To determine how much of Tina's actual vehicle expenses she can deduct for business use, we first need to establish the proportion of her total vehicle use that is attributed to business.
- Total miles driven: 8,000 miles
- Business miles driven: 2,000 miles
Now, we calculate the business use percentage:
\[ \text{Business use percentage} = \frac{\text{Business miles}}{\text{Total miles}} = \frac{2,000 \text{ miles}}{8,000 \text{ miles}} = 0.25 \text{ or } 25% \]
Next, we apply this percentage to the actual expenses incurred:
\[ \text{Deductible expenses} = \text{Total actual expenses} \times \text{Business use percentage} = 4,000 \times 0.25 = 1,000 \]
Therefore, the amount of her actual expenses that Tina can deduct as a vehicle expense on her Schedule C (1040), line 9, is $1,000.