Final answer:
The before-tax net income for 2013 will be reduced by $10,000 when the Holly Inc. bonds are classified as other-than-temporarily impaired due to credit losses.
Step-by-step explanation:
The before-tax net income for 2013 will be reduced by $10,000 when Nichols Corporation categorizes the Holly Inc. bonds as other-than-temporarily impaired. This amount represents the credit losses related to the decline in fair value of the investment. However, the noncredit losses will not impact the before-tax net income for 2013.