IRA Calculator 2026 — Traditional vs. Roth (Side-by-Side Comparison)

How IRA Calculator Works

Roth: FV = Balance × (1+r)^n + PMT[((1+r)^n − 1) / r] → tax-free | Traditional: Same FV × (1 − tax%)

Both account types grow identically. The only difference is when taxes are paid. Roth = pay tax now (contribution is after-tax), never again. Traditional = deduct now, pay tax on every dollar withdrawn at your future rate. If your tax rate is the same now and later, the result is mathematically identical.

Current vs. Future Tax Rate

Now vs. Retirement — If your current marginal rate is higher than your retirement effective rate, Traditional wins (deduct now at high rate, pay later at low rate). If lower now, Roth wins (pay now at low rate, withdraw tax-free later). The breakeven rate shown in results tells you the tipping point.

Breakeven Rate

The Decision Point — If your retirement effective rate is below this percentage, Traditional wins. Above it, Roth wins. Find your breakeven and compare against your estimated retirement rate.

Contribution Limit

2026 IRS Combined Limit — $7,000 (under 50) or $8,000 (50+) applies to the total of Traditional + Roth IRA contributions. You can split any way between the two types.

How to Use

1. Enter your current age and target retirement age to set the investment window.
2. Enter your combined current IRA balance (Traditional + Roth) and planned annual contribution.
3. The calculator enforces the 2026 IRS limit of $7,000 (under 50) / $8,000 (50+).
4. Select your current marginal tax rate — this determines the Traditional IRA deduction benefit.
5. Estimate your effective tax rate in retirement — this is the critical variable. Most retirees have effective rates of 10–15%.
6. The breakeven rate shows the exact retirement tax rate at which Traditional and Roth are equal.

Quick Reference

Common Uses

• •Compare the after-tax retirement value of a Traditional IRA versus a Roth IRA based on your current tax rate and estimated retirement tax rate.
• •Determine the breakeven retirement tax rate at which Traditional and Roth IRAs produce the same after-tax outcome.
• •Plan annual contributions across both IRA types to create tax diversification and optimize your retirement withdrawal strategy.

Understanding the Result

The Traditional vs. Roth IRA decision comes down to one question: is your tax rate higher now or in retirement? If you pay $7,000/year into a Traditional IRA at a 22% marginal rate, you save $1,540 in taxes this year. That tax savings can be invested elsewhere. In retirement, every dollar withdrawn from the Traditional IRA is taxed as ordinary income. A Roth IRA skips the upfront deduction in exchange for completely tax-free withdrawals. The math is identical when current and future tax rates are the same — meaning the Roth advantage is purely a bet on future tax rates being higher. Most financial advisors suggest Roth for young professionals in low brackets, Traditional for peak earners in high brackets, and a mix for those who want tax diversification.

Worked Examples

Frequently Asked Questions

Can I have both a Traditional and Roth IRA?

Yes — the 2026 contribution limit of $7,000 (under 50) / $8,000 (50+) is a combined limit across all IRA accounts. You could contribute $4,000 to Traditional and $3,000 to Roth, for example. Having both provides tax diversification in retirement: you can withdraw from Traditional up to the standard deduction amount (tax-free) and supplement with Roth (also tax-free).

How do I know what my retirement tax rate will be?

Most retirees withdraw enough to fill the lower brackets. In 2026, the standard deduction is $15,000 (single) / $30,000 (MFJ) — that much income is tax-free. To reach the 22% bracket in retirement as a single filer, you would need over $60,000 in taxable withdrawals. For most people, the effective tax rate in retirement is 10–15%. Use the breakeven rate shown in the results: as long as your expected retirement rate is below the breakeven, Traditional wins.

Does the Traditional IRA tax deduction phase out?

Yes — if you (or your spouse) have access to a workplace retirement plan (401k), the Traditional IRA deduction is phased out at higher incomes. For 2026: single filers covered by a workplace plan: $79,000–$89,000 MAGI phase-out. MFJ (both covered): $126,000–$146,000. MFJ (one covered): $236,000–$246,000 for the non-covered spouse. Roth IRA income phase-outs are separate and higher.

What is a Backdoor Roth IRA?

If your income exceeds the Roth IRA direct contribution limits (single > $165,000, MFJ > $246,000 in 2026), you can still contribute via the "backdoor" strategy: contribute to a non-deductible Traditional IRA, then immediately convert to Roth. There is no income limit on Roth conversions. If you have no existing pre-tax Traditional IRA balance, the conversion is effectively tax-free. This is a common strategy for high-income earners.

What are Required Minimum Distributions (RMDs)?

Traditional IRA accounts require you to begin taking Required Minimum Distributions (RMDs) starting at age 73 (as of 2025 under SECURE 2.0 Act). RMDs are calculated based on your life expectancy factor from the IRS Uniform Lifetime Table and are taxed as ordinary income. Roth IRAs do not have RMDs during the original owner's lifetime, which is one of their most valuable long-term advantages. RMDs can push retirees into higher tax brackets, making Roth conversions before age 73 worth considering.

Pro Tips

• →If you expect your income to rise significantly later in your career (doctors, lawyers, tech workers), fund a Roth IRA early while you are in a lower bracket. Once you cross into the 32%+ bracket, the math strongly favors Traditional — but you cannot undo years of missed Roth contributions.
• →The "tax diversification" strategy: split your contributions between Traditional and Roth IRAs (e.g., $3,500 in each if under 50). In retirement, withdraw from Traditional to fill the low brackets (0%, 10%, 12%) and use Roth for any spending above that — minimizing your lifetime tax bill regardless of future rate changes.
• →The Traditional IRA tax deduction savings should be invested, not spent. If your $7,000 Traditional contribution saves you $1,540 in taxes (at 22% rate) and you invest that $1,540 in a taxable brokerage account, your Traditional IRA outcome significantly outperforms Roth over time. Failing to invest the tax savings is the most common mistake in the Roth vs. Traditional decision.
• →If your income exceeds the Roth IRA phase-out limits, the Backdoor Roth IRA strategy is available: contribute to a non-deductible Traditional IRA and immediately convert to Roth. There is no income limit on Roth conversions. Be aware of the "pro-rata rule" — any existing pre-tax Traditional IRA balances will trigger taxable conversion amounts proportional to your total IRA balance.

Limitations to Know

• •Traditional IRA deductions phase out at higher incomes for those covered by a workplace retirement plan. In 2026: single filers covered by a workplace plan phase out at $79,000-$89,000 MAGI; MFJ (both covered) at $126,000-$146,000. This calculator does not check income phase-out eligibility — it assumes your Traditional IRA contribution is fully deductible.
• •Roth IRA contributions phase out at higher incomes regardless of workplace plan coverage. In 2026: single filers phase out at $150,000-$165,000 MAGI; MFJ at $236,000-$246,000. Above these thresholds, you may need the Backdoor Roth IRA strategy, which is not modeled here.
• •The calculator assumes a constant annual return, which real markets never deliver. Sequence-of-returns risk — a bear market in the years just before or during early retirement — can significantly reduce the final balance compared to the smooth growth projection shown here.
• •Projections do not account for Required Minimum Distributions (RMDs) starting at age 73 (SECURE 2.0 Act) for Traditional IRAs, which force taxable withdrawals and may push retirees into higher brackets. Roth IRAs have no RMDs during the original owner's lifetime, a significant long-term advantage not reflected in simple balance comparisons.