It depends on your circumstances whether the taxable amount could have been reduced each year and whether Tax Years 2018 and 2019 should be amended.
It is possible that some portion of the IRA contributions would reduce the taxable amount of each year's RMD. Some IRA's are not deductible but still taxable depending on whether the investment was a traditional IRA or a Roth IRA.
Use your last filed Form 8606 to determine this calculation. Click the article Where do I find Form 8606? for TurboTax instructions to capture these details.
IRS Publication 590-B Distributions for Individual Retirement Arrangements (IRAs) under the heading Distributions Fully or Partly Taxable has more details and worksheets if you wish to calculate the nondeductible portion yourself.
