He Put Half His 401(k) Into an Annuity at 68. The $2,400 Monthly Check Is Guaranteed. So Is the Tax Bill Nobody Mentioned.
A guaranteed lifetime income stream sounds like the end of financial anxiety in retirement, but the contract that delivers that monthly check stays silent about the cascading tax consequences waiting on the other side.
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The pitch is straightforward: a 68-year-old rolls half of his 401(k) into a single premium immediate annuity and locks in $2,400 a month for life. The insurance company sends the check on the same day every month, and it keeps coming whether markets rise or fall.
What the sales illustration usually leaves out is that every dollar of that payment lands on the tax return as ordinary income, and the second-order effects on Medicare premiums and Social Security taxation can be larger than the sticker tax itself.
Where the money comes from is what matters here. A 401(k) gets funded with pre-tax contributions, which means the IRS has a claim on every dollar that eventually comes out. When those dollars go toward a “qualified” annuity, the tax deferral just carries over rather than disappearing.
There is no return-of-principal exclusion, no favorable capital gains treatment, and no basis to recover first. The full $2,400 monthly check, or $28,800 a year, is added to Social Security and any other income for the year.
Why the Payout Looks Attractive Right Now
Fixed annuity payouts move with prevailing interest rates, and the current backdrop is doing the work. The 10-year Treasury yield sits at 4.75% as of July 31, 2026, near the top of its 12-month range. The Federal Funds target upper bound has held at 3.75% since December 11, 2025, following the Fed’s 0.75% rate cuts over the past year.
Insurers use long-dated bond yields to price lifetime income, so today’s guarantees are richer than they were during the low-rate stretch of the last decade.
The Tax Bill Nobody Mentioned
Taxes do not stop with ordinary income. Adding $28,800 to a retiree’s return typically pulls more Social Security benefits into the taxable column as well. Under current federal rules, up to 85% of those benefits become taxable once combined income passes $34,000 for a single filer, and the annuity payment alone is enough to cross that line for most retirees.
The average per capita disposable income of $68,958 in the second quarter of 2026 shows the ceiling most households are working with, and an extra $2,400 a month shifts that equation in a meaningful way.
The second layer is Medicare. IRMAA surcharges on Part B and Part D are set from modified adjusted gross income two years earlier, so a full year of annuity payments in 2026 can raise Medicare premiums in 2028. The surcharge tiers are cliffs rather than gradients, meaning one dollar over a threshold can add hundreds of dollars in annual premium costs. Neither effect appears on the annuity contract.
Inflation Is the Quieter Cost
The $2,400 check is a nominal figure rather than a real one. The Consumer Price Index climbed from 308.417 in January 2024 to 333.952 in June 2026, and the Fed’s preferred measure, Core PCE, has drifted from 126.714 in August 2025 to 130.266 in June 2026.
Social Security is indexed to that pressure through the 2.8% cost-of-living adjustment for 2026. A level-pay annuity has no such adjustment, so the purchasing power of that $2,400 falls each year the retiree lives.
Average annual household expenditures reached $78,535 in 2024, up from $72,973 in 2022. Against that spending base, $28,800 of pre-tax annuity income covers a shrinking share each year, while the tax obligation on that income stays proportional to the payment.
What This Changes for the Decision
The guaranteed check is real, and lifetime income has a role in retirement planning that a bond ladder cannot replicate. An alternative use of the same dollars is worth considering.
I-bonds issued between May 1, 2026 and October 31, 2026 carry a composite rate of 4.26%, with federal tax deferred until redemption. That is a different product with different constraints, but it illustrates that guaranteed income and guaranteed-return products are taxed on very different schedules.
Two adjustments tend to reduce the surprise. The first is running a projected tax return before signing, including the Social Security inclusion calculation and the IRMAA lookback.
The second is splitting the annuity purchase between qualified and non-qualified money when possible, since payments funded from after-tax dollars use an exclusion ratio that returns basis tax-free over the life expectancy assumed by the contract. The $2,400 check remains constant, while the amount deposited into the checking account varies.
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David Beren has been a Flywheel Publishing contributor since 2022. Writing for 24/7 Wall St. since 2023, David loves to write about topics of all shapes and sizes. As a technology expert, David focuses heavily on consumer electronics brands, automobiles, and general technology. He has previously written for LifeWire, formerly About.com. As a part-time freelance writer, David’s “day job” has been working on and leading social media for multiple Fortune 100 brands. David loves the flexibility of this field and its ability to reach customers exactly where they like to spend their time. Additionally, David previously published his own blog, TmoNews.com, which reached 3 million readers in its first year. In addition to freelance and social media work, David loves to spend time with his family and children and relive the glory days of video game consoles by playing any retro game console he can get his hands on.
