What is Traditional IRA vs. Roth IRA Calculator [US] and How Do You Calculate It?
Compare after-tax terminal wealth of Roth vs Traditional IRAThis standardized equation forms the quantitative foundation used by chartered financial analysts (CFA), investment bankers, and corporate treasurers under GAAP and IFRS reporting frameworks.
Formula Components & Operational Definitions
Annual ContributionSubject to US IRS IRA limits ($7,000 in 2024).
Current Tax Rate (%)Tax rate paid on income today.
Retirement Tax Rate (%)Estimated tax rate during retirement withdrawals.
Step-by-Step Real-World Worked Example
A US worker in the 24% bracket expects to retire in the 15% bracket in 25 years with $7,000 annual IRA contributions at 8% returns.
Strategic Takeaway: When your current tax rate is significantly higher than your expected retirement rate, Traditional tax deferral wins.
Industry Benchmark Comparison Table
The decision between Roth and Traditional hinges entirely on comparing your current tax rate vs your future retirement tax rate.
Take deduction at high current rates, withdraw at low future rates.
Pay low taxes today, enjoy 100% tax-free withdrawals forever.
Executive Sector Note: Roth IRAs have no Required Minimum Distributions (RMDs) during the owner’s lifetime and pass tax-free to heirs.
Analytical Comparison & Critical Limitations
- US IRS tax code specific; subject to annual income phaseout thresholds.
Frequently Asked Questions
What is the main difference between Traditional and Roth IRA?
Traditional IRA contributions are tax-deductible today but taxed upon withdrawal in retirement. Roth IRA contributions are made with after-tax money, but all qualified withdrawals in retirement are 100% tax-free.