A practical overview of how Nigerian retail investors can understand their self-assessment obligations for investment income — covering dividends, share sale proceeds, and how to access the FIRS e-service portal.
This article is for general educational purposes only. It does not constitute tax advice. Tax filing thresholds, deadlines, and obligations are set by legislation and may change. Always consult a qualified Nigerian tax adviser and refer to FIRS (firs.gov.ng) for current and accurate guidance before filing.
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In Nigeria, the obligation to file an annual self-assessment tax return is primarily governed by the Personal Income Tax Act (PITA). PAYE employees have income tax deducted at source by their employer, and may have a simplified filing obligation through their employer's remittance to the State Internal Revenue Service (SIRS). However, individuals with income from multiple sources — including investment income alongside employment income — or who are self-employed or operate a business may have a formal self-assessment obligation with FIRS or the relevant SIRS. The exact filing requirement depends on your income structure, residency, and applicable legislation. Consult a qualified Nigerian tax adviser to confirm whether you need to file a self-assessment return.
For most Nigerian resident individual investors, the main investment income types relevant to stock market investing are: (1) Dividend income — subject to WHT deducted at source. For most individuals, WHT on dividends is a final tax and no further income tax return is required specifically for the dividend amount. (2) Capital gains from share sales — historically exempt from CGT for NGX-listed securities, subject to the ongoing validity of the exemption. (3) Interest income from corporate bonds or fixed income instruments — taxed differently from equity dividends. The extent to which these income types appear on your annual return depends on the structure of your total income and whether FIRS requires them to be declared. If you have material investment income alongside other income sources, consult a tax adviser about whether a self-assessment filing is required.
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FIRS operates a digital self-service portal for tax filings and payments at firs.gov.ng. The e-Tax portal allows: registration for a Tax Identification Number (TIN) if you do not already have one; filing of self-assessment returns; viewing of your tax ledger and payment history; and payment of outstanding tax liabilities. To access the portal, you need a valid TIN. Your TIN can be obtained online via the FIRS TIN registration service or at any FIRS office. Note: FIRS periodically updates its portal and procedures — check firs.gov.ng directly for the most current process.
Regardless of whether a formal self-assessment return is required, keeping accurate records of your investment income is good practice and may be required if your tax position is ever reviewed. Records to maintain include: dividend advice notes from company registrars showing gross dividend declared and WHT deducted; broker contract notes for share purchases and sales showing dates, prices, and fees; annual account statements from your investment platform; and any correspondence from FIRS or your employer's tax team regarding WHT credits. Keep records for at least 6 years to cover the standard limitation period.
A Tax Identification Number (TIN) is a unique number issued by FIRS to identify taxpayers. While a TIN is not directly required to open an investment account or to receive dividends (which have WHT deducted at source), it may be required for certain financial services and is needed to file a tax return. Register for a TIN via firs.gov.ng if you do not already have one.
For most Nigerian resident individuals, WHT on dividends is treated as a final tax — meaning the net dividend is not further taxable as income and does not typically need to be added to other income in a self-assessment return. However, tax position depends on your specific circumstances. A qualified tax adviser can confirm whether your dividend income needs to be declared.
FIRS may require evidence of income received, WHT deducted, and any relevant tax credits claimed. This typically means retaining dividend advice notices, WHT certificates (where available from registrars), and broker statements. FIRS can request records going back several years — maintain organised investment records from the start.
Your employer only handles PAYE on your employment income. Investment income received directly into your personal bank account is not automatically reported to your employer. However, if you are subject to a self-assessment obligation, you are responsible for declaring all income to FIRS — including investment income — regardless of whether your employer is aware of it.
Failure to file a required self-assessment return may result in penalties and interest charges under the FITA or PITA. FIRS has been increasing enforcement activity on self-assessment compliance. If you are unsure whether you have a filing obligation, seek advice from a qualified Nigerian tax adviser proactively — it is significantly less costly than penalties for late filing.
Important disclaimer
This article is for general information and educational purposes only. It does not constitute tax advice, financial advice, or legal advice. Tax filing obligations, thresholds, and procedures are set by legislation and may change. This article is not a substitute for professional tax advice. Always consult a qualified Nigerian tax adviser and refer to FIRS (firs.gov.ng) for current guidance. Shares Saver does not provide tax or financial advice.
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