The main differences between retirement account types
The account you choose for retirement savings determines how much you can set aside each year, when you can withdraw the money without penalty, and whether your contributions or growth are taxed now or later. A 401(k) is an employer-sponsored plan where you contribute through payroll deductions; a traditional IRA lets you set aside money on your own with potential tax deductions; a Roth IRA takes after-tax contributions but lets withdrawals grow tax-free; and a SEP IRA or Solo 401(k) is built for self-employed people or small business owners. Each has different contribution limits, income thresholds, and rules about when you can take money out.
The choice depends on whether your employer offers a plan, how much you earn, whether you want to reduce your taxes now or in retirement, and when you might need access to the money. Someone with a stable job and an employer match should usually prioritize the 401(k) first; someone self-employed needs a different structure; someone with high income may hit contribution limits and need multiple accounts.
Key Takeaways
- 401(k) plans let you contribute up to $23,500 per year (2024), and many employers match a portion of what you contribute, making them the first choice if available.
- Traditional IRAs and Roth IRAs each allow $7,000 per year (2024), but Roth has income limits that phase out for higher earners, while traditional has no income limit.
- Traditional contributions may lower your current tax bill, while Roth contributions are made with after-tax money but withdrawals in retirement are tax-free.
- You cannot withdraw from a traditional IRA or 401(k) before age 59½ without a 10% penalty, with limited exceptions; Roth contributions (not earnings) can be withdrawn anytime penalty-free.
- Self-employed people can contribute much more through a SEP IRA or Solo 401(k) than through a regular IRA.
401(k) plans: employer-sponsored accounts with matching
A 401(k) is offered by your employer and deducts contributions directly from your paycheck before taxes. For 2024, you can contribute up to $23,500 per year if you are under 50; if you are 50 or older, you can add an extra $7,500 "catch-up" contribution, for a total of $31,000. Your employer may match a portion of what you contribute—commonly 50% of the first 6% you set aside, though the match varies by company.
The money grows tax-deferred, meaning you do not pay income tax on the growth until you withdraw it in retirement. When you withdraw, the entire amount (your contributions plus growth) is taxed as ordinary income. If you leave your job, you can roll the 401(k) into an IRA to keep it invested, or leave it with your former employer's plan if the balance is above a certain threshold (usually $5,000).
You cannot withdraw before age 59½ without owing a 10% early withdrawal penalty plus income tax on the amount withdrawn. Exceptions exist for hardship withdrawals (defined narrowly by the IRS), loans from the plan, or if you separate from service at age 55 or later. Your employer's plan document spells out which exceptions explore.
Traditional IRAs: tax-deductible contributions, taxed withdrawals
A traditional IRA is an individual account you open yourself, not through an employer. You can contribute up to $7,000 per year (2024); if you are 50 or older, you can add $1,000 more for a total of $8,000. The contribution may be tax-deductible in the year you make it, which lowers your taxable income for that year.
Whether you can deduct the full amount depends on your income and whether you have access to an employer plan. If you have no employer plan, you can deduct the full contribution no matter how much you earn. If you do have access to a 401(k) or similar plan at work, the deduction phases out above a certain income threshold—for 2024, that threshold is $77,000 to $87,000 for single filers and $123,000 to $143,000 for married couples filing jointly. The exact phase-out range changes each year.
Money in a traditional IRA grows tax-deferred. When you withdraw in retirement, you pay ordinary income tax on the entire amount. You must begin withdrawals at age 73 (as of 2023, under the find 2.0 Act); the IRS calculates a minimum amount you must take each year based on your age and account balance. If you withdraw before age 59½, you owe a 10% penalty plus income tax, with limited exceptions such as a first-time home purchase (up to $10,000 lifetime) or certain medical expenses.
Roth IRAs: after-tax contributions, tax-free growth and withdrawals
A Roth IRA works in reverse: you contribute money that has already been taxed, so you get no deduction now. But the money grows tax-free, and withdrawals in retirement are tax-free. For 2024, the contribution limit is $7,000 per year (or $8,000 if you are 50 or older), the same as a traditional IRA.
The catch is income limits. If your modified adjusted gross income exceeds $146,000 (single) or $230,000 (married filing jointly) in 2024, you cannot contribute the full amount; the contribution phases out and disappears entirely at higher income levels. These thresholds change annually. If you earn too much to contribute directly, you can use a "backdoor Roth" strategy: contribute to a traditional IRA and then convert it to a Roth, though this has tax complications if you already have traditional IRA balances.
You can withdraw your contributions (the money you put in) anytime without penalty or tax. You can withdraw earnings (the growth) penalty-free at age 59½ if the account has been open at least five years. Before age 59½, you can withdraw earnings only in narrow circumstances: first-time home purchase, disability, medical expenses, or higher education costs. Unlike a traditional IRA, there is no required minimum withdrawal age for a Roth.
SEP IRAs and Solo 401(k)s for self-employed people
If you are self-employed or own a small business, a SEP IRA (Simplified Employee Pension) or Solo 401(k) lets you set aside far more than a regular IRA. A SEP IRA allows contributions up to 25% of your net self-employment income, with a maximum of $69,000 per year (2024). A Solo 401(k) lets you contribute as both employee and employer, potentially reaching $69,000 per year as well, plus an additional $7,500 catch-up contribution if you are 50 or older.
A SEP IRA is simpler to set up and maintain—you file a one-page form with the IRS and can open it as late as your tax filing important date. A Solo 401(k) requires more paperwork but offers more flexibility, including the ability to borrow from the plan and to make Roth contributions if you choose a Roth Solo 401(k).
Both are tax-deferred accounts: contributions lower your current taxable income, and withdrawals in retirement are taxed as ordinary income. Withdrawal rules are similar to a traditional IRA—you cannot withdraw before 59½ without penalty, and you must begin required minimum withdrawals at age 73.
Comparing contribution limits and tax treatment
| Account Type | 2024 Contribution Limit (Under 50) | 2024 Contribution Limit (Age 50+) | Tax Treatment of Contributions | Tax Treatment of Withdrawals |
|---|---|---|---|---|
| 401(k) | $23,500 | $31,000 | Pre-tax (reduces current income) | Taxed as ordinary income |
| Traditional IRA | $7,000 | $8,000 | May be deductible (depends on income and employer plan access) | Taxed as ordinary income |
| Roth IRA | $7,000 | $8,000 | After-tax (no deduction) | Tax-free (if account open 5+ years and age 59½+) |
| SEP IRA | Up to 25% of net self-employment income, max $69,000 | Up to 25% of net self-employment income, max $69,000 | Pre-tax (reduces current income) | Taxed as ordinary income |
| Solo 401(k) | Up to $69,000 (employee + employer combined) | Up to $76,500 (with $7,500 catch-up) | Pre-tax (reduces current income) | Taxed as ordinary income |
Early withdrawal rules and penalties
All retirement accounts penalize early withdrawal to discourage taking money out before retirement. A traditional IRA, 401(k), or SEP IRA charges a 10% penalty plus ordinary income tax if you withdraw before age 59½. A Roth IRA is more flexible: you can withdraw your contributions anytime without penalty, but earnings are subject to the 10% penalty and income tax if withdrawn before 59½.
The IRS allows some exceptions to the early withdrawal penalty (though not the income tax). These include substantially equal periodic payments (SEPP), a first-time home purchase (up to $10,000 lifetime for traditional or Roth), unreimbursed medical expenses above 7.5% of adjusted gross income, disability, and higher education expenses. A 401(k) may also allow loans: you borrow from your own balance and repay it with interest, avoiding the penalty. The rules vary by plan, so check your employer's plan document.
Required minimum withdrawals begin at age 73 for traditional IRAs and 401(k)s (under current law). The IRS calculates the minimum based on your age and account balance; if you do not withdraw enough, you owe a 25% penalty on the shortfall (reduced to 10% if corrected timely). Roth IRAs have no required minimum withdrawal during the account holder's lifetime.
Employer match and why it matters
If your employer offers a 401(k) match, that is information programs added to your account. A common match is 50% of the first 6% you contribute—meaning if you contribute 6% of your salary, your employer adds 3%. Some employers match 100% of the first 3%, or other formulas. The match vests (becomes yours to keep) on a schedule set by your employer, typically over three to five years.
Because of the match, a 401(k) usually makes sense before opening an IRA, even if the 401(k) has higher fees. If you contribute enough to capture the full match, you are getting an when ready return on your money that no IRA can match. After capturing the full employer match, you can decide whether to contribute more to the 401(k) or open an IRA for additional savings.
Frequently Asked Questions
Can I have both a 401(k) and an IRA at the same time?
Yes. You can contribute to both a 401(k) and a traditional or Roth IRA in the same year. However, if you have a 401(k) at work, the deduction for a traditional IRA contribution phases out above certain income levels. Roth IRA contributions have their own income limits regardless of whether you have a 401(k).
What happens to my 401(k) if I leave my job?
You have several options: roll it into an IRA (which gives you more investment choices), roll it into your new employer's 401(k) if they accept rollovers, leave it with your former employer if the balance is above the minimum (usually $5,000), or cash it out (which triggers taxes and a 10% penalty if you are under 59½). Most people roll it into an IRA to maintain tax-deferred growth.
Should I choose a traditional or Roth IRA?
Choose traditional if you want to lower your taxes now and expect to be in a lower tax bracket in retirement. Choose Roth if you expect to be in a higher tax bracket later, want tax-free withdrawals in retirement, or want flexibility (you can withdraw contributions anytime). If your income is too high for a Roth, a backdoor Roth conversion may be an option, though it has tax implications if you have existing traditional IRA balances.
What is the difference between a SEP IRA and a Solo 401(k)?
A SEP IRA is simpler to set up and maintain but limits you to employee-plus-employer contributions. A Solo 401(k) requires more paperwork but allows higher total contributions, lets you borrow from the plan, and offers Roth options. If you have employees, a SEP IRA is simpler; if you are truly self-employed with no employees, a Solo 401(k) may allow larger contributions.
Can I withdraw from my Roth IRA before retirement?
You can withdraw your contributions (the money you deposited) anytime without penalty or tax. Withdrawing earnings before age 59½ triggers a 10% penalty and income tax, unless you meet a narrow exception such as first-time home purchase, disability, or medical expenses. This flexibility is one advantage of a Roth over a traditional account.