I have a client that received a CP2000 for some stock sales that were not reported on their 2022 tax return.  When reviewed the IRS was correct they were not reported but naturally they did not have the cost basis, so we filed an amended return citing the CP2000.  When I check the status with "Where's my amended return", I get "We cannot provide any information on your amended return".  This amendment was mailed in December in 2024, as it could not be electronically filed as they were transitioning for the new tax year.

My question is, should I refile the amendment as it has been 6 months with no status change.  I am wondering if they did not receive it and the client is getting updated notices.