Thanks for your question
Assuming you have declared bankruptcy after 06/04/2013
Yes the 2012/2013 return still needs to be filed but ideally this should have already been done so that any tax owed was included in the bankruptcy. Is there a reason you have delayed in doing this prior to filing for bankruptcy?
Then for 2013/2014 (so after 05/004/2014) you will have two tax returns
1) From 06/04/2013 to the date of bankruptcy and
2) With a new Unique taxpayer reference from the date of bankruptcy to 05/04/2014
Then you will fill in tax returns each year after - if your income requires it - such as self employment
If, however you made bankrupt in 2012/2013 then two returns for 2012/2013 instead again
1) from 05/04/2012 to date of bankruptcy and
2) from date of bankruptcy to 05/04/2013
And then self assessment tax return as normal thereafter if you remain still in receipt of the same income (such as self employment)
HMRC then do NOT pursue you for any of the tax that might have been due during the whole tax year in which bankruptcy arose, but the position regarding 2012/2013 creates a problem as this clearly would not have been included in the bankruptcy order as the figures for that complete year would not have been known and should have been identified, so you may need to contact the organisation that dealt with your bankruptcy to establish the position with them for 2012/2013.