Handing over a $300,000 lump sum in exchange for a guaranteed monthly check sounds like a retirement dream, but the trade-offs buried in the fine print can quietly unravel the deal for the wrong retiree.
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A 70-year-old with a $300,000 rollover balance receives an insurance quote: hand over the lump sum today, and roughly $2,000 a month arrives for life. That’s the promise of a single-premium immediate annuity, or SPIA. The appeal is obvious, but what are retirees giving up?
The first thing to internalize: $2,000 a month on $300,000 works out to an 8% annual payout, but that is not an 8% return. Each check is part interest and part return of your own principal. Current SPIA quotes vary by insurer, gender, and state, so your actual percentage could be different.
For context on why insurers can offer this rate at age 70, the 30-year Treasury yields around 5.2% and the national average 12-month CD sits near 1.7%. The annuity outruns those benchmarks mostly because the insurer blends yield with mortality credits, meaning payments from annuitants who die early subsidize those who live longer.
The Check Never GrowsA fixed SPIA payment is permanent. It does not adjust when groceries or Medicare premiums climb.
By contrast, Social Security adjusts. The 2026 COLA was 2.8%. At roughly 3% annual inflation, $2,000 today buys closer to $1,100 in real purchasing power by age 85. That’s a huge hit.
Here are a few other trade-offs to consider:
Annuities are genuine longevity insurance, and at age 70 the payout math beats a self-built bond ladder for pure income. With 51% of Americans worried they will outlive their savings, transferring that risk to an insurer has real psychological and financial value.
Partial annuitization could be a smart strategy. Annuitize a slice, say $150,000, to cover fixed expenses that Social Security does not, and keep the other $150,000 invested for growth, liquidity, and heirs. That preserves the longevity hedge without surrendering every dollar.
To sanity-check what a self-managed drawdown on the same balance could produce, model it against a conservative withdrawal rate:
A 4% rule draw on $300,000 generates roughly $1,000 a month with the principal still working, versus $2,000 fully annuitized. That gap is the price of guaranteed lifetime income, and whether it is worth paying depends on how long you expect to live and how much liquidity you need along the way.
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