Example. Taxpayer A incurs a net operating loss for taxable year 1980 of $80,000, of which $60,000 is a product liability loss. A's taxable income for each of the 10 years immediately preceding taxable year 1980 was $5,000. The product liability loss of $60,000 is first carried back to the 10th through the 4th preceding taxable years ($5,000 per year), thus offsetting $35,000 of the loss. The remaining $25,000 of product liability loss is added to the remaining portion of the total net operating loss for taxable year 1980 which was not a product liability loss ($20,000), and the total is then carried back to the 3rd through 1st years preceding taxable year 1980, which offsets $15,000 of this loss. The remaining loss ($30,000) is carried forward pursuant to section 172(b)(1) and the regulations thereunder without regard to whether all or any portion thereof originated as a product liability loss.
Indirect corporate expense, or overhead, is not to be allocated to product liability claims so as to become a product liability loss.
26 C.F.R. §1.172-13