Income tax rules also made borrowing against a home's equity attractive. Because mortgage interest payments can be deducted for income tax purposes, the interest paid on home equity loans could also be deducted, although interest on credit card debt or other debt was not deductible. Therefore it often paid anyone with any other kind of debt to pay off that debt with a home equity loan, whose interest would be deductible for income tax purposes. More and more people began to do this during the housing boom. In 2003, home equity loans totaled $593 billion. Such loans soared during the housing boom, nearly doubling to $1.13 trillion in 2007.