If you estimated your income for the tax year 2010/2011 when you renewed your tax credits in 2011, for example, because you were self-employed, you need to give your actual income figure for that tax year to HMRC as soon as possible.
The deadline for providing this information to the Tax Credit Office is 31 January 2012.
You can tell the Tax Credit Office your actual income figure by calling the Tax Credit Helpline. The contact details are:
HM Revenue and Customs Tax Credit Office
Preston
PR1 4AT
Helpline: 0345 300 3900 (Monday to Friday from 8.00am to 8.00pm; Saturday from 8.00am to 4.00pm)
Welsh language tel: 0845 302 1489 (Monday to Friday from 8.30am to 5.00pm)
Textphone: 0345 300 3909
Website: www.hmrc.gov.uk
For more information about tax credits, see Benefits and tax credits for people in work and Benefits for families and children.