Roth IRA Calculator

What Is a Roth IRA Calculator?

A Roth IRA Calculator is a financial planning tool that projects how much a Roth individual retirement account could be worth at retirement. It takes your current balance, annual contribution, expected rate of return, current age, and target retirement age, then compounds those figures year by year. A good Roth IRA projection tool does more than show a single number. It compares the Roth IRA against a regular taxable account, so you can see the estimated dollar value of tax-free growth over time.

The distinction matters because qualified Roth IRA withdrawals are generally tax-free. Once the money is inside the account, dividends, interest, and capital gains accumulate without an annual tax drag as long as distributions meet the qualified distribution rules. A taxable brokerage account faces the opposite reality: every year, a portion of the return may be reduced by taxes on dividends and realized gains. Over 30 or 35 years, that difference compounds into a substantial gap. The Roth IRA Calculator on this page quantifies that gap based on your own inputs.

This tool is designed for anyone who wants a realistic projection rather than a vague guess. Whether you are just opening your first Roth IRA or you have been contributing for years, entering your real numbers into a Roth IRA Calculator gives you a concrete target to plan around.

How the Roth IRA Calculator Works

The math behind this tool follows the same yearly compounding logic that investment accounts use in practice. Here is the step-by-step sequence:

1. Read your starting balances. The calculator begins with whatever amount is already in your Roth IRA. If you enter a separate taxable account starting balance, it uses that figure for the taxable side of the comparison. If you leave it blank, the taxable account starts with the same balance as the Roth IRA so the two projections use identical inputs.
2. Determine the annual contribution. If you check the “Maximize contributions” box, this retirement calculator uses the current IRS limit based on your age: $7,500 for 2026 if you are under 50, or $8,600 if you are 50 or older. If you uncheck the box, you can enter any contribution amount you like. The calculator does not check income phase-outs — verify your eligibility separately.
3. Convert the expected return to a decimal. A 7% expected return becomes 0.07. The calculator applies this rate once per year to the account balance.
4. Project the Roth IRA year by year. At the start of each year, the annual contribution is added to the balance. Then the full balance grows at the expected rate of return. No tax is subtracted at any point.
5. Project the taxable account year by year. The same contribution is added, but the growth rate is reduced by your marginal tax rate. If your expected return is 7% and your tax rate is 22%, the taxable account grows at an effective rate of 7% × (1 − 0.22) = 5.46%. This is a simplified planning model, not an exact tax calculation. Real taxable accounts face different treatment on qualified dividends, ordinary dividends, interest income, and short-term vs long-term capital gains.
6. Track totals. The calculator separately tracks total contributions (principal), total earnings, and the estimated tax drag. For the Roth IRA, the tax drag is always zero. For the taxable account, it is the difference between what the account would have earned tax-free and what it actually earned after tax under the simplified model.
7. Compare and report. The final output includes the projected balance, total contributions, total earnings, estimated tax drag, and the projected balance at retirement for both accounts. The difference is the estimated Roth advantage.

Every figure is derived from your own inputs. Nothing is pulled from a financial institution, and no personal information leaves your browser.

Understanding the Inputs in the Roth IRA Calculator

Each field in the Roth IRA Calculator changes the projection in a specific way. Knowing what each one represents helps you build a realistic scenario.

Roth IRA Current Balance

The amount already invested in your Roth IRA. If you have multiple Roth IRAs, you can combine the balances into a single figure for this projection. This Roth IRA growth calculator treats the total as one account.

Taxable Account Starting Balance

An optional field that lets you compare the Roth IRA against a taxable account that starts with a different balance. If you leave it blank, the taxable account starts with the same balance as the Roth IRA so the two projections use identical inputs. If you want to test a scenario where your taxable account starts empty, enter 0.

Annual Contribution

The amount you plan to add each year. If you check the maximize box, the calculator automatically uses the current IRS limit based on your age. If you prefer to contribute a smaller amount, uncheck the box and enter your own figure. The calculator does not enforce income limits — it is a projection tool, not an eligibility checker. You should verify your eligibility separately using the income phase-out ranges discussed later in this article. If your entered contribution exceeds the standard annual limit for your age, the calculator will display a warning banner but will still run the projection, because some users may have special circumstances such as a spousal IRA or combined-account scenarios.

Expected Rate of Return

The average annual return you expect from your investments. Some long-term planning assumptions use around 7% after inflation, though actual returns vary significantly and past performance does not guarantee future results. Any single year can be far higher or lower than the long-term average. If you invest more conservatively, a lower figure such as 5% or 6% may be more appropriate. This retirement planning tool uses this rate for both accounts, with the taxable account reduced by your tax rate.

Current Age and Retirement Age

These two fields determine the number of compounding years. The calculator loops from your current age up to — but not including — your retirement age. Starting at 30 and retiring at 65 gives 35 years of contributions and growth. Starting at 45 and retiring at 65 gives 20 years. The difference in the final projection is usually dramatic because compounding.

Marginal Tax Rate

Your current federal marginal tax rate. This is used only for the Simplified Taxable Account Estimate. Qualified Roth IRA withdrawals are generally tax-free, so your tax rate does not affect the Roth side of the projection. The taxable account, however, grows at a reduced rate that reflects the estimated annual tax drag. If you are in the 22% bracket, enter 22. Keep in mind that this is a directional model — your real taxable account may hold a mix of assets with different tax characteristics.

2026 Roth IRA Contribution and Income Limits

The IRS adjusts retirement account limits each year for inflation. For the 2026 tax year, the figures are as follows. Always verify these numbers at IRS.gov before relying on them.

• Contribution limit: $7,500 for individuals under age 50. $8,600 for individuals age 50 or older, which includes a $1,100 catch-up contribution.
• Income phase-out for single filers and heads of household: The ability to contribute phases out between $153,000 and $168,000 of modified adjusted gross income (MAGI). Below $153,000, the full contribution is allowed. Above $168,000, no direct contribution is allowed.
• Income phase-out for married couples filing jointly: The phase-out range is $242,000 to $252,000 of MAGI.
• Income phase-out for married couples filing separately: The phase-out range is $0 to $10,000 of MAGI.
• Contribution deadline: For the 2026 tax year, you can make contributions up to the federal tax filing deadline in April 2027.

If your income exceeds the phase-out range, you may still be able to contribute through a backdoor Roth strategy, which involves making a non-deductible traditional IRA contribution and then converting it to a Roth IRA. The Roth IRA Calculator does not model backdoor conversions, but it can project the growth of the resulting Roth balance if you enter the converted amount as your current balance.

The Five-Year Rule and Qualified Distributions

A Roth IRA offers tax-free withdrawals, but only if certain conditions are met. The two requirements for a qualified distribution are the five-year rule and a qualifying event.

The five-year rule requires that five tax years have passed since you first contributed to any Roth IRA. The clock starts on January 1 of the year you make your first contribution. Once you meet the five-year requirement, it never resets, even if you open additional Roth IRAs later.

The qualifying event must be one of the following: you are at least 59½ years old, you are disabled, you are using the withdrawal for qualified first-time home buyer expenses (up to $10,000), or the withdrawal is made by your beneficiary after your death. If both the five-year rule and a qualifying event are satisfied, the entire distribution — contributions and earnings — is tax-free and penalty-free.

Withdrawals that do not meet both requirements are called non-qualified distributions. In that case, the portion of the withdrawal that represents earnings may be subject to income tax and a 10% penalty, though there are exceptions for certain expenses such as higher education, health insurance premiums during unemployment, and birth or adoption expenses. Contributions themselves can always be withdrawn tax-free and penalty-free at any time, because you already paid tax on that money before contributing.

The Roth IRA Calculator assumes a qualified distribution at retirement, which is the most common scenario for long-term retirement savers. If you are planning an early withdrawal, the projection may overstate your after-tax result.

Roth IRA vs Traditional IRA

The choice between a Roth IRA and a traditional IRA comes down to when you want to pay taxes. Traditional IRA contributions may be tax-deductible depending on your income, filing status, and workplace retirement-plan coverage. If deductible, they reduce your taxable income today, and the money grows tax-deferred until you withdraw it in retirement, at which point it is taxed as ordinary income. A Roth IRA works in the opposite direction: you get no deduction today, but qualified withdrawals in retirement are completely tax-free.

Several factors influence which account may be better for you:

• Current tax rate vs expected retirement tax rate. If you expect to be in a lower tax bracket in retirement, a traditional IRA may save you more overall. If you expect to be in a higher bracket, a Roth IRA may be the better choice.
• Age and career stage. Younger workers are often in lower tax brackets and have decades of tax-free compounding ahead, which can make the Roth IRA especially attractive.
• Income limits. Traditional IRA deductions phase out at certain income levels if you or your spouse have a workplace retirement plan. Roth IRA contributions phase out at higher income levels regardless of workplace plan coverage.
• Required minimum distributions. Traditional IRAs require you to start taking distributions at age 73 (or 75 for those born in 1960 or later). Roth IRAs have no required minimum distributions during the owner’s lifetime, which gives you more flexibility in retirement.
• Estate planning. A Roth IRA can be a more efficient asset to leave to heirs because the inherited Roth continues to grow tax-free for the beneficiary, subject to the 10-year distribution rule for most non-spouse beneficiaries.

Many retirement savers end up using both types of accounts to diversify their tax exposure in retirement. The Roth IRA Calculator on this page focuses on the Roth side, but you can use a traditional IRA calculator or a retirement calculator to model the other half of the picture.

Why Tax-Free Compounding Matters Over Decades

The core advantage of a Roth IRA is not a single year of tax savings — it is the compounding effect of never paying tax on growth. In a taxable account, you pay tax on dividends each year, and you pay capital gains tax when you sell investments. Those annual tax payments reduce the amount of money that stays invested, which reduces the base on which future returns compound. Over 30 or 35 years, that small annual reduction becomes a large difference.

This Roth IRA projection models this directly by reducing the taxable account’s growth rate by your marginal tax rate. If you enter a 7% expected return and a 22% tax rate, the taxable account grows at 5.46%. The Roth account grows at the full 7%. The gap between those two rates, applied year after year to an increasing balance, is what produces the estimated Roth advantage shown in the results.

The length of the projection matters enormously. A 20-year projection may show a Roth advantage of a few thousand dollars. A 35-year projection often shows a six-figure advantage. That is why starting early is one of the most powerful decisions a retirement saver can make. Even small contributions made in your 20s have decades to compound tax-free.

Common Mistakes When Using a Roth IRA Calculator

A Roth IRA Calculator is only as useful as the assumptions behind it. Here are some common mistakes to avoid:

• Using an unrealistically high rate of return. A 10% or 12% assumption may look impressive, but it is not a sustainable long-term average for most portfolios. A 6% to 8% assumption is a more common long-term planning range for a diversified stock-heavy portfolio, though actual results will vary.
• Ignoring income limits. The calculator does not check whether you are eligible to contribute. If your MAGI exceeds the phase-out range, you need a different strategy, such as a backdoor Roth conversion.
• Forgetting about contribution limits. The calculator caps contributions at the annual limit when you check the maximize box, but if you uncheck it, you can enter any amount. Entering a figure above the legal limit produces an unrealistic projection. The calculator will display a warning if your contribution exceeds the annual limit for your age, but it will still run the projection because some users may have special circumstances.
• Assuming the tax rate will never change. Tax brackets and rates can change over decades. A 22% marginal rate today may not be your rate in 20 years. The calculator uses a single rate for the entire projection, which is a simplification.
• Treating the projection as a guarantee. Investment returns are not guaranteed. A projection is a planning tool, not a prediction. The actual balance at retirement will depend on market performance, contribution consistency, and future tax law.
• Overlooking inflation. The calculator works in nominal dollars. A projected balance of $1 million in 35 years will not buy what $1 million buys today. If you want a real (inflation-adjusted) projection, use a lower expected return that subtracts an assumed inflation rate.
• Assuming the taxable-account comparison is exact. The calculator reduces the taxable account’s return by a flat tax rate. Real taxable accounts face different treatment on qualified dividends, ordinary dividends, interest income, and short-term vs long-term capital gains. Treat the comparison as directional, not as a precise prediction.

What the Roth IRA Calculator Does Not Include

This Roth IRA tool is a planning tool, and like all planning tools it has boundaries. The following items fall outside its scope:

• Income eligibility checks. The calculator does not verify whether your MAGI falls within the Roth IRA phase-out range. You need to check that separately using IRS guidelines.
• Backdoor Roth conversions. The pro-rata rule and conversion mechanics are not modeled. If you use the backdoor strategy, the calculator can project the converted balance but not the conversion process itself.
• Contribution deadline timing. The calculator assumes contributions are made at the start of each year. In reality, you might contribute monthly, quarterly, or as a lump sum before the April deadline. The timing can affect the final balance slightly.
• Taxes on withdrawals. The calculator assumes qualified distributions with no tax. If you withdraw before age 59½ or before the five-year rule is satisfied, taxes and penalties may apply.
• State income taxes. The calculator uses a single marginal tax rate for the taxable account. State income taxes, which vary widely, are not included.
• Required minimum distributions. Roth IRAs do not require distributions during the owner’s lifetime, so the calculator does not model RMDs. Traditional IRAs do have RMDs, but that is a separate calculation.
• Investment fees and expenses. Expense ratios, advisory fees, and trading commissions reduce actual returns. The calculator uses a net expected return that you provide, so you should reduce your expected return by your estimated fees before entering it.
• Exact taxable-account tax treatment. The calculator uses a flat tax drag on the taxable account. Actual tax treatment depends on asset type, holding period, and individual tax situation.

Tips for Getting the Most Out of Your Roth IRA

If the projection from this calculator looks promising, a few practical steps can improve your odds of reaching the target:

• Contribute early in the year. Money contributed in January has almost 12 more months to compound than money contributed the following April. Over decades, that timing difference adds up.
• Automate your contributions. Setting up automatic monthly transfers removes the need for willpower and ensures you do not miss a year of contributions.
• Invest the contributions. A Roth IRA is a container, not an investment. Money sitting in cash inside the account does not grow. Choose a diversified portfolio that matches your risk tolerance and time horizon.
• Keep fees low. Index funds and ETFs typically carry much lower expense ratios than actively managed funds. Lower fees mean more of your return stays in the account.
• Review your projection annually. Your income, tax rate, and investment returns will change over time. Rerunning this projection tool each year keeps your plan aligned with reality.
• Consider a spousal Roth IRA. If you are married and your spouse has little or no earned income, a spousal Roth IRA allows you to contribute based on the working spouse’s income, subject to the same contribution limits and income phase-outs.
• Do not withdraw early. Roth IRAs are most powerful when left alone to compound. Withdrawing contributions early reduces the base that future growth is built on.
• Verify the current IRS limits every year. Contribution limits and income phase-outs are adjusted annually. Before you contribute, check the current figures at IRS.gov or ask a tax professional.

Limitations of a Roth IRA Projection

This Roth IRA projection tool produces a useful estimate when the inputs are reasonable, but a few limitations are worth stating plainly:

• It assumes a constant rate of return. Actual markets do not deliver smooth returns every year. A projection with a steady 7% return is a simplification, not a forecast.
• It assumes a constant contribution. Most people increase their contributions over time as their income grows. The calculator uses a single annual contribution for the entire projection.
• It assumes a constant tax rate. Tax law and personal tax situations change. A single marginal rate is a planning convenience, not a prediction.
• It uses a simplified taxable-account model. The comparison between the Roth IRA and the taxable account is directional, not exact. Real tax treatment on dividends, interest, and capital gains is more complex than a single rate.
• It is a snapshot. Contribution limits, income phase-outs, and tax rules change periodically. Rerunning the calculator after each change keeps the projection current.

Even with those caveats, a Roth IRA Calculator gives you something most retirement savers lack: a clear, numeric view of what tax-free compounding could produce over time and how much the Roth advantage is worth in dollar terms.