The sale of the A Corporation stock and the subsequent purchase of the C Corporation stock on Harlon's pretax earnings results in an unrealized holding gain.
The unrealized holding gain occurs because the Harlon Corporation reinvested the sale proceeds with the purchase of C Corporation stock. While the pretax earnings will increase by the gain (difference between the sale proceeds and the investment's book value), the unrealized holding gain is not taxable.
Thus, the effect of the sale increases the pretax earnings in the financial statements but the purchase of another investment cancels its taxation effect for the current moment.
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