Sarah McQuillan - Director.

Sarah is a Director in Buzzacott’s Expatriate Tax Services team. Sarah is a dual-qualified Chartered Tax Adviser and IRS Enrolled Agent with over a decade’s worth of experience working in the industry. Her clients are typically US citizens and green card holders resident in the UK and UK resident non-domiciled individuals with a wide range of portfolios and issues. Sarah often works on all things concerning US and UK tax returns, IRS streamlined submissions, expatriation and foreign tax credit planning. Within the firm, she works closely with the Financial Planning and Private Clients teams and has experience working with family lawyers to advise on the tax consequences of divorce where one or both spouses are US persons.

Outside of work Sarah enjoys music (playing regularly in a local wind band), going to the theatre and watching football and tennis.


You might also be interested in… Expatriate tax.

We know how both systems work from the inside, out. Talk to us about how best to manage your income, reduce liability and pay the correct local tax. We’ve had the pleasure of supporting many internationally mobile workers through pivotal stages in their lives from our London office. Buzzacott’s Hong Kong team looks after US and UK nationals living across Southeast Asia.

  • UK tax advice
  • US tax returns for UK-residing American citizens
  • UK tax returns for non-UK residents with UK source income
  • UK tax advice about UK statutory residency rules
  • Pre-departure/arrival planning, including assignment structuring
  • Inheritance tax advice

Help with US tax services

  • Residence and domicile issues
  • US & UK Tax return compliance
  • Cross-border trust and estate tax 
  • Dual US/UK qualified charities 
  • FATCA/CRS advice 
  • International Pension & Tax Reporting & Advice 
  • Mixed Fund Analysis 
  • US/UK Divorce Tax Advice 
  • US/UK Share Schemes Tax Advice 
  • Expatriation
  • US residents in Hong Kong 

Global Mobility

We work hand-in-hand with our Global Mobility team who can advise you on managing an international workforce. And you’re welcome to share your queries with Buzzacott’s other specialists, from HR to financial planning. Thanks to our membership of the PrimeGlobal international association, we can also connect you with trusted experts worldwide who deliver the same quality of service you expect from us.