You may be able to deduct the property taxes on vacant land held for investment, but you must itemize personal deductions to do so. These taxes are not subject to the limitation on state and local taxes, which include real estate taxes on personal use property (e.g., your personal residence). Note: Different rules apply to individuals who are dealers in property.
Interest on debt used to carry investments, but not including interest expense from a passive activity. Deductions are limited to net investment income.