The Average 401(k) Is $167,970. The 4% Rule Turns That Into $560 a Month. Social Security Pays $2,081.
Most workers assume their 401(k) will carry its share of retirement, but the math behind the most popular withdrawal rule tells a very different story about who is actually footing the bill.
This post may contain links from our sponsors and affiliates, and Flywheel Publishing may receive compensation for actions taken through them.
Three numbers frame the American retirement picture, and they do not tell the story most people think. The average 401(k) balance is $167,970. Applied to the classic 4% withdrawal rule, that produces roughly $560 a month in year one. The average Social Security retirement benefit is $2,081, per the Social Security Administration. For most workers, the check from Washington is the retirement plan. The work-life balance is the supplement.
Why the Average Balance Misleads
Vanguard’s How America Saves 2026 report indicates that the average account balance for its participants was $167,970 in 2025, while the median was $44,115. Both climbed sharply from the prior year, up 13% and 16% respectively, helped by a 19.3% one-year participant return. The mean, or arithmetic average, adds every balance and divides by the number of accounts. The median is the middle value: half of participants have more, half have less.
The gap is enormous because a small number of very large accounts pull the average upward. Vanguard states this plainly: the average represents roughly the 75th percentile, meaning about three in four participants have less than the mean. One in four accounts holds less than $10,000, while 18% hold $250,000 or more. When commentators cite “the average 401(k),” they are describing balances above what most workers actually have.
Age Skews the Picture Further
The all-ages averages lump together 25-year-olds who just signed up with 60-year-olds who are staring down retirement. Vanguard itself notes that average balances tend to reflect longer-tenured, more affluent, or older participants. But for a discussion about retirement income, only the balances at retirement age really matter, and those numbers for typical near-retirees sit well below the headline average. The distribution tells the real story. A full 26% of accounts hold less than $10,000, and only 35% clear the $100,000 mark. A defined contribution plan like a 401(k) or 403(b) is only as strong as what the worker put in over the years.
What the 4% Rule Actually Says
The 4% rule comes from a 1994 study by financial planner William Bengen, who examined historical U.S. market returns to ask how much a retiree could withdraw in the first year, then adjust for inflation annually, without running out of money over 30 years. His model assumed a portfolio of roughly 50% to 75% stocks and the rest in bonds, and it excluded taxes and fees. Bengen and later researchers have revised the figure in both directions depending on valuations, bond yields, and time horizon.
It is a planning heuristic. It does not protect against sequence-of-returns risk, the danger that a market decline early in retirement permanently damages a portfolio because withdrawals compound the losses. Applied to a $167,970 balance, the rule points to roughly $560 a month in the first year, pending inflation adjustments (we made the full case for why that heuristic wobbles now, and what income-first approach to run instead, in a free report here).
[withdrawal-rate portfolio_value=167970 withdrawal_rate=4 rate=5 time=30]
Social Security Is the Plan
The Social Security Administration reports the average retired-worker benefit at roughly $2,081 a month. That figure dwarfs what a typical workplace balance produces under any reasonable withdrawal rule. For a retiree with the median $44,115 balance, the 4% rule delivers a small fraction of what Social Security pays. The 2027 cost-of-living adjustment is currently tracking at 3.1% based on one of the three Q3 inflation readings that determine the annual increase.
This reframes the entire conversation. For most Americans, Social Security is the base, and the 401(k) is the top-up. The Bureau of Labor Statistics puts average annual household expenditures at $78,535 in 2024. Neither source of retirement income covers that alone.
Three Decisions That Carry More Weight Than Fund Selection
Given the math, a few choices matter more than almost any investment decision:
- Claiming age. Delaying Social Security past full retirement age permanently increases the monthly benefit, up to age 70. Because the benefit is lifetime and inflation-adjusted, the increase compounds every year of retirement.
- Survivor benefits. For married couples, the higher earner’s claiming decision sets the surviving spouse’s benefit floor. Claiming early can reduce what the survivor receives for the rest of their life.
- Pre-tax withdrawals. Money pulled from a traditional 401(k) is taxed as ordinary income, so the spendable amount is lower than the gross withdrawal suggests. Traditional account withdrawals also count toward provisional income, which can push a portion of Social Security benefits into taxation.
The headline average looks reassuring. The median, the age skew, and the actual mechanics of the 4% rule show why the check from Social Security carries more of the load than most workers realize.
Contact [email protected] for any questions or corrections.
David Beren has been a Flywheel Publishing contributor since 2022. Writing for 24/7 Wall St. since 2023, David loves to write about topics of all shapes and sizes. As a technology expert, David focuses heavily on consumer electronics brands, automobiles, and general technology. He has previously written for LifeWire, formerly About.com. As a part-time freelance writer, David’s “day job” has been working on and leading social media for multiple Fortune 100 brands. David loves the flexibility of this field and its ability to reach customers exactly where they like to spend their time. Additionally, David previously published his own blog, TmoNews.com, which reached 3 million readers in its first year. In addition to freelance and social media work, David loves to spend time with his family and children and relive the glory days of video game consoles by playing any retro game console he can get his hands on.
