I received a letter recently saying that l had underpaid tax for the last few years. So I’ve been wanting to review my P60’s to check this. I have been chasing my previous employer for my P60 for April 2019 to March 2020. I left the role in December 2019 and because of this they are saying l didn’t get a P60. Just a P45 but obviously these are different documents?! Should l be able to get a P60 from them?