(ABC News) The release of a massive leak of tax and financial records known as the Panama Papers has shone the spotlight on how the wealthy global elite evade taxes and launder money.
One of the most important tools is a "shell company" - this is a company that exists only on paper and has no office and no employees. It's usually registered to the address of a company that provides a service setting up shell companies in a tax haven.
For example, that's why this five-storey building in the Cayman Islands supposedly houses more than 12,000 corporations.
Advertisement - story continues below