Final answer:
The December adjusting entry should be recorded on December 31 to reflect the interest expense accrued during the month of December.
Step-by-step explanation:
The adjusting entry for the interest expense should be recorded at the end of each month to recognize the portion of interest that has accrued during that month. In this case, the company borrowed $100,000 on December 1 at an annual percentage rate (APR) of 12%.
Since the note specifies that no interest payment is due until the note matures on May 31, the December adjusting entry should be recorded on December 31 to reflect the interest expense accrued during the month of December.