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⚙ Calculator coming soon — use the information below to calculate manually.
The choice between Roth and Traditional IRA comes down to one question: will your tax rate be higher now or in retirement? Traditional IRA gives you a tax deduction today but you pay taxes when you withdraw in retirement. Roth IRA gives you no deduction today but all withdrawals in retirement are completely tax-free — including decades of growth.
| Situation | Winner |
|---|---|
| You expect higher tax rate in retirement | Roth IRA |
| You expect lower tax rate in retirement | Traditional IRA |
| Same tax rate now and retirement | Equal |
| Young, low income today | Roth IRA |
| Peak earning years, high tax rate now | Traditional IRA |
| Income above Roth limit ($161K single 2026) | Traditional or Backdoor Roth |
Both Roth and Traditional IRA share the same annual contribution limit: $7,000 if under age 50, or $8,000 if age 50 or older (catch-up contribution). This is a combined limit — you cannot contribute $7,000 to each. The 2026 income limit to contribute directly to Roth IRA phases out between $146,000–$161,000 for single filers and $230,000–$240,000 for married filing jointly.
Invest $500/month for 30 years at 8% average return. Final balance: approximately $745,000. Traditional IRA: you saved ~$45,000 in taxes during contributions (assuming 20% average rate) but owe 20% tax on $745,000 withdrawal = pay $149,000 in taxes. Net: $596,000 + $45,000 saved earlier = $641,000. Roth IRA: $745,000 completely tax-free. Roth wins by $104,000 in this scenario. However, if your rate drops to 12% in retirement, Traditional wins. The math is highly personal.
Use this calculator as a starting point, not a final answer. Run three scenarios: pessimistic (lower returns, higher costs, worst-case tax rates), base case (your expected scenario), and optimistic (favorable conditions). The range between these three scenarios tells you how much uncertainty surrounds your plan and how much buffer you need.
Once you have your numbers, cross-reference them with complementary calculators. A mortgage payment should be checked against your overall budget and DTI ratio. A retirement projection should account for Social Security income, potential pension, and healthcare costs in retirement. Tax calculations should be checked against available deductions and credits you may qualify for. No single calculator captures everything.
Where you hold investments matters as much as what you hold. High-growth assets belong in Roth accounts where growth is tax-free. Income-producing assets like bonds belong in traditional 401(k) or IRA where taxes are deferred. Tax-managed index funds belong in taxable brokerage where you can harvest losses. This asset location strategy adds 0.2-0.4% annually to after-tax returns without changing your investments at all.
The lifetime value of proper tax planning for a median American household is approximately $150,000-300,000 in additional wealth at retirement — the difference between tax-smart and tax-naive investment management over 30 years. Most of this benefit comes from three decisions made once: choosing the right account types, maximizing employer match, and selecting low-cost index funds.
For retirement and tax calculations specifically, consider running this calculation once per year as your income, tax brackets, and contribution limits change. The IRS adjusts dozens of thresholds annually for inflation — limits that applied in 2023 differ meaningfully from 2026 figures. Bookmark this page and revisit each January after the new limits are announced.
Finally, remember that financial optimization is a long game. Improving your savings rate by 5%, reducing investment fees by 0.5%, and claiming every eligible deduction compound over decades into very large differences in final wealth. Small improvements made consistently outperform dramatic one-time decisions every time.