DON’T! - These letters are important, that’s why you always feel nervous opening them probably, if you have any doubts, send them to your accountant to action on your behalf. If the communications mention anything about payments / penalties / overdue amounts, then make sure you DO NOT IGNORE them. It could be the difference between sorting things out in a timely manner and having to pay up to £1600 penalties. Yes, I sadly have a client who ignored all of those green letters and has ended up with all sorts of late payment penalties, this is so unnecessary and could have meant a nice family holiday for her and her family this year instead of a cheque being sent to HMRC.