Roth IRA Conversion Calculator

Use this calculator to estimate the tax cost and future value impact of a Roth IRA conversion.

What this calculator does

The Roth IRA conversion calculator compares converting Traditional IRA assets to Roth against leaving them tax-deferred. It estimates conversion tax and future value difference.

It uses:

• conversion amount
• current marginal tax rate
• years until retirement
• expected retirement tax rate

Roth IRA Conversion Formula

Conversion Tax = Conversion Amount × Current Tax Rate

Where:

• Conversion Amount = amount moved to Roth
• Current Tax Rate = tax rate paid on conversion
• Future Roth Value = converted amount grown tax-free
• No-Convert Value = future value after retirement tax

Example calculation

If:

• Conversion amount = 50,000
• Current tax rate = 24%
• Conversion tax = 12,000
• Years to retirement = 20

Then:

• Converted assets grow in Roth
• Non-converted assets remain taxable later
• The comparison depends on future tax rate
• The net advantage can be positive or negative

The upfront conversion tax is 12,000.

What is a Roth IRA conversion?

A Roth IRA conversion moves money from a pre-tax retirement account into a Roth account. The converted amount is generally taxable in the year of conversion.

Why Roth conversion matters

• can reduce future taxable withdrawals
• may help manage RMD exposure
• creates tax-free Roth assets
• depends heavily on tax-rate timing

When to use this calculator

• evaluating a conversion year
• comparing current and future tax rates
• planning before RMD age
• estimating tax cash needed

Common mistakes

• forgetting the conversion tax bill
• converting too much in one year
• ignoring Medicare or tax bracket effects
• assuming conversion always helps

Roth conversion vs backdoor Roth

A Roth conversion moves existing pre-tax assets to Roth. A backdoor Roth is usually a nondeductible IRA contribution followed by conversion.

Both involve Roth treatment but solve different planning problems.

FAQs

What is a Roth IRA conversion?

It is moving pre-tax retirement assets into a Roth IRA and paying tax on the converted amount.

How do you calculate Roth IRA conversion tax?

Multiply the conversion amount by your current marginal tax rate.

What is a good Roth conversion amount?

A good amount fits your current tax bracket and long-term retirement tax plan.

What is the difference between Roth conversion and backdoor Roth?

Conversion moves existing assets. Backdoor Roth creates a new Roth contribution path.