401(k) and 403(b): Your First and Best Retirement Account
Before thinking about index funds, Roth conversions, or taxable brokerages, there's one question every investor should answer first: are you capturing your full employer match?
The employer match is the closest thing to free money in personal finance. Understanding how these accounts work — and maxing them out in the right order — is the foundation of any FIRE plan.
What Are They?
401(k) accounts are offered by for-profit employers. 403(b) accounts serve the same purpose for employees of nonprofits, schools, hospitals, and government entities. The mechanics are nearly identical.
Both are employer-sponsored, tax-advantaged retirement accounts. You contribute from your paycheck before taxes are withheld, the money grows tax-deferred, and you pay ordinary income tax when you withdraw in retirement.
The Employer Match: Always Capture It First
Most employers who offer a 401(k) also match a portion of your contributions — commonly 50%–100% of contributions up to 3%–6% of your salary.
If your employer matches 100% up to 4% of salary: contributing 4% of a $100,000 salary means you put in $4,000 and your employer adds $4,000. That's a 100% guaranteed return before the market does anything. No investment can reliably beat that.
Capturing the full match is almost always the right first step in any investment strategy — even ahead of paying off moderate-interest debt.
Contribution Limits
For 2026, the IRS limits employee contributions to $24,500 per year (plus $8,000 in catch-up contributions if you're 50 or older). Employer contributions don't count against this limit; the total combined limit is $72,000.
These limits tend to increase slightly each year with inflation.
How the Tax Deferral Works
When you contribute $1,000 to a traditional 401(k), your taxable income for the year drops by $1,000. If you're in the 22% federal bracket, that's $220 you don't pay in taxes this year.
That money then grows tax-deferred — no taxes on dividends, interest, or capital gains until you withdraw. When you take distributions in retirement, you pay ordinary income tax on the amount withdrawn.
The bet you're making: your tax rate in retirement will be lower than your rate today. For many people, especially high earners, that bet pays off. For early retirees with flexible income, the calculus is more nuanced — see Roth vs. Traditional.
Early Withdrawal and FIRE
Here's the tension for early retirees: 401(k) funds can't be accessed without penalty until age 59½ (with some exceptions). If you retire at 45, you have a 14-year gap.
The main exceptions:
- Rule of 55: If you leave your employer at or after age 55, you can take penalty-free withdrawals from that employer's 401(k).
- 72(t) distributions (SEPP): Substantially Equal Periodic Payments allow penalty-free withdrawals at any age if you commit to a fixed schedule for at least 5 years or until 59½.
- Roth conversion ladder: Convert traditional 401(k) funds to Roth IRA, then withdraw contributions after a 5-year seasoning period. This is the most commonly used FIRE bridge strategy.
Required Minimum Distributions
Starting at age 73, the IRS requires you to withdraw a minimum amount from your 401(k) each year (the RMD). This is irrelevant for early retirees for a long time, but it's worth knowing: large traditional 401(k) balances can force significant taxable income in your 70s.
The FIRE Priority Order
For most people pursuing FIRE, the contribution priority looks like this:
- 401(k) up to the full employer match
- HSA (if eligible) — triple tax advantage
- Roth IRA (or backdoor Roth if over income limits)
- 401(k) up to the annual max
- Taxable brokerage