Final answer:
Topham's taxable income is $78,000.
Step-by-step explanation:
Taxable income is calculated by adjusting the total income for permanent items that affect the tax liability. In this case, the tax-exempt income of $3,000 is excluded from taxable income. The meals expenses of $8,000 are not deductible for tax purposes, and the depreciation expense of $15,000 is adjusted to the tax rules depreciation of $10,000. The estimated income tax payments of $21,000 are subtracted from the taxable income.
Therefore, Topham's taxable income can be calculated as follows:
Taxable income = Pretax income - Tax-exempt income - Non-deductible expenses + Adjusted depreciation - Estimated income tax payments
Taxable income = $100,000 - $3,000 - $8,000 + $10,000 - $21,000 = $78,000