Ask a dozen business owners what company income tax means and you’ll get twelve different answers. Some will tell you it’s 30% of everything that comes into your account. Others will insist small companies pay nothing. A few might have heard whispers about something called “Development Levy” but couldn’t explain it if you asked.

Here’s the truth: company income tax changed dramatically in 2026. The old rules you knew—the small company threshold, the separate levies, the way foreign companies were taxed—most of it is different now. And if you’re operating on last year’s understanding, you’re probably getting it wrong.

Let’s walk through what company income tax actually means in 2026, who pays what, and how to structure your business so you’re not overpaying—or underpaying until the penalties find you.

What Company Income Tax Actually Is

Company Income Tax (CIT) is tax charged on the profits of registered companies in Nigeria. Not revenue. Not every transaction that hits your account. Profits.

If you’ve registered a business as a:

• Limited Liability Company
• Limited by Guarantee
• Incorporated Trustees (with conditions)

…you pay Company Income Tax to the Nigeria Revenue Service (NRS) —formerly FIRS.

This is the fundamental split in Nigeria’s tax system: individuals pay Personal Income Tax to their state governments. Companies pay Company Income Tax to the federal government. The personal income tax in Nigeria guide covers the other side of this divide.

The confusion usually starts because business owners think “company” means any business. It doesn’t. If you’re running a sole proprietorship or partnership without incorporation, you’re not in the company tax net—you pay personal income tax through direct assessment. If you’ve incorporated, you’re now in federal territory.

The Three Company Categories in 2026

The 2026 reforms completely redrew the lines around who pays what. There are now three distinct categories, and which one you fall into determines everything.

Small Companies

Turnover ≤ ₦50 million AND fixed assets ≤ ₦250 million

If you meet both conditions, you’re officially a small company. And the benefits are better than they’ve ever been:

• 0% Company Income Tax on all profits
• Exempt from Capital Gains Tax entirely
• Exempt from Development Levy (the new single levy that replaced multiple old taxes)

That’s right—no CIT, no CGT, no levy. Zero.

But—and this is where people get caught—you still have obligations:

• You must file annual returns (non-filing attracts penalties)
• You still deduct and remit PAYE on employee salaries
• You still charge and remit VAT where applicable
• You still deduct withholding tax on eligible payments

The exemption is from paying tax on your profits. It’s not an exemption from the entire tax system. The penalties for late or non-payment of tax in Nigeria article breaks down what happens if you confuse the two.

Medium to Large Companies

Turnover > ₦50 million

Once your turnover crosses ₦50 million, you’re in the full regime:

• Company Income Tax: 30% on taxable profits
• Capital Gains Tax: 30% on chargeable gains (increased from 10% in 2026)
• Development Levy: 4% on assessable profits (explained below)

The Capital Gains Tax increase caught many businesses off guard. It’s now harmonized with the CIT rate, so selling assets attracts the same tax rate as trading profits.

Very Large Companies and Multinationals

Turnover > ₦50 billion OR part of a multinational group

If you’re in this bracket, there’s an additional layer: a 15% minimum effective tax rate (ETR). Even if your calculations show lower tax, you pay at least 15% of profits. This aligns Nigeria with the global minimum tax framework and prevents profit shifting to low-tax jurisdictions.

The current income tax rates in Nigeria guide includes detailed examples of how this minimum tax applies.

The Development Levy: What Replaced Everything

If you’ve been paying Tertiary Education Tax, IT Levy, NASENI Levy, and Police Trust Fund Levy separately, you can stop. They’re all gone.

The 2026 reforms consolidated them into a single 4% Development Levy charged on assessable profits for companies with turnover above ₦50 million.

How it works:

• Calculate your assessable profit (same base as CIT)
• Apply 4%
• Pay it alongside your CIT

For example, if your assessable profit is ₦100 million:

• CIT (30%): ₦30 million
• Development Levy (4%): ₦4 million
• Total: ₦34 million

Small companies (under ₦50 million turnover) are completely exempt from the levy.

What Counts as Taxable Profit Now

Taxable profit starts with your accounting profit (what your books show as profit). Then you adjust it for tax purposes:

Add back:

• Expenses not wholly, reasonably, exclusively, and necessarily incurred for the business
• Capital expenses (these are treated differently)
• Provisions and reserves (unless specific rules allow them)
• Fines and penalties
• Certain entertainment expenses
• Payments where withholding tax wasn’t deducted (new 2026 rule)

Deduct:

• Capital allowances (depreciation calculated the tax way, not the accounting way)
• Losses carried forward (up to four years, with conditions)
• Specific exemptions allowed by law
• Group relief where applicable

The result is your assessable profit. Tax and levy are charged on this number, not what your management accounts show.

This is why two identical businesses with the same revenue can pay completely different tax—one structures its affairs to claim everything legitimately available, the other pays based on whatever the accountant roughly calculates.

The taxable vs non-taxable income in Nigeria guide walks through exactly what counts and what doesn’t, with 2026-specific examples.

Minimum Tax: The 2026 Overhaul

The minimum tax rules were completely rewritten.

For Most Companies (Turnover ≤ ₦50 billion)

The old 0.5% of gross turnover minimum tax still applies. If your calculated tax is lower than 0.5% of turnover, you pay the 0.5% instead.

For Very Large Companies (Turnover > ₦50 billion or Multinational Groups)

A new 15% minimum effective tax rate applies. This overrides any lower calculation. If your effective tax rate falls below 15%, you top it up to 15%.

For Non-Resident Companies

A minimum tax of 4% of income or the applicable withholding tax rate applies, whichever is higher.

The logic is simple: the tax authority doesn’t want companies trading year after year declaring losses while owners live well, and they don’t want multinationals shifting profits offshore. Minimum tax ensures every company contributes something.

The minimum tax in Nigeria explained article covers the exceptions and how to calculate it correctly under the new rules.

How to Calculate Company Income Tax (2026 Method)

Let’s walk through a real example for a medium-sized company.

Company A:

• Turnover: ₦100 million
• Allowable expenses: ₦70 million
• Accounting profit: ₦30 million
• Capital allowances claimed: ₦5 million
• Loss brought forward: ₦2 million

Step 1: Start with accounting profit: ₦30 million
Step 2: Adjust for tax (add back disallowed expenses, deduct capital allowances): ₦30 million – ₦5 million = ₦25 million
Step 3: Deduct losses brought forward: ₦25 million – ₦2 million = ₦23 million
Step 4: Apply CIT rate (30%): ₦23 million × 30% = ₦6.9 million
Step 5: Apply Development Levy (4%): ₦23 million × 4% = ₦920,000
Step 6: Total tax payable: ₦6.9 million + ₦920,000 = ₦7.82 million

Check minimum tax (0.5% of turnover): ₦100 million × 0.5% = ₦500,000
Calculated tax (₦7.82 million) is higher, so company pays ₦7.82 million.

For a very large company with turnover of ₦60 billion and calculated tax of ₦8 billion (13.3% effective rate), the 15% minimum would apply: ₦60 billion × 15% = ₦9 billion payable.

Filing and Payment Deadlines

Company income tax runs on a calendar year basis (January to December) unless your company chooses a different accounting date.

Key dates:

• Estimated returns: Due within six months of your accounting year-end (tell the NRS what you expect to earn and pay in installments)
• Final returns: Due within six months of your accounting year-end (actual figures)
• Payment: Tax is payable in installments based on your estimated returns, with the final balance due on filing

Late filing attracts ₦100,000 in the first month and ₦50,000 for each subsequent month. Late payment attracts 10% penalty plus interest at the Central Bank’s Monetary Policy Rate (currently over 25%).

New for 2026: Failure to deduct withholding tax on eligible payments now attracts a 40% administrative penalty on the amount not deducted. This applies even if you later pay the tax yourself—the penalty is separate.

The penalties for late or non-payment of tax in Nigeria guide breaks down exactly how these compound if you ignore them.

E-Invoicing: The Game Changer

If you haven’t heard about e-invoicing yet, you will. The 2026 reforms mandate electronic invoicing for all VAT-registered businesses, with phased implementation:

• Large taxpayers (turnover > ₦5 billion): Compliance enforcement starts April 2026
• Medium taxpayers (₦1 billion – ₦5 billion): Go-live July 1, 2026
• Emerging taxpayers (< ₦1 billion): Go-live July 1, 2027

What this means: all invoices must be issued through NRS-approved systems, automatically transmitted to the tax authority in real-time. Under-invoicing, fake expenses, and phantom transactions become nearly impossible to hide.

If your business falls into the first category and you’re not e-invoicing ready by April 2026, expect penalties.

Foreign Companies and the New Rules

If you’re a foreign company doing business in Nigeria, the 2026 rules expanded your tax exposure.

You’re liable for Company Income Tax if you have a permanent establishment in Nigeria—a fixed place of business, a dependent agent concluding contracts, or significant economic presence.

Key changes:

• Force of attraction rule: If you have a permanent establishment, all income from Nigerian sources is now taxable, not just income through the PE
• EPC contracts: Engineering, procurement, and construction contracts are now taxable even if partly performed offshore
• Significant economic presence: Now limited to digital services only (clarifying what was previously vague)

Non-resident companies face minimum tax of 4% of income or the applicable withholding tax rate.

The how Nigerian tax system compares with other countries article covers which double taxation treaties exist and how they affect your liability.

Free Zone Companies: Tighter Rules

If you operate in a free trade zone, pay attention. The rules just got stricter.

Full tax exemption applies only to exports. If you sell more than 25% of your goods or services into the Nigerian customs territory, a proportionate part of your income becomes taxable.

And from 2028, all sales into the customs territory will be fully taxable regardless of proportion. The transition period ends in two years.

Controlled Foreign Company Rules

New for 2026: if your Nigerian company controls a foreign subsidiary (more than 50% ownership or effective control), the undistributed profits of that subsidiary may now be taxable in Nigeria.

The rules target profit shifting—parking profits in low-tax jurisdictions while the real economic activity happens in Nigeria. If the foreign subsidiary pays tax at less than 15% effective rate, a portion of its profits may be attributed back to the Nigerian parent.

This is complex and requires specialist advice if it applies to you.

Records You Must Keep

The NRS can request to see your records for up to six years after a transaction. If you can’t produce them, your deductions can be disallowed.

You need:

• Statutory accounts (profit and loss, balance sheet)
• Tax computations showing how you arrived at taxable profit
• Receipts and invoices for all expenses claimed
• Asset register for capital allowance claims
• Evidence of taxes paid (PAYE, VAT, WHT)
• All relevant returns filed
• E-invoices (once the system is live)

The how to keep proper tax records in Nigeria guide includes templates and practical advice for businesses of different sizes.

Common Mistakes That Trigger Audits

The NRS doesn’t audit randomly. They audit based on flags.

Red flags include:

• Consistent losses while directors live well
• Expenses that don’t match business size
• Significant related-party transactions
• Late filing history
• Industry averages that don’t match your declared figures
• Large claims for exempt income
• Failure to deduct WHT on eligible payments

If you’re flagged, expect a tax audit. The income tax audit in Nigeria article walks through what happens, what they look for, and how to prepare.

The Bottom Line

Company income tax in 2026 is not your father’s company income tax. The thresholds changed. The rates changed. The levies consolidated. The enforcement mechanisms digitized.

If you’re a small company (turnover ≤ ₦50 million, fixed assets ≤ ₦250 million), you pay zero CIT, zero CGT, zero Development Levy. But you must file returns and comply with all other tax obligations.

If you’re a medium or large company, you pay 30% CIT, 30% CGT on chargeable gains, and 4% Development Levy on assessable profits.

If you’re a very large company or multinational, you face a 15% minimum effective tax rate and CFC rules.

If you’re a foreign company, your Nigerian tax exposure just expanded.

The key is understanding where your business sits in this structure. Get it wrong and you either overpay or underpay. Overpaying leaves money on the table. Underpaying builds exposure until the audit finds you.

The system exists. It applies whether you engage with it or not. The only choice is whether you navigate it with clarity or catch-up.