Fidelity Says the Typical Boomer Has $270,800 in a 401(k). What That Really Means as Monthly Income

Quick Read

• The average Boomer 401(k) balance of $270,800 produces only about $903 a month under the 4% withdrawal rule.

• After adding the average Social Security benefit and subtracting Medicare Part B, a single retiree is left with roughly $2,771 a month.

• Waiting until age 70 to claim Social Security can increase benefits by 8% a year beyond full retirement age, lifting the average monthly check to about $2,568.

Fidelity's latest 401(k) figures put the average Boomer balance at $270,800. Some people see that number and feel reassured; others worry they are far behind. But the more practical question is what that savings level actually translates to once paychecks end. On a monthly basis, the answer is much smaller than the headline balance suggests.

Why $270,800 Is Above the Typical Account

Fidelity's Q4 2025 report shows Boomers with an average balance of $270,800, compared with $222,100 for Gen X and $146,400 across all savers. These are averages, and large accounts can pull the number up. If nine savers each hold $50,000 and one saver has $2 million, the average jumps to $245,000 even though most people are well below that level.

Fidelity does not release a median figure, which would show the balance of the saver in the middle. Vanguard does. In its How America Saves 2025 report, participants age 65 and older had an average balance of $299,442 but a median of only $95,425. Both numbers reflect just one account on one platform, leaving out IRAs, old workplace plans, and a spouse's assets.

What the Balance Pays Under Three Approaches

Assume a single retiree begins at 67 with all pre-tax money. Each approach below trades off monthly income against how long the savings last.

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• The 4% rule: Withdraw 4% of the starting balance in the first year, then increase that amount for inflation each year after. On $270,800, that works out to $10,832 a year, or about $903 a month.

Adding Social Security and Subtracting Medicare

After the latest cost-of-living increase, the average retired worker receives $2,071 a month. Combined with the 4% withdrawal, that comes to about $2,974. Medicare then reduces the total: the standard Part B premium is $202.90 and is usually deducted directly from the Social Security check, leaving about $2,771. Under the withdrawal approach, the same math produces about $3,409.

Taxes are the next factor affecting that monthly amount. Under 26 U.S.C. § 402(a), distributions from a traditional 401(k) are taxed like wages when withdrawn. Qualified Roth withdrawals are treated differently, since § 402A(d)(1) excludes them from taxable income.

At the 4% pace, a single filer's combined income — withdrawals plus half of Social Security — comes to $23,258. That is below the $25,000 base amount in § 86(c)(1)(A), so none of the Social Security is taxed. In addition, the withdrawal is below the 2026 standard deduction of $16,100. Federal income tax is likely zero, so this withdrawal method leaves combined income at about $31,038, at which point part of the Social Security benefit becomes taxable.

Four Ways to Lift the Monthly Total

Delaying Social Security has the biggest effect. For people born in 1943 or later, benefits rise 8.0% for each year claimed after full retirement age, up to age 70. Applied to the average check, that would lift it to about $2,568 at 70.

Working longer can also help. Boomers on Fidelity's platform save 12.1% of pay and receive another 5.0% from employers. More years of work add to the account and shorten the retirement period the money must cover. Owning a home outright also stretches the budget by removing the largest monthly expense. A spouse matters too: an older couple in which both partners collect benefits receives an average of $3,208 a month combined.

One Benchmark Worth Watching

Under the 4% rule, the average Boomer 401(k) generates about $903 a month. That may cover groceries, utilities, and maybe some travel, but it will not replace a paycheck. The same formula applies to any balance: multiply by 4% and divide by 12. Using Vanguard's median balance for savers age 65 and older, that comes to roughly $318 a month. For most retirees, Social Security still does the heavy lifting, and $903 is the extra income a well-funded Boomer account adds on top of it.

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One investing mistake can create major risks for retirement. Many investors make the same costly errors: being too cautious, making oversized bets on supposed sure things, or paying too much in fees. Any of those missteps can put hard-earned savings at risk.

Now you can learn the mistakes even experienced investors make, along with ways to avoid them before it is too late, with this new guide: 13 Retirement Mistakes and How to Avoid Them from Fisher Investments. (sponsor)