I haven’t even submitted my 2010/11 tax return yet.

You are right to be worried about the tax refund, as the Taxman’s computer has issued some incorrect refunds recently. If you normally complete a self-assessment tax return but also have some income taxed under PAYE, the computer should wait until your tax return has been submitted before calculating the tax to be refunded. In a few cases this has not happened, and the tax refund has been based only on the taxpayer’s PAYE income. Please ask us to check the tax calculation that should have arrived with your refund cheque.