2. Robert is focused on customer satisfaction, and he therefore offers all of his customers a $500 refund if they are not fully satisfied with his work. Five of the homeowners in the neighborhood requested a refund when they inspected his work on December 31, 2020. Given the New Year's holiday, Robert did not pay the refunds until January 12, 2021. Robert does not use the recurring item exception. When can Robert deduct the refund payments, and why