A Roth IRA is funded with after-tax money, not pretax dollars
When you contribute to a Roth IRA, you use money you have already paid income tax on. This is the opposite of a traditional IRA, where contributions often reduce your taxable income in the year you make them. With a Roth, there is no tax deduction upfront — you contribute after your taxes are settled.
The trade-off is that your withdrawals in retirement are tax-free. Once you reach age 59½ and have held the account for at least five years, you can withdraw your earnings without owing federal income tax. This makes the Roth useful if you expect to be in a higher tax bracket later, or if you simply want to lock in today's tax rate and avoid surprises in retirement.
Key Takeaways
- Roth IRA contributions come from after-tax income, so you do not reduce your current year's taxable income.
- Traditional IRA contributions are often pretax, meaning they lower your taxable income in the year you contribute.
- Roth earnings grow tax-free and withdrawals after age 59½ (and five years of account ownership) owe no federal income tax.
- Your income level determines whether you can contribute to a Roth IRA in a given year; the limits change annually.
How pretax and after-tax contributions work differently
A pretax contribution reduces your taxable income right away. If you earn $60,000 and contribute $7,000 to a traditional IRA, your taxable income drops to $53,000. You pay less in federal income tax that year. The money grows inside the account tax-deferred, but when you withdraw it in retirement, every dollar is taxed as ordinary income.
An after-tax contribution to a Roth does not lower your taxable income. You still owe tax on the full $60,000. But the $7,000 you put in grows tax-free, and you never pay tax on it again — not on the contribution, not on the earnings. This is why the Roth is sometimes called a "pay taxes now, not later" account.
The choice between the two depends on whether you think your tax rate will be higher or lower in retirement. If you expect to earn less and fall into a lower bracket, a traditional IRA's upfront deduction saves you more. If you expect to earn the same or more, or if you want certainty about your tax bill, the Roth's tax-free withdrawals often make more sense.
Income limits for Roth IRA contributions
Not everyone can contribute to a Roth IRA. The IRS sets income limits that change each year. If your modified adjusted gross income (MAGI) exceeds the limit for your filing status, you cannot contribute the full amount — and above a certain threshold, you cannot contribute at all.
For 2024, the income limits for single filers begin to phase out at $146,000 and end at $161,000. For married couples filing jointly, the phase-out range is $230,000 to $240,000. These numbers shift annually, so you will need to check the current year's limits when you plan to contribute. If your income is above the limit, you may still be able to use a backdoor Roth strategy, which involves contributing to a traditional IRA and then converting it to a Roth, though this has its own rules and tax implications.
Roth vs. traditional IRA: a side-by-side comparison
| Feature | Roth IRA | Traditional IRA |
|---|---|---|
| Contribution type | After-tax | Pretax (usually) |
| Tax deduction now | No | Yes (if you meet income limits) |
| Tax on withdrawals in retirement | None (after age 59½, five-year rule) | Ordinary income tax on all withdrawals |
| Income limits to contribute | Yes, phased out at higher incomes | No income limit, but deduction phases out |
| Required minimum distributions (RMDs) | None during your lifetime | Begin at age 73 (as of 2023) |
When the Roth's after-tax structure makes sense
The Roth works best if you have decades until retirement and expect your income to stay stable or rise. Because you pay tax now at your current rate, you lock in that rate for all future growth. If tax rates increase, you come out ahead. You also avoid required minimum distributions (RMDs) during your lifetime, which means you can leave the account untouched if you do not need the money.
The Roth is also useful if you want to leave money to heirs. Your beneficiaries inherit the account tax-free (though they must withdraw it within ten years under current rules). With a traditional IRA, they owe income tax on every withdrawal.
If your income is currently low — perhaps you are early in your career, between jobs, or taking a year off — a Roth contribution locks in that low tax rate. The money you contribute at 12% tax today will never be taxed again, even if you are in the 24% or 32% bracket when you retire.
Conversions and the five-year rule
You can convert money from a traditional IRA to a Roth IRA at any time, but you will owe income tax on the amount converted in that tax year. This is sometimes called a Roth conversion. After the conversion, the money follows Roth rules: it grows tax-free and can be withdrawn tax-free after age 59½.
There is a five-year holding period for each conversion. If you convert $10,000 in 2024, you cannot withdraw those specific $10,000 without penalty until 2029 (even if you are over 59½). However, you can always withdraw your original Roth contributions (not conversions or earnings) at any age without penalty.
Frequently Asked Questions
Can I contribute to both a Roth and a traditional IRA in the same year?
Yes, but your total contributions to both accounts combined cannot exceed the annual limit (currently $7,000 for those under 50, or $8,000 if you are 50 or older). If you contribute $4,000 to a Roth, you can only contribute $3,000 to a traditional IRA that year.
Do I have to pay taxes on Roth IRA earnings when I withdraw them?
No, as long as you are at least 59½ and have owned the Roth for at least five years. If you withdraw earnings before meeting both conditions, you owe income tax on the earnings plus a 10% penalty. Contributions themselves can always be withdrawn tax-free.
What happens if my income rises above the Roth limit?
You cannot contribute directly to a Roth that year. However, you may be able to use a backdoor Roth: contribute to a traditional IRA (which has no income limit) and then convert it to a Roth. This strategy has tax implications if you have other traditional IRA balances, so consult a tax professional first.
Is a Roth IRA better than a traditional IRA?
It depends on your current tax bracket, expected retirement income, and how long you have until retirement. A Roth is often better if you are young, expect higher future earnings, or want to avoid RMDs. A traditional IRA may be better if you need a tax deduction now or expect to be in a lower bracket in retirement.