Projected balance at retirement
$1,820,000
~$6,067/mo at the 4% safe-withdrawal rate
Your contributions$420,000
Employer match$126,000
Investment growth$1,274,000
Years to retirement33
Contribution + employer match + decades of compounding. The single most important number for most American retirements.
Among the dozen ways to save for retirement in the US, the 401(k) sits at the top of most priority lists for one reason: the employer match is a guaranteed return on the day of the contribution. No other tradable asset offers that. The honest order of operations for retirement savings, refined over decades by Fidelity, Vanguard, and the Bogleheads consensus, looks like this:
Employee deferral: $24,500. Catch-up (50+): +$8,000. SECURE 2.0 super catch-up (ages 60–63): +$11,250. Combined employer + employee (Section 415): $72,000.
On a 33-year career with $7,200/year contributed, roughly 70% of the final balance is investment growth, not your contributions. Each decade you delay roughly doubles the contribution required to land at the same number — the math behind why "start now" beats every other piece of retirement advice.
| Start age | Total contributed | Balance at 65 | Growth share |
|---|---|---|---|
| 25 | $240,000 | $1,520,000 | 84% |
| 30 | $210,000 | $1,065,000 | 80% |
| 35 | $180,000 | $735,000 | 76% |
| 40 | $150,000 | $495,000 | 70% |
| 45 | $120,000 | $320,000 | 63% |
| 50 | $90,000 | $190,000 | 53% |
| $500/month contribution, 7% annual nominal return, no employer match. "Growth share" is the percentage of the final balance that came from investment returns rather than your own contributions. | |||
By age 30: 1× current salary saved. Age 40: 3×. Age 50: 6×. Age 60: 8×. Age 67: 10×. These multiples assume a 15% gross savings rate (employer match counts) and a portfolio appropriate for the time horizon. Falling short means raising the savings rate, not the expected return.
Traditional 401(k) contributions reduce taxable income today; you owe ordinary income tax on the eventual withdrawal. Roth 401(k) contributions don't reduce taxable income today, but qualified withdrawals (after age 59½ and a 5-year holding period on the account) are entirely tax-free.
| Your situation | Lean |
|---|---|
| Early career, low bracket (12% or 22%) | Roth — pay the low rate now |
| Peak earning years (32%+ bracket) | Traditional — defer to a likely-lower bracket |
| Expect public-sector pension or rental income in retirement | Roth — pension takes up the low bracket space |
| Worried about future federal tax-rate hikes | Roth or 50/50 split |
| Want maximum tax-deferred dollars working | Traditional — same dollars, more pre-tax |
One subtle gotcha: the employer match always goes into the traditional bucket, even if your contributions are Roth (SECURE 2.0 allows Roth match in some plans, but adoption is slow). So unless you're 100% Roth and your employer offers a Roth match, you'll have a mix.
Per the Department of Labor, ~40% of workers cash out their 401(k) when leaving a job. The IRS taxes the distribution as ordinary income and applies a 10% penalty if you're under 59½. A $30,000 cash-out at age 35 in the 24% bracket nets you about $19,800 — and costs you $230,000 in retirement balance compounded over 30 years.
Each decade of delay roughly doubles the monthly contribution required to land at the same retirement balance. Starting at 35 vs 25 means contributing 2× as much for 25 years — to end up with less.
Plan defaults sometimes route contributions to the stable-value or money-market fund. Check your allocation: a 30-year-old should typically be 90%+ in equities. The single biggest portfolio fix most savers make is moving from "default safe" to a low-cost target-date fund or 3-fund mix.
Sources: IRS IRS Notice 2025-67 (2026 contribution limits), Department of Labor ERISA vesting standards, Vanguard "How America Saves" 2024, Fidelity 401(k) Savings Factors, SECURE 2.0 Act of 2022.
Retirement planning interacts with taxes, estate planning, social security claiming strategy, and your own risk tolerance. Confirm plan specifics — match formula, vesting schedule, fund lineup, fee structure — by reading your plan's Summary Plan Description (legally required to be free on request).
Per the IRS, the 2026 employee deferral limit is $24,500. Workers age 50+ add an $8,000 standard catch-up ($32,500 total). Under SECURE 2.0, ages 60–63 get an enhanced catch-up of $11,250 ($35,750 total). The combined employer-plus-employee limit (Section 415) is $72,000, or $80,000 with the standard catch-up.
Traditional contributions are pre-tax (deduction now, taxed on withdrawal). Roth contributions are post-tax (no deduction, but qualified withdrawals are tax-free). Pick based on tax-bracket forecast: if you expect to be in a lower bracket in retirement, traditional. If you expect a higher or uncertain bracket — common for high earners early in their career and for anyone worried about future rate hikes — lean Roth. Splitting 50/50 hedges the bet.
The match is a guaranteed return on the day of the contribution — no other tradable asset comes close. On an $80,000 salary with a 50% match up to 6% of pay, that's $2,400/year in free contributions. Compounded at a real 5% over 33 years (after 7% nominal minus 2% inflation), it's worth roughly $200,000–$330,000 of the final balance. Skipping the match is the single most expensive mistake in personal finance.
Four options under IRS Pub 575 / Pub 590: (1) leave it if balance > $7,000; (2) roll into the new 401(k); (3) roll into a Traditional IRA — best for low-cost index access and consolidation; (4) cash out — usually a mistake (income tax + 10% early-withdrawal penalty if under 59½, plus mandatory 20% federal withholding). Use direct trustee-to-trustee transfers to avoid the 60-day rollover risk.
Your own contributions are always 100% vested immediately. Employer match may follow a vesting schedule under ERISA: most common are 3-year cliff (0% before 3 years, 100% after) or 6-year graded (20% per year starting in year 2). SECURE 2.0 capped maximum schedules at 3-year cliff or 6-year graded. Leaving before fully vested means forfeiting the unvested employer dollars.
Two rules: never below the match cap (free money). Above that, target a total savings rate of 15% of gross income across all retirement vehicles, per Fidelity research. If you can't hit 15% immediately, automate a 1% annual auto-escalation — most plans let you set this once and forget it. The IRS allows up to $24,500 of pre-tax 401(k) plus $7,500 to a Roth IRA in 2026 — that's $32,000 of tax-advantaged space before catch-ups.
If your plan allows after-tax (non-Roth) contributions and either in-plan Roth conversions or in-service distributions, you can fill the entire $72,000 Section 415 limit with Roth dollars by contributing the after-tax portion and immediately converting. Verify two plan features: (1) after-tax contributions allowed beyond the Roth cap, and (2) ability to convert without leaving employment. Most 401(k) plans don't permit it; some big-tech and finance plans do.
Treat it as a last resort. Pros: prime-rate-plus-1% rate, you pay yourself the interest, no credit pull. Cons: borrowed funds aren't invested, you repay with after-tax dollars (double-taxed on the principal portion), and if you leave the employer the loan is typically due in 60–90 days or it converts to a taxable distribution plus 10% penalty under 59½.
A target-date fund (TDF) automatically adjusts allocation as the target year approaches, sliding from equity-heavy in your 30s to bond-heavy near retirement. For most savers it's the right default — it removes behavioral mistakes (panic-selling, market timing). Check three things: (1) expense ratio (under 0.20% is good, over 0.50% is expensive), (2) glide path — equity allocation at the target date varies meaningfully across providers, and (3) underlying funds (index vs active). Vanguard, Fidelity Freedom Index, and Schwab Target Index funds are the low-cost benchmarks.
Self-direct: a Traditional or Roth IRA at any major brokerage gives you $7,500/year ($8,600 if 50+) with no employer involvement. Self-employed? A Solo 401(k) or SEP-IRA scales with income — Solo 401(k) caps at $72,000 in 2026 before catch-up contributions. State auto-IRA programs (CalSavers, OregonSaves, Illinois Secure Choice) cover many private-sector workers whose employers don't sponsor a plan; they default-enroll at 5% with annual auto-escalation.