Roth IRA vs. Traditional IRA: Which Is Better?
Last verified: July 19, 2026 against IRS Notice 2025-67 + Publications 590-A and 590-B (current guidance)
Reviewed by Josh for financial modeling and data. See more by Josh.
When a Traditional IRA contribution is deductible, the core comparison is the marginal rate the deduction saves today versus the effective rate paid on future taxable withdrawals. The calculator can add invested deduction savings to the Traditional side and lets you specify how much of the contribution is actually deductible. That matters because workplace-plan coverage and MAGI can reduce or eliminate the deduction even though the IRA contribution itself is still allowed.
Calculator: Which one wins for you?
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2026 IRA limit: $7,500 ($8,600 if 50+)
e.g. age 35 retiring at 65 = 30
7% is an illustrative real-return assumption, not a forecast
Federal plus any applicable state tax savings
Total tax / total income in retirement
Use 0% if no deduction; use the deductible share for a partial deduction
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)
- You want to hedge the possibility that your future tax rate will be higher
- You're early in your career and your income (and bracket) will climb
- You value flexibility: Roth IRA owners have no lifetime RMDs; inherited-account distribution rules still apply to beneficiaries
- You want optionality at retirement to manage IRMAA / ACA subsidy thresholds by mixing Roth and Traditional withdrawals
- You're maxing the shared limit and want to place more after-tax wealth inside the IRA, while accepting the upfront tax cost
Pick Traditional if you believe...
- Your retirement effective rate will be LOWER than the marginal rate a deduction saves today
- You'll likely retire to a no-income-tax state (FL, TX, WY, NV, etc.)
- You qualify for a deduction and will use the tax savings intentionally
- You plan to do Roth conversion ladders in low-income years (sabbatical, between jobs, early retirement) - convert at lower brackets later
- You're in a peak-earnings year and still have tax-deductible Traditional IRA access
- You expect a lower effective rate on withdrawals than the marginal rate saved today
Show year-by-year math
| Year | Roth balance | Trad pre-tax | Tax-savings sidecar | Trad after-tax total |
|---|
Method: Apples-to-apples mode invests the tax savings from the deductible share of the Traditional contribution in a simplified taxable sidecar. The model reduces the sidecar's assumed return by 15% as a rough tax-drag proxy; it is not a tax-lot simulation. Nondeductible Traditional basis is not taxed again in the retirement value, but real-world Form 8606 and pro-rata rules aggregate Traditional, SEP, and SIMPLE IRAs. Both modes assume year-end contributions and constant rates. The calculator does not test compensation eligibility or enforce the Roth MAGI phaseout.
What the break-even rate actually means
The break-even rate is the retirement effective tax rate at which the modeled Roth value equals the modeled Traditional value plus any invested deduction savings. Below it, Traditional leads; above it, Roth leads. The result depends on the deductible percentage, sidecar tax-drag proxy, and the assumption that rates stay constant. Naive mode omits deduction savings and is not an equal-after-tax-cost comparison when a deduction is available.
Pre-tax balances can create required minimum distributions, generally beginning at age 73 for people born from 1951 through 1959 and age 75 for people born in 1960 or later. RMDs, a surviving spouse's filing status, and a move between states can all change the effective rate on withdrawals. They are scenario inputs, not reasons to presume one account type will win.
The useful review process is to run more than one future-rate scenario, check whether the Traditional IRA deduction is actually available, and revisit the result when income or workplace-plan coverage changes. A close result supports tax diversification; it does not imply a fixed 50/50 recommendation.
Key Differences at a Glance
| Feature | Roth IRA | Traditional IRA |
|---|---|---|
| Tax treatment now | No deduction. You pay taxes first. | May be fully, partly, or not deductible, depending on workplace-plan coverage, filing status, and MAGI. |
| Tax treatment in retirement | Qualified distributions are tax-free; nonqualified earnings may be taxable. | Generally taxable as ordinary income except for recovered after-tax basis. |
| 2026 contribution limit | $7,500 ($8,600 if 50+) | $7,500 ($8,600 if 50+) |
| Income limits | Direct contributions phase out with MAGI. | No income ceiling on contributing, but the deduction can phase out when the filer or spouse has workplace-plan coverage. |
| Required Minimum Distributions (RMDs) | None during your lifetime. | Generally age 73 (born 1951-1959) or 75 (born 1960+). |
| Early withdrawal (before 59.5) | Regular contributions come out first; conversions and earnings have separate rules. | Generally taxable except for basis, plus a possible 10% additional tax unless an exception applies. |
When a Roth IRA Wins
You're in a low tax bracket now
If your next deductible dollar would save 12% in federal tax, choosing a $7,500 Roth contribution instead of a fully deductible Traditional contribution gives up as much as $900 of current federal tax savings. That trade can be reasonable if you expect the dollars to face a higher rate when withdrawn, but salary alone does not determine the bracket or deduction.
You expect higher income (and higher tax brackets) in retirement
Pension income, Social Security, RMDs, and other withdrawals can raise the rate applied to Traditional distributions. If the rate paid later is higher than the marginal rate a full deduction saved today, the Roth side can lead under otherwise equal assumptions. Future rates and income are uncertain, so test more than one scenario.
You have a long time horizon (20-40+ years)
At an illustrative 7% annual return, one $7,500 contribution grows to about $80,074 over 35 years before fees. In a Roth, that growth is tax-free only when the distribution is qualified. In a Traditional IRA, withdrawals are generally taxable except for basis. Both accounts compound at the same assumed rate; time magnifies the dollar tax difference, not which tax rate is better.
You want tax-free growth without being forced to withdraw
Traditional IRAs require lifetime RMDs beginning at the applicable age, generally 73 or 75 based on birth year. Roth IRA owners do not have lifetime RMDs, but beneficiaries are subject to inherited-account distribution rules.
You want flexibility (Roth conversion ladder)
A Roth conversion ladder can move Traditional IRA money to Roth in lower-income years, creating taxable income at conversion. Separate five-year and distribution-ordering rules apply, so it can help some early retirees manage the period before age 59.5 but does not automatically avoid every tax or penalty.
When a Traditional IRA Wins
You're in a high tax bracket now
A high marginal rate can make a deduction valuable only when the contribution is deductible. In 2026, a single filer covered by a workplace plan receives no Traditional IRA deduction at $91,000 or more of MAGI. If a full deduction is available, a $7,500 contribution at a 24% marginal rate saves $1,800 of federal tax; if it is not available, that savings is $0.
You expect lower income in retirement
A fully deductible contribution made at a 32% marginal rate and later withdrawn at a 12% effective rate has a favorable 20-point rate spread before considering investment of the deduction, state taxes, benefit interactions, and future law. The projected rates must actually occur; the spread is not guaranteed.
You need the tax deduction today
A deductible contribution reduces taxable income; it does not directly offset capital gains dollar-for-dollar. Its value is the deduction multiplied by the applicable marginal rates, subject to the Traditional IRA deduction rules.
You're in a high-cost-of-living state with steep state income tax
State treatment can materially change the comparison, but it is not uniform. Check whether your state follows the federal IRA deduction and how it taxes later distributions before adding a state-rate benefit to the model.
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 on deductible contributions and earnings. The model preserves entered nondeductible basis, applies the retirement rate only to the remaining taxable amount, and adds a sidecar for tax savings from the deductible share. The sidecar's return is reduced by a fixed 15% tax-drag proxy; the model does not calculate dividends, tax lots, or terminal capital gains separately. The break-even rate sets the Roth value equal to the Traditional after-tax value plus that sidecar.
Implementation by Michael.
The Math Behind the Decision
This worked example contributes $7,500 at each year-end for 25 years at an illustrative 7% return. It assumes a fully deductible Traditional contribution, a 22% current marginal rate, and invests the tax savings in the model's taxable sidecar.
Scenario: 22% tax bracket now, various brackets in retirement
IRA balance after 25 years: $474,368
IRA contributions: $187,500
IRA growth: $286,868
Tax-savings sidecar: $89,892
| Retirement Tax Rate | Roth After-Tax Value | Traditional After-Tax Value | Winner |
|---|---|---|---|
| 12% (lower bracket) | $474,368 | $507,336 | Traditional +$32,968 |
| 22% (same bracket) | $474,368 | $459,899 | Roth +$14,469 |
| 32% (higher bracket) | $474,368 | $412,462 | Roth +$61,906 |
Traditional values include the $89,892 tax-savings sidecar and subtract the stated retirement rate from the pre-tax IRA balance. The sidecar uses the simplified 15% return haircut described above. It is illustrative, not a forecast or tax return calculation.
The takeaway is conditional: with a full deduction and the tax savings invested, Traditional can lead when the withdrawal rate is below the modeled break-even; Roth can lead above it. Growth does not independently favor Roth because the same IRA contribution compounds at the same assumed rate in both accounts.
What might change in the next 24 months
Three pieces of the Roth-vs-Traditional landscape are worth tracking. First, the 2026 shared IRA contribution limit is $7,500 under age 50 and $8,600 with the age-50 catch-up. Direct Roth contributions phase out at $153,000-$168,000 single and $242,000-$252,000 MFJ. The IRS generally publishes the next year's inflation-adjusted figures in the fall.
Second, the One Big Beautiful Bill Act (July 2025) made the TCJA bracket structure permanent, so the old expiration cliff is gone - but permanence in tax law only means "until Congress changes it." Deficit pressure over a 30-year withdrawal horizon is the real variable. The break-even calculation needs to be re-run with whichever rate environment you consider most likely during your withdrawal years, which extends well beyond today's schedule.
Third, SECURE 2.0's RMD age rules - generally 73 for people born from 1951 through 1959 and 75 for those born in 1960 or later - may extend the planning window for conversions between retirement and the RMD start. A conversion creates taxable income and can affect other tax thresholds, so lower-income years are planning opportunities, not an automatic recommendation.
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 2026 contributions to Traditional and Roth IRAs cannot exceed $7,500 if under 50 or $8,600 with the age-50 catch-up. You can split that shared limit between the two account types. SEP and SIMPLE IRA plan contributions have separate rules.
What are Roth income limits?
For 2026, direct Roth IRA contributions phase out between $153,000 and $168,000 for single and head-of-household filers, and between $242,000 and $252,000 for married couples filing jointly. Married filing separately has a separate $0-$10,000 range when the spouses lived together during the year. A nondeductible contribution followed by a conversion may be available, but review the pro-rata rule and Form 8606 first.
Is a Traditional IRA contribution always deductible?
No. For 2026, the deduction phases out at $81,000-$91,000 of MAGI for single or head-of-household filers covered by a workplace plan, and at $129,000-$149,000 for married filing jointly when the contributor is covered. If the contributor is not covered but their spouse is, the joint range is $242,000-$252,000. Other filing and coverage rules apply.
Can I withdraw from a Roth before 59.5 without penalty?
Roth IRA ordering rules treat regular contributions as distributed first, and those contributions can generally be withdrawn tax- and penalty-free. Conversions and earnings have separate rules. Traditional IRA distributions are generally taxable except for recovered basis and may face a 10% additional tax before 59.5 unless an exception applies.