Everyone earning over £20,000 a year faces a tax rise from 2011.
Today's Pre-Budget Report revealed National Insurance will rise by 0.5% from 2011, meaning middle and high earners face tax rises.
In April's Budget statement, the Chancellor unveiled an increase of 0.5% in National Insurance, and today's increase will come ontop of the existing levy.
However, the minimum earnings limit for paying National Insurance has been increased, meaning no one earning less than £20,000 will see an increase in their contributions.
The move is expected to raise around £3bn for the Treasury.
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