Tax Dispute Quantum Expert Witness

Tax disputes before the First-tier Tribunal (Tax Chamber) frequently turn on valuation of shares, business assets, or the quantum of income, gains, or allowances. A quantum expert provides independent analysis challenging HMRC's assessment - covering unquoted share valuations for capital gains tax, inheritance tax business property relief, employment-related securities, and penalty calculations based on the correct tax figure.

Expert evidence must satisfy the civil standard of proof on the balance of probabilities, demonstrating that the expert's methodology is more probably correct than HMRC's position. Reports address valuation date, minority and marketability discounts where applicable, maintainable earnings bases, and comparable transactions. Experts may also quantify losses or allowances flowing from disputed transactions where the quantum of tax depends on underlying commercial figures.

Coordination with legal teams on disclosure, witness statements, and hot-tubbing in complex cases ensures the tribunal receives clear, objective analysis. While valuation methodology overlaps with dedicated business valuation practice, the focus in tax tribunal proceedings is on the quantum figure driving the assessment and penalties, presented in a form the Tribunal can adopt or reject with reasons.

Frequently Asked Questions