Strengthening the Self-Assessment Regime Under the Nigeria Tax Administration Act 2025
The Nigeria Tax Administration Act 2025 represents a decisive shift in Nigeriaโs tax compliance framework. At the centre of this reform is a strengthened self-assessment regime, which formally places the primary responsibility for tax computation, filing, and payment on the taxpayer. Under the new law, compliance is no longer a reactive process driven by tax authority assessments. It is a proactive legal obligation. The NTAA 2025 reinforces mandatory filing timelines, imposes stricter accuracy standards, and introduces firmer administrative consequences for default. For companies, professionals, employers, and individuals, understanding this framework is essential to managing compliance risk. Statutory Foundation of Self-Assessment The obligation to self-assess is clearly established under Section 32 NTAA 2025, which requires every taxable person to file a return of income for each year of assessment in the prescribed form. Further, Section 34 provides that a return filed by a taxpayer constitutes a self-assessment. The tax payable as declared becomes due and enforceable unless and until reviewed by the relevant tax authority. In practical terms: The tax authority retains review powers, but the legal burden of correctness rests with the taxpayer. Mandatory Filing โ Regardless of Profit Position A critical clarification under Section 32(3) NTAA 2025 is that filing is mandatory even where: Failure to file constitutes default irrespective of profitability. The reform eliminates the misconception that โno profit equals no obligation.โ Compliance begins with filing โ not with payment Statutory Filing Deadlines by Tax Category The NTAA 2025 reinforces clear timelines. Missing statutory deadlines now triggers automatic financial exposure. A. Companies Income Tax (CIT) Section 36 NTAA 2025 Example: A company with a 31 December 2025 year-end must file by 30 June 2026. This provision ensures early compliance discipline for startups. B. Personal Income Tax โ Self-Employed Persons Section 38 NTAA 2025 Self-employed individuals must file returns on or before 31 March of the following year. Thus, income earned in 2025 must be declared by 31 March 2026. C. Employees with Additional Income Section 38 NTAA 2025 Employees whose tax is deducted under PAYE are still required to file annual returns where they have additional income sources (e.g., rental income, investment income, business income). The deadline remains 31 March of the following year. D. Value Added Tax (VAT) Section 52 NTAA 2025 VAT returns must be filed on or before the 21st day of the month following the transaction month. For example: Nil returns are also required where no VATable transaction occurred. E. Withholding Tax (WHT) Section 54 NTAA 2025 Withholding tax deducted must be remitted not later than the 21st day of the month following deduction. Delayed remittance attracts penalties and statutory interest. F. Pay-As-You-Earn (PAYE) Section 55 NTAA 2025 Employers must remit PAYE deductions on or before the 10th day of the following month. Non-remittance exposes the employer to personal liability. Accuracy and Full Disclosure Obligations The strengthened regime is not limited to deadlines. Under Section 40 NTAA 2025, taxpayers must ensure that returns filed are true, complete, and correct. This includes proper income disclosure, accurate expense claims, and appropriate tax computations. Where income is understated or tax is underpaid, the tax authority may: The Act does not distinguish sharply between intentional misstatement and negligent inaccuracy โ both carry consequences. 5. Administrative Assessment and Objection Timeline Under Section 44 NTAA 2025, where a taxpayer fails to file a return, the tax authority may raise an administrative (best-judgment) assessment. The taxpayer then has 30 days to object under Section 48 NTAA 2025. Failure to object within that period renders the assessment final and enforceable. Recovery measures may then follow in accordance with the enforcement provisions of the Act. This significantly increases the risk exposure for taxpayers who ignore filing obligations. 6. Penalties and Interest for Non-Compliance The NTAA 2025 strengthens the administrative penalty framework. Under Section 71 NTAA 2025, failure to file returns attracts: Under Section 73, unpaid tax attracts interest calculated from the statutory due date until full payment, typically linked to prevailing monetary policy benchmarks. The cumulative effect of penalties and interest can materially increase tax exposure within a short period. 7. Corporate Governance and Risk Implications The strengthened self-assessment regime elevates tax compliance from a routine accounting task to a governance issue. Boards and senior management must now ensure: Inaccurate filings are no longer minor administrative errors โ they represent statutory breaches with financial implications. Conclusion The Nigeria Tax Administration Act 2025 firmly establishes self-assessment as the backbone of Nigeriaโs tax administration system. By reinforcing filing deadlines, mandating full disclosure, and strengthening penalties, the law places accountability squarely on taxpayers.
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