Summary

Thurgood Marshall United Ates v. Skelly Oil Company…

Therefore, if a deduction for 100% of the repayments were allowed, every time money is received and later repaid the taxpayer would make a profit equivalent to the taxes on 27 1/2% of the amount refunded. In other situations when the taxes on a receipt do not equal the tax benefits of a repayment, either the taxpayer or the Government may, depending on circumstances, be the beneficiary. Here, the taxpayer always wins and the Government always loses. We cannot believe that Congress would have intended such an inequitable result.
Source: Wikisource

Thurgood Marshall United Ates v. Skelly Oil Company…

Where the 25% alternative tax is not used, individual taxpayers are taxed at ordinary rates on 50% of their capital gains. See § 1202. In such a situation, the rule of the Arrowsmith case prevents taxpayers from deducting 100% of an item refunded when they were taxed on only 50% of it when it was received. Although Arrowsmith prevents this inequitable result by treating the repayment as a capital loss, rather than by disallowing 50% of the deduction, the policy behind the decision is applicable in this case.
Source: Wikisource

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