How can Beth calculate the business part of her mortgage interest?

To determine the business portion of her mortgage interest, Beth should consider the percentage of the home that is used for business purposes. This approach is in line with standard tax practices, where mortgage interest can be deducted based on the portion of the home utilized for business activities. By multiplying the total interest paid on the mortgage by the percentage of the home's space that is dedicated to the business, she accurately allocates the relevant expenses related to her business usage.

This method aligns with IRS guidelines for claiming business use of a home, ensuring that she can appropriately benefit from the interest deduction while remaining compliant with tax regulations. The calculation provides a clear and fair reflection of the business expenses attributable to her home office or business activity.