The following deductions are disallowed in DC and must be added back if they were included in your federal income:
- Personal, living, or family expenses
- Any amount paid out for new buildings or for permanent improvements or betterments, made to increase the value of any property or estate
- Any amount expended in restoring property or in making good the exhaustion thereof for which an allowance is or has been made
- Expenses incurred to produce income which is either exempt or not subject to taxation
- Deductible interest expense or intangible expense paid to related members in connection with direct or indirect transactions
See DC Code 47-1803.03(d) for more information about what deductions are not allowed.