THE CFO HQ Research Insight
Uncertain Tax Positions: What CFOs, Finance Directors and Boards Need to Know
A practical guide to identifying, assessing and mitigating uncertain tax positions across corporation tax, VAT, employment taxes, transfer pricing, international tax and financial reporting.
By Kirsty Jones | Research & Development Manager | The CFO HQ
Executive Summary
Tax risk has moved firmly into the boardroom. Revenue authorities are using better data, stronger disclosure regimes and increasingly coordinated international enforcement to challenge positions that may previously have gone untested.
For CFOs and Finance Directors, uncertain tax positions are not only tax technical matters. They affect financial reporting, audit judgement, governance, cash flow, investor confidence and reputation.
Download the Full CFO HQ White Paper
Access the full client-facing guide, including risk matrices, board-level checklists, financial reporting considerations, transfer pricing examples and tax governance recommendations.
✓ Tax risk assessment framework
✓ Transfer pricing warning signs
✓ Financial reporting and audit considerations
✓ Practical CFO do’s and don’ts
What is an Uncertain Tax Position?
An uncertain tax position exists where there is uncertainty over whether a tax authority would agree with the tax treatment adopted by a business. The position may be technically supportable, but the outcome remains uncertain if challenged.
CFO perspective: the question is not only whether the tax treatment is defensible, but whether the organisation can evidence the judgement, quantify the exposure and report it appropriately.
Common Areas Where UTPs Arise
| Tax Area | Typical Issue | Why It Matters |
|---|---|---|
| Corporation Tax | Deductibility of material expenditure | Can lead to additional tax, interest and penalties. |
| R&D Claims | Eligibility, subcontracting and evidence quality | High scrutiny area for tax authorities. |
| VAT | Treatment of supplies, exemptions and cross-border sales | Errors can accumulate quickly across transactions. |
| Employment Taxes | IR35, contractor status and benefits | Creates payroll, NIC, governance and reputational risk. |
| Transfer Pricing | Intercompany pricing and profit allocation | Often high value and multi-jurisdictional. |
| International Tax | Permanent establishment and withholding tax | Can trigger unexpected overseas filings and liabilities. |
Warning Signs CFOs Should Watch For
1. Historic Practice
“We have always done it this way” should trigger a fresh review, especially where legislation, guidance or business facts have changed.
2. Weak Evidence
Many disputes are lost because documentation is incomplete, inconsistent or created too late.
3. Cross-Border Growth
International expansion can create VAT, payroll, permanent establishment and transfer pricing exposures.
4. Related Party Transactions
Management charges, IP fees, loans and shared services require arm’s-length support.
5. Large Manual Adjustments
Material year-end adjustments may indicate process weakness, judgemental tax treatment or unresolved exposure.
6. “Too Good” Outcomes
A tax benefit that appears unusually favourable should be independently challenged before reliance.
What Type and Size of Companies Are Most at Risk?
Large multinationals are naturally exposed because of cross-border complexity, but mid-market and fast-growth businesses can be equally vulnerable where tax governance has not kept pace with commercial growth.
| Company Profile | Risk Drivers | CFO Focus |
|---|---|---|
| Multinational Groups | Transfer pricing, IP, supply chains | Annual TP review and documentation. |
| Private Equity-Backed Businesses | Debt, restructuring, acquisition accounting | Tax diligence, interest restrictions and exit readiness. |
| Fast-Growth SMEs | Immature controls, overseas sales, limited documentation | Tax governance maturity assessment. |
| Family-Owned Groups | Related-party transactions, property structures | Document commercial rationale and approvals. |
Illustrative Tax Risk Matrix
| Risk | Likelihood | Impact | Priority | Mitigation |
|---|---|---|---|---|
| Transfer Pricing | High | Very High | Critical | Annual benchmarking and governance review. |
| VAT Errors | Medium | High | High | Periodic VAT health checks and controls testing. |
| R&D Claims | Medium | High | High | Technical evidence, project files and adviser review. |
| Employment Taxes | Medium | High | High | IR35 and contractor status review. |
Do
✓ Maintain robust contemporaneous documentation.
✓ Review material tax positions annually.
✓ Escalate significant judgements to the Board or Audit Committee.
✓ Obtain independent advice where judgement is material.
✓ Align tax governance with financial reporting and audit processes.
Don’t
✗ Rely on historic treatment without review.
✗ Treat transfer pricing as a file-only compliance exercise.
✗ Ignore small recurring errors that can compound over time.
✗ Delay responding to tax authority enquiries.
✗ Wait until year-end audit to identify exposures.
What Time Periods Can Come Into Scope?
Lookback periods depend on jurisdiction, behaviour, tax type and whether enquiries are already open. CFOs should not assume that older periods are automatically closed without checking the specific facts.
| Scenario | Typical UK Exposure Period | CFO Consideration |
|---|---|---|
| Normal position | Often up to 4 years | Check whether returns are final and enquiries are closed. |
| Careless behaviour | Often up to 6 years | Documentation quality and process controls matter. |
| Deliberate behaviour | Can extend up to 20 years | Governance, disclosure and professional advice are critical. |
How CFOs Can Mitigate UTP Risk
1. Identify
Map material tax positions, judgemental treatments and unresolved matters.
2. Assess
Evaluate technical strength, evidence, quantum and reporting impact.
3. Govern
Define ownership, approvals and escalation thresholds.
4. Monitor
Review annually and update for changes in law, facts and guidance.
Access the Full White Paper
Complete the short form below to access the full CFO HQ white paper on uncertain tax positions.
White Paper Download Form
The CFO HQ | 2026.
About The CFO HQ
The CFO HQ supports Boards, CFOs and finance leaders with CFO advisory, finance transformation, deals advisory, managed finance services and specialist finance talent solutions.
Corporate Disclaimer
This publication is for general information only and does not constitute tax, legal, accounting or professional advice. Readers should seek specific professional advice before acting on any matter discussed. Tax legislation, regulations and interpretations may change and vary by jurisdiction.