Rich individuals and their families have as much as $32 trillion of hidden financial assets in offshore tax havens, representing up to $280 billion in lost income tax revenues, according to research published on Sunday.

The study estimating the extent of global private financial wealth held in offshore accounts - excluding non-financial assets such as real estate, gold, yachts and racehorses - puts the sum at between $21 and $32 trillion.

Read More: Yahoo Finance News