Everyone wants to know: "How much tax do I actually owe?" The answer depends on your taxable income — which is not the same as your salary, not the same as your bank balance, and definitely not the same as what hits your account every month.
Taxable income is what remains after you subtract all allowable deductions from your gross income. It's the number that gets pushed through the progressive tax bands to determine your actual tax liability. Get this calculation wrong, and you're either overpaying (leaving money on the table) or underpaying (accumulating penalties).
This guide walks you through the complete calculation — step by step — for both employed and self-employed Nigerians under the Nigeria Tax Act (NTA) 2025.
The formula: Gross Income − Allowable Deductions = Taxable Income → Apply progressive tax bands → Your tax liability
The Progressive Tax Bands (NTA 2025)
Before we calculate anything, you need to know the bands. Under the NTA 2025, personal income tax is progressive — meaning different portions of your income are taxed at different rates:
| Taxable Income Band | Rate |
|---|---|
| First ₦800,000 | 0% |
| Next ₦2,200,000 (₦800K – ₦3M) | 15% |
| Next ₦9,000,000 (₦3M – ₦12M) | 18% |
| Next ₦13,000,000 (₦12M – ₦25M) | 21% |
| Next ₦25,000,000 (₦25M – ₦50M) | 23% |
| Above ₦50,000,000 | 25% |
Key insight: The first ₦800,000 of taxable income is tax-free for everyone. This is the personal allowance under NTA 2025. If your total taxable income is ₦800,000 or below, you owe ₦0 in personal income tax.
These bands are progressive, not flat. If your taxable income is ₦5,000,000, you don't pay 18% on the whole amount. You pay 0% on the first ₦800K, 15% on the next ₦2.2M, and 18% on the remaining ₦2M. Your effective rate is much lower than 18%.
For Employed People: The Calculation
If you're a salary earner, here's how to get from your gross salary to your taxable income:
Step 1: Determine Your Annual Gross Income
Add up everything your employer pays you in a year:
- Basic salary
- Housing allowance
- Transport allowance
- Other allowances (meal, utility, leave, medical, etc.)
- Bonuses (13th month, performance bonus)
- Benefits in kind (car benefit, accommodation, etc.)
This total is your annual gross income. It's everything — not just your basic salary.
Step 2: Subtract Mandatory Contributions
These are deducted before tax is applied:
| Deduction | Rate / Amount | Basis |
|---|---|---|
| Pension (employee contribution) | 8% | Basic + Housing + Transport |
| National Housing Fund (NHF) | 2.5% | Basic salary only |
| National Health Insurance (NHIS) | Varies (typically 5% of basic) | If contributing — check with employer |
| Life insurance premiums | Actual amount paid | Only qualifying policies |
Step 3: Apply Rent Relief
Under the NTA 2025, you can deduct 20% of your actual annual rent paid, up to a maximum of ₦500,000. This is a significant relief — but you need proof (rent receipt or tenancy agreement).
- If you pay ₦1,500,000/year rent → 20% = ₦300,000 deduction
- If you pay ₦3,000,000/year rent → 20% = ₦600,000 → capped at ₦500,000 deduction
- If you live in employer-provided accommodation → no rent relief (but the accommodation value may be taxable)
Step 4: Calculate Taxable Income
Taxable Income = Gross Income − Pension − NHF − NHIS − Life Insurance − Rent Relief
Step 5: Apply the Tax Bands
Take your taxable income and apply the progressive bands from the table above. The result is your annual tax liability (what your employer should be deducting as PAYE monthly).
Worked Example 1: Salary earner at ₦300,000/month
Monthly breakdown: Basic ₦150,000 | Housing ₦75,000 | Transport ₦50,000 | Other ₦25,000
Annual gross: ₦300,000 × 12 = ₦3,600,000
Pension (8% of Basic+Housing+Transport): 8% × (₦150K + ₦75K + ₦50K) × 12 = 8% × ₦3,300,000 = ₦264,000
NHF (2.5% of Basic): 2.5% × ₦150,000 × 12 = ₦45,000
Rent relief: Pays ₦1,200,000/year rent → 20% = ₦240,000
Taxable income: ₦3,600,000 − ₦264,000 − ₦45,000 − ₦240,000 = ₦3,051,000
Tax calculation:
First ₦800,000 @ 0% = ₦0
Next ₦2,200,000 @ 15% = ₦330,000
Remaining ₦51,000 @ 18% = ₦9,180
Total annual tax: ₦339,180
Monthly PAYE: ₦28,265
Effective tax rate: 9.4% (much lower than the 18% marginal band)
For Self-Employed People: The Calculation
If you're a freelancer, contractor, or business owner operating as a sole trader, the calculation starts differently — but ends with the same tax bands.
Step 1: Calculate Your Profit
Revenue (total income from your business) − Allowable Business Expenses = Profit
Allowable business expenses include:
- Office rent
- Internet and phone bills (business portion)
- Equipment and tools
- Software subscriptions
- Professional development and courses
- Staff costs (if you have employees)
- Travel for business purposes
- Marketing and advertising
- Professional fees (accountant, lawyer)
- Depreciation on business assets
Important: Only genuinely business-related expenses qualify. Your Netflix subscription, personal groceries, and holiday flights are NOT business expenses — even if you're "self-employed." NRS can disallow expenses that aren't genuinely incurred for business purposes.
Step 2: Subtract Personal Deductions
Just like employed people, self-employed individuals can also deduct:
- Pension contribution: If you contribute to a registered pension scheme (voluntary for self-employed, but recommended)
- NHF: 2.5% of your income if you choose to contribute
- Rent relief: 20% of annual rent, capped at ₦500,000
- Life insurance premiums: Actual amount on qualifying policies
Step 3: Apply the Tax Bands
Your profit minus personal deductions = taxable income. Then apply the same progressive bands as everyone else.
Worked Example 2: Freelancer earning ₦4M revenue with ₦1.5M expenses
Revenue: ₦4,000,000 (total invoiced to clients during the year)
Business expenses: ₦1,500,000 (office rent ₦600K, internet ₦120K, laptop ₦350K, software ₦180K, other ₦250K)
Profit: ₦4,000,000 − ₦1,500,000 = ₦2,500,000
Pension (voluntary, 8%): ₦200,000
Rent relief: Pays ₦900,000/year rent → 20% = ₦180,000
Taxable income: ₦2,500,000 − ₦200,000 − ₦180,000 = ₦2,120,000
Tax calculation:
First ₦800,000 @ 0% = ₦0
Remaining ₦1,320,000 @ 15% = ₦198,000
Total annual tax: ₦198,000
Effective tax rate: 4.95% (on total revenue)
Worked Example 3: Low-Income Earner (Below Threshold)
Not everyone owes tax. The ₦800,000 tax-free threshold means many lower-income earners pay zero personal income tax.
Worked Example 3: Someone earning ₦60,000/month
Monthly breakdown: Basic ₦35,000 | Housing ₦15,000 | Transport ₦10,000
Annual gross: ₦60,000 × 12 = ₦720,000
Pension (8% of Basic+Housing+Transport): 8% × ₦720,000 = ₦57,600
NHF (2.5% of Basic): 2.5% × ₦35,000 × 12 = ₦10,500
Taxable income: ₦720,000 − ₦57,600 − ₦10,500 = ₦651,900
Tax calculation: ₦651,900 falls entirely within the 0% band (first ₦800,000)
Total annual tax: ₦0
This person owes nothing. No PAYE should be deducted from their salary. If their employer is deducting tax, they're doing it incorrectly.
The ₦800K threshold in practice: Anyone earning approximately ₦66,667/month or less (after pension and NHF deductions) will likely fall within the 0% band and owe no personal income tax. This is a significant change from the pre-NTA 2025 regime where minimum tax applied even at low income levels.
Understanding Effective Tax Rate vs. Marginal Rate
Your marginal rate is the rate on your last naira of income. Your effective rate is what you actually pay as a percentage of total income. They're always different with progressive taxes.
| Annual Taxable Income | Marginal Rate | Total Tax | Effective Rate |
|---|---|---|---|
| ₦800,000 | 0% | ₦0 | 0% |
| ₦2,000,000 | 15% | ₦180,000 | 9.0% |
| ₦3,000,000 | 15% | ₦330,000 | 11.0% |
| ₦5,000,000 | 18% | ₦690,000 | 13.8% |
| ₦10,000,000 | 18% | ₦1,590,000 | 15.9% |
| ₦20,000,000 | 21% | ₦3,270,000 | 16.4% |
| ₦50,000,000 | 23% | ₦10,170,000 | 20.3% |
| ₦100,000,000 | 25% | ₦22,670,000 | 22.7% |
Notice how even at ₦100M taxable income, the effective rate is only 22.7% — not 25%. The progressive system means you never pay the top rate on your entire income, only on the portion above ₦50M.
Common Mistakes That Increase Your Tax Bill
Mistake 1: Using Net Salary Instead of Gross
Your tax is calculated on gross income, but the deductions reduce it significantly. Some payroll systems get this wrong — they calculate tax on the gross figure without properly subtracting pension, NHF, and rent relief first. If your payslip shows suspiciously high PAYE, verify the calculation.
Mistake 2: Forgetting to Claim Rent Relief
Rent relief (20% of annual rent, max ₦500,000) is available to everyone who pays rent — but you need to inform your employer and provide documentation. Many salary earners never claim it because nobody told them it exists. If you pay ₦1.5M in rent, that's ₦300,000 off your taxable income — which could save you ₦45,000-₦63,000 in tax depending on your band.
Action step: If you're employed and paying rent, submit your tenancy agreement and rent receipts to your HR/payroll department. Ask them to apply rent relief to your PAYE calculation. Most employers will do this — they just need the documentation.
Mistake 3: Not Deducting Pension Before Applying Bands
Pension contributions come off your gross income before tax is calculated. If your employer is calculating tax on your gross salary without subtracting the 8% pension contribution, you're overpaying. The pension deduction alone can be worth ₦200,000+ in reduced taxable income for mid-level earners.
Mistake 4: Self-Employed People Not Tracking Expenses
If you're freelancing and you don't keep receipts for business expenses, you're taxed on your full revenue instead of your profit. That ₦120,000 annual internet bill, that ₦350,000 laptop, that ₦180,000 in software subscriptions — they all reduce your taxable income. But only if you can prove them.
Mistake 5: Not Knowing About the ₦800K Threshold
Under the NTA 2025, the first ₦800,000 of taxable income is completely tax-free. This is a massive change from previous law. If you're a low-income earner whose taxable income (after deductions) is ₦800K or less, you owe ZERO tax. Make sure your employer knows this — some payroll systems haven't been updated.
Advanced Scenario: Multiple Income Sources
What if you have a salary job AND freelance income? Under the NTA 2025, all your income is aggregated for tax purposes.
Example: Chidi earns ₦4,800,000/year salary and ₦1,200,000/year from freelance web development (after business expenses).
Employment income (after pension, NHF, rent relief): ₦3,800,000
Freelance profit: ₦1,200,000
Total taxable income: ₦5,000,000
Tax on ₦5,000,000:
First ₦800,000 @ 0% = ₦0
Next ₦2,200,000 @ 15% = ₦330,000
Next ₦2,000,000 @ 18% = ₦360,000
Total: ₦690,000
His employer already deducted PAYE on the ₦3,800,000 employment income. When Chidi files his annual return, he declares the freelance income and pays the additional tax on that. His WHT credits from freelance clients (if any deducted 5%) reduce the cash he owes.
What About Company Income Tax (CIT)?
This guide focuses on personal income tax. If you're calculating tax for a limited company, the system is different:
- Small companies (turnover ≤ ₦25M): 0% CIT rate
- Medium companies (₦25M – ₦100M turnover): 20% CIT rate
- Large companies (above ₦100M turnover): 30% CIT rate
CIT is calculated on assessable profit (revenue minus allowable expenses and capital allowances). It doesn't use the progressive personal bands — it's a flat rate applied to company profit.
If you're a sole trader or freelancer, you use the personal income tax bands. If you've incorporated as a limited company, you use CIT rates. The choice of structure affects how much tax you pay — and at higher income levels, incorporating can be advantageous. Speak to a tax adviser about this.
Practical Tools: How Taxly Can Help
If all this calculation feels overwhelming, you're not alone. Most Nigerians don't manually compute their taxable income — and you don't have to either.
When you file your PIT return on Taxly, our accountants handle the computation. You provide your income details and documents (payslips, bank statements), and we calculate your taxable income, apply the correct bands, factor in your deductions, and arrive at the right figure. No spreadsheet gymnastics required.
Not sure how much you owe? Let Taxly calculate it
Submit your income details and documents. Our accountants compute your taxable income, apply deductions, and file your return — correctly.
File on Taxly →Quick Reference: The Full Calculation Checklist
For Employees
- Add all income sources: basic + housing + transport + all allowances + bonuses = Annual Gross
- Subtract pension: 8% × (basic + housing + transport) × 12
- Subtract NHF: 2.5% × basic × 12
- Subtract NHIS: if applicable
- Subtract life insurance premiums: if applicable
- Subtract rent relief: 20% of annual rent, max ₦500,000
- Result = Taxable Income
- Apply progressive bands to get annual tax
- Divide by 12 for monthly PAYE
For Self-Employed
- Total revenue from all business activities
- Subtract allowable business expenses (with receipts)
- Result = Business Profit
- Subtract pension contribution (if making voluntary contributions)
- Subtract NHF (if contributing)
- Subtract rent relief: 20% of annual rent, max ₦500,000
- Result = Taxable Income
- Apply progressive bands to get annual tax
- Subtract WHT credits received during the year
- Pay the balance
Frequently Asked Questions
What if I earn below ₦800,000 — do I still file?
Under the NTA 2025, if your income is below the filing threshold, you may not be required to file. However, filing a nil return establishes your tax compliance record — useful for Tax Clearance Certificates. Consult the current NRS guidelines or file through Taxly to be safe.
Is the rent relief automatic or do I have to claim it?
You have to claim it. For employees, inform your employer's payroll department with documentation (tenancy agreement + receipts). For self-employed people, include it in your annual tax return computation. It's not automatic — if you don't claim it, you don't get it.
Can I backdate rent relief claims?
Generally, you can amend prior-year returns to claim deductions you missed, but this depends on NRS administrative procedures and time limits. Going forward, claim it every year without fail.
What's the difference between tax avoidance and tax evasion?
Tax avoidance is legal — using legitimate deductions, reliefs, and structures to minimize your tax within the law. Claiming rent relief, deducting pension, and tracking business expenses are all legal avoidance. Tax evasion is illegal — hiding income, falsifying records, or not filing returns. Everything in this guide is legal avoidance. Use it.
Key Takeaways
- Taxable income = Gross income minus all allowable deductions — not your bank balance
- The first ₦800,000 is tax-free under NTA 2025 — a significant relief for lower earners
- Deduct pension (8%), NHF (2.5%), and rent relief (20% of rent, max ₦500K) BEFORE applying tax bands
- Progressive bands mean your effective rate is always lower than your marginal rate
- Self-employed: track all business expenses — they directly reduce your tax
- Multiple income sources are aggregated — declare everything in your annual return
- Common mistakes: not claiming rent relief, using net instead of gross, not deducting pension first