The Big Mistakes New Businesses Make (And How to Avoid Them)

The Big Mistakes New Businesses Make (And How to Avoid Them)

A guide for Nigerian entrepreneurs on business registration, tax compliance, and the FIRS REV360 platform

Starting a business in Nigeria is an exciting milestone. But between registering with the Corporate Affairs Commission (CAC), obtaining a Tax Identification Number (TIN), and meeting Nigeria Revenue Service (NRS) requirements, many new business owners make avoidable mistakes in their first year. These early errors — often made in good faith, simply because the owner didn't know better — can create tax liabilities, penalties, and compliance headaches years down the line.

This article walks through the three most common mistakes new businesses make when dealing with tax authorities, explains why each one matters, and outlines the correct, professional approach to getting it right from day one.

Mistake #1: Guessing the Commencement Date

What "commencement date" means

Under Nigerian tax law, a business's commencement date is the date on which it formally begins to carry on a trade, business, profession, or vocation for tax purposes. This date is not simply the day a business owner "feels" operations started, nor is it always the same as the CAC incorporation date. It is a defined tax concept with specific rules attached to it under the Companies Income Tax Act (CITA) and related Finance Act amendments.

Why guessing is a serious mistake

The commencement date determines:

• How your basis periods are calculated for the first three years of assessment
• Whether the "actual year" or "preceding year" basis applies to your early tax computations
• Your exposure under the special commencement and cessation rules, which can result in certain income being taxed more than once if the dates are wrongly stated
• The timeline for your statutory filing obligations, including your first Companies Income Tax (CIT) return

Many new business owners, when asked by a tax officer for their commencement date, respond with whatever date feels convenient or matches their CAC certificate — without understanding the tax implications of that answer. Once submitted, this date becomes part of your permanent tax record. Correcting a wrongly declared commencement date later is far more difficult, and often more costly, than getting it right from the start.

The professional standard

If you are not certain what your correct commencement date should be for tax purposes, do not provide a tax officer with any date that "sounds right." Every date declared to FIRS becomes part of your business's permanent compliance history and will affect how your business is assessed in future years. The appropriate step is to consult a qualified tax professional or chartered accountant who can review your specific business activities and determine the correct commencement date in line with current tax legislation.

Mistake #2: Filling REV360 Forms Without Understanding Them

What REV360 is

REV360 is FIRS's digital tax administration platform, introduced to modernise tax registration, filing, and payment processes in Nigeria. It replaces and consolidates several functions previously handled manually or through TaxPro Max, streamlining how taxpayers interact with the revenue authority — from registration to return filing to credit verification.

Why the platform requires care, not guesswork

REV360, like any tax filing system, only produces accurate outcomes when the information entered into it is accurate. The platform does not correct errors in judgment — it simply records what is entered. Common areas where new business owners struggle include:

• Selecting the correct tax type and obligation category for their specific business activity
• Understanding which fields relate to VAT, Withholding Tax (WHT), or Companies Income Tax
• Correctly declaring NIL returns where applicable, versus leaving fields blank
• Verifying WHT credits before they are applied against other tax liabilities

An incorrectly completed REV360 form does not simply "sit there" — it becomes part of the data FIRS uses to assess your business, calculate liabilities, and process future claims such as tax credit offsets. An error made today can surface as a discrepancy, a rejected credit claim, or a compliance query months or years later.

The professional standard

If you are unsure what information belongs in any section of the REV360 platform, do not attempt to complete the form based on assumption or advice from unqualified sources. Every entry on this platform has tax consequences. The appropriate step is to engage a professional who understands both the platform's technical requirements and the underlying tax law, so that what is filed today accurately reflects your business's true tax position.

Mistake #3: Estimating the Accounting Year End

What the accounting year end determines

Your accounting year end (also called your financial year end) is the date on which your business's annual accounts are prepared and closed. This date is central to Nigerian tax administration because it determines:

• The basis period used to calculate your taxable profits for each year of assessment
• Your statutory filing deadline for annual tax returns
• How commencement and cessation rules apply if your business is newly established or winding down
• Whether your business qualifies for certain reliefs or incentives that are tied to specific accounting periods, such as Pioneer Status considerations

Why an arbitrary answer creates future problems

Some new business owners select an accounting year end simply because it matches a convenient calendar date, without considering how that date interacts with commencement rules or filing obligations. Once declared to FIRS, this date shapes every subsequent tax computation for the business. Changing an accounting year end later is possible under Nigerian tax law, but it requires formal notification and can itself trigger additional basis period computations — meaning an uninformed decision today can create real administrative and financial consequences tomorrow.

The professional standard

If you are not certain what your accounting year end should be, do not state any date arbitrarily to a tax officer. This is a decision that should be made deliberately, with an understanding of how it affects your business's tax position over time — not a detail to be settled on the spot. A qualified accountant can help determine the year end that is most appropriate for your specific business circumstances.

Why This Principle Matters: Whatever You Declare Today, Your Business Lives With Tomorrow

There is a common thread running through all three mistakes above: every piece of information a business owner provides to a tax authority becomes a permanent part of that business's compliance record. Tax administration in Nigeria — whether through TaxPro Max, REV360, or manual FIRS processes — is built on the principle that declarations are binding until formally corrected, and corrections themselves often carry administrative burden.

A business's early tax decisions are not isolated events. They compound. A wrongly declared commencement date affects three years of basis period computations. An inaccurately completed REV360 form affects credit verification and future filings. An arbitrary accounting year end affects the timing and structure of every annual return that follows. This is why tax administration should not be approached as a form-filling exercise, but as a professional discipline requiring proper guidance.

Why Businesses Should Engage a Professional Consulting Firm for Tax Filing

Nigerian tax law — spanning the Companies Income Tax Act (CITA), the Value Added Tax Act, the Finance Acts (which are amended regularly), and the FIRS Establishment Act — is technical and continually evolving. There are several reasons why business owners are better served by working with a chartered accountancy or professional tax consulting firm rather than navigating these obligations independently:

1. Accuracy in classification. Professionals correctly determine which tax types, obligations, and reliefs apply to a specific business structure and industry, reducing the risk of misclassification.
2. Correct basis period computation. Determining commencement dates, accounting year ends, and basis periods requires applying specific statutory rules — not simply picking convenient dates.
3. Proper use of digital platforms. REV360 and TaxPro Max are technical systems. Professionals who work within these platforms regularly understand their structure, common pitfalls, and how entries interact with each other.
4. Ongoing regulatory awareness. Tax legislation changes through Finance Acts and FIRS circulars. A professional firm stays current with these changes so that a business's filings remain compliant as the law evolves.
5. Reduced long-term risk. Errors in early filings can surface later as queries, penalties, interest charges, or rejected credit claims. Professional oversight reduces this risk at the source.
6. Coordinated compliance across regulators. Depending on the nature and structure of a business, tax compliance often intersects with other regulatory bodies — including the CAC, PENCOM, NSITF, ITF, LIRS, and sector-specific regulators such as NAFDAC or NUPRC. A firm with cross-regulatory experience can help a business understand how these obligations connect.

Why Every Business Should Comply With Tax Regulation

Compliance with Nigerian tax regulation is not simply a legal formality — it is foundational to how a business operates and grows:

• Legal standing. Registered businesses are required by law to meet their tax obligations under CITA, the VAT Act, and related legislation. Non-compliance carries statutory penalties and interest.
• Access to opportunities. Many contracts, tenders, and business relationships — particularly with government agencies and larger corporate entities — require evidence of tax compliance, such as a Tax Clearance Certificate.
• Business continuity. A business with an unresolved compliance history may face difficulty during due diligence processes, such as when seeking financing, partnerships, or eventual sale of the business.
• National development. Tax revenue funds public infrastructure and services. Compliance is part of a business's broader role within the economy.

Tips on Tax Credits and Compliance Opportunities in Nigeria

Nigerian tax law provides several mechanisms that, when properly understood and applied, can benefit compliant businesses:

• Withholding Tax (WHT) credit recovery. WHT deducted at source on a business's income can, in appropriate circumstances, be offset against other tax liabilities. This requires proper documentation and verification through the FIRS platform, and errors in this process can delay or forfeit legitimate credits.
• NIL VAT returns. Businesses with no VATable transactions in a given period are still required to file NIL returns. Filing correctly — rather than leaving obligations unaddressed — helps maintain a clean compliance record.
• Capital allowances. Businesses that invest in qualifying capital assets may claim capital allowances against taxable profits, subject to the rules and rates prescribed under CITA.
• Pioneer Status incentive. Businesses operating in designated pioneer industries may, subject to qualifying conditions and formal application, benefit from a tax holiday period. Eligibility and application require careful review against current criteria.
• Timely filing. Meeting statutory deadlines — for CIT, VAT, and WHT returns — helps businesses avoid penalties and interest, and supports a stronger compliance history over time.

Each of these areas involves specific conditions, documentation requirements, and legislative references that vary by business type and circumstance. This is precisely the kind of detail that benefits from professional review rather than general assumption.

The Broader Legislative Framework

Nigerian tax administration for businesses draws on several key pieces of legislation and regulatory guidance:

• Companies Income Tax Act (CITA) — governs the taxation of company profits, including commencement, cessation, and basis period rules.
• Value Added Tax Act — governs VAT registration, filing, and NIL return obligations.
• Finance Acts (amended periodically) — introduce ongoing changes to tax rates, thresholds, and administrative procedures.
• FIRS Establishment Act — governs the powers and administrative processes of the Federal Inland Revenue Service, including platforms such as REV360.

Understanding how these instruments interact is central to sound tax compliance, and is a core part of the technical work performed by chartered accountants and tax professionals.

Conclusion

New businesses in Nigeria face a genuine learning curve when it comes to tax compliance — and that is entirely normal. The mistake is not in being unfamiliar with tax rules; the mistake is in guessing when clarity is available through proper professional guidance. A commencement date, a REV360 entry, or an accounting year end may seem like a small administrative detail at the point of filing — but each one shapes how a business is assessed for years afterward.

The safest and most professional approach is straightforward: where there is uncertainty, ask a professional before submitting information to a tax officer or a digital platform. What is filed today becomes the foundation your business stands on tomorrow.

US & CO. (Chartered Accountant) is a Lagos-based chartered accountancy and professional services firm registered with the Institute of Chartered Accountants of Nigeria (ICAN), providing accounting, tax management, audit, corporate affairs, and business advisory services.

For further assistance with tax registration, filing, or compliance matters, you may contact a professional tax consulting firm in Lagos, Nigeria:

📞 WhatsApp: 08056219998 📧 Email: info@usc.com.ng 🌐 Website: https://www.usc.com.ng

Frequently Asked Questions

1. What is a commencement date for tax purposes, and why does it matter? It is the date a business is deemed to have started trading for tax purposes. It determines how your early years of tax assessment are calculated and should be confirmed with a qualified professional rather than estimated.

2. Is the commencement date the same as my CAC registration date? Not necessarily. The tax commencement date relates to when business activity actually began, which can differ from the date of incorporation. A professional can help clarify this distinction for your specific circumstances.

3. What is REV360? REV360 is FIRS's digital platform for tax registration, filing, and related administrative processes, designed to streamline taxpayer interactions with the revenue authority.

4. Can I complete my REV360 filing myself? Business owners can access the platform directly, but accuracy depends on correctly understanding tax classifications, obligations, and credit verification processes. Where there is uncertainty, professional guidance helps avoid errors that could affect future filings.

5. What happens if I state the wrong accounting year end? It can affect how your taxable profits are computed and your filing deadlines going forward. Changing it later is possible but involves formal notification and additional computation, so it is best determined correctly from the outset.

6. Why should I use a professional firm instead of filing on my own? Nigerian tax law involves technical rules around classification, basis periods, and digital platform requirements. A professional firm helps ensure accuracy and reduces the risk of errors surfacing as compliance issues later.

7. What is WHT credit recovery? It refers to the process of offsetting Withholding Tax already deducted from your income against other tax liabilities. This requires proper documentation and verification, which a tax professional can assist with.

8. Do I still need to file if my business had no taxable transactions in a period? Yes. Businesses are generally required to file NIL returns even where there were no VATable transactions or taxable income in a given period, to maintain a compliant filing history.

9. How can I get professional guidance on any of these issues? You may contact a professional tax consulting firm in Lagos, Nigeria via WhatsApp (08056219998), email (info@usc.com.ng), or through the website (https://www.usc.com.ng).