Update After enduring the stress for almost a year of getting letters from IRS saying we are working on your case but in the meantime pay us 150k for each year from 2013-2015 plus thousands more in additional interest each month i received a 3064c letter saying no further action is to be taken for tax years 2013-2018.The problem is my penalty relief request was for 2013-2020.I have not received any previous CP notices about 2019-2020- only 2013-2015 were an issue. Should i be concerned about this? Years 2013,2014,2015,2016,2017,2018,2019,2020 were noted separately on penalty relief transmittal however on the 1500.00 check i put check was for penalty tax relief year 2013-2020.Not sure if not listing each year separately on check would cause an issue.