Final answer:
Mary's total business deduction for the vehicle use is calculated by using the standard mileage rate for the business miles driven and applying the percentage of business use to the interest and property tax paid. The total business deduction amounts to $8,656.
Step-by-step explanation:
To calculate Mary’s total business deduction for the business use of her vehicle, we need to consider both the standard mileage rate for the business miles driven and the proportion of the interest and property tax that is deductible based on the business use of the vehicle.
For the tax year 2021, the IRS allows a standard mileage rate deduction. Assuming the standard mileage rate is 56 cents per mile for business miles driven, we can multiply this rate by the business miles driven to determine that part of the deduction:
12,600 miles x $0.56/mile = $7,056
Since Mary used her vehicle for 80% business purposes, we then calculate 80% of the interest and property tax she paid:
$1,500 (interest) + $500 (property tax) = $2,000
80% of $2,000 = $1,600
Therefore, to sum up, the total business deduction for the vehicle use would be:
$7,056 (standard mileage rate deduction) + $1,600 (interest and property tax deduction for business use) = $8,656.