You will not be liable for any tax owing up to and including the date of the bankruptcy. By doing the returns you will at least be able to define exactly how much is owing, but this will be established in due course anyway as the Insolvency Service will write to HMRC for these figures.
Bankruptcy UK specialises in guiding people through the bankruptcy process in a no-nonsense, straightforward manner. We will assess your circumstances then submit the bankruptcy application online. call us for an informal chat about your circumstances on 01425 600129.