HMRC has recently announced that approximately 6 million taxpayers are due tax refunds averaging £400 each, while another million will face tax underpayment notices of approximately £600 each. This relates to the tax year 2007-08 and earlier.
If you receive an underpayment notice firstly check that the facts are correct such as sources of income for that tax year. Then look at the information that HMRC would have had at the time to determine your PAYE code for that tax year. It may be that in very specific circumstances an appeal under Extra Statutory Concession A19 may be appropriate.
If you receive an underpayment notice and wish to discuss the situation further then please let us know.