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Using a $900,000 401(k) at 62 to Boost Social Security by Nearly $190,000: Why Some Retirees Spend Down First

Digilifetrends Published 4 min read

Emptying a 401(k) before starting Social Security may seem backwards, but for a 62-year-old with $900,000 saved, the sequence can affect taxes, Medicare premiums, and the outcome at age 80.

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A 62-year-old holding $900,000 in a traditional 401(k) plans to live off savings and wait until 70 to claim Social Security. The idea is to reduce the account before required minimum distributions, or RMDs, begin and to secure a larger monthly benefit later. A similar question has been circulating on Reddit’s r/retirement forum, where one retiree asked whether to take Social Security a little early or draw down a 401(k) first.

The two strategies lead to very different results between 62 and 80. In this example, postponing Social Security produces a larger check and lower taxes, but it also leaves less money in the 401(k) at age 80.

Same Savings, Same Spending, Two Different Claiming Ages

Both scenarios use the same assumptions:

  1. The saver is a single filer under projected rules, with a $16,100 standard deduction and the 22% bracket beginning above $50,400. The extra standard deduction available after 65 is left out, so the tax estimates are only approximate.
  2. Annual spending is $70,000 after federal tax, in current dollars. Tax brackets and benefits rise with inflation, so the figures remain flat in real terms.
  3. The 401(k) earns a 4% annual real return, and withdrawals are made at the end of each year.
  4. The example assumes a $3,000 monthly benefit at full retirement age of 67. Claiming at 62 reduces that to 70%, or $2,100. Waiting until 70 increases it by 24%, to $3,720.
Annual figuresDelay to 70Claim at 62
401(k) withdrawal, 62 to 69$78,423$52,157
401(k) withdrawal, 70 to 79$28,957$52,157
Federal tax, 62 to 69$8,423$7,357
Federal tax, 70 to 79$3,597$7,357
Social Security$0, then $44,640$25,200
401(k) balance at 80$405,939$485,647

How the Nearly $190,000 Difference Is Calculated

From 70 through 79, the larger benefit pays $1,620 more each month, which adds up to $194,400 in extra benefits. That is the gross headline number. But the early claimant has already collected $201,600 before reaching 70. Total benefits through age 80 come to $446,400 for the delayed claimant and $453,600 for the early claimant.

The Tax Math Works in Favor of Delaying

Across the 18-year span, the delayed claimant pays $103,354 in federal taxes, while the early claimant pays $132,426. That is a savings of $29,072.

The early claimant has 85% of Social Security taxed each year and remains in the 22% bracket throughout the full period. The delayed claimant also pays 22% during the bridge years, when there is no benefit income. After 70, the smaller withdrawals keep him in the 12% bracket even though part of the larger benefit becomes taxable.

Neither approach triggers IRMAA. The delayed claimant’s income peaks at $78,423, which is well below the $109,000 single-filer threshold.

Why the Early Claimant Still Ends Up Ahead at 80

The delayed claimant withdraws the most from the 401(k) in his 60s, when those dollars would otherwise have had the longest time to grow. By 70, the account has fallen to $509,105. By 80, he is behind by $79,708 before taxes on future withdrawals.

RMDs do not become the deciding factor at this balance. At 75, required withdrawals are about $18,803 and $25,665, both lower than what either strategy already takes out. Because the delayed claimant withdraws $23,200 less each year after 70, he closes the gap by about age 84.

When Spending Down the 401(k) First Makes Sense

Using the 401(k) first can function like longevity insurance. It trades some wealth at 80 for a higher guaranteed income stream for life. That can be worthwhile if you expect to live past your mid-80s, if you are the higher earner in a marriage and want to maximize the survivor benefit, or if your account is large enough that RMDs could push you into IRMAA surcharges.

  1. Review your Social Security statement and calculate your own 70% and 124% figures. Multiply the monthly difference by 120 to estimate the 70-to-80 value, then subtract the benefits you would receive before 70.
  2. Use the bridge-year cushion. The delayed claimant has $30,577 of room below the projected IRMAA threshold for Roth conversions. Future thresholds will differ, and income at 63 generally affects premiums at 65.
  3. Rework the crossover using a lower return assumption. Weaker returns reduce the compounding sacrificed by delaying, which brings the break-even age earlier.

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