If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
HMRC is sending more than a million letters between the end of October and December to taxpayers who did not pay enough tax under PAYE in 2010 to 2011.