How to Handle Tax Disputes with FIRS: A Complete Guide for Nigerian Businesses

Nobody wants a letter from FIRS.

But when it arrives, your heart sinks. A tax assessment you did not expect. Penalties that seem unfair. Demands for documentation you already submitted.

You have options. You have rights. And you have a process to follow.

Let me walk you through exactly how to handle tax disputes with FIRS. From the first letter to final resolution.

What is a tax dispute?

According to the Organisation for Economic Co-operation and Development (OECD), a tax dispute is “a disagreement between a taxpayer and a tax authority regarding the interpretation or application of tax law, which may relate to the amount of tax due, the taxpayer’s obligations, or the administration of tax provisions.”

In plain language, you and FIRS disagree about your taxes. How much do you owe? Whether you followed the rules. What documentation do you need to provide?

Common scenarios that lead to FIRS disputes

Assessment disagreements happen when FIRS calculates your tax differently from what you did. They say you owe more. You say they are wrong.

Transfer pricing issues arise from transactions between related companies. FIRS questions whether the prices were fair.

VAT complications occur when FIRS disagrees with how you applied Value Added Tax. On specific transactions. On timing. On exemptions.

Withholding tax conflicts involve tax deductions at source. Who should deduct? How much. When to remit.

Tax audit findings from FIRS investigations may contain conclusions you dispute. The auditor saw something differently from you.

Penalty impositions challenge fines for alleged non-compliance. Late filing. Underpayment. Missing documentation.

Interpretation differences happen when you and FIRS read the same tax law differently. It happens more often than you think.

Recent updates in Nigerian tax dispute resolution

FIRS launched an online portal in late 2024 for submitting tax objections electronically. This streamlines the dispute initiation process significantly.

The Tax Appeal Tribunal now aims to resolve cases within 90 days of filing. This is a major improvement from previous indefinite periods.

Nigeria has strengthened its Mutual Agreement Procedure framework under tax treaties for cross-border dispute resolution. International disputes now have clearer pathways.

FIRS now actively encourages mediation and settlement discussions before formal litigation. Alternative dispute resolution is becoming the norm.

The Presidential Executive Order on Ease of Doing Business continues to emphasise fair tax administration and taxpayer rights protection.

Steps to resolve tax disputes with FIRS

Let me walk you through the systematic approach that works.

Step one: Internal review and documentation.

Before you engage with FIRS, do your homework.

Review all tax assessments, notices, and communications from FIRS carefully. Gather supporting documentation, including financial statements, receipts, and previous tax returns. Identify specific points of disagreement with clear evidence.

Consult your internal accounting team or tax advisors. Calculate the financial impact of the disputed assessment. Document your timeline of events and communications with FIRS. Prepare a detailed position paper outlining your arguments.

Step two: Informal resolution through direct engagement.

Many tax conflicts can be resolved through simple dialogue.

Request a meeting with the relevant FIRS tax office or assessment officer. Present your documentation and concerns professionally. Seek clarification on the basis for FIRS’s position.

Explore whether computational errors or misunderstandings exist. Propose reasonable settlement options if you acknowledge partial liability. Document all discussions and agreements in writing. Request official confirmation of any resolutions reached.

Step three: Formal objection process.

If informal resolution fails, you must act quickly.

Submit a written objection to FIRS within 30 days of receiving the assessment notice. This timeline is critical. Missing it can cost you your right to object.

Include your tax identification number, assessment reference, and disputed amount. Clearly state the grounds for objection with supporting legal and factual arguments. Attach all relevant supporting documents and evidence.

Request suspension of collection pending resolution, where applicable. Use the new FIRS digital platform for electronic submission when available. Retain proof of submission with date stamps. Follow up to confirm receipt and assignment of your objection.

FIRS is required to respond to objections within a reasonable timeframe, typically 30 to 60 days.

Step four: Appeal to the Tax Appeal Tribunal.

When FIRS’s objection decision remains unsatisfactory, escalate to the Tax Appeal Tribunal.

File your appeal within 30 days of receiving FIRS’s objection decision. Or within 6 months if no response is received. Both timelines matter.

Engage qualified tax lawyers or consultants experienced in TAT proceedings. Prepare comprehensive written submissions with legal precedents. Compile all evidence and witness statements if required.

Attend tribunal hearings and present your case professionally. Benefit from the TAT’s specialised tax expertise and faster resolution timelines. Consider settlement discussions even during tribunal proceedings. Be prepared for the tribunal’s binding decision.

Step five: Alternative dispute resolution mechanisms.

Nigeria increasingly encourages ADR for tax disputes.

Request FIRS facilitated mediation for mutually acceptable solutions. Propose compromise agreements that balance both parties’ interests. Negotiate instalment arrangements for undisputed portions of the liability.

For transfer pricing matters, seek Advance Pricing Agreements on methodologies prospectively. Use Mutual Agreement Procedures for international tax disputes under treaties. Watch for tax amnesty programs offering periodic penalty waivers.

Step six: Judicial review and court appeals.

As a last resort, pursue judicial intervention.

Appeal TAT decisions to the Federal High Court within the prescribed timeline. Further appeals may proceed to the Court of Appeal and ultimately the Supreme Court. Each level takes time and money.

Engage experienced tax litigation counsel for court proceedings. Prepare for potentially lengthy and costly legal processes. Consider the precedent value and broader implications of your case. Evaluate settlement opportunities at any stage of litigation.

Best practices for preventing and managing tax disputes

Do not wait for a dispute to start preparing. Build good habits now.

Maintain impeccable records.

Implement robust accounting systems that ensure accuracy and completeness. Retain all tax-related documentation for the statutory period of a minimum of 6 years. Organise records systematically for easy retrieval during audits.

Keep contemporaneous documentation for significant transactions. Maintain detailed records of all FIRS interactions and submissions.

Ensure timely and accurate compliance.

File all tax returns before statutory deadlines consistently. Make tax payments promptly to avoid penalties and interest charges. Respond to FIRS inquiries and information requests quickly.

Conduct periodic internal tax health checks and compliance reviews. Update your knowledge of changing tax regulations and FIRS guidelines.

Seek professional tax advisory services.

Engage qualified tax consultants for complex transactions and planning. Obtain professional opinions on uncertain tax positions before filing. Conduct regular tax risk assessments of your business operations.

Invest in training for your finance and accounting teams. Consider obtaining tax clearance certificates to demonstrate good standing.

Build constructive relationships with tax authorities.

Maintain open, honest communication channels with your FIRS tax office. Demonstrate a cooperative attitude during audits and inquiries. Voluntarily disclose errors or omissions discovered in previous filings.

Participate in FIRS stakeholder engagement programs and consultations. Establish yourself as a compliant, transparent taxpayer.

When to engage professional tax dispute resolution services

Certain circumstances clearly indicate you need specialised help.

Complex legal issues involving intricate tax law interpretations or novel legal questions demand expert analysis. Significant financial exposure where substantial tax liabilities or business impact is at stake requires professional representation.

Transfer pricing disputes with international transactions need specialised expertise and documentation. Criminal tax investigations involving allegations of tax evasion or fraud require legal counsel immediately.

Multiple tax jurisdiction disputes spanning different Nigerian states or international territories need a coordinated strategy. Tribunal or court proceedings require representation by qualified counsel.

Strategic business implications that could set precedents or affect future tax positions need careful handling. Resource constraints when your internal team lacks time, expertise, or capacity to manage disputes effectively also call for outside help.

Professional tax dispute resolution firms offer expert analysis of your tax position and dispute merits. Strategic advice on the most effective resolution pathway. Preparation of comprehensive objections and appeals documentation. Skilled negotiation with FIRS on your behalf. Representation before Tax Appeal Tribunals and courts. Alternative dispute resolution facilitation and settlement negotiation. Ongoing compliance support to prevent future disputes.

Key takeaways for Nigerian businesses

Act quickly. Observe all statutory timelines for objections and appeals. Typically 30 days. Missing them costs you rights.

Document thoroughly. Maintain comprehensive records and evidence to support your position. Paper wins disputes.

Explore all options. Consider informal resolution, formal objections, ADR, and litigation as appropriate for your situation.

Stay compliant. Continue meeting tax obligations even while disputing specific assessments. Do not give FIRS another reason to come after you.

Seek expertise. Engage professional tax advisors for complex or high-stakes disputes. The cost is worth the protection.

Remain professional. Maintain respectful, constructive engagement with FIRS throughout the process. Aggression never helps.

Know your rights. Understand taxpayer protections under Nigerian tax legislation. You have more rights than you think.

Consider the bigger picture. Evaluate settlement options against litigation costs and business disruption. Sometimes settling is the smart business move.

Where to start tomorrow

Do not panic if you receive a disputed assessment letter. You have options.

Read the letter carefully. Understand exactly what FIRS is claiming and why.

Gather your documentation. Pull every record related to the disputed period.

Check your timeline. Note the objection deadline. Usually 30 days from receipt.

Talk to your accountant or tax advisor. Get professional input before responding.

Respond professionally. Even if you are angry, keep your communication factual and respectful.

Consider the full cost. Legal fees, management time, business disruption. Sometimes, settlement is cheaper than fighting.

Final word

Tax disputes with FIRS are stressful. But they are not the end of the world.

You have rights. You have a process. You have options for resolution.

Act quickly. Document everything. Seek professional help when needed. Stay compliant even while disputing.

Most disputes can be resolved without going to court. Informal discussions work. Mediation works. Settlement negotiations work.

But you must know your rights. You must follow the timelines. And you must present your case professionally.

Do not face FIRS alone. Get expert help. Protect your business.

CALL TO ACTION

Take Action Today: Expert Tax Dispute Resolution Support

Don’t let tax disputes disrupt your business operations or jeopardise your financial stability. Whether you are facing a current FIRS assessment challenge or want to proactively strengthen your tax compliance framework, Stonehill Research is here to help.

Our Tax Dispute Resolution Services

Comprehensive tax dispute assessment and strategy development. Expert representation before FIRS, Tax Appeal Tribunals, and courts. Alternative dispute resolution and settlement negotiation. Ongoing tax compliance advisory to prevent future conflicts. Transfer pricing documentation and dispute resolution. Tax health checks and risk assessments for Nigerian businesses.

Why Choose Stonehill Research?

Deep FIRS Expertise. We understand how FIRS operates. We know their processes, their timelines, and their pressure points. This knowledge gets results.

Proven Track Record. We have successfully resolved hundreds of tax disputes for Nigerian businesses across every major industry. Our clients save money and avoid penalties.

Strategic Approach. We do not just react to assessments. We build strategies that protect your business now and prevent future disputes.

Professional Representation. When you need to appear before FIRS, the Tax Appeal Tribunal, or the courts, our experienced tax professionals represent you effectively.

Cost-effective. Our fees are a fraction of the penalties and interest you would pay if you lost a dispute. Good tax dispute representation pays for itself.

Contact Stonehill Research Today

Don’t navigate complex tax disputes alone. Let our expertise work for you.

📧 Email: info@stonehillresearch.com
📞 Phone: +234 802 320 0801
📍 Office: 5, Ishola Bello Close, Off Iyalla Street, Alausa, Ikeja, Lagos, Nigeria

Schedule a Confidential Consultation. Reach out now to protect your business interests and achieve favorable resolution of your FIRS tax matters.

Stonehill Research – Your Trusted Partner in Tax Dispute Resolution

REFERENCES

Organisation for Economic Co-operation and Development (OECD). Tax Dispute Resolution. https://www.oecd.org/tax/dispute/

Federal Inland Revenue Service (FIRS) Official Website. https://www.firs.gov.ng

Tax Appeal Tribunal. https://www.tatnigeria.org

Companies Income Tax Act (CITA), Cap C21, LFN 2004 (as amended)

Federal High Court Tax Practice Directions

Nigerian Tax Treaties and Agreements