Roth IRA Calculator

Worked example

Example: age 40, single, MAGI $90,000, contributing $7,500 in 2026 at 7% for 25 years projects tax-free growth well above total contributions. Raise MAGI into the phase-out and the eligible contribution shrinks automatically.

How it works

Projects Roth IRA balance from current savings, contributions, expected return, and years. Applies IRS annual limits (with age 50+ catch-up) and simplified MAGI phase-out ranges by filing status for 2025/2026. Contributions above the eligible amount are clamped with a warning. Annual or monthly contribution modes are supported; monthly amounts are annualized for limit checks and spread monthly for compounding.

Limitations

Results are estimates for educational purposes and are not financial advice. Contribution limits, income rules, taxes, and fees are simplified or omitted. Consult a qualified financial professional for personal guidance.

Privacy and file handling

Your data stays on your device and is not uploaded.

Accuracy & methodology

This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.

Formula source or methodology

Future value of current balance plus annual contributions with compound growth at the stated return.

Jurisdiction

United States

Unit system

US dollars; percent; years

Rounding method

Currency amounts round to two decimal places (half up via Math.round × 100 / 100).

Assumptions

• Contributions once per year
• Tax-free growth (Roth framing only; no tax math performed)
• Constant return

Known omissions

• Not tax, legal, investment, or lending advice. Confirm material decisions with qualified professionals.
• 2026 IRS contribution limits ($23,500 elective deferral; $7,500 catch-up age 50+; $70,000 combined annual additions under §415(c)) — limits are not enforced in the model
• Employer match annual caps, true-up provisions, and vesting schedules
• Plan administrative fees and fund expense ratios
• Inflation adjustment of future dollars (nominal dollars only unless stated)
• Income tax on withdrawals (pre-tax vs Roth treatment)
• Required minimum distributions (RMDs) and early withdrawal penalties
• IRS Roth IRA income limits and annual contribution caps are not enforced
• Backdoor Roth or pro-rata rules

Test cases (automated)

• Valid balance, contribution, return, and years yield a projection
• Negative contribution is rejected

Version & last verified

Logic version 1.0. Content and formulas last verified 2026-07-24.