Why Wealthy Couples Are Spending the 401(k) at 63 and Letting Social Security Grow to $5,100 a Month at 70
Spending down a seven-figure retirement account before touching Social Security sounds like financial malpractice, but fee-only planners are quietly steering high-net-worth couples toward exactly that move for one very specific reason buried in the tax code.
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A couple both age 63 with roughly $1.8 million between their 401(k)s is doing something that looks reckless on paper: they plan to spend the retirement account down for the next seven years while leaving Social Security untouched until 70. The math is why this approach has quietly become the default for high-net-worth households working with fee-only planners.
The premise is straightforward. Delaying Social Security from full retirement age at 67 to age 70 raises the monthly check by roughly 8% per year. Over three years, that compounds to a benefit that is roughly 24% higher for life, and every future cost-of-living adjustment is calculated off that larger base. The 2027 COLA is tracking near 3.1%, and future adjustments layer on the same way.
Why the Bridge Beats Claiming Early
Assume this couple would receive a combined $4,100 a month at 67. Waiting to 70 pushes the household benefit to about $5,100 a month, or roughly $61,000 a year in inflation-linked lifetime income. The 10-year Treasury yields almost 5%. No comparable safe asset offers an 8% annual step-up that also survives one spouse and continues for the other.
To fund the gap, they draw the 401(k). At $110,000 a year for seven years, they cover living costs comfortably. The Bureau of Labor Statistics puts average annual household expenditures at $78,535 in 2024, so a six-figure draw leaves room for travel, private health premiums before Medicare, and taxes.
Where the Withdrawal Actually Lands in the Tax Code
Here is where the strategy quietly wins. In 2026, the standard deduction for married couples filing jointly is $32,200. With no Social Security and no wages, a $110,000 401(k) withdrawal leaves taxable income after the standard deduction. The 10% bracket runs to $24,800 and the 12% bracket runs to $100,800 for MFJ. Every dollar of this withdrawal lands in a low bracket.
Compare that to the alternative. If the couple claims at 67 and pushes RMDs to 73, they will eventually stack roughly $61,000 of Social Security on top of forced distributions from a much larger pre-tax balance. Once combined income clears the 22% bracket threshold at $100,800, up to 85% of Social Security becomes taxable and Medicare IRMAA surcharges enter the picture. The effective marginal rate in that zone often lands near 40%.
Spending the 401(k) at 12% today, then collecting Social Security later, beats letting the pre-tax balance grow and withdrawing at 22% or higher with 85% of benefits taxable.
What Shrinking the Pre-Tax Balance Does to RMDs
The bridge strategy also cuts the RMD problem down to size. A $1.8 million pre-tax balance at 73 forces a first-year distribution near $68,000 whether the household needs the cash or not. Drawing $110,000 a year from 63 to 70 removes hundreds of thousands from the RMD base, which lowers every future forced withdrawal and every future IRMAA test.
For couples in this range, spending the 401(k) first also creates room for partial Roth conversions in the same low-bracket window. A conversion that fills the 12% bracket now avoids the 22% or 24% bracket later, and the Roth carries no lifetime RMD for the original owner.
What to Do This Year
- Pull your Social Security statement and calculate the delayed-credit uplift. The delta between claiming at 67 and 70 is roughly 24% plus every intervening COLA. If your household benefit at 67 would be $4,100 a month, the 70 figure is close to $5,100.
- Model a 401(k) drawdown that fills the low bracket without crossing into the next one. For 2026 MFJ, that means keeping taxable income under $100,800 after the standard deduction. Distributions near $130,000 a year fill that space without spilling over.
- Layer Roth conversions on top only if headroom remains. The goal is the smallest possible pre-tax balance at 73, when the RMD table and a larger Social Security check will push every additional dollar into a higher bracket.
Couples running this play trade a smaller nest egg at 70 for a larger, inflation-linked, tax-favored lifetime income stream and a lighter RMD profile at 73. The trade tends to look better the longer either spouse lives, and we condensed the 62 versus 67 versus 70 math into a free one-page framework if you want to run your own numbers.
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