Roth IRA Calculator 2026
$7,000/year at 7% for 40 years = $1.49M completely tax-free. Check your contribution limits and compare Roth vs Traditional IRA.
How to Use This Calculator
Tab "Tax-Free Growth"
Enter your current age, retirement age, current Roth IRA balance, annual contribution, and expected annual return. The calculator projects your Roth IRA balance at retirement using compound interest. All growth is tax-free at withdrawal (after age 59½ and the 5-year rule). Expand the year-by-year table to see how your balance grows each year.
Tab "Contribution Limits"
Enter your filing status, age, and Modified Adjusted Gross Income (MAGI). The calculator checks whether you qualify for the full $7,000 contribution (or $8,000 if 50+), a reduced amount within the phase-out range, or zero. If your MAGI exceeds the limit, it suggests the Backdoor Roth IRA strategy. The exact phase-out formula is shown so you can verify the math.
Tab "Roth vs Traditional"
Compare the after-tax value of a Roth IRA vs Traditional IRA at retirement. Enter your annual contribution, years to retirement, expected return, current tax rate, and expected retirement tax rate. The calculator shows both accounts growing side-by-side: Roth contributions are after-tax but withdraw tax-free, while Traditional contributions are pre-tax but taxed at withdrawal. The winner depends on whether your retirement tax rate is higher or lower than today.
The Formulas
FV = P × (1 + r)n + C × (((1 + r)n − 1) / r) × (1 + r)
Where: P = current balance, C = annual contribution, r = annual return rate, n = years
Roth IRA Phase-Out (reduced contribution):
Reduced limit = Full limit × ((Phase-out ceiling − MAGI) ÷ Phase-out range)
Single: $7,000 × (($165,000 − MAGI) ÷ $15,000)
MFJ: $7,000 × (($246,000 − MAGI) ÷ $10,000)
Result rounded down to nearest $10 (minimum $200)
Roth vs Traditional comparison:
Roth after-tax value = FV (all tax-free at withdrawal)
Traditional after-tax value = FV × (1 − retirement tax rate)
Roth wins when: retirement tax rate ≥ current tax rate
Example
$7,000/year — Age 25 to 65, 7% Return
Contributing the maximum $7,000 per year from age 25 to 65 at a 7% average return produces approximately $1.50M. You put in $280,000 over 40 years, and compound interest generates over $1.2M in tax-free growth. At a 15% retirement tax rate, a Traditional IRA with the same contributions would be worth only $1.27M after taxes — the Roth saves you roughly $225,000 in this scenario. The key insight: the earlier you start, the more powerful tax-free compounding becomes.