Detailed record-keeping is not required when you withdraw from a Roth IRA after age 59-1/2. See a walkthrough in TurboTax and H&R Block tax software.
Tax Planning with TurboTax What-If Worksheet: Roth Conversion
After you file your taxes with TurboTax, use the hidden What-If Worksheet to plan for the current year. See how to use it to plan for a Roth conversion.
Roth Conversion with Social Security and Medicare IRMAA
A step-by-step walkthrough of how to use the Case Study Spreadsheet to estimate tax rates on Roth conversion with Social Security and Medicare IRMAA.