1 EXHIBIT 12.1 COSTILLA ENERGY, INC. ADJUSTED EBITDA/INTEREST EXPENSE (IN THOUSANDS) YEARS ENDED DECEMBER 31, --------------------------------------------------------------- 1997 1996 1995 1994 1993 -------- -------- -------- -------- -------- Net income (loss) $(36,471) $ (4,440) $ (4,970) $ 163 $ 73 Interest expense 12,979 11,281 4,591 1,458 605 Income taxes 152 1,218 3 40 (23) Exploration and abandonment 6,588 2,550 1,652 793 218 Depreciation, depletion and amortization 26,409 12,430 5,958 1,847 884 Impairment of oil and gas properties 28,189 -- -- -- -- Gain from sale of substantially all the assets of wholly-owned subsidiary -- (906) -- -- -- Extraordinary loss resulting from early extinguishment of debt, net of the related deferred tax benefit of $129 and $1,042 219 4,975 -- -- -- -------- -------- -------- -------- -------- ADJUSTED EBITDA $ 38,065 $ 27,108 $ 7,234 $ 4,301 $ 1,757 ======== ======== ======== ======== ======== Interest expense per consolidated financial statements $ 12,979 $ 11,281 $ 4,591 $ 1,458 $ 605 Less: amortization deferred charges (518) (1,028) -- -- -- -------- -------- -------- -------- -------- Interest expense - net of deferred charges amortization $ 12,461 $ 10,253 $ 4,591 $ 1,458 $ 605 ======== ======== ======== ======== ======== ADJUSTED EBITDA/Interest expense - net of deferred charges amortization 3.1x 2.6x 1.6x 2.9x 2.9x ======== ======== ======== ======== ========