There are three things that you can count on that HMRC will do:   Calculate the amount of tax you owe based on the information they have gathered. Chase you for payment of this tax if not recovered by PAYE. Pursue you if they believe you have under-declared your taxable income or made excessive claims to reduce your tax.   What they will not do is advise you to maximise the benefit of reliefs and allowances to which you are entitled to claim.   HMRC rely to some extent on the age-old principal that ignorance of the law is not, [...]