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Withholding Tax (WHT) is an advance payment of income tax that is deducted at the source of a transaction. For many business owners in Nigeria, calculating this correctly is the difference between a smooth audit and a massive fine. In 2026, the Nigeria Revenue Service (NRS) has tightened the rules around these deductions, making it essential to understand the math behind the mandate.
The Core Formula for WHT
The calculation for Withholding Tax is straightforward, but the application depends on the nature of the transaction. The formula is:
WHT Amount = Gross Invoice Amount × Applicable Tax Rate
Net Payment to Vendor = Gross Invoice Amount – WHT Amount
For example, if you hire a consultant for a ₦1,000,000 project and the applicable rate is 10%, you deduct ₦100,000. You pay the consultant ₦900,000 and remit the ₦100,000 to the NRS. To understand which rate applies to your vendor, see our WHT Rates in Nigeria (Updated 2026 Guide).
Step-by-Step Calculation Process
- Identify the Transaction Type: Is it a service, a supply, or a technical fee?
- Verify the Vendor Status: Is the vendor a Limited Liability Company or an individual/enterprise? This determines if the tax goes to the NRS or the State. Read more in Federal vs State Taxes Explained.
- Confirm the TIN: If the vendor does not have a Tax Identification Number (TIN), you must double the tax rate (e.g., 5% becomes 10%).
- Apply the Rate: Calculate the deduction based on the gross amount before VAT.
Practical Example: Office Rent
If your annual office rent is ₦5,000,000, the WHT rate for rent is 10%. You must deduct ₦500,000 and remit it. If you fail to do this, you face tax penalties in Nigeria. For official calculators and guidelines, you can visit the NRS Portal or consult PwC Nigeria for corporate tax advisory.”