Roth IRA Calculator

What Is a Roth IRA and Why Does It Matter?

A Roth IRA (Individual Retirement Account) is one of the most powerful wealth-building tools available to American investors. Unlike a Traditional IRA or 401(k), a Roth IRA is funded with after-tax dollars, meaning you pay taxes on the money before it goes in. In exchange, every dollar it earns grows completely tax-free, and withdrawals in retirement are 100% tax-free. No taxes on the growth, no taxes when you take the money out, no required minimum distributions (RMDs) forcing you to withdraw money you don't need.

For a 25-year-old contributing $7,000 per year at a 7% average annual return, the Roth IRA balance at age 65 would be approximately $1.48 million. Of that, roughly $280,000 is money contributed. The other $1.2 million is pure investment growth, and none of it will ever be taxed. That tax-free compounding over 40 years is why financial advisors consistently rank the Roth IRA as one of the best retirement vehicles available.

The Roth IRA was created by the Taxpayer Relief Act of 1997, named after Senator William Roth of Delaware. Since its introduction, it has become the go-to retirement account for younger workers, those who expect to be in a higher tax bracket in retirement, and anyone who values flexibility, since contributed principal can be withdrawn at any time without penalty.

2025 Roth IRA Contribution Limits

For 2025, the IRS allows contributions of up to $7,000 per year for individuals under age 50. Those aged 50 and older may contribute an additional $1,000 "catch-up" amount, bringing their limit to $8,000 per year. These limits apply to your total IRA contributions, if you contribute to both a Roth and a Traditional IRA in the same year, the combined total cannot exceed these limits.

2025 Roth IRA Income Limits

Not everyone is eligible to contribute to a Roth IRA directly. The IRS phases out contribution eligibility based on your Modified Adjusted Gross Income (MAGI). For 2025, the phase-out ranges are:

Roth IRA vs Traditional IRA: Which Is Better for You?

The fundamental question is: will you be in a higher or lower tax bracket in retirement than you are today? If you expect to be in a higher bracket in retirement, because you're young and your income will grow, or because you'll have substantial taxable income from other sources, the Roth wins. You pay taxes now at a lower rate and withdraw tax-free later at what would have been a higher rate. If you expect to be in a lower bracket in retirement, the Traditional IRA's upfront deduction may give you more net value.

For most people in their 20s and early 30s who are still climbing the income ladder, the Roth IRA is the clear winner. The math is compelling: paying 12–22% taxes today to avoid paying 24–32% taxes on a much larger amount in retirement is an excellent trade. The tax-free compounding advantage magnifies over time, every dollar of growth in a Roth is worth more than a dollar of growth in a taxable or Traditional account because it never gets a tax haircut.

Beyond the Tax Rate Question: Other Roth Advantages

• No Required Minimum Distributions (RMDs). Traditional IRAs and 401(k)s force you to withdraw money starting at age 73, whether you need it or not, creating a taxable event. Roth IRAs have no RMDs, giving you complete control over when and how much you withdraw. This is especially valuable for those who have other income in retirement and don't need to tap the account.
• Tax diversification. Having both pre-tax (Traditional/401k) and after-tax (Roth) retirement accounts gives you flexibility to manage your tax situation in retirement. You can draw from whichever account minimizes your tax bill in any given year.
• Principal withdrawal flexibility. You can withdraw the money you contributed to a Roth IRA at any time, for any reason, without taxes or penalties. Only the earnings are subject to the 5-year rule and age requirements. This makes the Roth IRA a useful secondary emergency fund for disciplined savers.
• Estate planning benefits. Inherited Roth IRAs pass tax-free to beneficiaries. For wealth transfer purposes, a Roth IRA is far more valuable to heirs than a Traditional IRA loaded with deferred taxes.

When Traditional IRA Wins

The Traditional IRA makes more mathematical sense when your current tax rate is meaningfully higher than your expected retirement rate. This is most common for high earners in peak income years (late 40s–50s), people who will have significantly less income in retirement, or those who plan to retire in a low-tax state after working in a high-tax state. It also makes sense if you need the upfront tax deduction for cash flow reasons, sometimes the certain benefit today outweighs the uncertain benefit in the future.

Roth IRA Investment Strategy: What to Put Inside

Because the Roth IRA shelters growth from taxes permanently, you want your highest-return, highest-growth assets inside it. The tax-free compounding advantage is greatest on assets that would otherwise generate the most taxable events, dividends, capital gains distributions, and long-term growth. Put your most aggressive investments in the Roth IRA; save your bonds and conservative holdings for taxable accounts where the tax drag is lower.

For most investors, low-cost index funds are the ideal Roth IRA investment, and the evidence overwhelmingly supports this approach over active stock picking or high-fee managed funds. A total stock market index fund (like VTSAX or VTI) provides broad diversification, minimal fees (expense ratios under 0.05%), and maximum long-term growth potential. Over 30–40 years, the difference between a 0.03% expense ratio fund and a 1% expense ratio fund inside a Roth IRA can amount to hundreds of thousands of dollars of additional tax-free balance at retirement. That 0.97% drag compounds just as relentlessly as your returns, only in the wrong direction.

Where to Open a Roth IRA

The major brokerage firms all offer Roth IRAs with no account minimums and access to low-cost index funds. Fidelity and Schwab offer zero-expense-ratio index funds alongside excellent educational resources. Vanguard invented the index fund and remains the low-cost benchmark. Betterment and Wealthfront offer automated portfolio management (robo-advisor) Roth IRAs for those who prefer a hands-off approach. All are reputable, SIPC-insured, and appropriate for Roth IRA investing.

Frequently Asked Questions