📈IRA Calculator

Our IRA calculator settles the Traditional vs Roth debate with a direct after-tax comparison using your actual tax rates. The choice between a Traditional IRA and a Roth IRA is fundamentally a question about tax timing: pay taxes now at your current rate (Roth), or pay them later at your retirement rate (Traditional). This Traditional vs Roth IRA comparison calculator shows the exact after-tax dollar difference between the accounts across any combination of current and retirement tax rates, contribution amounts, and time horizons.

Traditional IRA: How the Tax Deduction Works

A Traditional IRA allows you to contribute pre-tax dollars (up to the annual limit) that reduce your current taxable income. The contribution limit for 2024 is $7,000 per year ($8,000 for individuals age 50 or older). For a taxpayer in the 24% marginal federal bracket contributing $7,000, the deduction saves $1,680 in federal taxes in the year of contribution. State income tax savings add further benefit in states with income taxes.

The deduction is subject to income limits if you or your spouse also have access to a workplace retirement plan (401(k), 403(b), etc.). For 2024, the deduction phases out for single filers with workplace plan coverage between $77,000 and $87,000 in modified adjusted gross income (MAGI), and for married filing jointly between $123,000 and $143,000. Contributions beyond the phase-out are allowed but not deductible (called "non-deductible Traditional IRA contributions"), and those dollars create a "basis" that is not taxed again at withdrawal — but tracking and documenting this basis is administratively complex.

All Traditional IRA growth compounds tax-deferred — no annual capital gains taxes, no dividend taxes owed in the current year. At retirement, every dollar withdrawn (contributions and all earnings) is taxed as ordinary income. This creates a compounding tax deferral during the accumulation phase but a large deferred tax liability at retirement. Required Minimum Distributions (RMDs) beginning at age 73 force withdrawals regardless of income needs, which can push retirees into higher tax brackets if other retirement income is also high.

Roth IRA: Why Tax-Free Growth Is Uniquely Powerful

A Roth IRA is funded with after-tax dollars — you pay income tax on the contribution in the year it is made, then all subsequent growth and withdrawals are permanently tax-free. The 2024 contribution limit is the same $7,000 ($8,000 age 50+), but income limits apply to direct Roth IRA contributions: for 2024, the phase-out for single filers is $146,000–$161,000 MAGI; for married filing jointly, $230,000–$240,000.

The tax-free growth advantage of a Roth IRA compounds dramatically over long time horizons. An investor contributing $7,000 per year from age 25 to 65 at a 7% return accumulates approximately $1.5 million in a Roth IRA — and pays zero tax on any withdrawal. The same contributions in a Traditional IRA accumulate the same gross balance, but at a 20% retirement tax rate, $300,000 of that balance is owed in taxes. The Roth advantage is essentially the permanent elimination of the future tax liability on all investment returns — a liability that grows exponentially with the portfolio.

Roth IRAs have two additional advantages over Traditional IRAs worth noting. First, there are no RMDs during the owner's lifetime — you are never forced to withdraw, which makes the Roth an excellent estate planning vehicle for passing tax-free assets to heirs. Second, Roth contributions (not earnings) can be withdrawn at any time penalty-free, providing an emergency flexibility not available with Traditional IRA funds.

The Backdoor Roth IRA: For High-Income Earners

High-income earners above the Roth IRA income limits can access Roth IRA benefits through the "Backdoor Roth IRA" strategy: contribute to a non-deductible Traditional IRA (available at any income level), then immediately convert the balance to a Roth IRA. Because the contribution was non-deductible (after-tax), the conversion triggers tax only on any earnings between contribution and conversion — which is near-zero if done promptly.

The Backdoor Roth strategy has been in common use since 2010 when the income limit on Roth conversions was eliminated. It provides the same tax-free growth and withdrawal benefits as a direct Roth contribution. Households with access to 401(k) mega backdoor Roth provisions can contribute even more after-tax dollars — potentially up to $69,000 total in 2024 across all contribution types. These strategies are worth examining with a tax professional for high-income households who have maximized other tax-advantaged options. Use our retirement calculator for broader retirement income projections beyond IRA accounts.

When Traditional IRA Beats Roth: The Tax Rate Math

The Traditional IRA produces a higher after-tax outcome when your retirement tax rate is materially lower than your current marginal rate. This scenario is most common for: mid-career professionals in their peak earning years (32–37% brackets now, expecting to drop to 22–24% in retirement on a lower income); retirees with limited Social Security and no pension income; and individuals planning to spend down a Traditional IRA aggressively in early retirement before RMDs begin.

The breakeven is: if your retirement tax rate equals your current tax rate, Traditional and Roth produce identical after-tax outcomes (assuming the same marginal rate applies to the full balance). At equal rates, both accounts are mathematically equivalent and the choice is a question of flexibility and preference rather than return optimization. When uncertainty about future tax rates is high — as it is today given federal fiscal challenges — many advisors suggest a blend of Traditional and Roth to hedge against different outcomes. "Tax diversification" across account types provides optionality to draw from whichever account is tax-advantaged in any given retirement year. Pair this calculator with our 401(k) calculator to model the combined picture across all retirement accounts.