Roth IRA Calculator
Project your tax-free balance at retirement — and see how much the Roth wrapper saves compared with the same investing in a taxable account.
Why tax-free growth compounds differently
In a taxable account, taxes on dividends and gains skim a slice of every year's return, and that slice never gets to compound. In a Roth, the full return compounds every year and the IRS never takes a cut at the end:
Taxable (approx.): effective return ≈ return × (1 − tax rate)
Age 30 → 65 · $10,000 start · $7,000/yr at 7%:
Roth balance ≈ $1.1M, all withdrawable tax-free. The same contributions in a taxable account (15% drag on returns) end near $890,000 — the wrapper alone is worth over $200,000.
Same $7,000/yr at 7%, but starting at age 45 instead of 30, with $0 already saved, to the same retirement age of 65 (20 years instead of 35):
Future value of an annuity: FV = 7,000 × [(1.07²⁰ − 1) ÷ 0.07] = 7,000 × 40.995 ≈ $287,000. Total contributed over 20 years: $140,000, so growth accounts for about $147,000 of the total.
Compare that to the age-30 starter's ≈$1.1M: the 15-year head start is worth roughly $800,000 more at retirement, even though the late starter contributed the same $7,000 every year they participated — most of the gap is simply compounding having fewer years to work.
Common Roth IRA mistakes
- Contributing above the income phase-out without realizing it. Excess contributions face a 6% excise tax each year until corrected — check your MAGI against the current-year limits before contributing directly.
- Withdrawing converted funds within 5 years of the conversion. Even though the conversion itself was taxed, an early withdrawal of that converted amount can still trigger the 10% penalty if the 5-year conversion clock hasn't finished.
- Underestimating how much a late start costs. As the example above shows, delaying 15 years cuts the ending balance by more than two-thirds, even with identical annual contributions.
2025 contribution limits and income rules
| Rule (2025) | Amount |
|---|---|
| Contribution limit (under 50) | $7,000 |
| Contribution limit (50+) | $8,000 |
| Single phase-out begins (MAGI) | $150,000 |
| Married filing jointly phase-out begins | $236,000 |
Above the phase-out, the "backdoor Roth" (nondeductible traditional contribution converted to Roth) remains a standard, legal workaround — mind the pro-rata rule if you hold pre-tax IRA money. Roths also skip required minimum distributions entirely, making them the best account to inherit and the last one to spend. Sequence-wise, most planners put Roth contributions right after capturing the 401(k) match. See the accumulation big picture in the retirement calculator.
Frequently asked questions
How much can I contribute to a Roth IRA?
2025: $7,000/yr ($8,000 at 50+), phasing out from $150k MAGI single / $236k joint. Backdoor conversions may work above that.
Why is a Roth IRA so powerful?
All growth is tax-free at withdrawal; $7,000/yr for 30 years at 7% ≈ $660,000 with zero owed. Contributions stay accessible penalty-free.
Roth IRA or traditional IRA?
Roth if your retirement tax rate will match or beat today's; traditional at peak brackets. Roth's no-RMD flexibility is a strong tiebreaker.
Can I withdraw my contributions before retirement?
Yes — contributions (already taxed) can be withdrawn anytime, tax- and penalty-free. Only early withdrawal of earnings risks tax and a 10% penalty.
What is the Roth IRA 5-year rule?
Tax-free earnings withdrawal needs both age 59½+ and 5 years since opening the account; each conversion also has its own separate 5-year clock.
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Note: Limits and phase-outs are for tax year 2025 and change annually; the taxable comparison is approximate. Not financial or tax advice. Last reviewed: September 2026.