Before You Automate Tax, Make Sure the Data Can Be Trusted.
Vi-M helps organisations assess the quality, structure, ownership and control of the transaction data that supports tax compliance, e-Invoicing, reporting, reconciliation and tax technology.
Can You Answer These Confidently?
Many Tax Problems Begin Before the Tax Return Is Prepared
A return, e-Invoice or regulatory report is only the final output of a much longer data chain. Weaknesses may originate in customer setup, supplier records, product coding, invoice creation, tax configuration, manual journals, adjustments or interfaces long before the tax team sees the information.
Source Data
Review whether the underlying business and transaction records are complete, accurate and consistently maintained.
Tax Logic
Assess whether tax classifications, rates, treatments and system rules reflect the intended tax position.
Control & Reconciliation
Test whether exceptions, changes and reported outputs can be identified, reviewed, reconciled and evidenced.
The Tax Data Chain From Master Records to Reporting
The review can be scoped around a specific problem — such as e-Invoicing readiness — or used more broadly to assess the integrity of tax-relevant data and controls across the finance environment.
Customer & Supplier Master Data
Tax identifiers, addresses, classifications, entity information and other fields needed for compliant transactions.
Product & Service Data
Descriptions, codes, units, categories and attributes that may influence tax treatment or reporting.
Transaction Tax Logic
VAT, withholding, exemptions, adjustments and other tax rules applied at transaction level where relevant.
Invoice & Adjustment Data
Invoices, credit notes, debit notes, reversals, discounts, charges and transaction relationships.
Interfaces & Transformations
How data moves between operational, ERP, billing, tax and reporting systems and where mappings may alter it.
Reporting & Reconciliation
How tax outputs reconcile to ledgers, invoices, source systems and submitted or transmitted information.
Good Data Needs Good Ownership
Data quality is not only a systems issue. It depends on who can create or change records, who reviews exceptions, how tax logic is approved, how manual overrides are controlled and how unresolved items are escalated.
Control Areas We Consider
- Data ownership and accountability
- Creation and change access
- Tax-rule governance
- Approval of overrides and adjustments
- Exception reporting and follow-up
- Periodic reconciliation
- Audit trail and supporting evidence
Signals That a Tax Data Review May Be Needed
Repeated Manual Corrections
Tax teams repeatedly fix the same data or classification issues outside the source system.
Large Reconciliation Gaps
Returns or reports require significant unexplained reconciling items to match accounting records.
Inconsistent Tax Treatment
Similar transactions receive different tax outcomes depending on user, location or system pathway.
Weak Traceability
It is difficult to explain who changed a record, why an override occurred or how a reported figure was produced.
Master-Data Gaps
Important tax identifiers, addresses, item details or classifications are missing or inconsistently maintained.
Frequent Interface Errors
Information changes, disappears or fails validation as it moves between systems.
Spreadsheet Dependence
Critical tax logic and reconciliations depend on uncontrolled or heavily manual spreadsheet processes.
Automation Is Planned
A new e-Invoicing or tax-technology project will depend on data that has not yet been tested for reliability.
From Data Discovery to Practical Remediation
The review is designed to identify the causes of tax-data weakness and convert findings into a realistic improvement plan.
Identify systems, owners, data sources, interfaces, tax processes and reporting outputs.
Review representative master data, transaction fields, tax logic, adjustments and control evidence.
Trace selected transactions through source, accounting, tax and reporting records to identify breaks.
Evaluate data-quality, control, ownership, reconciliation and automation-readiness gaps.
Prioritise corrective actions across data, systems, process, tax logic and governance.
Typical Review Outputs
- Tax data-flow map
- Master-data gap assessment
- Tax-rule and mapping observations
- Reconciliation and exception findings
- Control and ownership gaps
- Automation-readiness observations
- Prioritised remediation roadmap
The Review Should Tell You What to Fix, Where and Why
The purpose is not merely to produce a list of data-quality issues. Management should be able to see which weaknesses create compliance risk, which are system problems, which are process or governance problems and what should be corrected before further automation.
Fiscal e-Invoicing Makes Transaction Data More Visible
When invoice information is structured, validated and transmitted through a fiscal e-Invoicing process, gaps in customer data, tax treatment, invoice relationships, totals or transaction status can become implementation issues rather than quiet back-office corrections.
Assess e-Invoicing Readiness
Review the broader systems, process, people and implementation environment around the data.
e-Invoicing Readiness Assessment →Integrate ERP & Accounting
Connect reliable source-system data into the structured e-Invoicing workflow.
ERP & Accounting Integration →Build the Wider RegTech Layer
See how data, integration, validation, security and reporting fit into the wider digital compliance architecture.
E-Invoicing & RegTech Infrastructure →A Strong Data Foundation Makes Automation More Valuable
Tax technology can reduce manual work and improve visibility, but it should be built on data and controls that management can rely on. A focused data review can therefore form the foundation for a broader tax-automation roadmap.
Fix the underlying data, tax logic and control weaknesses first — then use automation to make the stronger process faster, more consistent and more scalable. Explore Tax Technology & Automation →
Connect Data Quality to the Wider Compliance Agenda
Nigeria Tax Reform & Business Readiness
Assess how evolving tax requirements affect finance, operations, systems, data and governance.
Explore Business Readiness →Tax Technology & Automation
Move reliable tax data into more controlled, connected and scalable compliance workflows.
Explore Tax Technology & Automation →System Integrator & APP Services
Translate reliable data and defined transaction logic into connected e-Invoicing implementation.
Explore SI & APP Services →Make Sure Your Tax Data Is Ready for the Systems You Want to Build.
A focused Tax Data & Controls Review can help identify the weaknesses that would otherwise follow your business into e-Invoicing, tax automation and digital regulatory reporting.