Mayor of London Boris Johnson was born in New York and holds dual citizenship.
Spokesman for former prime minister disputes £57m figure.
The Shadow Chancellor says he would like to see the revenue going to the NHS as soon as possible.
In October, the EU declared that the UK would have to pay £1.7bn in extra tax.
One in three calls cut off on public helpline.
High-street shops, pubs and cafes to benefit as government announces review into the tax.
Bitcoin price drops sharply, as MasterCard complains of digital currency's anonymity.
The amount of tax paid by the financial sector is going up.
US citizens and dual citizenship holders are obliged to file a tax return regardless of domicile.
Hungary levies 'chips tax' on unhealthy food items and environmental fee for shampoos and soaps.
The amount recovered is up by a quarter on the 2012/13 fiscal year.
Britain's new European commissioner Jonathan Hill warns of the situation getting out of hand
Prime Minister David Cameron pledged to forgo paying £1.7bn in extra tax.
Whitehall is calling it a 'revolution in tax transparency' while TUC is unsure of the motives.
Freedom of Information request reveals how HMRC uses taxpayers' money for tax avoidance snitches.
The tax gap was up 6.8% in the year to April 2013.
David Cameron made comments about the 'mega rich' at charity event.
As Palo Alto start-up billionaire Marc Andreseen famously said - software is eating the world.
Amazon claims it has received no special treatment as EU opens probe into tax dealings in Luxembourg.
It believes that some people will get taxed twice.
Tax expert Lee Sheppard invokes state aid case involving Gibraltar and the European Court of Justice.
Holiday tax has risen by almost £400m since 2008.