The Prime Minister has insisted there are "positive signs" that take-home pay is rising.
An analysis of take home pay figures circulated by the Treasury has suggested all but the top 10% of earners saw a rise last year.
Overall people saw their take home pay rise by a third more than the rate of CPI inflation, currently 2%.
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Theresa May has launched her bid to become the next leader of the Conservative Party.
The government is set to announce that David Cameron's successor will make the decision on whether to expand Heathrow or Gatwick.