Visitors from India and other 'high risk' countries in Asia and Africa will be forced to pay £3,000 cash bond before they enter UK.
The money will be kept by the Government if visitors do not return home by the time their visas expire.
A pilot scheme, introduced by Home Secretary Theresa May, will target hundreds of people coming to Britain on six-month visit visas from India, Pakistan, Nigeria, Ghana, Sri Lanka and Bangladesh.