The following are eight items specifically disallowed by the Petroleum Profits Tax Act (PPTA) in ascertaining the adjusted profit of an accounting period:

1. Capital Expenditures:
   Expenses related to the purchase of fixed assets, such as buildings, machinery, and vehicles, are not allowed as deductions under the PPTA.
2. Income Tax:
   Income tax paid or payable, including taxes levied by the Federal or State Governments, is not deductible for the purposes of calculating adjusted profit.
3. Dividends Paid:
   Dividends distributed to shareholders are not allowed as a deduction in computing adjusted profits.
4. Salaries and Wages (Excessive or Unreasonable):
   Salaries and wages that are deemed excessive or unreasonable relative to the company’s operations or industry standards may be disallowed.
5. Penalties and Fines:
   Any penalties or fines imposed by tax authorities, regulatory bodies, or courts are not deductible in the computation of adjusted profit.
6. Bad Debts Written Off (Unjustified):
   Bad debts that are written off without sufficient evidence of being irrecoverable are not allowed as deductions.
7. Donations and Gifts (Excessive):
   Donations or gifts made by the company that exceed the acceptable limit are not allowed as deductions.
8. Interest on Overdue Tax:
   Interest paid on overdue tax liabilities is not deductible in the calculation of adjusted profit.