A Roth IRA is funded with after-tax money, not pre-tax money
A Roth IRA is the opposite of pre-tax. You contribute money you have already paid income tax on, and then the money grows tax-free inside the account. When you withdraw it in retirement, you owe no tax on the growth or the original contributions. A traditional IRA, by contrast, lets you deduct contributions from your taxable income in the year you make them — that is the pre-tax version.
The trade-off is straightforward: with a Roth, you pay tax now on smaller amounts of money, and with a traditional IRA, you defer tax to retirement when you may be in a lower tax bracket. Which one makes sense depends on whether you think your tax rate will be higher or lower when you retire.
Key Takeaways
- Roth IRA contributions come from money you have already paid income tax on, so you cannot deduct them from your current year's taxes.
- The money inside a Roth grows tax-free, and you pay no tax when you withdraw it in retirement, including on all the growth.
- A traditional IRA is the pre-tax option — you deduct contributions now and pay tax on withdrawals later.
- Roth IRAs have income limits that prevent high earners from contributing directly, while traditional IRAs do not.
Why the difference matters for your taxes
When you file your tax return, a traditional IRA contribution reduces your taxable income dollar-for-dollar (up to the annual limit). A Roth contribution does not. If you contribute $7,000 to a traditional IRA, your taxable income drops by $7,000. If you contribute $7,000 to a Roth, your taxable income stays the same.
This means a Roth does not lower your tax bill this year. But it also means you never owe tax on the money again — not when it grows, not when you take it out. A traditional IRA defers the tax bill to retirement, when you withdraw the money and it counts as ordinary income.
Income limits for Roth contributions
The IRS sets income limits on who can contribute directly to a Roth IRA. If your income is above the limit for your filing status, you cannot contribute that year. The limits change annually. For 2024, the phase-out range for single filers starts at $146,000 and ends at $161,000 of modified adjusted gross income. For married filing jointly, it starts at $230,000 and ends at $240,000.
Traditional IRAs have no income limit — anyone with earned income can contribute. However, if you or your spouse have a workplace retirement plan (like a 401(k)), the deduction for a traditional IRA contribution phases out at higher incomes. This is a different limit than the Roth limit, and it varies by filing status and whether you have a plan at work.
Withdrawal rules and the tax advantage in retirement
With a traditional IRA, you must pay income tax on every dollar you withdraw in retirement. The entire withdrawal is taxed as ordinary income at whatever your tax rate is that year. With a Roth, you withdraw your contributions and earnings completely tax-free, as long as the account has been open for at least five years and you are at least 59½ years old.
This is where the Roth's after-tax structure becomes valuable. If your investments grow significantly, all that growth is yours to keep. A traditional IRA would tax you on the growth when you withdraw it. For people who expect to be in a higher tax bracket in retirement, or who expect significant investment growth, a Roth can save thousands in taxes over your lifetime.
Converting a traditional IRA to a Roth
If you have a traditional IRA and want to move it to a Roth, you can do a Roth conversion. You withdraw money from the traditional IRA and deposit it into a Roth within 60 days. The amount you convert counts as taxable income in the year you do the conversion, but after that, the money grows tax-free in the Roth.
A conversion makes sense if you expect to be in a higher tax bracket later, or if you want to lock in a lower tax rate now. It also makes sense if you have a large traditional IRA balance and want to reduce the amount you must withdraw later (traditional IRAs require minimum withdrawals starting at age 73). There is no income limit on conversions, so even high earners can use this strategy to fund a Roth indirectly.
Comparing Roth and traditional IRAs side by side
| Feature | Roth IRA | Traditional IRA |
|---|---|---|
| Contribution tax treatment | After-tax (no deduction) | Pre-tax (deductible) |
| Growth inside account | Tax-free | Tax-deferred |
| Withdrawals in retirement | Tax-free (after 5 years, age 59½) | Fully taxable as income |
| Income limits on contributions | Yes, phase-out at higher incomes | No income limit |
| Required minimum withdrawals | None during your lifetime | Required starting at age 73 |
| Contribution limit (2024) | $7,000 (or $8,000 if age 50+) | $7,000 (or $8,000 if age 50+) |
Which one should you choose
Choose a Roth if you are in a lower tax bracket now than you expect to be in retirement, or if you want tax-free growth and withdrawals. Roths are also good if you want flexibility — you can withdraw your contributions (not earnings) anytime without penalty, and there are no required withdrawals during your lifetime.
Choose a traditional IRA if you want to lower your taxable income this year, or if you are in a higher tax bracket now than you expect to be in retirement. A traditional IRA also makes sense if your income is too high to contribute to a Roth directly. If you are unsure, you can contribute to both types in the same year, as long as your total contributions across all IRAs do not exceed the annual limit.
Frequently Asked Questions
Can I deduct a Roth IRA contribution on my taxes?
No. Roth contributions are made with after-tax money, so you cannot deduct them. You pay tax on the money before it goes into the account. This is the defining feature that separates a Roth from a traditional IRA.
Do I have to pay taxes on Roth IRA growth?
No. The money inside a Roth grows tax-free. You do not owe tax on dividends, interest, or capital gains while the money is in the account. When you withdraw in retirement (after age 59½ and five years of account ownership), the entire withdrawal is tax-free.
What happens if I withdraw from a Roth before retirement?
You can withdraw your contributions anytime without tax or penalty. If you withdraw earnings before age 59½, you owe income tax on the earnings plus a 10% penalty, unless you may have access to for an exception (like a first-time home purchase, up to $10,000 lifetime).
Can I have both a Roth and a traditional IRA?
Yes, but your total contributions to both accounts in a single year cannot exceed the annual limit ($7,000 in 2024, or $8,000 if age 50 or older). You can split the limit between them however you want.
Is a Roth IRA better than a 401(k)?
They serve different purposes. A 401(k) is a workplace plan that often includes an employer match, which is information programs. A Roth IRA is an individual account with lower contribution limits but more investment choices and withdrawal flexibility. Many people use both — they contribute to a 401(k) to get the match, then max out a Roth IRA with additional savings.