EXHIBIT 12 TERRA INDUSTRIES INC. COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (AMOUNTS IN THOUSANDS OF DOLLARS) YEAR ENDED DECEMBER 31, THREE MONTHS ENDED MARCH 31, -------------------------------------------------------- --------------------------------- PRO FORMA PRO FORMA FOR AMCI FOR AMCI ACQUISITION ACQUISITION 1990 1991 1992 1993 1994 1994 1994 1994 1995 -------- ------- ------- ------- -------- ----------- --------- ---------------------- (A) Earnings: Income from continuing operations before income taxes, extraordinary items and cumulative effect of accounting changes. $(14,938) $13,106 $18,186 $32,145 $ 89,945 $181,884 $ (9,865) $ (3,879) $ 53,883 Add: (a) Fixed charges per Item (B) below........ 24,297 20,701 17,237 22,483 36,562 73,461 5,866 17,469 18,082 (b) Dividends of unconsolidated affiliates............ -- -- -- 537 190 190 73 73 246 Deduct: (a) Undistributed income from unconsolidated affiliates............ -- -- -- (2,275) (743) (743) 554 554 1,197 -------- ------- ------- ------- -------- -------- --------- --------- --------- $ 9,359 $33,807 $35,423 $52,890 $125,954 $254,792 $ (3,372) $ 14,217 $ 73,408 ======== ======= ======= ======= ======== ======== ========= ========= ========= (B) Fixed charges: Interest on indebtedness, expensed or capitalized........ $ 17,629 $14,352 $10,617 $12,944 $ 22,082 $ 57,922 $ 2,935 $ 14,102 $ 14,007 Amortization of debt discount and expense and premium on indebtedness, expense or capitalized........ 40 40 47 250 316 316 79 79 79 Portion or rents representative of the interest factor....... 6,628 6,309 6,573 9,289 14,164 15,223 2,852 3,288 3,996 -------- ------- ------- ------- -------- -------- --------- --------- --------- Fixed charges, for computation purposes.. $ 24,297 $20,701 $17,237 $22,483 $ 36,562 $ 73,461 $ 5,866 $ 17,469 $ 18,082 ======== ======= ======= ======= ======== ======== ========= ========= ========= Ratios of earnings to fixed charges(1)(2).... -- 1.63 2.06 2.35 3.45 3.47 -- -- 4.06 ======== ======= ======= ======= ======== ======== ========= ========= ========= - -------- (1) Earnings available for fixed charges were insufficient to cover fixed charges by $14.9 million for the year ended December 31, 1990, and $9.2 million and $3.3 million for the historical and pro forma three-month periods ended March 31, 1994, respectively. As a result, the financial ratios for such periods are not meaningful and, therefore, not included. (2) Assuming the 10 1/2% Senior Notes due 2005 were issued at the beginning of 1994, fixed charges would have been increased to $79,847 for pro forma 1994, and $19,065 and $19,228 for the pro forma three-month periods ended March 31, 1994 and 1995, respectively. As a result, the ratio of pro forma earnings to pro forma fixed charges would be 3.19 for 1994 and 3.82 for the three-month period ended March 31, 1995. Pro forma earnings available for fixed charges would have been insufficient to cover pro forma fixed charges by $4.8 million for the three-month period ended March 31, 1994.