What is the Backdoor Roth IRA?

The Backdoor Roth is an IRS-compliant strategy allowing high-income earners whose income exceeds the statutory limits ($161k single / $240k married) to fund a Roth IRA by contributing after-tax non-deductible money to a Traditional IRA and subsequently converting it to a Roth IRA.

What is the IRS Pro-Rata Rule for Backdoor Roth IRAs?

Under IRC § 408(d)(2), the IRS treats all of your Traditional, Rollover, SEP, and SIMPLE IRAs as a single pool. If you have pre-tax money in any of these accounts on December 31, your conversion will be taxed proportionally, preventing you from converting only after-tax dollars.

How can I avoid the Pro-Rata rule on a Backdoor Roth?

The most effective method is a 'Reverse Rollover'—rolling pre-tax Traditional, Rollover, or SEP IRA funds into an active employer 401(k), 403(b), or Solo 401(k) before December 31. Employer plans are exempt from the IRA aggregation rule, reducing your IRA pre-tax balance to zero.

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Backdoor Roth & Pro-Rata Tax Calculator

High earners ($161,000+ single / $240,000+ married) are phased out from contributing directly to a Roth IRA. Calculate your exact tax liability under the IRS Pro-Rata Rule, preview IRS Form 8606, and verify your zero-tax execution plan.

ESTIMATED TAX ON CONVERSION

Federal & State tax due on conversion

TAX-FREE CONVERSION BASIS

$7,000

Enters your Roth IRA completely tax-free

TAX-FREE RATIO

100.0%

Pro-rata nontaxable conversion ratio

TAXABLE PRE-TAX SPILLOVER

$0 (0.0%)

Pre-tax dollars pulled into conversion

Conversion Assumptions

Nondeductible Traditional IRA Contribution ($) Statutory IRS limit for 2026: $7,000 ($8,000 if age 50+).

Total Pre-Tax Balance in ALL Traditional IRAs ($) Includes pre-tax Traditional, Rollover, SEP, and SIMPLE IRAs across all brokerages as of Dec 31.

Federal Marginal Tax Bracket

State Marginal Income Tax Rate

💡 Pro-Rata Ratio Meter:

🟩 Tax-Free Basis 🟥 Taxable Spillover

IRS Pro-Rata Analysis & Strategic Roadmap

IRS Form 8606 Line-by-Line Preview

Tax Return Audit Trail

Line 1: Nondeductible contribution made for 2026 $7,000

Line 3: Total basis in Traditional IRAs $7,000

Line 6: Total pre-tax Traditional IRAs as of Dec 31 $0

Line 8: Net amount converted to Roth IRA $7,000

Line 9: Total IRA aggregation pool (Lines 6 + 7 + 8) $7,000

Line 10: Nontaxable ratio (Line 5 ÷ Line 9) 1.0000

Line 11: Nontaxable portion of conversion (Line 8 × Line 10) $7,000

Line 15: Taxable amount of conversion (Line 8 − Line 11) $0

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Execution Protocol

The 3 Golden Rules of a Flawless Backdoor Roth IRA

How high earners legally avoid IRS audits and penalties.

RULE 01

Contribute After-Tax First

Make a nondeductible contribution to your Traditional IRA. Never claim a tax deduction for this contribution on your Form 1040, creating your after-tax cost basis.

RULE 02

Convert to Roth Immediately

Do not let the money sit in a money market fund generating taxable interest. Convert the funds to your Roth IRA within 1–2 business days so interest accrual is negligible ($0–$2).

RULE 03

Zero Out Pre-Tax IRAs by Dec 31

The IRS measures your pro-rata pre-tax balance on December 31 of the conversion year—not the day of the conversion! Roll any Traditional, SEP, or SIMPLE IRAs into an active 401(k) before year-end.