What Taxes Does FIRS Charge on Investment Income in Nigeria?

Nigerian investors carry two separate obligations to the Federal Inland Revenue Service (FIRS): one on income generated while they hold an asset (dividends, interest, rental yields) and a second when they dispose of it (capital gains). The two regimes sit in different statutes, carry different rates and interact in ways that trip up even experienced market participants.

The primary legislation is the Capital Gains Tax Act (CGTA) Cap C1, LFN 2004, which imposes a flat 10% charge on gains arising from the disposal of chargeable assets. The Companies Income Tax Act (CITA) and the Personal Income Tax Act (PITA) then govern investment income earned in the ordinary course of holding: dividends, interest payments and rental proceeds. The Finance Act 2021 and the Finance Act 2023 introduced amendments that broadened the scope of taxable disposals and tightened WHT remittance timelines.

The distinction matters because many retail investors on the Nigerian Exchange (NGX) focus entirely on Withholding Tax (WHT) notices they receive from stockbrokers and assume their tax obligation ends there. It does not.

Capital Gains Tax: the 10% flat rate explained

Under Section 2 of the CGTA, any gain accruing to a person from the disposal of a chargeable asset is liable to CGT at 10%. Chargeable assets include land, buildings, securities (shares, stocks, bonds), rights and goodwill. Gains on government securities (Federal Government Bonds, Nigerian Treasury Bills and similar instruments) are exempt under Section 26 of the same Act — a material carve-out that has driven significant retail participation in the fixed-income market.

The taxable gain is the disposal proceeds minus the allowable expenditure: the original acquisition cost, incidental costs of acquisition (broker commissions, stamp duties), and expenditure incurred wholly and exclusively to enhance the value of the asset. Inflation adjustments are not available under Nigerian law; the gain is computed in nominal naira terms.

As at June 2026, the naira trades at approximately ₦1,580 per dollar on the official NAFEM window, according to CBN data. An investor who purchased NGX-listed equities with the equivalent of $10,000 (about ₦9.5 million at the time of purchase) and now holds securities worth ₦18 million faces a paper gain of ₦8.5 million — and a potential CGT liability of ₦850,000 at disposal, regardless of whether the naira-dollar rate has moved in their favour.

The Finance Act 2021 clarified that gains on the disposal of shares in a Nigerian company are chargeable even where the shares are unlisted. Previously, some taxpayers argued that only sales through a regulated exchange triggered the charge. FIRS issued a public notice in 2022 reiterating this position. For private equity exits, venture-backed founder disposals and off-market share transfers, the 10% liability applies and must be self-assessed.

Dividend Income and the Withholding Tax Mechanism

Dividends paid by Nigerian companies attract a 10% Withholding Tax deducted at source. For most retail shareholders, the WHT is applied by the Registrar or the Receiving Bank before the net dividend is credited to the investor's account. The WHT certificate serves as evidence of tax payment and is a credit against any income tax assessment for the year.

The key point that FIRS enforcement has consistently emphasised: WHT is not a final tax for individuals. For a Nigerian resident individual, dividend income is aggregated with other income and assessed under PITA. The WHT of 10% becomes a credit against the personal income tax (PIT) due. If the individual's effective PIT rate exceeds 10% on that slice of income, additional tax is owed. In practice, where total taxable income (salary, self-employment, investment income) pushes the taxpayer into the top PITA band of 24%, the WHT credit still leaves a balance payable.

The Finance Act 2023 also addressed the one-time dividend anomaly: dividends paid from retained earnings accumulated over multiple years were being assessed in a single year, sometimes creating disproportionate liability. FIRS now accepts spreading submissions with documentary support, though the practice is not yet codified in a formal circular.

For non-resident investors receiving dividends from Nigerian companies, the WHT of 10% is generally the final tax, subject to the terms of any Double Taxation Agreement (DTA). Nigeria has DTAs in force with the United Kingdom, France, South Africa, the Netherlands, Pakistan, Romania, Canada and China, among others. Most treaties reduce the WHT rate to 7.5% on dividends where the non-resident company holds at least 10% of the paying company's voting shares. Nigerian stockbrokers dealing with diaspora investors should verify treaty residence certificates before applying reduced rates.

“WHT on dividends is a credit, not a final discharge: Nigerian investors with incomes above ₦3.2 million must assess whether additional personal income tax is owed on their dividend receipts.”

Interest Income, Fixed Income and Treasury Bills

Interest income from bank deposits, corporate bonds and commercial paper is subject to WHT at 10% for individuals and 10% for companies. The paying institution deducts at source and remits to FIRS within 30 days, a timeline tightened by the Finance Act 2021 (previously 21 days under some interpretations, though practice was inconsistent).

Nigerian Treasury Bills (NTBs) and FGN Bonds are explicitly exempt from both income tax and CGT under Section 3 of the CGT Act and Section 19 of the Personal Income Tax Act. The CBN has used this exemption as a yield lever: as at May 2026, the 364-day NTB was clearing at auction yields above 21%, and the FGN Savings Bond (accessible from ₦5,000 per unit through DMO-designated outlets) was offering competitive rates to retail savers. For tax-sensitive investors, these instruments offer a significant advantage over corporate bonds.

How Do You Declare Investment Income to FIRS?

Self-assessment is the operative framework. Under PITA and CITA, taxpayers are required to file an annual return disclosing all income, including investment income, by 31 March of the following year (individuals) or within six months of the financial year-end (companies).

The Joint Tax Board (JTB) operates the Taxpayer Identification Number (TIN) system. As at Q1 2026, the NBS and FIRS jointly reported over 45 million active TINs, though compliance on investment income schedules remains patchy. FIRS data published in the 2025 Annual Report indicated that personal income tax collection from investment income amounted to ₦189 billion in 2024, representing less than 8% of total FIRS collections — a figure widely regarded by tax economists as understating the actual tax base.

What the Declaration Must Include

An individual investor's annual return should schedule:

  • Gross dividends received, with the name of the paying company, date of payment and WHT certificate number
  • Interest income from each institution, with WHT certificates
  • Any gains from disposal of chargeable assets in the year, computed per the CGTA formula: proceeds minus allowable expenditure
  • Income from real estate or rental property

Where a taxpayer has disposed of shares, the supporting schedule should include the original contract note from the purchase, the selling contract note, broker commissions paid on both legs and any stamp duty. FIRS has increasingly issued information requests to NGX's Central Securities Clearing System (CSCS) for investor transaction data. The CSCS, which records all equity transactions on the NGX, is legally obliged to provide this data under the FIRS Establishment Act 2007.

For Capital Gains Tax specifically, the return is separate from the income tax return. CGT returns are filed with FIRS (not the State Internal Revenue Service) and payment is due at the time of filing. Late payment attracts interest at the CBN Minimum Rediscount Rate plus 3%, currently a significant charge given that the CBN Monetary Policy Rate stood at 26.25% as at June 2026.

Cryptocurrency and Digital Assets

FIRS has not yet issued a standalone circular on the taxation of cryptocurrency gains, but the CGTA's broad definition of "chargeable assets" as any form of property encompasses digital assets. In a guidance note circulated to large taxpayers in 2023, FIRS indicated that gains from disposal of cryptocurrency should be reported under CGT at 10%.

The CBN's partial relaxation of its restrictions on virtual asset service providers (VASPs), communicated in its December 2023 circular, brought some crypto activity back into the banking system. According to CoinGecko data, Nigeria consistently ranks among the top five countries globally by peer-to-peer crypto trading volume. FIRS is aware of this volume and has, in its Strategic Revenue Growth Initiative (SRGI), listed digital asset taxation as a priority area for 2025 to 2027.

Investors who acquired Bitcoin or stablecoins and later disposed of them at a naira gain should compute the gain in naira (using naira-equivalent at acquisition and disposal dates) and self-assess CGT. Absence of a specific circular does not create a safe harbour.

Penalties for Non-Compliance

FIRS may impose a penalty of 10% of the unpaid tax per annum under Section 76 of PITA, with interest compounding at the CBN rate. For CGT, the penalty is stipulated in Section 31 of the CGTA as a fine not exceeding ₦5,000 (a figure not updated since original enactment) plus interest on unpaid tax. In practice, FIRS has pursued larger defaulters through tax audits rather than fixed fines, and the Finance Act 2023 gave FIRS expanded powers to access third-party financial records.

The practical implication: investors active on the NGX, in fixed-income markets, or holding digital assets with significant unrealised or realised gains should engage a tax adviser and maintain clean records of all acquisition costs and disposal proceeds.

Regulatory note: This article references the Capital Gains Tax Act (Cap C1 LFN 2004), the Personal Income Tax Act (Cap P8 LFN 2004), the Finance Acts of 2021 and 2023, and publicly available guidance from FIRS and the CBN. Withholding Tax rates and exemption lists are subject to change by Finance Acts; readers should verify current rates with FIRS or a qualified tax practitioner. The Cowrie is an independent editorial publication. It holds no financial services licence, does not provide tax advice and is not affiliated with FIRS, the CBN or the Securities and Exchange Commission. Nothing in this article constitutes tax or legal advice.

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