The Nigeria Tax Administration Act 2025 represents a decisive shift in Nigeria’s 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 taxpayer computes their liability.
- The taxpayer files the return.
- The declared amount becomes the official tax position.
The tax authority retains review powers, but the legal burden of correctness rests with the taxpayer.
Mandatory Filing — Regardless of Profit Position
A critical clarification under Section 32(3) NTAA 2025 is that filing is mandatory even where:
- No tax is payable,
- The company recorded a loss,
- Business activities were minimal.
Failure to file constitutes default irrespective of profitability. The reform eliminates the misconception that “no profit equals no obligation.”
Compliance begins with filing — 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
- Existing Companies:
Must file annual returns within six (6) months after the end of the accounting year.
Example: A company with a 31 December 2025 year-end must file by 30 June 2026.
- Newly Incorporated Companies:
Must file their first return within:- 18 months from incorporation, or
- 6 months after the end of the first accounting period,
whichever occurs earlier.
This provision ensures early compliance discipline for startups.
B. Personal Income Tax – 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:
- January VAT → Due 21 February
- February VAT → Due 21 March
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:
- Issue additional assessments,
- Impose administrative penalties,
- Charge interest from the original due date.
The Act does not distinguish sharply between intentional misstatement and negligent inaccuracy — 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:
- ₦100,000 for the first month of default (corporate taxpayers),
- ₦50,000 for each subsequent month of continuing default.
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:
- Robust internal compliance calendars,
- Monthly financial reconciliations,
- Proper documentation of transactions,
- Early tax computation reviews,
- Professional oversight where necessary.
Inaccurate filings are no longer minor administrative errors — they represent statutory breaches with financial implications.
Conclusion
The Nigeria Tax Administration Act 2025 firmly establishes self-assessment as the backbone of Nigeria’s tax administration system. By reinforcing filing deadlines, mandating full disclosure, and strengthening penalties, the law places accountability squarely on taxpayers.
