What the Average Boomer’s $270,800 401(k) Really Pays Each Month

Many Boomers look at Fidelity’s average 401(k) balance with either relief or alarm, but both reactions miss the more important question: how much monthly income that balance can actually generate after retirement begins.

Most articles may include links from sponsors and affiliates, and Flywheel Publishing may be compensated for actions taken through them.

Fidelity’s latest 401(k) figures show that Boomers have an average balance of $270,800. Some readers may see that number and feel encouraged, while others may feel discouraged because they are nowhere close. But the headline balance is less useful than the monthly payout it can support once work income ends. That monthly amount is much smaller than the lump sum suggests.

Why $270,800 Is Higher Than the Typical Account

In Fidelity’s latest quarterly report, Boomers average $270,800, Gen X averages $222,100, and all savers average $146,400. These are mean values, so large balances push the average upward. For example, if nine savers each have $50,000 and one saver has $2 million, the average becomes $245,000 even though most of the group has far less than that.

Fidelity does not provide a median balance, which would show the saver in the middle of the distribution. Vanguard does. In its How America Saves 2025 report, savers age 65 and older had an average balance of $299,442, but the median was only $95,425. Both numbers cover just one account on one platform, leaving out IRAs, old 401(k) plans from prior employers, and a spouse’s savings.

What the Balance Can Produce Under Three Approaches

Assume a single retiree starts at age 67, uses only pre-tax savings, and chooses one of the following methods. Each trades monthly income for how long the money lasts.

• The 4% rule: Withdraw 4% of the starting balance in the first year, then raise that amount with inflation each year after. That equals $10,832 a year, or about $903 a month.
• Annuity-style withdrawal: Spend the account down to zero by age 93, the planning age Fidelity uses in its savings guidance, while earning the current 10-year Treasury yield of 4.99%. That would pay about $1,541 a month, but no money would remain at the end, and the yield is not guaranteed.
• Interest only: Keep the funds in a vehicle earning the national average 12-month CD rate of 1.76%. That would generate about $397 a month while preserving the principal.

Adding Social Security and Subtracting Medicare

After the 2.8% cost-of-living increase, the average retired worker receives $2,071 a month. Combined with a 4% withdrawal, that comes to roughly $2,974. Medicare then reduces that amount: the standard Part B premium is $202.90 and is usually deducted directly from the Social Security check, leaving about $2,771. Using the annuity-style withdrawal, the same calculation comes to about $3,409.

Taxes are the next adjustment. Under 26 U.S.C. § 402(a), distributions from a traditional 401(k) are taxed like wages when withdrawn. Qualified Roth distributions are different, because § 402A(d)(1) excludes them from taxable income.

At the 4% withdrawal rate, 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 benefit is taxed. The withdrawal amount is also below the 2026 standard deduction of $16,100. Federal income tax would likely be zero, though combined income at that point reaches about $31,038 under the annuity-style approach, which would make part of the Social Security benefit taxable.

Four Ways to Improve the Monthly Number

Delaying Social Security has the biggest impact. For people born in 1943 or later, benefits rise 8.0% for each year they wait beyond full retirement age, up to age 70. Applied to the average benefit, that would increase it to about $2,568 a month at age 70.

Working longer can help as well. Boomers on Fidelity’s platform save 12.1% of pay and receive another 5.0% from employers. Staying employed adds to the balance while shortening the number of years the savings must cover. Owning a home outright can stretch income further too, since housing is often the largest monthly expense. A spouse can also change the numbers: an older couple in which both people receive benefits averages $3,208 a month in combined Social Security.

The Most Useful Benchmark

Using the 4% rule, the average Boomer 401(k) produces about $903 a month. That can help cover groceries, utilities, or occasional travel, but it will not replace a paycheck. The same formula applies to any balance: multiply by 4% and divide by 12. If Vanguard’s median balance for savers 65 and older is run through that calculation, it comes to about $318 a month. For most retirees, Social Security still carries the bulk of the load, while $903 is the kind of monthly addition a well-funded Boomer account can provide on top of it.