About Olivia Wiggett

Olivia is a tax dispute resolution specialist. This involves advising and supporting clients who are required to correspond with HMRC. These interactions with HMRC can be in various scenarios including; preparation and submission of proactive disclosures or claims to HMRC and responding to HMRC compliance checks or correspondence.

Olivia also has experience in handling more contentious interactions with HMRC such as Alternative Dispute Resolution. These situations can be particularly stressful for taxpayers and Olivia’s role is to formulate a strategy to mitigate that stress and achieve an efficient outcome for her clients.

Olivia supports a variety of taxpayers and has experience in supporting individuals, charities, trusts and businesses of all sizes.

She's a member of the Chartered Institute of Taxation and Association of Taxation Technicians, and has almost 15 years of practical tax experience, with over 10 years being spent working in specialist tax dispute resolution roles. The balance of her practical tax experience was spent working in a mixed tax advisory role.

“I enjoy working with a broad variety of clients and assisting them in bringing HMRC interactions to a conclusion. The tax landscape and rules are ever changing, which means it is easy for taxpayers to make mistakes. Corresponding with HMRC is often stressful for a taxpayer and the purpose of my role is to formulate an appropriate strategy for handling the case using my specialist tax dispute resolution knowledge and prior experience. Ultimately, I want to reduce the level of stress the taxpayer is exposed to whilst also achieving the best financial settlement possible.”

Outside of work, you'll find Olivia walking her dog (a Hungarian vizsla called Betsy) or attempting to play golf. She loves to go on holiday, whether that's hitting the ski slopes or enjoying the sunshine by a swimming pool.

RSM timeline

• 2026: promoted to Director
• 2025: joined RSM as an Associate Director

Press and media highlights:

• International Adviser – What is the future of tax evasion investigations?, February 2025
• AccountingWEB – Fraud and agent frustration cloud HMRC’s record revenues, July 2025
• Tax Notes – HMRC Bank Data Requests Could Trigger Challenges, Observers Say, January 2026
• RSM UK – HMRC tackling tax evasion: understanding COP9, April 2026
• EPrivateClient – HMRC loses case on tax assessment time limits, April 2026
• STEP – HMRC cannot penalise accidental errors going back 20 years, says tribunal, April 2026
• Taxation – What CRC v Harte tells us about discovery assessments, May 2026