Hello I have a question. I have a client that last year i got her caught up on taxes and filed about 3 years worth and along with that was 2020 taxes. Since during the Pandemic it was all done remotely collecting documents and information answered through messenger. This client contacted me to start working on this years taxes and proceeded to tell me it would be just her because her husband passed away. As i got started i asked for her husbands date of death for form 1040 she told me it was in feb of 2020. so she had me file her taxes last year not stating her husband had died. My question is how should i handle this? Should i amend last year return or should i just file this year as single and go on? I have never came across this issue. Thanks