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Understanding IRAs and 401(k)s: The Basics

A retirement account is a savings tool that lets you set aside money for your later years. Two common types are IRAs (Individual Retirement Accounts) and 401(k) plans. While both serve the same general purpose—helping you save for retirement—they work differently and have different rules.

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An IRA is a retirement account you open on your own, often through a bank, brokerage firm, or credit union. You control the account yourself. A 401(k) is a retirement plan offered by your employer. Your employer may contribute money to your account, and the money grows over time through investments.

The main difference between them relates to who sets them up and manages them. With an IRA, you handle everything. With a 401(k), your employer handles much of the administrative work. This affects how much money you can contribute each year, what types of investments are available, and when you can access the money.

Both account types offer tax advantages. This means the government allows you to either put in pre-tax money (reducing your taxable income now) or withdraw money tax-free later, depending on which type of account you choose. These tax benefits are why these accounts are so popular for retirement saving.

A comparison guide walks through these differences in detail, explaining how each account type works, what the rules are, and which situations might make one account type better than another for your circumstances. Understanding these basics helps you think through which account might fit your situation.

Practical takeaway: Spend time learning whether your employer offers a 401(k) and whether you have the option to open an IRA. These two pieces of information are your starting point for understanding which accounts may be available to you.

How IRAs Work: Types and Contribution Limits

There are several types of IRAs, each with different rules. The two most common are Traditional IRAs and Roth IRAs. A Traditional IRA lets you contribute money that may reduce your taxable income in the year you contribute. When you withdraw money in retirement, you pay income tax on it. This approach works well if you think you'll be in a lower tax bracket when you retire.

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A Roth IRA works the opposite way. You contribute money that has already been taxed (you don't get a tax deduction now), but when you withdraw money in retirement, it comes out tax-free. This approach works well if you think you'll be in a higher tax bracket when you retire, or if you simply prefer tax-free withdrawals later.

There are also SEP IRAs and Solo 401(k)s, which are designed for self-employed people and small business owners. These accounts allow for larger contributions than standard IRAs. A SEP IRA is particularly simple to set up and maintain, making it popular among freelancers and people who run their own businesses.

Contribution limits change each year. For 2024, most people can contribute up to $7,000 to an IRA (whether Traditional or Roth). If you're 50 or older, you can contribute an additional $1,000, for a total of $8,000. The IRS sets these limits and announces them each year. Self-employed people using a SEP IRA can contribute much more—up to 25% of their net self-employment income, with a maximum of $69,000 in 2024.

You must have earned income to contribute to an IRA. Earned income means money you received from working—wages, salary, self-employment income, or similar sources. You cannot contribute money from investments, retirement accounts, or other passive sources. You can open and contribute to an IRA at any age, as long as you have earned income.

Practical takeaway: Write down how much you earned last year and your age. These two facts help determine how much you could potentially contribute to an IRA and which type might make sense for your tax situation.

Understanding 401(k) Plans: Employer Contributions and Matching

A 401(k) is an employer-sponsored retirement plan. Your employer sets up the plan, chooses which investment options are available, and handles most of the paperwork. Many employers also contribute money to your 401(k)—a benefit called an employer match.

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Here's how employer matching typically works: Your employer might say "We'll match 3% of what you contribute." This means if you contribute 3% of your salary to your 401(k), your employer adds another 3%. That's essentially free money. Some employers match a different percentage, and some don't offer matching at all. Understanding your employer's match (if one exists) is important because it affects how much you can save without spending your own money.

Like IRAs, 401(k)s come in Traditional and Roth versions. Traditional 401(k) contributions reduce your taxable income today, and you pay taxes when you withdraw in retirement. Roth 401(k) contributions are made with after-tax money, but withdrawals in retirement are tax-free. Not all employers offer both options—you can only choose from the options your employer provides.

Contribution limits for 401(k)s are much higher than for IRAs. In 2024, you can contribute up to $23,500 to a 401(k). If you're 50 or older, you can contribute an additional $7,500, for a total of $31,000. Note that these limits apply to your contributions only—your employer's matching contribution is separate and doesn't count toward your limit (though there is a combined limit).

One major advantage of 401(k)s is that they're easier to borrow from if you need money before retirement. Many 401(k) plans allow loans, where you borrow from your own account and pay it back with interest. IRAs have much stricter rules about accessing money early, usually with penalties if you withdraw before age 59½.

Vesting is another important 401(k) concept. This means the employer's matching contributions may not be yours to keep immediately. Your employer might require you to stay with the company for a certain period (often three to five years) before you own the employer's contributions. Your own contributions always belong to you from day one. A comparison guide explains your employer's specific vesting schedule so you understand when employer contributions truly become yours.

Practical takeaway: Find your most recent 401(k) statement or talk to your employer's benefits department. Write down your employer's matching percentage, your current contribution percentage, and the vesting schedule. These facts show you whether you're taking full advantage of available employer contributions.

Tax Treatment: How Taxes Affect Your Retirement Savings

Tax treatment is one of the most important differences between retirement account types, and it significantly affects how much money you'll have in retirement. Understanding this difference helps you make informed choices about which accounts to use.

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Traditional IRAs and Traditional 401(k)s offer what's called a tax deduction. This means the money you contribute reduces your taxable income for the year. For example, if you earn $60,000 and contribute $7,000 to a Traditional IRA, you might only report $53,000 as income to the IRS. This can lower your tax bill that year. However, when you withdraw money in retirement, every dollar you withdraw is treated as regular income and taxed at your current tax rate.

Roth IRAs and Roth 401(k)s work the opposite way. You contribute money that's already been taxed, so you don't get a tax deduction when you contribute. But when you withdraw money in retirement, you pay no income tax on it at all. This can be a huge advantage if you expect to have a higher income in retirement, or if you simply prefer certainty about your tax situation in the future.

Which option makes sense depends on your situation. If you're in a high tax bracket now and expect to be in a lower one in retirement, a Traditional account might save you more in taxes overall. If you're in a low tax bracket now and expect to be in a higher one later, a Roth account might be better. Some people use both types—contributing to a Traditional account for immediate tax savings and a Roth account for tax-free retirement withdrawals.

There's also an important rule called Required Minimum Distributions (RMDs). With Traditional IRAs and Traditional 401(k)s, you must start withdrawing money at age