Roth vs Traditional IRA comes down to one question: do you want to pay tax on the money now or later? The two accounts share the same 2026 contribution limit, but the tax treatment is different, and my example below shows how your future tax rate decides which one comes out ahead.
The 2026 Numbers Behind the Decision
The IRS announced a 2026 IRA contribution limit of $7,500, with a $1,100 catch-up for age 50 and over (so $8,600). The IRS says the combined limit applies to all of your Roth and traditional IRAs, and that you can’t deduct Roth contributions.
- Roth IRA income phase-out (2026): $153,000 to $168,000 for single and head of household filers; $242,000 to $252,000 for married filing jointly.
- Traditional IRA deduction phase-out when covered by a workplace plan (2026): $81,000 to $91,000 for single filers; $129,000 to $149,000 for married filing jointly when the contributing spouse is covered.
- Not covered, but your spouse is (married filing jointly): $242,000 to $252,000.
Those phase-outs affect whether you can contribute to a Roth or deduct a traditional contribution.
How the Two Accounts Differ
A traditional IRA contribution may be deductible now, and withdrawals are taxed later. A Roth IRA contribution isn’t deductible, and qualified distributions are tax-free if you meet the requirements, which the IRS refers to Publication 590-B for.
Roth vs Traditional IRA: The Math With an Equal and a Different Tax Rate
Here is an example with assumed numbers. A $7,000 traditional contribution grows at a constant 7% for 40 years to $104,821.20. If you pay a 22% tax rate on withdrawal, you keep $81,760.54.
For a fair comparison, a Roth has to cost the same after tax. If your 22% rate applied today, $7,000 of pre-tax money is $5460 after tax, so you’d put $5,460.00 in a Roth. That grows to $81,760.54, the same amount.
In other words, when your tax rate stays the same, the two come out equal. The difference comes from a change in your rate:
| Retirement tax rate (assumed) | Traditional, after tax | Roth |
|---|---|---|
| 12% | $92,242.66 | $81,760.54 |
| 22% | $81,760.54 | $81,760.54 |
| 32% | $71,278.42 | $81,760.54 |
These are illustrations of the mechanism, not forecasts. A higher retirement rate favors the Roth, and a lower one favors the traditional account. In my view, that’s the real decision: a bet on your future tax rate.
When Each Might Fit
- If you expect a higher rate later (for example, early in a career): a Roth may fit. That’s my reasoning, and no one can know future tax rates.
- If you expect a lower rate later: the traditional deduction may serve you better.
- If you can’t predict your rate: I consider splitting contributions a reasonable hedge. The combined limit still applies.
Who Can Contribute in the First Place
Both account types require taxable compensation. The IRS lists wages, commissions, tips, bonuses and net self-employment income as compensation, and says investment income, rental income and pension or annuity payments don’t count. It also says there is no age limit for contributing as long as you have that compensation, and that on a joint return the compensation requirement can be met by you or your spouse (IRS Topic 451: Individual retirement arrangements). The Roth IRA page adds that you can keep contributing to a Roth IRA after age 70½ (IRS: Roth IRAs). I see that as good news for anyone who started late or is working past traditional retirement age.
What Happens When You Take Money Out
- Traditional IRA: distributions are fully or partially taxable in the year you take them. If you made only deductible contributions, the full distribution is taxable; if you made nondeductible contributions, Form 8606 is used to figure the taxable part.
- Roth IRA, return of contributions: withdrawals that return your own contributions aren’t taxed.
- Roth IRA, qualified distributions: the IRS describes a qualified distribution as one taken after age 59½ and after the 5-year period that starts with the first tax year you contributed to a Roth IRA, and says earnings from qualified distributions aren’t taxed.
- Early withdrawals: taxable distributions from a traditional or Roth IRA taken before age 59½ may face an additional 10% tax unless an exception applies.
These are the IRS Topic 451 descriptions, and the IRS points to Publication 590-B for the full list of exceptions and conditions.
A Second Example: 30 Years, a Different Contribution
To test the “same rate, same result” idea with another set of assumed numbers, take the 2026 limit of $7,500 and a constant 7% annual return for 30 years. A traditional contribution grows to $57,091.91. The table shows what you keep after tax at three assumed retirement rates, next to a Roth funded with the same after-tax cost (a 22% rate today, so $5,850 goes into the Roth).
| Retirement tax rate (assumed) | Traditional, after tax | Roth (funded at a 22% rate today) |
|---|---|---|
| 12% | $50,240.88 | $44,531.69 |
| 22% | $44,531.69 | $44,531.69 |
| 32% | $38,822.50 | $44,531.69 |
The pattern matches the first example: at an equal rate the two match, a lower retirement rate favors the traditional account, and a higher one favors the Roth. The numbers are assumed and the 7% is not a forecast. My takeaway is that the habit of contributing every year is worth more than the choice between the two when your rate is about the same.
What Four Years of Contributions Cost in Tax (Assumed 22%)
Here is the tax at stake over four years of full contributions, using an assumed rate. Take the 2026 IRA limit of $7,500 and contribute it for four years: that is $30,000. At an assumed 22% rate, $30,000 × 0.22 = $6,600. That is the tax on that money, and the Roth-versus-traditional choice is about when you pay it. With a Roth you pay it now, because contributions aren’t deductible. With a traditional IRA you may defer it if the contribution is deductible (see the phase-out ranges above), and you pay tax on withdrawals later.
The earlier tables show the key point: the $6,600 doesn’t disappear either way, so what matters is whether your rate on withdrawal is higher or lower than the 22% you’d skip or pay today. I find it helpful to run that comparison with your own rate before choosing.
The Backdoor Roth, in Outline
If your income is above the Roth phase-out, one approach is a nondeductible traditional IRA contribution followed by a conversion to a Roth. The Form 8606 instructions say you generally must file the form if you made nondeductible traditional IRA contributions or converted an amount to a Roth, and that the penalty for failing to file when required for a nondeductible contribution is $50 unless you show reasonable cause.
The Pro-Rata Rule
The same instructions say the taxable part of a conversion is figured using the total value of your traditional, SEP and SIMPLE IRAs at the end of the year, plus the amount converted. As an assumed example, with a $50,000 pre-tax SEP IRA and a $7,500 nondeductible contribution that you convert, the nontaxable share is $7,500 ÷ $57,500 and the taxable part of the conversion is about $6,521.74, not $0. Check your year-end IRA balances before attempting this.
Required Minimum Distributions
The IRS FAQ says RMDs generally must begin in the year you reach age 73, and that RMDs don’t apply to Roth IRAs while the owner is alive. A missed RMD may be subject to a 25% excise tax, reduced to 10% if corrected within two years.
Which Account Fits You
- “I expect a higher tax rate later.” → A Roth may fit.
- “I expect a lower rate in retirement.” → A traditional deduction may fit.
- “I can’t predict.” → Splitting contributions is one option.
- “My income is over the Roth limit.” → See the backdoor outline above and the pro-rata example.
- “I don’t want forced withdrawals.” → Roth IRAs have no RMDs for the owner, per the IRS.
Quick Roth vs Traditional Answers
Is the $7,500 limit per account type? The IRS says the combined limit applies to all your Roth and traditional IRAs.
Do Roth IRAs have RMDs? Not during the owner’s lifetime, per the IRS FAQ.
Does my tax rate decide it? In my example, yes. At equal rates the two came out the same.
Before You Choose
In the Roth vs Traditional IRA choice, neither account is universally better. The decision rests on your future tax rate, and, for backdoor Roths, on your year-end IRA balances. To me, opening one and contributing consistently matters more than picking the mathematically perfect account. If you are just starting out, Investing With a Small Amount of Money: Why “You Need a Windfall to Start” Is Wrong walks through a first-week plan.
This article offers general information and my own opinions, not financial, tax, or legal advice. The figures in worked examples are assumed. Laws, tax rules, and products change and can differ by location, so check current official sources and talk to a qualified professional about your own situation.
Sources: