Optimise Accountants - US & UK Expat Taxes

Welcome to Optimise Accountants, your trusted partner for international tax advice and support.

Founded in 2003 by Simon Misiewicz, a UK-qualified accountant (ACCA), UK tax advisor (ATT), and American tax advisor (Enrolled Agent), we have been at the forefront of providing expert tax guidance to individuals and businesses navigating the complexities of cross-border taxation. With over a decade of specialised experience in international tax advice since 2013, we are uniquely positioned to help clients understand their tax obligations and opportunities wherever they are in the world.

Our Mission

At Optimise Accountants, our mission is simple: to provide clear, effective, and personalised tax solutions for individuals and businesses facing the challenges of international relocation. Whether you’re an American moving abroad or a UK citizen seeking opportunities overseas, we are here to ensure your transition is as tax-efficient as possible. By understanding and utilising international tax treaties, we aim to help our clients minimise their tax liabilities and avoid costly mistakes.

Get in Touch

If you’re planning an international move or have already relocated and need tax advice, Optimise Accountants is here to help. Contact us today to schedule a consultation, and let us guide you through the complexities of cross-border tax planning. With our expertise and personalised approach, we’ll help you make informed decisions, reduce your tax liabilities, and ensure full compliance with both US and UK tax laws.