Wikipedia sums it up quite well:
Everton F.C. is a limited company with the board of directors holding a majority the shares.[55] The club owes £44.8 million to banks, excluding loan interest and early repayment penalties, with total liabilities of £95 million. Their most recent turnover was £79 million;[56] the second highest in the club's history.[57] The club's overdraft with Barclays Bank is secured against the Premier League's "Basic Award Fund",[58] a guaranteed sum given to clubs for competing in the Premier League.[59] Everton agreed a long-term loan of £30 million with Bear Stearns and Prudential plc in 2002 over the duration of 25 years; a consolidation of debts at the time as well as a source of capital for new player acquisitions.[60] Goodison Park is secured as collateral.