Many consider converting a tax-deferred account, such as a Rollover IRA or 401(k), to a tax-free Roth but want to know the tax impact first. This calculator will show the federal and state tax impact of any Roth conversion by adding the conversion amount to your estimated tax return both with and without the conversion. You’ll get a detailed estimate of the cost of any conversion amount. Plus, you’ll see whether your income with the conversion might trigger a Medicare IRMAA surcharge in 2 years. Roth conversions are covered in “What Would Dad Do? Volume 3 - The Later Years” and in several of Mr. Tom’s blog posts.

Requires the Excel, LibreOffice, or OpenOffice application. The spreadsheet-formatted files are provided at the download link emailed after checkout.