Arm's length purchaser meaning

In practice, an arm’s length purchaser is a buyer dealing with the seller (vendor) as an independent, unconnected party, each negotiating solely in their own commercial interests and free from control, common ownership, special relationship, collusion, undue influence or duress. The expression is descriptive rather than a standalone statutory term, but arm’s length concepts are used across corporate, tax, property and insolvency law and appear in legislation and case law (for example, transfer pricing rules: TIOPA 2010 in the UK and the Taxes Consolidation Act 1997 in Ireland; and tests addressing market value, connected persons and related party transactions). Key legal features: - Terms and price reflect open‑market conditions between a willing buyer and willing seller. - No side arrangements or concessions arising from a relationship between the parties. Typical usage and significance: - Supporting market value evidence in valuations and tax (including SDLT and CGT). - Demonstrating that dealings are on normal commercial terms. - Resisting insolvency challenges to transactions at an undervalue or preferences. Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, though statutory tests for “connected” or “associated” persons are jurisdiction‑ and context‑specific.