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%.
More top news
Charities warn that sitting down too long can lead to health risks such as type 2 diabetes and cardiovascular disease.
The Labour leader will use a speech to set out the differences between his party and the Conservatives with particular emphasis on the NHS.
Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.