The size of the gap#
Vanguard’s data on this is stark. Employees who were automatically enrolled had a 94% participation rate in 2025. Employees who had to sign themselves up: 64%. Thirty percentage points, from a default.
Once you fold participation into the totals, workers in auto-enrolment plans saved an average of 12.3% of pay including the employer contribution, against 7.4% in voluntary plans.
Here’s the part I find most telling. The deferral rates of the two groups have nearly converged — 7.7% for auto-enrolled versus 7.5% for voluntary in 2025, down from a gap of almost two percentage points in 2013. So the people who opt in aren’t saving meaningfully harder than the people who were opted in. Almost the entire difference is whether they’re in the plan at all.
That’s not a story about discipline. It’s a story about a form.
Why the default beats you#
The behavioural explanation is unflattering and worth sitting with, because it describes most of us.
Three separate traits sink voluntary enrolment: not being able to plan far enough ahead to value a distant benefit, freezing when presented with a complicated menu of fund choices, and plain procrastination. Any one is enough. Many people have all three.
What’s elegant about a default is that it neutralises all three simultaneously without the person changing at all. No new knowledge, no new virtue. The complicated decision gets made once by someone else, in a direction that’s usually right, and inertia — the exact force that was working against you — now works for you.
Which suggests a general principle: anywhere in your finances you’re relying on repeatedly making a good decision, replace it with a default. Automatic contribution increases tied to raises are the highest-value version. Set it once and the awkward annual choice never comes up again.
The balances, and how to read them#
The Vanguard figures by age, average and median:
| Age | Average | Median |
|---|---|---|
| Under 25 | $7,259 | $2,234 |
| 25–34 | $50,261 | $18,732 |
| 35–44 | $120,000 | $46,919 |
| 45–54 | $214,991 | $78,730 |
| 55–64 | $305,006 | $107,269 |
| 65+ | $330,186 | $103,202 |
Use the median column. Averages in this data are dragged upward by high earners maxing out, and they run roughly three to four times the median in every bracket. Comparing yourself to an average here will make you feel worse than the facts warrant.
Against Fidelity’s guideline of 10× salary by 65, a median 55–64 balance of $107,269 looks catastrophic. Before you panic, two corrections.
These are 401(k) balances only. No IRAs, no taxable brokerage accounts, no home equity, no spouse’s savings. For most households the 401(k) is a fraction of the picture.
And the 10× multiple assumes your portfolio replaces your entire income. It doesn’t have to. Social Security averages around $2,000 a month, so the portfolio only bridges the gap between that and what you actually spend. The honest anchor is your own annual spend times 25 — the 4% rule. Spend $50,000 a year and you need about $1.25M, less whatever Social Security covers.
The situation is serious. It is not as apocalyptic as the raw comparison implies, and overstating it mostly makes people give up.
The leaks that undo the defaults#
Two behaviours quietly cancel out years of automated saving.
Cashing out at a job change. Roughly 51% of people in their 20s and 43% in their 30s take the money when they leave. This is the single most destructive move available, because it hits the balance with the longest runway. $50,000 left alone at 25 becomes about $1.086M by 65. The same $50,000 starting at 34 becomes about $543,000. Nine years costs you half the outcome — and cashing out costs you all of it, plus tax and a 10% penalty.
Borrowing against the account. About 13% of participants have a loan outstanding. The trap isn’t the loan, it’s the job change: leave or get laid off with a balance owing and it can convert into a withdrawal, with income tax and the penalty attached, at the exact moment you’re least able to absorb it. Borrow from almost anything else first.
If you’re over 50#
Two 2026 specifics worth knowing. Standard 401(k) contributions cap at $24,500, with an $8,000 catch-up from 50 taking you to $32,500, and a “super catch-up” of $11,250 for ages 60–63 only — a four-year window most people don’t know exists.
And a new rule with teeth: if you earned over $150,000 in the prior calendar year, all catch-up contributions must now go in as Roth, in after-tax dollars. You lose the upfront deduction. Worth planning for rather than discovering in January.
So what to actually do#
- Confirm you’re enrolled and capturing the full employer match today. Not this month. Today.
- Switch on automatic contribution increases so every raise lifts the rate without a decision.
- Benchmark against the median for your age, not the average, then against your own spend × 25.
- Never cash out on a job change — roll it over, even when the balance feels too small to bother with.
- If you’re 60–63, check the super catch-up, and if you earn over $150K, plan for catch-ups being Roth-only.
Sources & further reading#
- The power of 401(k) auto-solutions to drive participation rates to all-time highs — BenefitsPro on Vanguard’s How America Saves — the 94% vs 64% participation gap and the 12.3% vs 7.4% total savings rates.
- Plan design drives record retirement participation — NAPA — the convergence of deferral rates between auto and voluntary enrollees.
- Automatic enrollment has sent participation rates soaring — PSCA — corroborating industry data on the default effect.
