The Roth IRA Calculator projects how post-tax contributions can grow inside a Roth IRA and what a qualified withdrawal might look like under a stated return. Enter current balance, contribution amount, years invested, and assumed return, and the Roth IRA Calculator returns an ending balance path so the growth of after-tax savings is visible in dollars.
A Roth IRA takes contributions after tax; qualified withdrawals of contributions and earnings are generally tax-free under current rules. That structure differs from a Traditional IRA, where contributions may be deductible and withdrawals are taxed as ordinary income. Contribution limits and income phase-outs change; confirm the current tax year with official IRS sources or a tax professional before funding an account.
*These results are estimates for information only, not financial, tax, or retirement advice. Contribution limits, income phase-outs, and tax rules change; confirm current IRS rules and personal eligibility.*
Calculate your Roth IRA growth
The Roth IRA Calculator calculates Roth IRA growth by compounding a starting balance and regular contributions at an assumed return over the years entered. Growth answers how large the account becomes before any withdrawal, under a constant-rate path chosen for planning clarity.
Future value of the starting balance is FV = PV x (1 + i)^n. Future value of contributions uses the ordinary annuity future-value formula at the same rate. Adding both pieces gives the projected ending balance. Example: $20,000 already in the account, $500 contributed each month, 7% annual return, and 20 years produces a much larger ending balance than contributions alone, because compound growth acts on both the opening sum and each deposit.
Real markets do not deliver a smooth 7% every year. The Roth IRA Calculator uses a constant rate so the arithmetic is transparent; stress-test lower rates before treating one run as the plan.
Grow contributions tax-free
The Roth IRA Calculator frames contributions as post-tax money that can grow and, if withdrawals are qualified, leave the account without income tax on earnings under current rules. Tax-free growth is the feature that separates a Roth from taxable brokerage compounding when tax on gains and dividends would otherwise apply each year or at sale.
Contributions themselves were already taxed as income when earned. The planning question is whether future earnings escape tax at withdrawal. A simplified illustration: $6,000 contributed once, growing at 6% for 25 years, becomes about $25,751 before any further deposits. In a Roth path, that ending balance is the planning figure for a qualified withdrawal. In a taxable account at the same pre-tax return, after-tax proceeds would be lower once tax on gains is applied, depending on rates and holding period.
Qualification rules (age, holding period, and related conditions) are set by tax law and can change. The Roth IRA Calculator does not certify that a withdrawal is qualified; it projects balances under the growth assumptions entered.
Compare a Roth and a Traditional IRA
The Roth IRA Calculator compares a Roth and a Traditional IRA by holding contribution habit and return constant while changing when tax is paid. Roth vs Traditional is a tax-timing decision: pay tax on contributions now and seek tax-free qualified withdrawals later, or seek a deduction now and pay tax on withdrawals later.
A compact comparison uses the same $6,000 annual contribution for 20 years at 7%. On the Roth side, contributions are after tax, so the worker must earn more than $6,000 pretax to fund each $6,000 deposit when tax is owed currently. On the Traditional side, a deductible contribution can leave more cash in the paycheck today, but withdrawals are taxed. If the tax rate at contribution equals the tax rate at withdrawal, the after-tax outcomes often converge in textbook models; if the withdrawal-rate is higher than today's rate, Roth often looks better on after-tax spending; if the withdrawal-rate is lower, Traditional often looks better.
The Roth IRA Calculator shows the balance paths; it does not invent future tax brackets. For account mechanics shared across IRA types, the IRA Calculator on QuickCalculators covers Traditional and Roth modes on the same contribution engine. Use this page for the dedicated Roth keyword view and that page when switching account types in one tool.
Check the contribution limit and phase-out
The Roth IRA Calculator checks planning against contribution limits and income phase-outs by letting the user enter a contribution and compare it with the current-year ceiling. The contribution limit is an annual dollar cap set by the IRS; high earners can face a reduced or zero Roth direct-contribution limit through an income phase-out.
Limits change by tax year and sometimes by age (catch-up contributions). The Roth IRA Calculator does not hard-code a permanent dollar limit as law; treat any default in the interface as an editable planning input and confirm the official figure for the year of the contribution. Phase-out ranges also move with inflation adjustments. Someone whose modified adjusted gross income sits in the phase-out band may contribute only a partial amount, or none, directly to a Roth IRA.
Indirect funding strategies exist under current law for some households that cannot contribute directly. Those strategies carry their own rules and tax reporting. Model only what the household will actually fund, and confirm eligibility before counting a contribution in a retirement plan.
Frequently asked questions
How does a Roth IRA grow?
A Roth IRA grows when contributions and existing balances earn a return inside the account. The Roth IRA Calculator compounds those inputs at the assumed rate over the years entered. Qualified withdrawals of growth are generally tax-free under current rules; confirm qualification conditions separately.
What is the difference between a Roth and a Traditional IRA?
A Roth uses after-tax contributions and generally tax-free qualified withdrawals. A Traditional IRA may allow deductible contributions with taxable withdrawals. The Roth IRA Calculator holds return and contribution habit constant so the tax-timing difference is the main variable. Future tax rates are unknown; compare scenarios rather than one assumed bracket.
Do Roth IRA contribution limits change?
Yes. The IRS sets annual contribution limits and income phase-outs that can change each tax year. The Roth IRA Calculator treats limits as planning inputs. Confirm the current official limit and phase-out before contributing.
What is an income phase-out for Roth contributions?
An income phase-out reduces or eliminates the amount that can be contributed directly to a Roth IRA once modified adjusted gross income exceeds published ranges. The Roth IRA Calculator does not replace IRS worksheets. Check current ranges for the tax year in question.
Are Roth IRA withdrawals always tax-free?
Qualified withdrawals of contributions and earnings are generally tax-free under current rules when age and holding-period conditions are met. Non-qualified withdrawals can trigger tax and penalties on earnings. The Roth IRA Calculator projects balances; it does not determine qualification.
How does this relate to the IRA Calculator?
The IRA Calculator on QuickCalculators supports Traditional and Roth modes on a shared contribution engine. This page is the dedicated Roth keyword page. Cross-link both when comparing account types or checking contribution mechanics.
Are investment returns guaranteed?
Investment returns are not guaranteed. The Roth IRA Calculator applies the rate entered as a constant for clear arithmetic. Test lower returns and longer or shorter horizons before locking a savings plan to one figure.
Summary
The Roth IRA Calculator compounds a Roth balance and contributions at an assumed return so ending balances are visible in dollars, then frames growth as post-tax money that can leave tax-free when withdrawals are qualified under current rules.
Comparing Roth and Traditional IRAs is mainly a tax-timing choice: equal tax rates often converge in simple models, while higher future rates favor Roth and lower future rates favor Traditional on after-tax spending.
Contribution limits and income phase-outs change by tax year, so every limit in the tool is a planning input to confirm with official IRS figures. Pair this page with the IRA Calculator when switching account types in one workflow. These results are estimates for information only, not tax or retirement advice.