In February 2010, HMRC encountered problems following the implementation of their taxes modernisation program called Modernising Pay-as-you-Earn Processes for Customers (MPPC). The IT system was launched in June 2009 and its first real test came in a period known as annual coding. Annual coding issues certain codes to tax payers on a yearly basis. The annual coding process sent out incorrect tax coding notices to some taxpayers and their employers meaning that they would pay too much tax the following year.