David Cameron is ready to publish details of his tax returns amid controversy over whether senior politicians are paying their fair share.
The Prime Minister is understood to be "very happy" for the information to be released.
Chancellor George Osborne indicated last week that the Government was considering whether ministers should be more transparent about personal tax.
He and other wealthy members of the coalition have faced intense pressure to say whether they benefited from the decision in the Budget to r educe the top rate from 50p to 45p .
The issue is also playing strongly in the London Mayoral race, where Labour candidate Ken Livingstone has been accused of channelling earnings through a corporation to minimise his tax bill.
He insists there was nothing wrong with the arrangement .
Downing Street sources have said Mr Osborne and Mr Cameron discussed disclosing tax records before the Chancellor floated the idea in an interview last week.
The move would be unprecedented for a sitting Prime Minister.
But Mr Cameron believes that people seeking the "highest office" should expect such scrutiny.
Mr Cameron earns £142,500 a year as Prime Minister.
However, it is thought that income from renting out his London property could push him above the £150,000 top tax threshold.
Mr Osborne has said his earnings did not put him in the highest bracket in 2010-11.
The TaxPayers' Alliance research director John O'Connell said: "It's inevitable that we've seen calls for politicians to disclose their tax affairs but it's a huge invasion of privacy.
"Ideally, the tax system would be so simple that everyone was clear on what they owed."