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Keziah Mastin

Keziah is an Associate in RPC's Tax Disputes, Financial Crime and Regulatory team. She is an experienced litigator and has acted for a broad range of clients in disputes involving both direct and indirect taxes.

Keziah advises corporate and individual clients on a broad spectrum of contentious tax issues including both direct and indirect tax matters. She has advised HNW individuals, large regulated and listed companies and SMEs.  She has experience handling complex and cross-border tax investigations and litigation before both the First-tier and Upper Tax Tribunals and courts, including the Court of Appeal.

Keziah has in-depth knowledge of customs enquiries, investigations and policy matters. She has particular expertise in the complexities of rules of origin and the Union Customs Code, as well as issues which arise post-Brexit, including the Northern Ireland Protocol. 

Keziah has acted in challenges on public law grounds by way of Judicial Review. Prior to joining RPC, Keziah worked in HMRC's Solicitor's Office gaining a varied experience across both litigation and policy advisory teams and is therefore well placed to anticipate and navigate clients through interactions with HMRC.