#3313 · Finance Tool

Roth Conversion Tax Impact Calculator

Roth Conversion Tax Impact Calculator turns your planning assumptions into an actionable estimate of estimated current tax. Adjust the values to compare scenarios, then use the supporting figures to see what drives the result. The calculation is a planning aid, not a prediction, and it leaves rates and tax assumptions under your control.

Calculator

Enter your assumptions
$
%
For after-tax contributions, only associated pretax earnings may be taxable.
%
%
$

How to use this calculator

  1. Enter the assumptions that describe your Roth conversion plan.
  2. Use marginal tax rates rather than average tax rates where the field calls for them.
  3. Select Calculate to update the estimate.
  4. Review the main result together with the secondary figures and assumptions.

Formula

Taxable amount = processed amount × taxable share. Estimated tax = taxable amount × (federal rate + state rate).

What the result means

The result estimates incremental current tax using user-entered marginal rates, without modeling tax brackets or deductions.

Tax rules and plan accounting are fact-specific. This estimate is not tax advice and does not calculate penalties, credits, or the pro-rata rule.

Example calculation

For an $80,000 amount that is 100% taxable, a 24% federal rate and 5% state rate produce an estimated $23,200 current tax.

Tips for better results

  • Model conversions year by year when tax brackets change.
  • Keep money for conversion tax outside the IRA when practical.
  • Check the five-year rules before planning early access.
  • Include state tax if it applies to the conversion.
  • Compare several future tax-rate assumptions.

Frequently asked questions

Why does the Roth conversion calculator ask for a taxable share?

Because some transactions may contain both after-tax basis and taxable pretax amounts or earnings.

Does this estimate account for progressive federal tax brackets?

No. It applies your entered marginal rate to the taxable amount.

Is state income tax always due?

No. State treatment varies, so enter zero when state income tax does not apply to your situation.

Does the result include the early-distribution penalty?

No. The calculation estimates income tax only and does not determine whether a penalty applies.

Why compare the tax with outside cash?

Paying tax from outside funds can help keep more money in the retirement account, but suitability depends on your situation.

Tax-impact variables

VariableIncluded
Taxable sharePortion treated as current taxable income
Marginal ratesUser-entered federal and state rates

Browse calculator categories

22 category hubs