Lydia Southern

Tax Investigations & Dispute Resolution, Senior Disputes Adviser at FORVIS MAZARS

Lydia Southern is a Senior Disputes Adviser at Forvis Mazars, specialising in tax investigations, dispute resolution, and litigation support. With over a decade of experience in tax advisory roles across leading firms including BDO, Kreston Reeves, and WTT, Lydia brings deep technical expertise and strategic insight to complex tax matters.

Her work spans managing investigations into tax fraud and avoidance, negotiating settlements with HMRC, and representing clients in appeals and tribunal hearings. Lydia is particularly skilled in risk management, judicial review, and providing expert witness support in litigation. She is known for her ability to navigate intricate legislation and case law to build robust defence strategies for clients.

Lydia is a respected voice in the tax community, with a strong network of over 2,600 followers on LinkedIn and active engagement in thought leadership around tax disputes and tax compliance. She is based in London and plays a key role in shaping the future of tax dispute resolution at Forvis Mazars.