Chancellor George Osborne has announced a new clampdown on tax evasion targeting offshore account holders.
He warned that anyone who fails to declare all of their income will have to pay the tax itself as well as penalties of up to twice that sum, and they could even face imprisonment.
Mr Osborne said: "We're throwing all the resources of the HMRC, our tax collectors, behind this. We'll be running adverts to give people fair warning that if they're hiding money offshore overseas that's not acceptable.
"We will find people - they have to pay their taxes and ultimately this is about fairness".
The new campaign will run in national newspapers and weekly magazines from tomorrow.
More top news
At least 10 Olympic medallists are reportedly among the Russian athletes who have tested positive for doping at the 2008 Beijing Games.
The actress and director tells ITV News cable TV is a better place than mainstream Hollywood for female filmmakers to get opportunities.
Professor Alexander Haddow's papers on Zika virus have been rediscovered in the University of Glasgow's archive, after nearly 40 years.