Taxpayers timely filed their 2014 tax return. In August, 2016 the IRS sent them a CP2000 notice for additional income and tax due. Taxpayers paid the tax on May 24, 2017. The change was related to a stock sale with no basis reported so the IRS did not give them a deduction for the basis. From reviewing the instructions it looks like an amended return would have been required to be filed by May 24, 2019, two years after payment. Of course these folks prepared their return and just walked in my door yesterday.
Am I understanding this right? If anyone has any other suggestions, it would be appreciated.
Thanks!