Nicola Sturgeon, Kezia Dugdale, Ruth Davidson and Willie Rennie announce financial details.
The move comes after a row over the PM's involvement in the 'Panama Papers' scandal.
Comment: Mary McCool on the dark underbelly of the cosy bingo hall.
Kezia Dugdale called for other party leaders to reveal details of their tax returns.
The May 5 Holyrood election will be the first in which 16 and 17-year-olds can vote.
The UK Labour leader told Scots they can 'break from austerity' with new tax powers.
Thousands attended a Downing Street rally calling for David Cameron to resign.
Analysis: Carole Erskine gives you the inside track on the race to form Scotland's next government.
Analysis: Alison McCallum stands up for racing cars and zip slides on the Holyrood campaign trail.
The First Minister previously said there was 'no agreement' on investment projects.
Sport, engineering and vocational qualifications are all issues which will be raised.
The poll also shows that most people would be willing or may be willing to pay 1p extra in tax.
The justice secretary Michael Gove called the leaflet 'one-sided propaganda'.
The party's manifesto also promises a repeal of air gun legislation.
Cartoon: STV's award-winning artist on the Panama Papers and the Cameron family.
Robert Peston writes the Camerons could not have avoided income tax through Blairmore Holdings.
Latest figures show 0.2% growth in the final three months of 2015.
Liberal Democrat leader has written a letter to the Information Commisoner to investigate.
STV News asked three charities what policies they'd like to see in the next Scottish Parliament.
The poll indicates Labour will finish second while the Greens could have their best ever result.