Retirement Accounts: IRAs & 401(k)s, Explained

Why these accounts matter so much

In a regular account, you owe taxes on your investment gains. Retirement accounts change that deal: the government lets your money grow without that yearly tax drag, in exchange for leaving it invested until retirement. Over decades, that tax advantage can add up to a meaningfully larger pile — it’s the closest thing to a free upgrade that investing offers.

The 401(k) and the match

A 401(k) is a retirement account offered through your employer. Contributions come straight out of your paycheck, often before you ever see the money. The killer feature is the employer match: many employers add money to your account based on what you contribute — for example, matching 100% of the first 4% of your salary you put in.

That match is an instant, guaranteed return on your money. If your employer offers one and you’re not contributing enough to get all of it, that’s the first thing to fix — before anything else in this guide.

Traditional vs. Roth: pay taxes now or later?

Both 401(k)s and IRAs come in two flavors. The only real difference is when you pay tax.

• Traditional — you contribute pre-tax money now (lowering this year’s taxable income) and pay tax when you withdraw in retirement. Good if you expect to be in a lower tax bracket later.
• Roth — you contribute money you’ve already paid tax on, and qualified withdrawals in retirement are completely tax-free. Often the better bet for younger or early-career savers who expect to earn more later.

A common rule of thumb: if you’re early in your career and your tax rate is relatively low, Roth tends to win. If you’re a high earner today, Traditional’s upfront deduction is more attractive. Many people end up with some of each.

IRAs explained

An IRA (Individual Retirement Account) is one you open yourself at a brokerage, separate from any employer. It typically gives you far more investment choices than a 401(k) — including the low-cost index funds we favor. Most people use a Roth IRA for its tax-free growth, subject to income limits (below).

The funding priority order

1. 401(k) up to the full match. Capture every dollar of free money first.
2. Knock out high-interest debt. Paying off a 22% credit card is a guaranteed 22% return — see our debt payoff guide.
3. Max a Roth IRA. Tax-free growth and flexible, broad investment options.
4. Go back and max your 401(k). Keep filling the tax-advantaged bucket.
5. Taxable brokerage account. For anything beyond the limits — still a great place to invest.

This order assumes you already have an emergency fund. If you don’t, build that alongside step 1.

2026 contribution limits

Roth IRA income limits (2026): eligibility phases out between $153,000 and $168,000 for single filers, and between $242,000 and $252,000 for married couples filing jointly. Earn above the range and you can’t contribute directly — though a “backdoor” route may still be available. Limits change yearly, so confirm the current figures before you contribute.

Grow My Pile is educational and not financial, tax, or legal advice. Contribution limits and income thresholds are for 2026 and change over time — verify current figures with the IRS or a qualified professional.