How a 401(k) Reduces Your Taxes Right Now

A traditional (pre-tax) 401(k) contribution is deducted from your paycheck before federal and state income taxes are calculated. If you earn $80,000 and contribute $10,000, you're only taxed on $70,000. At a 22% marginal federal rate and 5% state rate, that $10,000 contribution saves you $2,700 in taxes immediately — while the money is still working for you in investments. You don't lose the money; you defer the tax until retirement.

2026 Contribution Limits

Employee elective deferral limit: $23,500 per year. Catch-up contribution (age 50–59 and 64+): Additional $7,500, for a total of $31,000. Enhanced catch-up (ages 60–63): Additional $11,250 (a new provision under SECURE 2.0), for a total of $34,750. Combined employer + employee limit: $70,000 (or 100% of compensation if lower). These limits apply per individual, not per plan — if you have multiple 401(k) accounts from different jobs, your combined employee contributions across all plans cannot exceed $23,500.

The Employer Match — Never Leave It Behind

Employer matching is free money. A common structure is "100% of your first 3%" or "50% of your first 6%" — both equal 3% of your salary in employer contributions, but only if you contribute enough to unlock the full match. Always contribute at least enough to capture your full employer match before considering any other investment account. An employer match is an immediate 50–100% return on your investment before any market gains.

Vesting schedules: Some employer match contributions are subject to a vesting schedule — you only keep them if you stay employed for a certain period. Cliff vesting might require 3 years of service; graded vesting gives you 20%/year over 5 years. Check your plan documents before assuming a match is fully yours.

Traditional vs. Roth 401(k)

Both account types grow tax-free while invested. The difference is timing: Traditional 401(k) contributions are pre-tax (you get the tax break now, pay taxes on withdrawals in retirement). Roth 401(k) contributions are post-tax (you pay taxes now, withdrawals in retirement are completely tax-free including earnings).

Roth is better if you expect your tax rate in retirement to be higher than today — common for young, early-career earners. Traditional is better if you expect lower rates in retirement. If you're unsure, splitting contributions between both hedges your bet. Many plans now allow any combination.

The Compounding Argument

$500/month contributed at a 7% average annual return grows to approximately $1.2 million over 40 years. The same amount started 10 years later reaches only ~$566,000 — less than half — despite contributing only 25% fewer total dollars. Time in the market matters more than the amount contributed. Starting a 401(k) contribution in your 20s, even a small one, is almost always better than waiting.

What Happens When You Leave a Job

Your 401(k) balance is yours to keep — you can leave it with the former employer's plan (if allowed), roll it over to your new employer's plan, or roll it to an IRA. A direct rollover avoids taxes and penalties. Never take a cash distribution of a 401(k) before age 59½ unless absolutely necessary — you'll owe income tax plus a 10% early withdrawal penalty, erasing years of growth.