Louis Brandeis, Lucas v. American Code Company…
“ It may be assumed that, since the company kept its books on the accrual basis, the mere fact that the exact amount of the liability had not been definitely fixed in 1919 would not prevent the deduction, as a loss of that year, of the amount later paid. But here there are other obstacles. Obviously, the mere refusal to perform a contract does not justify the deduction, as a loss, of the anticipated damages. For, even an unquestionable breach does not result in loss, if the injured party forgives or refrains from prosecuting his claim. ”
