Retirement

Backdoor Roth IRA Calculator

Model backdoor Roth conversions including the pro-rata rule check, conversion ladder, and mega backdoor scenarios.

Decision Summary

Roth value at retirement

$442,743.26

No traditional IRA balance means clean backdoor Roth conversion with no pro-rata tax.

Scenario Comparison

The main answer and the most important supporting outputs in one glance.

Roth value at retirement

$442,743.26

Pro-rata taxable percent

0.00%

Tax on each conversion

$0.00

Total conversions over period

$175,000.00

Key Metrics

Pro-rata taxable percent

0.00%

Tax on each conversion

$0.00

Total conversions over period

$175,000.00

Total taxable amount (pro-rata)

$0.00

How to use it

Enter your income, filing status, Traditional IRA balance, planned contribution amount, expected return, and marginal tax rate. The backdoor Roth works by contributing to a non-deductible Traditional IRA and converting to Roth, so existing Traditional IRA balances create a pro-rata tax problem.
Read the tax cost of conversion, pro-rata taxable amount, and the projected Roth value after the conversion. If you have existing pre-tax Traditional IRA money, a portion of every conversion will be taxable under the pro-rata rule.
A backdoor Roth with zero existing Traditional IRA balance is nearly free. With a large Traditional balance, the pro-rata tax can make the strategy expensive or pointless unless you roll the Traditional balance into a 401(k) first.
Roll any existing Traditional IRA into your employer 401(k) to clear the pro-rata problem, then execute the backdoor contribution and conversion in the same tax year. Use the Roth vs Traditional calculator to confirm Roth is the right destination for your bracket.
Re-run annually before contributing and whenever your Traditional IRA balance or tax bracket changes. Track conversion tax cost, cumulative Roth value, and whether the pro-rata situation is clean.

AI Integrations

Contract, discovery endpoints, and developer notes for agent use.

Always available for agents

Tool contract JSON

https://aifinhub.io/contracts/backdoor-roth-calculator.json

Stable input and output contract for this exact tool.

Human review

People can use the browser page to sense-check outputs and charts, but agents should still execute against the contract and discovery endpoints.

/agent-tools.json - machine-readable tool index.
/llms.txt - human-readable model discovery guide.
/.well-known/webmcp.json - WebMCP capabilities manifest.
/.well-known/ai-plugin.json - plugin-style discovery manifest.

{
  "tool": "backdoor_roth",
  "traditional_ira_balance": 0,
  "annual_conversion_amount": 7000,
  "tax_rate_percent": 24,
  "annual_return_percent": 7,
  "years_to_retirement": 25
}

Open tool contract JSON Open AI integrations guide

Expand developer notes

Agent playbook

Resolve Backdoor Roth IRA Calculator from /agent-tools.json and open its contract before execution.
Validate inputs against the contract schema instead of scraping labels from the page UI.
Open the browser page only when a person wants to review charts, assumptions, or related tools.

Agent FAQ

Should ChatGPT, Claude, or another agent click through the UI?

No. Start with /agent-tools.json, then follow the tool's contract URL. The page UI is for human review, not parameter discovery.

When do tools show Quick and Advanced?

Every tool opens in Quick Start first. Advanced Controls keeps the same scenario, reveals more assumptions or diagnostics, and every tool keeps AI integrations inline below the instructions.

When should an agent still open the browser page?

Open it when a human wants to sense-check the output, review the chart, or keep exploring related tools after the calculation finishes.

Questions people usually ask

What is a Backdoor Roth conversion?

It is a legal strategy where high-income earners who exceed Roth IRA income limits contribute to a traditional IRA (non-deductible) and then convert it to a Roth IRA. The result is Roth contributions that would otherwise be prohibited by income limits.

How does this calculator help?

It models the tax impact of the conversion, projects the Roth account's tax-free growth over time, and compares the outcome to leaving money in a taxable account. It also flags the pro-rata rule if you have existing pre-tax IRA balances.

What is the pro-rata rule and why does it matter?

If you have any pre-tax money in traditional IRAs, the IRS treats conversions as coming proportionally from pre-tax and after-tax balances. A $100,000 pre-tax IRA and a $7,000 non-deductible contribution means only 6.5% of your conversion is tax-free. Rolling pre-tax IRAs into a 401(k) before converting avoids this.

When should I use this vs the standard Roth calculator?

Use this if your income exceeds Roth IRA contribution limits ($161,000 single / $240,000 married in 2025) and you want to model the backdoor strategy. The standard Roth calculator assumes you are eligible for direct contributions.

Is my data stored?

No. All calculations happen in your browser. Nothing is stored or transmitted.