Roth IRA vs. Traditional IRA vs. 401(k): A Beginner's Comparison

What a retirement account actually is

A retirement account isn't an investment. It's a container with special tax rules that you put investments in. Inside it you can hold index funds, ETFs, stocks, bonds and more, exactly as you would in a regular brokerage account.

The government offers tax advantages to encourage saving, and in exchange the accounts come with strings attached, mostly limits on when you can take money out without a penalty. Understanding those two things, the tax benefit and the strings, is most of what you need to know.

The one idea that explains everything: pay tax now or later

Every retirement account gives you a choice about *when* the tax bill arrives.

• Traditional (pre-tax): You may get a tax break now, because the money you contribute can reduce your taxable income this year. The investments grow without yearly tax, but you pay ordinary income tax when you withdraw in retirement.
• Roth (after-tax): You get no tax break now. You contribute money you've already paid tax on. In return, the money grows tax-free, and qualified withdrawals in retirement are tax-free too.

A quick example. Suppose a $1,000 contribution doubles over the years. In a traditional account, you'd owe income tax on the whole $2,000 when you take it out. In a Roth account, you'd owe nothing on that $2,000, but you already paid tax on the original $1,000 up front.

Which is better depends mostly on whether your tax rate will be higher now or in retirement. If you expect to be in a higher bracket later, paying tax now with a Roth can win. If you expect a lower bracket later, the upfront break of a traditional account can win. Nobody can predict future tax rates with certainty, so many people use a mix.

The 401(k): the employer plan

A 401(k) is a retirement plan offered through an employer (403(b) plans are the equivalent for schools and many nonprofits). Your contributions come out of your paycheck automatically, which makes saving effortless.

• Employer match. Many employers add money when you contribute, for example matching 50 cents for every dollar you put in, up to a limit. This is often the best deal in personal finance, since it's an immediate return on your contribution. If your employer offers one, getting the full match is usually the first priority.
• Higher limits. You can generally contribute much more to a 401(k) each year than to an IRA. The IRS sets the limit annually and raises it from time to time, so check the current figure rather than relying on an old one.
• Limited choices. You pick from the plan's menu of funds. Look for a low-cost index fund or a target-date fund, and check the fees, since plan costs can vary widely.
• Vesting. Your own contributions are always yours, but the employer's match may vest over time. If you leave a job early, you might forfeit part of it.
• Roth option. Many plans offer a Roth 401(k) alongside the traditional one, so you can choose your tax treatment.

When you leave a job, you can usually roll the 401(k) into an IRA or your new employer's plan without paying tax, as long as you do it correctly.

The traditional IRA

An IRA, or Individual Retirement Account, is one you open yourself at a brokerage, independent of any employer. You choose from nearly any investment, which usually means cheaper and more flexible options than an employer plan.

With a traditional IRA, contributions may be tax-deductible, but whether they are depends on your income and whether you or your spouse are covered by a workplace plan. Growth is tax-deferred, and you pay income tax on withdrawals. The IRS also requires you to start taking minimum withdrawals from traditional accounts in your seventies, so the money can't sit untaxed forever.

You need earned income, like wages or self-employment income, to contribute, and there's a yearly contribution limit set by the IRS.

The Roth IRA

A Roth IRA works the opposite way. You contribute after-tax money, so there's no deduction, but the growth and qualified withdrawals are tax-free. There are no required minimum withdrawals during your lifetime, so it can keep growing as long as you like.

• Income limits. Higher earners can't contribute directly to a Roth IRA. The thresholds are set by the IRS and change over time.
• Flexibility with contributions. You can generally withdraw the money you've contributed (not the growth) at any time without tax or penalty, since you already paid tax on it. That makes a Roth a bit more forgiving than other retirement accounts, though pulling money out undoes its long-term purpose.
• The five-year rule. To withdraw *earnings* tax-free, the account generally needs to be open for at least five years and you need to be 59½ or older, with some exceptions.

Because a Roth IRA gives tax-free growth over decades, it's especially attractive to younger savers, who have the most time for compounding and are often in lower tax brackets early in their careers.

Side by side

The contribution limits for all of these are set by the IRS each year and increase periodically, so always look up the current numbers before you plan.

A common order for filling the buckets

If you can't max everything out (almost nobody can at first), a frequently suggested order of priorities looks like this. It isn't the only reasonable plan, but it's a useful starting framework.

1. Build a small emergency cushion, so a surprise bill doesn't force you to raid your retirement money.
2. Contribute to your 401(k) up to the employer match, if there is one. It's an immediate return you won't find elsewhere.
3. Pay down high-interest debt, like credit cards, since the interest rate usually beats what investments can reliably earn.
4. Fund an IRA, Roth or traditional, depending on your income and your tax outlook. IRAs generally offer cheaper, wider investment choices than many workplace plans.
5. Go back to the 401(k) and contribute more, up to the limit, if you still have money to invest.
6. Invest in a regular brokerage account for goals beyond retirement, or once the tax-advantaged accounts are full.

Roth or traditional: how to lean

• Early in your career with modest income: a Roth often makes sense, since you're likely in a lower tax bracket now than you will be later.
• In a high-earning period: the immediate deduction of a traditional account can be more valuable.
• Unsure: splitting contributions between the two gives you tax diversification, which means flexibility on how you draw money in retirement.
• Employer offers a match: remember that match is typically deposited as pre-tax money into a traditional balance, even if your own contributions go to a Roth 401(k).

These are rules of thumb, not guarantees. If your situation is complicated, a fee-only financial planner or tax professional can look at your whole picture.

The rules about taking money out early

Retirement accounts are designed for retirement, so withdrawing before roughly age 59½ usually triggers a 10% penalty on top of any regular income tax owed. There are exceptions, such as certain medical costs, disability, and for IRAs a limited amount toward a first home, but the rules are specific and easy to get wrong.

This is exactly why the emergency fund comes first. The goal is for your retirement money to stay untouched and growing, not to be your backup plan for surprises.

What to actually buy inside these accounts

Opening the account is only half the job. An empty IRA does nothing, so make sure the money is invested. For most beginners, a low-cost broad index fund, or a target-date fund that automatically becomes more conservative as your retirement year approaches, is a sensible place to begin. Our guides on index funds and starting with $100 cover how to pick one.

Frequently asked questions