How much will your 401(k) be worth at retirement?

The most powerful retirement tool you have

A 401(k) does three things at once that almost no other investment can: it lowers your current taxes, it grows tax-deferred for decades, and (if your employer matches) it gives you free money. The combination is so favorable that financial planners universally agree on this rule:

2026 contribution limits

The IRS adjusts contribution limits annually for inflation. Here’s where they sit for 2026 (Notice 2025-67):

• Employee deferral (under 50): $24,500/year, up from $23,500 in 2025
• Catch-up contribution (50-59 or 64+): Additional $8,000 — total $32,500
• “Super” catch-up (ages 60-63): Additional $11,250 — total $35,750
• Combined employee + employer max: $72,000/year ($80,000 for 50+, $83,500 for 60-63)
• IRA contribution: $7,500 ($8,600 for 50+)

The new 2026 Roth catch-up rule

Starting in 2026, if you earned more than $150,000 in FICA wages last year, your catch-up contributions must go into a Roth 401(k) — not pre-tax. This means high earners over 50 lose the immediate tax deduction on their catch-up contributions but get tax-free withdrawals in retirement.

If your employer’s plan doesn’t offer a Roth option, high earners cannot make catch-up contributions at all in 2026. If you fall into this bucket, ask HR if your plan offers Roth contributions before the end of the year.

How compounding turns small contributions into big wealth

The reason 401(k)s work isn’t just the contribution limits — it’s the math of compounding over 30+ years. Consider two savers, both contributing $5,000/year at a 7% return:

• Sarah starts at age 25 and stops at 35. Total contributed: $50,000 over 10 years.
• Mike starts at age 35 and contributes until 65. Total contributed: $150,000 over 30 years.

At age 65, who has more? Sarah does — by about $40,000. She contributed only one-third as much, but her 30 years of growth on those early dollars beat Mike’s late start. This is the math that makes 401(k)s the single best retirement vehicle most people have access to.

Your match formulas: which is “average”?

Match formulas vary by employer. The most common structures:

• 50% up to 6%: Employer matches half of what you put in, up to 6% of your salary. Maxing this means you contribute 6%, employer adds 3%, total 9% of salary going in.
• 100% up to 4%: Dollar-for-dollar match on the first 4% of your salary. Maxing this means you contribute 4%, employer adds 4%, total 8% of salary.
• Tiered: “100% on the first 3%, 50% on the next 2%” — common at larger employers. Max out the full 5% to capture the full effective 4% match.

According to Bureau of Labor Statistics data, the average employer match in 2026 is 4-6% of compensation. Anything above 5% is considered strong.

Pre-tax (traditional) vs. Roth 401(k): which to pick?

Both reduce your retirement burden, but they tax your money at different times:

Traditional 401(k)

Contributions reduce your taxable income now. You pay income tax on withdrawals in retirement. Best if you expect to be in a lower tax bracket in retirement than you are now (most people).

Roth 401(k)

You pay tax on contributions now, but withdrawals in retirement are completely tax-free. Best if you expect to be in a higher tax bracket in retirement, are early in your career, or want tax diversification.

Many financial planners recommend splitting contributions — some traditional, some Roth — to hedge against future tax rate uncertainty. If you’re earning under $80k as a single filer, lean toward Roth; if you’re earning over $200k, lean toward traditional.

What if you can’t afford to save 10%?

Start where you can. Even 1% is better than nothing. Then commit to increasing your contribution by 1% every year, ideally tied to your annual raise — that way your take-home pay never goes down. By year 10, you’re saving 10%+ without ever feeling pinched.

Most 401(k) plan platforms (Fidelity, Vanguard, Empower, Principal) let you set up automatic annual contribution increases. Find that setting today. It’s the closest thing to retirement on autopilot.