Roth IRA vs. Traditional IRA: Which Is Better?
Last verified: May 28, 2026 against IRS Publication 590-A (contributions) and Publication 590-B (distributions), 2026
From the desk of Josh: financial modeling at a private equity firm. See more by Josh.
The Roth-vs-Traditional question reduces to one comparison: your current marginal tax rate (what an extra deductible dollar saves you today) against your expected retirement effective tax rate (what total tax you'll pay on withdrawals across your retirement income). The honest comparison is apples-to-apples: a Traditional contribution plus the tax savings invested in a taxable account, versus a Roth contribution that already paid tax up front. The calculator below runs both modes and shows the break-even retirement rate at which the two paths tie.
Calculator: Which one wins for you?
Enter your numbers. The math runs in your browser. Nothing leaves the page.
2026 IRA limit: $7,000 ($8,000 if 50+)
e.g. age 35 retiring at 65 = 30
7% real return is the long-run S&P average
Federal + state combined
Total tax / total income in retirement
Pick the one that matches what you actually believe
Pick Roth if you believe...
- Your retirement effective rate will be HIGHER than your current marginal rate (you expect to draw a lot, or live in a high-tax state)
- Tax rates in general will rise over your lifetime (TCJA expires, deficit pressure)
- You're early in your career and your income (and bracket) will climb
- You want flexibility: Roth IRAs have no RMDs, can compound forever, and pass to heirs tax-free
- You want optionality at retirement to manage IRMAA / ACA subsidy thresholds by mixing Roth and Traditional withdrawals
- You're maxing the contribution limit anyway - Roth's $7k effectively shelters more after-tax wealth than Traditional's $7k
Pick Traditional if you believe...
- Your retirement effective rate will be LOWER than your current marginal rate (typical for high earners)
- You'll likely retire to a no-income-tax state (FL, TX, WY, NV, etc.)
- You need the deduction this year to free up cash for other investing or debt payoff
- You plan to do Roth conversion ladders in low-income years (sabbatical, between jobs, early retirement) - convert at lower brackets later
- You're a peak-earnings high-income filer with tax-deductible Traditional access (or via Mega Backdoor Roth wrappers in your 401(k))
- Tax rates will fall over your lifetime (rare bet, but possible)
Show year-by-year math
| Year | Roth balance | Trad pre-tax | Tax-savings sidecar | Trad after-tax total |
|---|
Method: Apples-to-apples mode credits Traditional with the tax savings invested in a taxable brokerage account at the same return, with a 15% effective drag for taxable dividends and capital gains. Naive mode skips the sidecar (compares same dollar in either account). Both modes assume contributions made at year-end. State income tax in retirement varies - adjust the retirement effective rate accordingly.
What the break-even rate actually means
The break-even rate is the retirement effective tax rate at which Traditional and Roth produce the same after-tax retirement income, given the same contribution and the same return assumption. If your expected retirement effective rate is below the break-even, Traditional wins. If it's above, Roth wins. The "apples-to-apples" mode of the calculator (Traditional contribution + the tax-deduction savings invested in a taxable account) is the most defensible comparison; the "naive" mode is what most online comparisons show, and it tends to flatter the Traditional path because it implicitly throws away the tax savings.
From running enough of these in spreadsheets to know: most people underestimate their retirement effective rate. RMDs starting at age 73 (or 75 under SECURE 2.0) frequently push retirees into higher brackets than they expected, especially when one spouse passes and the survivor moves to single filing. State tax matters too. If you contribute today in a no-income-tax state and retire in a high-tax state, your retirement effective rate could be meaningfully higher than your current marginal, which flips the answer toward Roth.
In my first year at the PE firm I defaulted to traditional 401(k) because the rule of thumb is "high earners go traditional." Five years later I ran the post-TCJA brackets through this comparison and the answer flipped: my projected retirement income would land in a similar bracket to today, and Roth offered tax-bracket diversification regardless of which way rates move. I now split 50/50, which is what the calculator above generally recommends when retirement and current rates are within a few points of each other.
Key Differences at a Glance
| Feature | Roth IRA | Traditional IRA |
|---|---|---|
| Tax treatment now | No deduction. You pay taxes first. | Deductible. Lowers your taxable income. |
| Tax treatment in retirement | Withdrawals are 100% tax-free. | Withdrawals are fully taxable as income. |
| 2026 contribution limit | $7,000 ($8,000 if 50+) | $7,000 ($8,000 if 50+) |
| Income limits | Yes. Phases out at high income. | No limits. Always deductible. (Unless spouse has 401k) |
| Required Minimum Distributions (RMDs) | None during your lifetime. | Start at age 73. Mandatory withdrawals. |
| Early withdrawal (before 59.5) | Contributions always. Earnings only with exceptions. | Subject to 10% penalty + income tax. |
When a Roth IRA Wins
You're in a low tax bracket now
If you're early in your career and earn $40,000-$60,000, your marginal federal tax bracket is likely 12%. If you expect to earn significantly more later, locking in a 12% rate today looks brilliant in hindsight. You pay $840 in tax on a $7,000 contribution, but the growth is permanently tax-free.
You expect higher income (and higher tax brackets) in retirement
If you'll be wealthy in retirement (due to pension, Social Security, or investment portfolio), your tax bracket might be 32% or higher. A Roth today at 22% beats a Traditional IRA withdrawal at 32% later. You win by arbitraging tax brackets.
You have a long time horizon (20-40+ years)
Compound interest multiplies with time. At 7% growth over 35 years, $7,000 becomes $93,000. If half is growth (after-tax gains), that's $46,500 in tax-free gains in a Roth. In a Traditional IRA, the entire $93,000 is taxable. Roth's advantage explodes with time.
You want tax-free growth without being forced to withdraw
Traditional IRAs force required minimum distributions (RMDs) starting at age 73. If you don't need the money, you're forced to withdraw and pay taxes anyway. Roth IRAs have no RMDs during your lifetime, letting you leave tax-free wealth to your heirs.
You want flexibility (Roth conversion ladder)
With a Roth conversion ladder, you can convert Traditional IRA money to Roth (paying taxes) in years when your income is low. This is useful for early retirees bridging the gap to age 59.5 while avoiding penalties.
When a Traditional IRA Wins
You're in a high tax bracket now
If you earn $150,000+ as a single filer, your marginal rate is 24% or higher. A $7,000 Traditional IRA contribution saves you $1,680 in taxes immediately. That's real money in your pocket. If you expect lower income in retirement, you win.
You expect lower income in retirement
If you're a high earner now (32% bracket) but plan to retire with modest income (12% bracket), a Traditional IRA lets you defer income recognition to your low-income years. You deduct at 32% and withdraw at 12%, pocketing a 20% arbitrage.
You need the tax deduction today
If you're paying $50,000+ in taxes this year, that $1,680 deduction might push you into a lower bracket or help offset capital gains. The immediate tax savings can be reinvested or used for other financial goals.
You're in a high-cost-of-living state with steep state income tax
In California, New York, or Massachusetts, state income tax can reach 10%+. A Traditional IRA contribution deducts at both federal (24%) and state (10%) rates-a 34% total deduction. Roth offers no such advantage.
The math behind this calculator (click to expand)
Both paths run the same compounding loop on the contribution: balance = contribution * [((1 + r)^n - 1) / r] for the future value of an annuity, where r is the annual return and n is years until retirement. Roth pays tax up front (effectively at the current marginal rate), so the post-tax value at retirement equals the gross balance.
Traditional defers tax to retirement: post-tax value = gross_balance * (1 - retirement_effective_rate). The "apples-to-apples" mode adds a parallel taxable-account leg representing the tax savings from the Traditional deduction, taxed each year on dividends and at capital gains rates on terminal balance. The break-even rate is solved by setting the Roth and Traditional after-tax values equal and isolating retirement_effective_rate.
Implementation by Michael.
The Math Behind the Decision
Let's model both accounts: $7,000/year contributed for 25 years at 7% growth, assuming different tax brackets.
Scenario: 22% tax bracket now, various brackets in retirement
Balance after 25 years: $557,000
Contributions: $175,000
Growth: $382,000
| Retirement Tax Rate | Roth After-Tax Value | Traditional After-Tax Value | Winner |
|---|---|---|---|
| 12% (lower bracket) | $557,000 | $489,160 | Roth +$67,840 |
| 22% (same bracket) | $557,000 | $434,460 | Roth +$122,540 |
| 32% (higher bracket) | $557,000 | $378,760 | Roth +$178,240 |
Note: The Traditional IRA calculation assumes you took a tax deduction at 22%, but with a $175,000 contribution over 25 years, you'd pay a total of $38,500 in taxes upfront (not shown). The after-tax value reflects what you have after withdrawing and paying taxes in retirement.
The takeaway: if you expect your retirement tax bracket to be equal to or higher than your current bracket, Roth wins. If you expect it to be significantly lower, Traditional might edge out Roth (though Roth still often wins due to growth). The biggest Roth advantage comes from decades of tax-free compounding on large account balances.
What might change in the next 24 months
Three pieces of the Roth-vs-Traditional landscape are worth tracking. First, IRS contribution limits are inflation-indexed: $7,000 in 2024 and 2026 ($8,000 with age-50 catch-up). Single phaseout for direct Roth contributions is $150K-$165K MAGI in 2026, MFJ $236K-$246K (per IRS Rev. Proc.). Each November the IRS releases the next year's figures.
Second, the TCJA bracket structure was extended for 2026 but the post-2026 path is the most consequential open question for high earners running this comparison. If TCJA expires and brackets revert (39.6% top rate, narrower 12% bracket), that shifts both your current marginal and your expected retirement effective rate. The break-even calculation needs to be re-run with whichever rate environment is most likely during your withdrawal years, which extends well beyond the 2026 horizon.
Third, SECURE 2.0's RMD age delay (73 / 75 depending on birth year) extends the planning window for Roth conversions in the gap between retirement and the RMD start. That gap is where strategic conversions at lower marginal rates can pull money from Traditional buckets into Roth before RMDs force taxable income upward. The conversion strategy is independent of the contribution decision modeled here, but it interacts with it: the more you have in Traditional at retirement, the more conversion runway matters.
Model Your Own Scenario
Every situation is unique. Use our Roth IRA Calculator to model your own contribution amounts, time horizons, and tax bracket assumptions.
Frequently Asked Questions
Can I have both a Roth and Traditional IRA?
Yes. Your combined contributions across all IRAs (Traditional, SEP, SIMPLE) cannot exceed $7,000 for 2026. So you could contribute $3,500 to Roth and $3,500 to Traditional. However, most people benefit from choosing one strategy and maxing it out.
What are Roth income limits?
For 2026, Roth IRA contributions phase out for single filers between $146,000-$161,000, and for married couples between $230,000-$240,000. If your income exceeds these limits, you can still do a "backdoor Roth" by contributing to a Traditional IRA and immediately converting it. Consult a tax professional if this applies to you.
Can I withdraw from a Roth before 59.5 without penalty?
You can always withdraw your contributions penalty-free. Earnings are subject to a 10% penalty and income tax if withdrawn before 59.5, unless you qualify for an exception (first-time home purchase, disability, etc.). With a Traditional IRA, all withdrawals before 59.5 incur both penalty and income tax unless you qualify for an exception.