How to Calculate Your Income Tax in Nigeria
Understanding how to calculate your income tax in Nigeria is essential whether you are a salaried employee, business owner, freelancer, or side hustler. Many Nigerians see deductions on their payslip but do not fully understand how those figures are computed. This guide breaks it down in a simple, relatable, and structured way so you can confidently calculate your Personal Income Tax (PIT) yourself.
Income tax for individuals in Nigeria is regulated by the Personal Income Tax Act (PITA) and administered by the Federal Inland Revenue Service (FIRS) and State Internal Revenue Services.
Read More: Who pays personal income tax
Step 1: Determine Your Annual Gross Income
Your gross income is your total earnings before any deductions. It includes:
- Basic salary
- Allowances (housing, transport, utility, etc.)
- Bonuses
- Commissions
- Benefits-in-kind
If you earn ₦200,000 monthly, your annual gross income is:
₦200,000 × 12 = ₦2,400,000
Step 2: Deduct Statutory Contributions
Before calculating tax, certain mandatory deductions are removed from your gross income. These typically include:
- Pension contribution (minimum 8% for employees under the Contributory Pension Scheme)
- National Housing Fund (NHF) contribution (2.5% of basic salary)
- National Health Insurance Scheme (if applicable)
- Life assurance (if paid by employee)
These deductions reduce your taxable income.
Example: Annual Gross Income = ₦2,400,000
Pension (8%) = ₦192,000
New total after pension deduction: ₦2,400,000 – ₦192,000 = ₦2,208,000
Step 3: Apply Consolidated Relief Allowance (CRA)
Nigeria uses something called the Consolidated Relief Allowance (CRA) to reduce taxable income.
The CRA is calculated as:
₦200,000 or 1% of gross income (whichever is higher) PLUS 20% of gross income
Using our example: Gross Income = ₦2,400,000
1% of ₦2,400,000 = ₦24,000, Since ₦200,000 is higher than ₦24,000, we use ₦200,000.
Now calculate 20% of gross income: 20% × ₦2,400,000 = ₦480,000
Total CRA: ₦200,000 + ₦480,000 = ₦680,000
Step 4: Calculate Your Taxable Income
Now subtract: Pension contribution, Consolidated Relief Allowance From gross income.
Gross Income: ₦2,400,000 Less Pension: ₦192,000 Less CRA: ₦680,000
Taxable Income: ₦2,400,000 – ₦192,000 – ₦680,000 = ₦1,528,000
This is the amount that will now be taxed.
Step 5: Apply Nigeria’s Graduated Tax Rates
Nigeria uses a progressive tax system, meaning different portions of your income are taxed at different rates.
The tax bands under the Personal Income Tax Act are:
- First ₦300,000 → 7%
- Next ₦300,000 → 11%
- Next ₦500,000 → 15%
- Next ₦500,000 → 19%
- Next ₦1,600,000 → 21%
- Above ₦3,200,000 → 24%
Now apply this to the taxable income of ₦1,528,000.
Breakdown: First ₦300,000 × 7% = ₦21,000
Next ₦300,000 × 11% = ₦33,000
Next ₦500,000 × 15% = ₦75,000
Remaining ₦428,000 × 19% = ₦81,320
Total Tax Payable: ₦21,000 + ₦33,000 + ₦75,000 + ₦81,320 = ₦210,320
Step 6: Divide by 12 for Monthly PAYE
To know your monthly deduction under Pay-As-You-Earn (PAYE): ₦210,320 ÷ 12 = ₦17,527 (approximately)
That is what your employer will deduct monthly.
What If You’re Self-Employed?
If you are a freelancer, business owner, or entrepreneur:
- You calculate your annual profit (Revenue – Expenses).
- Apply allowable deductions.
- Apply CRA.
- Use the same tax bands.
- File returns with your State Internal Revenue Service.
Self-employed individuals must file annual tax returns even if they are not under PAYE.
Quick Summary Formula
To calculate your income tax in Nigeria:
- Calculate Annual Gross Income
- Subtract Pension and other statutory deductions
- Subtract Consolidated Relief Allowance (CRA)
- Apply graduated tax rates
- Divide by 12 for monthly PAYE
You can use our calculator to estimate tax payable
Calculating your income tax in Nigeria is not as complicated as it seems once you understand the structure. The key is knowing your gross income, applying the correct reliefs, and using the graduated tax bands properly.
As a finance student or working professional, learning how to calculate your income tax gives you financial awareness and control. Instead of guessing what is deducted from your salary, you can now verify it confidentqly.
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