In Nigeria, a single invoice can trigger three different taxes, at three different points in time, under three different rules.

You issue an invoice. VAT is added. Your client pays. WHT is deducted. The year closes. CIT is assessed.

Most finance teams understand this in theory. The breakdown happens in practice, when VAT ledgers go unreconciled, WHT credit notes go missing, and CIT provisions get assembled under pressure at year-end. The result: distorted cash flow, inaccurate reporting, and unnecessary exposure when NRS comes knocking.

 The big NRS picture: Three taxes, Three layers

Before going deep on each, it helps to understand where each tax sits in your financial cycle.

They are not interchangeable. They do not replace each other. But they interact  and that interaction is where most operational tax errors occur.

Part 1: Value Added Tax (VAT)

Rate: 7.5% | Filing: Monthly by the 21st | Administered by: NRS

VAT is a consumption tax. The economic burden falls on the final consumer, not your business. Your company is the collection agent: you charge VAT on taxable supplies, collect it from customers, and remit the net balance to NRS after deducting what you've already paid on eligible purchases.

VAT Payable = Output VAT − Input VAT

Example:

A logistics company with ₦10m in taxable sales and ₦3m in qualifying taxable purchases:

If Input VAT exceeds Output VAT, you are in a credit position, carried forward or refunded subject to NRS approval, though refund processing remains slow in practice.

The ₦100 Million threshold businesses with annual turnover below ₦100 million are exempt from charging VAT. Once you cross that threshold, VAT charging becomes mandatory.

Zero-rated vs Exempt - A distinction that costs money

This is one of the most misunderstood areas of Nigerian VAT, and misclassification has real financial consequences.

A business that misclassifies taxable services as exempt loses the right to recover VAT paid on inputs, office leases, equipment, subscriptions. That is a silent, compounding cost embedded in your expense base.

What Input VAT cannot be claimed: Non-business expenses, entertainment costs, and purchases from unregistered vendors are ineligible. Claiming input VAT on these is one of the most common NRS audit adjustment areas.

Filing Deadlines and Penalties: VAT returns are due on the 21st of the following month. Late filing attracts a minimum penalty of ₦100,000 for the first month and ₦50,000 for each subsequent month, plus interest on unpaid balances.

VAT also shapes pricing decisions, contract terms, and working capital planning. The cash collected from customers must not be treated as available for operations, it belongs to NRS.

Part 2: Withholding Tax (WHT)

Remittance deadline: Within 21 days of deduction (companies) | Administered by: NRS

WHT is not a separate tax. It is an advance payment of income tax, deducted at source on qualifying payments, professional services, rent, dividends, interest, royalties, and contracts.

The Mechanics: What actually happens on a payment

Scenario: Your company engages an IT consultant (Corporate company)

Invoice amount: ₦2,000,000.

The consultant receives ₦1,900,000 and a WHT credit note for ₦100,000. At year-end, they apply that credit against their CIT liability. Your obligation does not end at deduction, it ends at remittance, with documentation.

Active vs passive income: For active business income, WHT is a creditable advance against CIT. For certain passive income, dividends and interest in specific circumstances, WHT may constitute a final tax. Misclassifying these streams leads to either over claiming or under claiming credits at year-end.

The credit note problem: WHT credit notes are receipts for tax already paid. Without them, you cannot claim the credit.

Common failures: vendors never issue credit notes; credit notes are lost or never collected; year-end CIT proceeds without applying available credits. This is effectively double taxation, not because the law requires it, but because of process failure. Businesses that track WHT credit notes systematically consistently pay less CIT than those that don't.

Part 3: Company Income Tax (CIT)

Rate: 0% (turnover below ₦100m) / 30% (turnover above ₦100m) | Filing: Within 6 months of financial year-end

CIT is an annual tax on a company's taxable profit, not revenue, not turnover, not gross income.

It is assessed once per financial year, computed after the books are closed and adjusted for tax purposes.

The formula: Taxable Profit = Total Revenue − Allowable Expenses − Capital Allowances + Disallowable Items-Loss relief (if any)

Current CIT Rates (2026)

The tiered structure means a company near a threshold has a material incentive to understand exactly what counts as turnover for classification purposes.

Allowable vs disallowable expenses: Allowable deductions include interest on business debt, rent, employee costs, repairs and maintenance, pension contributions, bad debts, and R&D expenses. Disallowable items include capital expenditure, depreciation, personal expenses, taxes on profits, unapproved pension contributions, penalties and fines, and VAT on non-compliant transactions.

A company with ₦500m revenue and ₦350m in costs, but ₦40m of those costs disallowed, is not taxed on ₦150m. It is taxed on ₦190m. Expense classification is a direct driver of tax liability.

Capital allowances: Accounting depreciation is not deductible for CIT purposes. Instead, the NTA provides capital allowances at prescribed straight-line rates over an asset's useful life. VAT and import duties must have been paid on qualifying assets. A company that purchases ₦20m of equipment and qualifies for a 20% annual allowance can deduct ₦4m annually, directly reducing taxable profit. Failing to claim these allowances leaves significant reductions on the table.

Loss carry-forward: Losses can be carried forward and offset against future taxable income. A company that records a ₦30m loss in Year 1 and ₦80m profit in Year 2 is taxed on ₦50m, not ₦80m. Without tracking that prior loss, your finance team overpays by approximately ₦9m at a 30% rate.

Example:

Without tracking the 2023 loss, the 2024 CIT computation would be based on ₦80m — an overpayment of approximately ₦9m at a 30% rate.

Loss tracking is a multi-year tax planning instrument. Many finance teams treat it as a historical accounting note. That is a costly mistake.

Capital allowances: The legal way to reduce CIT

Under Nigerian tax law, depreciation is not an allowable deduction for corporate income tax purposes. Instead, the Nigeria Tax Act (NTA) provide for capital allowances, which are prescribed rates allowing businesses to deduct the cost of qualifying assets from taxable income over time.

This means that while accounting depreciation reduces reported profit, taxable income is adjusted using capital allowances rather than accounting depreciation.

Capital allowance is a tax deduction that allows a business to write off the cost of certain qualifying capital assets (e.g., buildings, plant, equipment) over time against its taxable profit. Under the Nigeria Tax Act 2025, the system has been simplified compared with the old initial/annual allowance regime:

• Only annual allowance applies. The old initial allowance concept has been removed. 

• Capital allowances are claimed on a straight-line basis over the useful life of the asset. 

• VAT or import duties must have been paid on assets for them to qualify. 

• Capital allowance on assets used partly for generating taxable profit is prorated unless non-taxable income is less than 10% of total income. 

• A notional 1% of the asset cost must be retained in computation records until disposal (for statistical purposes).

  
  

The WHT–CIT Link: Closing the Loop

This is where Part 2 and Part 3 connect.

WHT deducted from payments received during the year accumulates as a tax credit, which is applied against your CIT liability at year-end.

If those WHT credit notes were not collected or tracked, your finance team presents a ₦18m liability to the business not ₦13.8m. That ₦4.2m gap is not a tax law problem. It is a documentation problem.

Part 4: How all three interact on a single transaction

A Lagos management consulting firm invoices a corporate client ₦10,000,000.

• Step 1: Invoice issued

The consulting firm must collect and remit the ₦750,000 VAT to NRS by the 21st of the following month.

• Step 2: Payment is made

  The client deducts WHT before paying:

  Line Item	Amount
  Invoice total	₦10,750,000
  Less: WHT on professional services (5% of ₦10m)	(₦500,000)
  Net payment received	₦10,250,000

  
  

  The client remits ₦500,000 to NRS and issues a WHT credit note for the same amount to the consulting firm.

  
  

• Step 3: Year-end CIT computation

  The ₦10m fee forms part of the consulting firm's annual revenue. After deducting allowable expenses and capital allowances, say the taxable profit is ₦2,500,000.

  
  

  CIT at 30% (Large company) = ₦750,000
  Less: WHT credit = (₦500,000)
  Net CIT payable = ₦250,000

  In this scenario, the WHT already collected exactly offsets the CIT liability on this income. Without the credit note, ₦500,000 is paid twice.

  
  

  What this illustrates:

  Three taxes. One transaction. Three different timings. Without the credit note from Step 2, ₦500,000 is paid twice. That is not a tax law problem, it is a documentation problem.

  
  

Part 5: Compliance calendar - What needs to happen and when

For a company with a December year-end, CIT is due by June 30. For a company with a March year-end, CIT is due by September 30.

The filing deadline is fixed relative to your financial year, not to the calendar year.

Summary: The one-page reference

Operating principle for 2026

VAT accumulates monthly. WHT obligations arise with every qualifying payment. CIT is shaped by decisions made all year, on expenses, assets, and credits. Not just what the accountant prepares at filing time.

The businesses that manage these well run tight, continuous processes: reconciling VAT monthly, tracking WHT credits per transaction, maintaining capital allowance schedules throughout the year. The ones who struggle are operating without the right infrastructure and are paying for it in penalties, overpayments, and audit adjustments.

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