What is the pro-rata rule?

The pro-rata rule requires that Roth conversions be taxed proportionally based on the ratio of pre-tax to after-tax funds across all your IRAs. Example: total IRA balance is $100,000 with $6,000 after-tax (6%). Converting $7,000 means only 6% ($420) is tax-free; the remaining $6,580 is taxable. This is the biggest pitfall of the Backdoor Roth strategy.

What are the 2024 Roth IRA income limits?

For 2024: Single filers with MAGI under $146,000 can contribute fully; $146,000-$161,000 partial; over $161,000 cannot contribute directly. Married filing jointly: under $230,000 full; $230,000-$240,000 partial; over $240,000 cannot contribute directly. Those exceeding limits should use the Backdoor strategy.

What are the risks of Backdoor Roth?

Main risks: 1) Pro-rata rule — existing pre-tax IRA balances trigger taxable conversions; 2) Step Transaction Doctrine — IRS could potentially challenge the two-step process (historically not enforced); 3) 5-year rule — conversions withdrawn within 5 years face 10% penalty if under 59.5. Consult a tax professional before proceeding.

Is my data safe with this calculator?

Completely safe. All calculations happen locally in your browser. Your financial data is never uploaded to any server. Works offline.

Backdoor Roth IRA Calculator - Taxes & IRA

Home › Tools › Backdoor Roth IRA Calculator

Analyze the Backdoor Roth IRA strategy for high-income earners. Calculate pro-rata rule impact, conversion tax liability, and long-term Roth advantages.

Zero Dependencies · Works Offline

🔢 Input Parameters

Existing Pre-Tax IRA Balance ($)

Total pre-tax balance across all Traditional/SEP/SIMPLE IRAs (including earnings)

Annual Non-Deductible Contribution ($)

2024 limit: $7,000 ($8,000 if age 50+)

Planned Conversion Amount ($)

Typically equals contribution; larger amounts are taxable

Marginal Tax Rate (%)

Your current federal marginal tax rate

Expected Annual Return (%)

S&P 500 long-term average ~7%

Years to Retirement

Years until expected retirement

🎯 Recommendation
-
Based on pro-rata analysis

📊 After-Tax Ratio

💵 Taxable on Conversion

Federal tax due this year

🟢 Tax-Free Portion

Non-deductible basis portion

📈 Roth Future Value

Estimated at retirement

💰 vs Taxable Account

Advantage over taxable investing

📖 About Backdoor Roth IRA

What is a Backdoor Roth?

The Backdoor Roth IRA is a legal strategy to bypass Roth IRA income limits: make a non-deductible contribution to a Traditional IRA, then immediately convert it to a Roth IRA. Since the contribution was after-tax, the conversion is typically tax-free — provided the pro-rata rule doesn't apply.

Pro-Rata Rule Explained

This is the biggest Backdoor Roth pitfall. If you have existing pre-tax IRA balances (deductible contributions + earnings), the IRS requires proportional taxation on conversions. Formula: taxable ratio = pre-tax IRA balance ÷ (pre-tax balance + after-tax contributions).

Common Ways to Avoid Pro-Rata

Roll existing pre-tax IRA balances into your employer 401(k) plan (if allowed)
Convert all pre-tax IRA balances first, then start fresh with Backdoor
If pre-tax balance is small, convert everything, pay the tax, and start clean

2024 Contribution Limits

Combined Traditional/Roth IRA annual contribution limit: $7,000 under age 50, $8,000 age 50+. The Backdoor strategy uses the Traditional IRA contribution limit; there is no additional limit on conversions.

🚪 Backdoor Roth IRA Calculator

🔢 Input Parameters

📐 Pro-Rata Analysis

📖 About Backdoor Roth IRA

What is a Backdoor Roth?

Pro-Rata Rule Explained

Common Ways to Avoid Pro-Rata

2024 Contribution Limits

🚪 Backdoor Roth IRA Calculator

🔢 Input Parameters

📐 Pro-Rata Analysis

📖 About Backdoor Roth IRA

What is a Backdoor Roth?

Pro-Rata Rule Explained

Common Ways to Avoid Pro-Rata

2024 Contribution Limits

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