So it was in that previous year that the sales were overstated and the corporation tax was too much
Is the correct thing to do to resubmit amended accounts for that year? Or is it OK just to put the true figures (under 31/12/2010) for the 31/12/2011 year-end?
Have you collated together the evidence of prior year error? If it relates to year ending 31st Dec 2010, you can submit an amended corp tax return to HMRC. As far as I am aware, you have 12 months from filing date to submit amended return, so can still submit amended return for year ended 31st Dec 2010 by end of December 2012.
Regarding statutory accounts; If £5k is not material: Book a prior year adjustment, reducing retained earnings bfwd by £5,000 and restate the balance sheet as at 31st Jan 2010 (presuming yearend is 31st Dec 2011). Disclose impact of adjustment in notes.
If it is material or you are not sure if material, give Companies House a buzz; they may ask you to resubmit Amending accounts for year ending 31st Dec 2010.
Dalbir
ps: legal stuff; this is a forum for discussion and opinions, so no liability on me and my related parties for my posting.