Company Income Tax (CIT) Allowable Deductions: Reducing Tax Exposure Legally
A breakdown of the statutory rules governing wholly, reasonably, exclusively, and necessarily incurred business expenses.
Company Income Tax (CIT) Allowable Deductions
When computing assessable profit for Company Income Tax (CIT) in Nigeria, the tax authority does not simply accept accounting net profit. Adjustments are required to distinguish between tax-deductible (allowable) expenses and non-allowable expenditures.
Understanding the statutory test of deductibility is key to ensuring your enterprise does not overpay corporate income tax.
The WREN Test: Wholly, Reasonably, Exclusively, and Necessarily
Under the Companies Income Tax Act (CITA), an expenditure is allowable as a deduction only if it passes the WREN criteria:
1. Wholly: Incurred entirely for business operations without mixed private use.
2. Reasonably: The quantum of the expense is justifiable and consistent with commercial norms.
3. Exclusively: Directed specifically towards generating assessable corporate revenue.
4. Necessarily: Essential to the operational function of the enterprise.
Common Allowable vs. Disallowable Items
Allowable Business Deductions:
- Salaries, wages, and statutory employer pension contributions.
- Rent paid for commercial and operational premises.
- Interest paid on loans deployed directly into business operations.
- Repairs and maintenance of machinery and physical business assets.
- Bad debts written off in accordance with established recovery procedures.
Disallowable Expenditures:
- Capital expenditures (which are instead compensated via Capital Allowances).
- Depreciation of fixed assets (statutorily replaced by tax capital allowances).
- Fines, statutory penalties, and late filing surcharges.
- Personal expenses or non-business entertainment expenditures.
Maintaining pristine supporting documentation—including supplier receipts, signed contracts, and delivery notes—is vital during routine tax desk reviews.
Statutory Educational Disclaimer: This article is published solely for educational purposes and regulatory awareness. It does not constitute formal tax or legal advisory for individual business transactions. Consult licensed practitioners or the relevant revenue authority for official rulings.
Mubarak Aminu
·Founder & Tax ConsultantMubarak Aminu is the founder of The Tax Cup and of MLAZ Limited. A tax consultant with 3+ years' experience in PAYE, VAT and audit support, and an ICAN finalist, he explains Nigerian tax in plain language.