Backdoor Roth IRA Calculator

Calculate how to do a backdoor Roth IRA contribution — the strategy high earners use to contribute to a Roth IRA even when income exceeds the direct contribution limits. Estimate future tax-free growth.

Current Traditional IRA Balance (pre-tax balance)

Enter the total pre-tax balance in all Traditional IRA accounts (including SEP and SIMPLE IRAs).

MAGI (Modified Adjusted Gross Income)

Your Modified Adjusted Gross Income for the year.

Filing Status

Tax Year

Your Age

Expected Retirement Age

Expected Annual Return (%)

Average annual return assumption (e.g., 7% for stock market).

Tax Rate at Withdrawal (%)

Your expected marginal federal tax rate in retirement.

📋 Your Backdoor Roth IRA Results

Roth IRA Direct Contribution Eligibility

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Recommended Backdoor Contribution Amount

$7,000

This is the maximum you can contribute for your age and then convert to Roth IRA.

Traditional IRA Balance at Retirement (Pre-Tax)

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If you leave it in a Traditional IRA (no conversion).

Roth IRA Balance at Retirement (Tax-Free)

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After conversion — all future growth is tax-free.

💰 Estimated Tax Savings with Backdoor Roth

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📝 Step-by-Step Backdoor Roth IRA Process

Contribute to a Traditional IRA

Make a non-deductible contribution to a Traditional IRA. Since your income exceeds the Roth IRA direct contribution limits, you cannot deduct this contribution on your taxes.

Convert to Roth IRA

Convert the Traditional IRA balance to a Roth IRA. You'll pay income tax only on any pre-tax portion of the conversion (the pro-rata rule). The non-deductible basis converts tax-free.

Report on Your Tax Return

File Form 8606 with your tax return to report the non-deductible contribution and the conversion. This tracks your basis so you don't pay tax on it again.

Enjoy Tax-Free Growth

Once in the Roth IRA, your investments grow tax-free. Qualified withdrawals in retirement (after age 59½) are completely tax-free, including all earnings.

⚠️ Disclaimer: This calculator provides educational estimates only. Backdoor Roth IRA strategies can have complex tax implications, especially under the pro-rata rule if you have existing pre-tax Traditional IRA balances. Consult a qualified tax professional before executing any conversions. Tax laws may change — always verify current year limits with the IRS.

Backdoor Roth IRA Examples

Example 1: High Earner, No Existing Traditional IRA

Situation: Sarah, age 35, single, MAGI of $220,000 (2026). She has no existing Traditional IRA balance. She wants to contribute to a Roth IRA.

MAGI: $220,000 (exceeds 2026 single phase-out range of $150,000–$165,000)
Direct Roth eligibility: None (ineligible)
Existing Traditional IRA balance: $0
Solution: Contribute $7,000 non-deductible to Traditional IRA, then convert to Roth IRA

✅ Result: Since she has no pre-tax Traditional IRA balance, the full $7,000 converts tax-free. No pro-rata rule applies. Future growth is entirely tax-free.

Example 2: High Earner with Existing Traditional IRA (Pro-Rata Rule)

Situation: David, age 42, married filing jointly, MAGI of $400,000 (2026). He has a Traditional IRA with a $50,000 pre-tax balance. He wants to do a backdoor Roth.

MAGI: $400,000 (exceeds 2026 MFJ phase-out range of $236,000–$246,000)
Direct Roth eligibility: None
Existing Traditional IRA balance: $50,000 (all pre-tax)
Contribution: $7,000 non-deductible to Traditional IRA
Total IRA after contribution: $57,000 ($50,000 pre-tax + $7,000 basis)

Pro-rata calculation: When converting $7,000 to Roth IRA, the taxable portion is $7,000 × ($50,000 ÷ $57,000) = $6,140.35. Only $859.65 converts tax-free.

⚠️ Result: David owes tax on ~$6,140 of the conversion at his marginal rate. To avoid this, he could roll the pre-tax IRA into a 401(k) first if his employer plan allows it.

Example 3: Married Couple, Both Doing Backdoor Roth

Situation: Tom and Lisa, both age 38, married filing jointly, MAGI of $300,000 (2026). Neither has an existing Traditional IRA. Each wants to contribute the maximum.

MAGI: $300,000 (exceeds MFJ phase-out, neither can contribute directly to Roth IRA)
Each contributes: $7,000 non-deductible to their own Traditional IRA
Each converts: $7,000 to their own Roth IRA
Total backdoor Roth contribution: $14,000 per year

✅ Result: Both convert fully tax-free with no pro-rata issues. Over 27 years (to age 65), assuming 7% returns, each Roth IRA grows to approximately $484,000 — all tax-free. Combined: ~$968,000 tax-free.

⚠️ Important: The pro-rata rule considers all your Traditional, SEP, and SIMPLE IRA balances combined. If you have any pre-tax IRA money, you cannot convert only the non-deductible portion — every conversion is a blend of pre-tax and after-tax money. Rolling pre-tax IRA balances into a 401(k) is a common strategy to avoid this.

Backdoor Roth IRA: Formula & Guide

How the Backdoor Roth IRA Works

The backdoor Roth IRA is a legal strategy that allows high-income earners to contribute to a Roth IRA indirectly. Since you cannot contribute directly to a Roth IRA when your MAGI exceeds the income limits, you instead:

Make a non-deductible contribution to a Traditional IRA (no income limits apply)
Convert that Traditional IRA to a Roth IRA (again, no income limits)
Pay tax only on the pre-tax portion of the conversion at conversion time
All future growth in the Roth IRA is tax-free

Roth IRA Income Limits (2026)

Filing Status	Full Contribution	Phase-Out Range	Ineligible
Single	MAGI < $150,000	$150,000 – $165,000	MAGI > $165,000
Married Filing Jointly	MAGI < $236,000	$236,000 – $246,000	MAGI > $246,000

2025 limits: Single ($150K–$165K), MFJ ($236K–$246K). Same as 2026.

Pro-Rata Rule Formula

If you have existing pre-tax Traditional IRA balances, the taxable portion of any conversion is calculated as:

Taxable Portion = Conversion Amount × (Pre-Tax IRA Balance ÷ Total IRA Balance)

Where:

Conversion Amount = The amount you convert from Traditional IRA to Roth IRA
Pre-Tax IRA Balance = Total of all Traditional, SEP, and SIMPLE IRA balances that have not been taxed (excluding your basis)
Total IRA Balance = Pre-tax balance + your non-deductible basis (after-tax contributions)

Key insight: You cannot choose to convert only the non-deductible portion. Every conversion is a proportional blend of pre-tax and after-tax money.

Future Value Calculation

The future value of the Roth IRA (tax-free) and Traditional IRA (pre-tax) at retirement is calculated using the standard future value formula:

FV = PV × (1 + r)^n

Where:

FV = Future value at retirement
PV = Present value (contribution amount)
r = Annual return rate (decimal form)
n = Number of years until retirement

For Roth IRA: The full FV is available tax-free. For Traditional IRA: The after-tax value = FV × (1 − tax_rate_at_withdrawal).

Tax Savings Formula

The tax savings from using a backdoor Roth IRA vs. leaving money in a Traditional IRA is:

Tax Savings = Roth FV − [Trad FV × (1 − withdrawal_tax_rate)]

This captures the benefit of tax-free growth in the Roth IRA compared to tax-deferred growth in the Traditional IRA (where withdrawals are taxed at your future income tax rate).

⚠️ Important Considerations:

The pro-rata rule applies to ALL Traditional, SEP, and SIMPLE IRAs combined — not just the account you convert from.
If your employer offers a 401(k) that accepts incoming rollovers, you can roll pre-tax IRA balances into the 401(k) to avoid the pro-rata rule.
The 5-year rule: Converted assets in a Roth IRA must wait 5 years (from the conversion year) before they can be withdrawn penalty-free, though contributions (basis) can always be withdrawn tax-free.
Converting the full Traditional IRA balance simplifies tax reporting but may trigger a large tax bill if the pre-tax balance is substantial.
Tax laws can change. The backdoor Roth IRA strategy has been proposed for elimination in some legislative proposals — always check current law.

Frequently Asked Questions

What is a backdoor Roth IRA? +

A backdoor Roth IRA is a legal strategy that allows high-income earners to contribute to a Roth IRA indirectly by making a non-deductible contribution to a Traditional IRA and then converting it to a Roth IRA. This bypasses the Roth IRA income limits that would otherwise prevent high earners from contributing directly. The strategy is perfectly legal and has been widely used since 2010 when income limits on Roth conversions were removed.

Who should use a backdoor Roth IRA? +

The backdoor Roth IRA is for individuals whose MAGI exceeds the Roth IRA direct contribution limits. In 2026, that means single filers with MAGI over $165,000 and married filing jointly with MAGI over $246,000. It's also beneficial for anyone who expects to be in a higher tax bracket in retirement, as Roth IRA withdrawals are tax-free. However, it's most impactful for those who have few or no existing pre-tax Traditional IRA balances, since the pro-rata rule can reduce the tax benefit.

What is the pro-rata rule and how does it affect me? +

The pro-rata rule requires that when you convert any amount from a Traditional IRA to a Roth IRA, the conversion is treated as a proportional mix of your pre-tax and after-tax IRA balances — you can't choose to convert only the after-tax (non-deductible) portion. For example, if you have $50,000 in pre-tax IRA money and contribute $7,000 non-deductible, your total IRA is $57,000. If you convert $7,000, the taxable portion is $7,000 × ($50,000 ÷ $57,000) = $6,140. To avoid this, you can roll pre-tax IRA balances into a 401(k) that accepts incoming rollovers, or convert your entire IRA and pay taxes on the full pre-tax amount.

How much can I contribute via the backdoor Roth IRA? +

The contribution limit is the same as the standard IRA limit: $7,000 for 2025 and 2026 (under age 50) and $8,000 for those age 50 or older (the $1,000 catch-up contribution). However, your total IRA contributions (Traditional + Roth) across all accounts cannot exceed these limits. A married couple can each do their own backdoor Roth IRA, effectively doubling the tax-advantaged space to $14,000 per year (or $16,000 if both are 50+).

Do I need to pay taxes on the backdoor Roth IRA conversion? +

You pay tax only on the pre-tax portion of the conversion. If you have zero pre-tax Traditional IRA balance, you pay no tax on the conversion — the non-deductible contribution converts tax-free. If you have pre-tax IRA money, the pro-rata rule applies and a portion of the conversion becomes taxable as ordinary income. You report this on Form 8606 with your annual tax return. The non-deductible contribution itself is not taxed (since it's made with after-tax dollars), and the Roth IRA growth is never taxed if withdrawn after age 59½ in a qualified distribution.

Is the backdoor Roth IRA at risk of being eliminated? +

There have been several legislative proposals over the years to eliminate the backdoor Roth IRA strategy (including provisions in the Build Back Better Act proposed in 2021), but none have been enacted into law as of 2026. The strategy remains legal. However, tax laws can change, and it's possible that future legislation could restrict or eliminate this strategy. Given this uncertainty, many financial advisors recommend taking advantage of the backdoor Roth IRA while it's available, but staying informed about potential changes.