Updated April 2026 · IRS Rev. Proc. 2025-32
Traditional IRA vs Roth IRA: The Math Most Sites Get Wrong (2026)
Most guides say “pick Roth if your future tax rate is higher.” That is not wrong, but it misses two critical factors: whether you would reinvest the tax savings from a Traditional deduction, and state-tax arbitrage. We will show you the actual math, then run it for you.
2026 limit under 50
$7,000
Combined Traditional + Roth
2026 limit age 50+
$8,000
+$1,000 catch-up (IRA)
Roth phase-out (single)
$150K-$165K
$236K-$246K for MFJ
The honest answer in 60 seconds
Three numbers determine which IRA wins, not one
The standard advice is: if your tax rate will be higher in retirement, pick Roth; if lower, pick Traditional. This is a useful heuristic but it only accounts for one variable. The actual calculation requires three numbers:
- 1. Your marginal tax rate today determines the value of the Traditional deduction.
- 2. Your expected effective rate on withdrawals in retirement (effective rate, not marginal) determines Traditional’s cost at distribution.
- 3. Whether you would reinvest the Traditional tax savings in a taxable account. If yes, Traditional’s after-tax total grows substantially. Most calculators skip this entirely.
State-tax arbitrage adds a fourth dimension: someone in California today (13.3% state rate) who retires in Florida (0%) gets a 13.3% additional benefit from Traditional that no major brokerage calculator captures. Our calculator includes it.
Side-by-side comparison
Traditional IRA vs Roth IRA: 2026 Feature Comparison
| Feature | Traditional IRA | Roth IRA |
|---|---|---|
| Tax treatment of contributions | Pre-tax (deductible if eligible) | After-tax (no deduction) |
| Tax treatment of qualified withdrawals | Taxed as ordinary income | 100% tax-free |
| 2026 contribution limit (under 50) | $7,000 | $7,000 |
| 2026 contribution limit (50+) | $8,000 (+$1,000 catch-up) | $8,000 (+$1,000 catch-up) |
| 2026 income limit to contribute | None (deductibility phases out) | Single: $150K-$165K, MFJ: $236K-$246K |
| 2026 deductibility phase-out (with workplace plan) | Single: $79K-$89K, MFJ: $126K-$146K | N/A (already after-tax) |
| Required minimum distributions (RMDs) | Yes, begin at age 73 or 75 | None during owner's lifetime |
| Early withdrawal of contributions | Taxable + 10% penalty (exceptions apply) | Anytime, tax-free and penalty-free |
| 5-year rule | N/A | Account open 5 years for tax-free earnings |
| State tax treatment | Many states exempt pension/IRA income | Generally no state tax on qualified withdrawals |
| Estate 10-year rule | 10-year rule for most non-spouse heirs | 10-year rule applies, but tax-free distributions |
| Form 8606 | Required for non-deductible contributions | Required for conversions and distributions |
| Reduces current AGI | Yes, if deductible | No |
Source: IRS Rev. Proc. 2025-32, IRS Pub 590-A/590-B. Green-tinted cells indicate an advantage for that account type. Last verified April 2026.
Quick decision guide
Which IRA is right for you? Three questions
Are you in the 32%+ federal bracket today?
Traditional likely wins. A 32% marginal deduction on $7,000 saves $2,240 in federal tax immediately. You are paying a premium for Roth tax-free growth that may not offset this benefit.
Likely Roth territory. In the 10-22% brackets, the deduction benefit is modest and Roth compounds tax-free over decades.
Will you move from a high-tax to a no-income-tax state in retirement?
Traditional gets a major boost. Contributions deducted at California rates (up to 13.3%) withdrawn in Florida at 0% state tax can add 9-13% to Traditional's total advantage.
State arbitrage is less relevant here. Focus on the federal bracket comparison and the reinvestment question.
Would you actually reinvest the Traditional tax savings?
Traditional gets measurably stronger. At 24%, $7,000 Traditional saves $1,680 in tax per year. Invested in a taxable account at 7% over 30 years, that adds substantially to total wealth.
Roth’s advantage grows. Without reinvestment, the Traditional deduction is consumed as current spending, and Roth’s tax-free compounding is harder to match.
Three worked examples
How different people should think about this
Maya, 28
Teacher, $58K income
22% federal bracket
Maya is near the bottom of her lifetime earnings curve. Her current 22% bracket is likely the lowest she will pay for the next 40 years. She has 37 years for tax-free compounding. Even without reinvesting the deduction savings, Roth delivers more after-tax wealth over her horizon. The no-RMD advantage further tips the scales in Roth's favor.
James, 47
Software engineer, $215K MFJ
32% federal bracket
James is in the 32% bracket today. A $7,000 Traditional deduction saves $2,240 in federal tax immediately. He plans to retire to a lower-income state. His expected retirement income is $80,000, placing him in a 22% bracket in retirement. The 32% deduction today vs 22% tax later plus state-tax arbitrage means Traditional wins clearly.
Linda, 58
Nurse practitioner, $145K
24% federal bracket
Linda is seven years from retirement. Her 24% bracket today versus an expected 22% bracket in retirement makes this close. The $8,000 catch-up contribution is available. Roth's no-RMD flexibility provides an estate-planning tie-breaker. The honest answer requires running the calculator with her specific state taxes and expected Social Security income.
2026 at a glance
Every key number for 2026
IRA limit (under 50)
$7,000
IRA limit (50+)
$8,000
Roth phase-out: single
$150K-$165K
Roth phase-out: MFJ
$236K-$246K
Trad deduction phase-out: single w/ plan
$79K-$89K
Trad deduction phase-out: MFJ w/ plan
$126K-$146K
MFJ spouse-only-covered deduction phase-out
$236K-$246K
Contribution deadline
Apr 15, 2027
Source: IRS Rev. Proc. 2025-32 and IRS Pub 590-A. Last verified April 2026.
When Traditional wins
- +You are in the 32%+ federal bracket today Details →
- +You plan to retire in a lower-tax or no-income-tax state Details →
- +You would reinvest the tax savings in a taxable account Details →
- +Your retirement effective rate will be well below your current marginal rate Details →
- +You want to reduce AGI for ACA subsidies, IRMAA, or child tax credit Details →
- +You are self-employed and want a large pre-tax deduction via SEP-IRA Details →
When Roth wins
- +You are in the 10% or 12% bracket (early career) Details →
- +You expect your retirement tax rate to exceed your current rate Details →
- +You value the no-RMD flexibility for estate planning Details →
- +You want penalty-free access to contributions before age 59.5 Details →
- +You are above the income limit and will use the backdoor Roth Details →
- +You have a long horizon (20+ years) for tax-free compounding Details →
Frequently asked questions
Common Traditional vs Roth IRA Questions (2026)
Is it better to have a Traditional or Roth IRA?+
What is the IRA contribution limit for 2026?+
What income is too high for a Roth IRA in 2026?+
Can I contribute to both a Traditional and Roth IRA?+
At what age do RMDs start on a Traditional IRA?+
What is the backdoor Roth IRA?+
Can I withdraw from a Roth IRA early?+
What happens to my IRA when I die?+
Explore the complete guide
14 pages covering every angle of the Traditional vs Roth decision
Break-Even Calculator
State-tax-aware calculator with tax-savings-reinvested toggle. Find your personal break-even retirement tax rate.
Which IRA by Income
Specific recommendations for low, middle, high, and very high earners with worked dollar examples.
Which IRA by Age
The right choice shifts from your 20s through your 70s. See the full lifecycle decision map.
2026 Contribution Limits
$7,000 under 50, $8,000 at 50+. Combined limit rules, spousal IRA, and the $145k+ myth explained.
Income Limits and Phase-Outs
Complete 2026 Roth phase-out and Traditional deductibility tables with MAGI worked examples.
Backdoor Roth IRA
Step-by-step guide with the pro-rata rule, Form 8606 walkthrough, and broker-specific instructions.
Mega Backdoor Roth
Use your 401(k) to move up to $70,000 into Roth annually. Two plan features you need.
Roth Conversion Strategy
Bracket-filling math, Roth conversion ladder for early retirees, and IRMAA implications.
Withdrawal Rules
Both 5-year clocks explained clearly. All 13 early withdrawal exceptions. SEPP 72(t) deep-dive.
RMD Rules 2026
Age 73 vs 75 by birth year. QCDs up to $115,000. RMD reduction strategies.
Inherited IRA Rules
Post-SECURE 10-year rule with the 2024 annual-RMD clarification. EDB exceptions. Spousal options.
IRA vs 401(k)
The retirement contribution order of operations. Mandatory Roth catch-up rule for $145k+ earners.
Best IRA Providers 2026
Fidelity, Schwab, Vanguard, Robinhood, M1 Finance compared. Robinhood 3% match explained.
Full FAQ
25+ detailed answers to every common Traditional vs Roth question organized by topic.