Final answer:
To record the purchase of the patent, debit Intangible Assets - Patent and credit Cash or Accounts Payable for $600,000. In year 1, debit Amortization Expense and credit Accumulated Amortization - Patent for $40,000. If the patent is impaired, debit Impairment Loss for $480,000 and credit Intangible Assets - Patent for the same amount.
Step-by-step explanation:
When recording the purchase of the patent, the journal entry would be a debit to the Intangible Assets - Patent account for $600,000 and a credit to Cash or Accounts Payable for $600,000. For the amortization in year 1, you would debit the Amortization Expense account and credit the Accumulated Amortization - Patent account for $40,000, which is the result of the $600,000 cost divided by the 15-year useful life.
If the patent is impaired, an adjusting entry is needed to write down its carrying amount to the recoverable amount, which is the higher of future cash flows and fair value. Because the future cash flows expected are now $120,000 and the fair value is zero, the asset is impaired. The adjusting entry would involve a debit to an Impairment Loss account for $480,000 (the carrying amount of $600,000 less expected future cash flows of $120,000) and a credit to the Intangible Assets - Patent account for $480,000.