Roth IRA vs Traditional IRA: Quick Answer
If you expect your tax rate to be the same or higher in retirement, a Roth IRA is generally better because you pay taxes now at a known rate and withdraw tax-free later. If you expect a significantly lower tax rate in retirement, a Traditional IRA’s upfront deduction provides more value. Most retirees benefit from having both types for withdrawal flexibility.
For Arizona residents specifically, the state’s 2.5% flat income tax rate makes Roth IRAs and Roth conversions particularly attractive — you’ll pay one of the lowest state tax rates in the country on contributions or conversions.
Side-by-Side Comparison
| Feature | Roth IRA | Traditional IRA |
|---|---|---|
| Tax treatment | Contribute after-tax; withdraw tax-free | Contribute pre-tax (may be deductible); withdrawals taxed as income |
| 2026 contribution limit | $7,000 ($8,000 if 50+) | $7,000 ($8,000 if 50+) |
| Income limits | Phase-out begins at $161K single / $240K married | No income limit for contributions (deductibility may be limited) |
| Tax deduction | No upfront deduction | May be fully or partially deductible |
| Withdrawal taxation | Tax-free (qualified) | Taxed as ordinary income |
| Required Minimum Distributions | None during owner’s lifetime | Begin at age 73 (or 75 if born 1960+) |
| Early withdrawal penalty | Contributions: no penalty anytime. Earnings: 10% penalty before 59½ | 10% penalty before 59½ on all withdrawals |
| 5-year rule | Earnings tax-free only after 5 years + age 59½ | No 5-year rule |
| Contribution age limit | None (with earned income) | None (with earned income, since SECURE Act) |
| Arizona state tax | No tax on qualified withdrawals | Taxed at 2.5% flat rate |
| Impact on Social Security taxation | Withdrawals don’t count toward combined income | Withdrawals increase combined income, may trigger SS taxation |
| Impact on Medicare IRMAA | Withdrawals don’t affect IRMAA | Withdrawals count toward MAGI, may increase premiums |
| Best for | Younger savers, those expecting higher future taxes, tax-free legacy | Higher earners wanting current deduction, those expecting lower retirement tax rates |
Which IRA Is Right for You? Decision Matrix
| Your Situation | Best Choice | Why |
|---|---|---|
| In a low tax bracket now, expect higher taxes later | Roth IRA | Pay taxes at today’s lower rate; withdraw tax-free in a higher bracket |
| In a high tax bracket now, expect lower taxes in retirement | Traditional IRA | Deduction saves more now than the tax you’ll pay later |
| Retiring in Arizona from a high-tax state | Roth IRA (or Roth conversion) | Lock in Arizona’s 2.5% state tax rate on contributions or conversions |
| Earning above Roth income limits | Backdoor Roth IRA | Contribute to Traditional (non-deductible), convert to Roth immediately |
| Want to leave a tax-free inheritance | Roth IRA | Heirs inherit tax-free; Traditional IRA heirs owe income tax |
| Need to reduce this year’s taxable income | Traditional IRA | Deductible contributions lower your AGI |
| Want to avoid Required Minimum Distributions | Roth IRA | No RMDs during owner’s lifetime; Traditional IRA RMDs begin at 73 |
| Retiring before 73 with a gap before RMDs | Both | Use the gap years to convert Traditional to Roth at low tax rates |
| Unsure about future tax rates | Both | Tax diversification lets you choose the best account to withdraw from each year |
When a Roth IRA Is Better
You Expect Higher Tax Rates in Retirement
If federal tax rates increase (a possibility given budget deficits and the scheduled expiration of Tax Cuts and Jobs Act provisions after 2025) or your retirement income will push you into higher brackets, paying taxes now at a known rate is advantageous.
You Want Tax-Free Income in Retirement
Roth IRA withdrawals don’t count as taxable income, which means they:
- Don’t trigger taxation of Social Security benefits
- Don’t increase Medicare IRMAA premiums
- Don’t push you into higher tax brackets
- Provide tax diversification alongside taxable and tax-deferred accounts
You Want to Avoid RMDs
Roth IRAs have no Required Minimum Distributions during the owner’s lifetime. This is valuable if you don’t need the money and want to let it continue growing tax-free, or if you plan to leave it as a tax-free inheritance.
You’re Early in Your Career
Younger savers in lower tax brackets pay less tax on Roth contributions now, and the tax-free growth over decades compounds significantly.
You’re an Arizona Resident Considering Conversions
Arizona’s 2.5% state tax rate means converting a Traditional IRA to a Roth costs only 2.5% at the state level. For someone who moved from California (up to 13.3%), this represents a 10.8% state-level savings on the conversion amount.
When a Traditional IRA Is Better
You Need the Tax Deduction Now
If you’re in a high tax bracket during your working years and expect a significantly lower bracket in retirement, the upfront deduction saves more than the eventual tax on withdrawals.
Your Income Is Too High for Roth IRA Contributions
If your MAGI exceeds Roth IRA limits ($161K single / $240K married for 2026), direct Roth contributions aren’t available. You can still contribute to a Traditional IRA (though it may not be deductible) and potentially use the backdoor Roth IRA strategy.
You’re Close to Retirement and in a High Bracket
If you’ll retire within 5-10 years and your retirement income will be substantially lower, the deduction-now / tax-later approach provides a net benefit.
The Case for Having Both
Most retirees benefit from having both Roth and Traditional accounts. This provides “tax diversification” — the ability to choose which account to withdraw from based on your tax situation each year.
For example, in a year when you have high income (capital gain event, RMD year, pension lump sum), you can supplement with tax-free Roth withdrawals. In a low-income year, you can draw from traditional accounts and stay in a low bracket.
Arizona-Specific Considerations
- Roth conversions at 2.5%: Arizona’s low flat tax makes Roth conversions more cost-effective than in most states
- No Social Security tax: Since Arizona doesn’t tax Social Security, the benefit of Roth withdrawals not counting toward SS taxation is primarily a federal advantage
- Gap-year strategy: Arizona retirees who retire before age 73 can convert Traditional IRA funds at the combined low federal + 2.5% state rate before RMDs begin
- Community property: In Arizona, IRA assets acquired during marriage may be considered community property, affecting beneficiary planning and divorce situations
Tax Impact Comparison: $100,000 Over 25 Years
This table illustrates how the same $100,000 grows differently depending on which IRA type you choose, assuming a 7% average annual return, a 22% federal tax bracket during contributions, and a 22% bracket during withdrawals.
| Factor | Roth IRA | Traditional IRA |
|---|---|---|
| Pre-tax contribution | $128,205 gross income needed | $100,000 gross income needed |
| Amount invested | $100,000 (after paying $28,205 in taxes) | $100,000 (pre-tax, deducted) |
| Value after 25 years (7% return) | $542,743 | $542,743 |
| Taxes owed at withdrawal (22%) | $0 | $119,404 |
| Net after-tax value | $542,743 | $423,339 |
| Effective tax paid | $28,205 (on contributions) | $119,404 (on withdrawals) |
Key insight: When tax rates are equal, the Roth IRA produces the same after-tax result if you invest the tax savings from the Traditional IRA separately. The Roth wins when future tax rates are higher; the Traditional wins when future rates are lower.
Frequently Asked Questions
Can I contribute to both a Roth and Traditional IRA?
Yes, but the combined contribution limit is $7,000 ($8,000 if 50+) across all IRAs. You can split contributions between a Roth and Traditional IRA in any proportion, as long as the total doesn’t exceed the annual limit.
Can I convert a Traditional IRA to a Roth IRA?
Yes. There are no income limits or caps on Roth conversion amounts. You’ll pay income tax on the converted amount in the year of conversion (at both federal and Arizona’s 2.5% rate). This strategy is particularly valuable during lower-income years.
Which IRA is better for leaving to heirs?
A Roth IRA is generally superior for inheritance. Beneficiaries inherit Roth IRAs tax-free (they must withdraw within 10 years under the SECURE Act, but no taxes are due). Traditional IRA beneficiaries also face the 10-year rule but must pay income tax on all withdrawals.
What is a backdoor Roth IRA?
A backdoor Roth IRA is a two-step strategy for high earners: contribute to a Traditional IRA (non-deductible), then immediately convert it to a Roth IRA. This is legal and widely used, but the pro-rata rule applies if you have existing pre-tax Traditional IRA balances — potentially making a portion of the conversion taxable.
Sources: IRS Publication 590-A and 590-B, SECURE Act of 2019, SECURE 2.0 Act of 2022, Arizona Department of Revenue.