Tunneling, or tunnelling (see spelling differences), is a colloquial term for a specific kind of financial fraud. It is defined as "the transfer of assets and profits out of firms for the benefit of those who control them". For example, a group of major shareholders or the management of a publicly traded company orders that company to sell off its assets to a second company at unreasonably low prices. The shareholders or management typically own the second company outright, and thus profit from the otherwise disastrous sale. Tunneling differs from outright theft because people who engage in tunneling generally comply with all of the relevant legal procedures; it is thus a subtler scheme than simply writing checks from a company to a private bank account. While people widely agree that tunneling is unethical, penalties for it vary widely; some states impose criminal sanctions, whereas other states provide either for civil suits only, or for no sanctions at all.
The word 'tunneling' was probably first used in this way in the Czech Republic (tunelování in Czech, tunelář for the person committing fraud) during the first half of the 1990s, when several large, previously privatised banks and factories unexpectedly went bankrupt. It was discovered later that the managements of these companies were deliberately transferring company property and real estate into their own private businesses, sometimes in offshore locations.
The term became a common label for this kind of criminal activity among Czechs and Slovaks. The term subsequently appeared in specialized literature in English, and then in a broader literature during the Asian financial crisis in the late 1990s.
The most common scheme in Central Europe in the post-privatization era was transferring funds and property from high cash flow corporations to companies privately owned by the very same management. Transfers were accomplished via huge loans that were issued without any expectation of repayment, via massive overpayment for outsourced services, or simply by selling a corporation's real estate for a fraction of its market price. The main conditions enabling such a fraud is weak law against conflict of interests, non-existent legal liability of managers for leading their employer towards bankruptcy, and incompetence of financial authorities.