IRS Changed 2018 tax return

[SueBustamante]

The IRS changed my 2018 tax return due to deceased spouses' trustee filing a different tax return as married, filing separately a month after I filed as married, filing jointly.   IRS then redid the taxes without including allowable tax deductions and ended up saying I owed them thousands of dollars, plus interest.  Can I still send an amended tax return that proves they need to repay the money they said I had to pay and the 2021 return $$ they confiscated?  Any suggestions or advice would be appreciated.  

[rjs]

An amended return is probably not appropriate. You need to go to a tax professional or tax lawyer who has experience handling IRS disputes. I suggest that you go right away, even though tax people are very busy right now, because the statute of limitations for 2018 ends in less than two weeks.

[SueBustamante]

Thank you very much.  I think we are SOL on this, since the deadline is so close and tax professionals are at their busiest.   We did file a protest contesting their findings several weeks ago, by registered mail and fax.