income contracts, see our guide on what is an annuity.

Key Differences: Annuity vs. 401(k) Side by Side

Here is how the two products compare across the factors that matter most to retirees.

When Does a 401(k) Win?

The 401(k) is the better tool when your primary goal is accumulating wealth over a long time horizon. If you are 45, still working, and your employer matches 4% of your salary, maxing out the 401(k) first is almost always the right call. That match is an instant 100% return before a single stock price moves.

A 401(k) also wins when you want flexibility. You can invest aggressively or conservatively, change allocations, and take loans in emergencies. For people with 15 or more years until retirement and a high tolerance for market swings, the growth potential of a stock-heavy 401(k) portfolio historically outperforms a fixed annuity over the same period.

Additionally, if your estate is a priority, a 401(k) balance passes directly to named beneficiaries. Annuity death benefits vary by contract and may not pass the full accumulated value.

When Does an Annuity Win?

An annuity wins when your primary concern shifts from growing money to not outliving it. Once you are within five years of retirement, or already in retirement, the risk that hurts most is not a bad market year. It is a bad market year happening right after you retire, when you have no paycheck to cushion the blow.

Fixed annuities and MYGAs offer a guaranteed rate with no downside risk. If you have $200,000 sitting in a savings account earning 0.50% and rates are at 5.30%, moving that money into a 5-year MYGA locks in a significantly better return without any market exposure. The math is simple and the protection is real.

Annuities also win when your other income sources (Social Security, pension, part-time work) do not fully cover your fixed monthly expenses. A SPIA or income rider can fill that gap permanently, which removes the anxiety of watching your portfolio balance and wondering if you are spending too fast.

For a detailed breakdown of when annuity income makes strategic sense, read our article on when to buy an annuity.

Can You Roll a 401(k) Into an Annuity?

Yes. A 401(k) rollover to an annuity is one of the most common retirement planning moves, and it can be done without triggering taxes if handled correctly. When you leave a job or retire, you can roll your 401(k) balance directly into a qualified annuity using a direct rollover, meaning the funds go straight from the 401(k) custodian to the insurance company.

The key is using a direct rollover, not a 60-day rollover. With a direct rollover, your employer sends the check directly to the new custodian and no taxes are withheld. With a 60-day rollover, your employer withholds 20% for taxes, and you have to make up that 20% out of pocket within 60 days to avoid a taxable event.

Margaret, age 63, retires with $350,000 in her 401(k). She rolls $150,000 directly into a 7-year fixed indexed annuity. The remaining $200,000 stays invested in a rollover IRA for growth. The annuity portion is now “qualified money,” meaning withdrawals will be taxed as ordinary income, the same as her 401(k) would have been.

One important note: the SECURE 2.0 Act, signed into law in December 2022, expanded the use of qualifying longevity annuity contracts (QLACs) inside IRAs and 401(k)s. You can now put up to $200,000 (indexed for inflation) into a QLAC, which defers income and RMDs to as late as age 85.

See our full guide on incorporating annuities into your retirement income plan for a step-by-step look at structuring these rollovers.

How to Use Both Together

The most effective retirement income strategies almost always use both a 401(k) and an annuity, rather than choosing one over the other. They complement each other in ways that neither can replicate alone.

A common framework financial planners use is the “income floor” approach. First, identify your non-negotiable monthly expenses: housing, utilities, food, insurance. Then build a guaranteed income floor to cover those expenses using Social Security plus a SPIA or income annuity. Everything above the floor comes from your 401(k) or IRA portfolio.

Here is a practical example. Robert, age 66, receives $2,100 per month from Social Security. His fixed monthly expenses total $3,400. He has a $600,000 rollover IRA from his 401(k). He takes $120,000 from that IRA, rolls it into a SPIA, and receives an additional $630 per month for life. Now his guaranteed income floor is $2,730, closer to his fixed costs. The remaining $480,000 stays invested for growth, travel, and emergencies.

This approach reduces sequence-of-returns risk on the portfolio (because he does not need to sell shares in a down market to pay rent), while keeping money growing for long-term needs and estate planning.

You can also use a MYGA as a “bridge” strategy. If you retire at 62 but plan to delay Social Security until 70, a 5-year or 7-year MYGA can generate a guaranteed return while you wait, reducing the need to draw down your 401(k) in your early retirement years.

For a full framework on building retirement income, see our guide on annuities in a retirement income plan.

Tax treatment matters here too. Annuity withdrawals from non-qualified contracts use the exclusion ratio to determine the taxable portion, while qualified annuities (funded with pre-tax 401(k) money) are fully taxable as ordinary income. See our full breakdown on how annuities are taxed before making any rollover decisions.

Frequently Asked Questions

Is it better to put money in an annuity or a 401(k)?

It depends on your stage of life and goal. If you are still working with an employer match available, max out your 401(k) first. If you are near or in retirement and need guaranteed income to cover fixed expenses, an annuity may be the better tool for that portion of your savings. Most retirees benefit from using both.

Can I lose money in a 401(k) but not an annuity?

Yes. A 401(k) invested in market funds can decline in value. A fixed annuity or MYGA cannot lose principal due to market performance. Fixed indexed annuities protect principal while offering limited upside linked to an index. Variable annuities do carry market risk, similar to a 401(k).

What happens to my 401(k) if I die before retirement?

Your 401(k) balance passes to your named beneficiary. A surviving spouse can roll it into their own IRA or take distributions. Non-spouse beneficiaries must generally empty the account within 10 years under the SECURE Act rules. Annuity death benefits vary by contract – some return the premium, others pay the accumulated value.

How much of my 401(k) should I convert to an annuity?

A common guideline is to annuitize enough to cover the gap between your fixed monthly expenses and your guaranteed income sources (Social Security, pension). For most retirees, that means converting 20% to 40% of their retirement savings into an income annuity. Keep the rest invested for growth and liquidity. A fee-only fiduciary advisor can help you find the right percentage for your situation.

Related Reading

• What Is an Annuity? A Complete Guide – Learn how annuities work before deciding whether one belongs in your retirement plan.
• What Is a MYGA (Multi-Year Guaranteed Annuity)? – The fixed annuity alternative to CDs, with higher rates and full principal protection.
• How to Use Annuities in Your Retirement Income Plan – A step-by-step framework for building guaranteed income alongside a portfolio.
• When Is the Right Time to Buy an Annuity? – Age, market conditions, and income needs all factor into timing.
• How Are Annuities Taxed? – Understand the tax differences between qualified and non-qualified annuity contracts.

Sources & Citations

1. IRS: 401(k) Plans – Contribution Limits and Rules – Official IRS guidance on contribution limits, catch-up contributions, and rollover rules for 401(k) accounts.
2. IRS: Required Minimum Distributions (RMDs) – IRS rules governing RMD requirements for IRAs and 401(k)s, including the SECURE 2.0 Act changes effective 2023.
3. U.S. Department of Labor: 401(k) Plan Rollovers FAQ – DOL guidance on how to execute tax-free direct rollovers from 401(k)s into annuities or IRAs.
4. FINRA: Annuities – Investor Education – FINRA’s overview of annuity types, surrender charges, fees, and questions to ask before buying.
5. Social Security Administration: Retirement Benefits (Publication No. 05-10035) – SSA publication on how retirement benefits are calculated and how delaying benefits increases your monthly payment.