I recently successfully appealed a penalty for late filing [self assessment] from last tax year [y/e 2020], as I don't actually have to do one - I don't earn enough. I called them as they then told me I had £52 o/s from 2017 and I was happy to pay that.
I have just had an email from them [legit - I checked] stating that there was a message for me. I logged on to my tax account and they have clobbered me for 3p from y/e 2018 - penalty of £300. Why did they not mention this when I called them to pay for 2017?!
WTAF?