Roth IRA Calculator — Tax-Free Retirement Growth

How the Roth IRA Calculator Works

This calculator projects the future value of your Roth IRA using annual compound interest on a growing balance of contributions. Each year, your existing balance grows by the assumed return rate, and your annual contribution is added to that growing total. The formula applied is: FV = PV × (1+r)ⁿ + PMT × [((1+r)ⁿ − 1) / r], where FV = future value, PV = current balance, r = annual return rate, n = years to retirement, and PMT = annual contribution.

Worked example: Age 28, current Roth IRA balance $8,000, contributing $7,000/year, 7% average annual return, retiring at 65 (37 years):

• Total contributions: $259,000 ($7,000 × 37 years)
• Projected balance at 65: approximately $1,290,000
• Tax-free growth: ~$1,023,000
• Tax savings vs. Traditional IRA (est. 22% bracket): ~$284,000

The extraordinary power of the Roth IRA is that every dollar of that projected $1.29 million comes out completely tax-free in retirement. With a Traditional IRA, each withdrawal would be taxed as ordinary income — at 22%, that's over $280,000 going to the IRS instead of staying in your pocket.

Roth IRA Contribution Limits 2024–2026

The IRS sets annual contribution limits for Roth IRAs, adjusted periodically for inflation. Understanding these limits is critical for maximizing your tax-free retirement savings:

*2026 limits subject to official IRS announcement. The contribution limit is also capped by your taxable compensation — if you earned only $4,000 in a year, the maximum you can contribute is $4,000, not $7,000.

Phase-out rules: If your Modified Adjusted Gross Income (MAGI) falls in the phase-out range, your contribution limit is reduced proportionally. Above the upper limit, you cannot contribute directly to a Roth IRA. The backdoor Roth IRA (contributing to a Traditional IRA then converting) is a legal workaround for high earners.

Spousal IRA: A non-working spouse can contribute up to the full limit to a Roth IRA based on the working spouse's income, as long as the couple files jointly and the working spouse has enough taxable compensation to cover both contributions.

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

The choice between Roth and Traditional IRA comes down to one key question: Will your tax rate be higher now or in retirement?

When Roth wins: Young people in the 12–22% tax bracket who expect to earn more and pay higher taxes in retirement. Those who want maximum flexibility (no RMDs, penalty-free contribution access). Anyone who wants to leave a tax-free inheritance to heirs.

When Traditional wins: High earners in the 32–37% bracket now who expect to be in 22% or lower in retirement. Those who need the current-year tax deduction to fund contributions.

The tax diversification strategy: Many financial planners recommend holding both Roth and Traditional accounts. In retirement, you can manage your taxable income strategically — drawing from Traditional accounts up to the top of a low bracket, then using Roth funds for the rest, minimizing lifetime tax burden.

Roth IRA Withdrawal Rules and the 5-Year Rule

Understanding Roth IRA withdrawal rules is essential to use the account optimally and avoid unexpected penalties:

Qualified Distributions (Tax-Free & Penalty-Free)

A qualified distribution requires two conditions: (1) The account must be at least 5 years old (from January 1 of the year you first contributed), and (2) you must be at least 59½, disabled, using up to $10,000 for a first home purchase, or deceased.

Non-Qualified Distributions

Your contributions (not earnings) can always be withdrawn tax-free and penalty-free at any age — this is unique to Roth IRAs. However, withdrawing earnings before the 5-year rule and age 59½ triggers income tax plus a 10% penalty on the earnings portion only.

Roth IRA Conversion Rules

You can convert funds from a Traditional IRA or 401(k) to a Roth IRA (a "Roth conversion"). The converted amount is added to your taxable income in the year of conversion. Each conversion starts its own 5-year clock for penalty-free access to that specific converted amount. Strategic conversions in low-income years can shift wealth to Roth at minimal tax cost.

Inherited Roth IRA Rules

Non-spouse beneficiaries must empty an inherited Roth IRA within 10 years of the original owner's death. Unlike inherited Traditional IRAs, distributions from an inherited Roth IRA are still tax-free (assuming the account was at least 5 years old). This makes Roth IRAs one of the most powerful wealth transfer tools available.

Maximizing Roth IRA Returns: Investment Strategy

Where you invest your Roth IRA dollars matters as much as how much you contribute. Since growth is tax-free, prioritize assets with the highest expected long-term returns inside Roth accounts:

• Total market index funds (e.g., VTSAX, VTI): Broadest diversification at lowest cost. The default choice for most investors.
• S&P 500 index funds: Large-cap US equities with a 10% nominal historical return. Simple and battle-tested.
• Small-cap growth ETFs: Higher expected returns mean more tax-free growth over long horizons. Small-cap indexes have historically outperformed large-caps over 20+ years.
• REITs: Dividends are taxed as ordinary income in taxable accounts. Inside a Roth, all REIT dividends grow and distribute completely tax-free.
• High-yield bonds: Interest taxed as ordinary income in taxable accounts. Roth shelters this efficiently.

Use 7% in this calculator as a balanced long-term assumption. Adjust to 5–6% if closer to retirement or risk-averse; 8–9% for an all-equity, decades-long horizon.

Backdoor Roth IRA and Roth 401(k) Comparison

If your income exceeds the Roth IRA phase-out limit (~$161,000 single, ~$240,000 married in 2024), the backdoor Roth is a legal two-step workaround: (1) Make a non-deductible Traditional IRA contribution — no income limit applies; (2) Immediately convert the Traditional IRA to Roth. If you have no other pre-tax IRA funds, the conversion is tax-free. The IRS has explicitly acknowledged this strategy is legal.

Pro-rata rule caution: If you have pre-tax Traditional IRA funds, conversions are partially taxable. Roll pre-tax IRAs into your employer 401(k) first to avoid the pro-rata trap.

Roth IRA vs Roth 401(k):

Optimal combined strategy: Contribute to Roth 401(k) up to the employer match, then max the Roth IRA for its flexibility and broader investment choice, then return to Roth 401(k) for any additional savings above the IRA limit.