About Optimise Accountants (US & UK Property Tax Specialists).

Celebrating 20 years of providing an excellent service to our clients. Optimise Accountants was founded in 2003 by Louise and Simon Misiewicz are a wife and husband team. We see our employees are part of a growing family, and we include our clients in the same notion.

We believe in giving you and other landlords the very best service. This is why we have a telephone booking system to allow you to book time with us within two working days to answer those property tax questions by a qualified property accountant/tax advisor.

Optimise Accountants is designed to help property investors, developers, and landlords save tax on their property portfolios. We provide accounting support and pro-active tax support whenever clients need it. We wish to give clients comfort and confidence in their tax planning, be it in the United Kingdom (UK) or the United States (US).

Our pedigree as UK property accountants and property tax specialists .

Introducing Our UK Property Accountants: Building Wealth and Reducing Tax for US and UK Real Estate Investors

Since 2003, our team of UK-based property accountants at Optimise Accountants has been dedicated to serving US and UK real estate property investors and developers. Our mission is simple: to help you build wealth while minimising tax liabilities.

Navigating the complexities of UK property tax can be a daunting task. That's why we've made it our sole focus to specialise in the UK buy-to-let market and property development. We believe in being masters of our craft and not spreading ourselves too thin across multiple industries. We are here to provide expert guidance tailored to your property investment needs.

Rest assured that our UK property accountants and tax specialists are all highly qualified professionals. We understand the importance of trust and efficiency when addressing your queries and promptly providing accurate answers.

UK accountancy accreditation: Each team member holds prestigious qualifications such as ACCA (Association of Chartered Certified Accountants) or ICAEW (Institute of Chartered Accountants). These qualifications demonstrate our commitment to maintaining high professionalism and expertise.

UK tax accreditation: Our proactive tax advice is also delivered by our qualified UK property tax specialists, who hold the esteemed ATT (Association of Taxation Technicians) qualification. This specialised expertise is crucial when offering proactive tax advice tailored to the unique challenges and opportunities within the property investment landscape.

While ACCA/ICAEW qualifications are sufficient for preparing self-assessments and limited company accounts, we recognise that providing proactive tax advice requires a deep understanding of property tax intricacies, which our ATT-qualified specialists bring to the table.

We proudly cater to the needs of Americans investing in the United Kingdom and Brits moving or investing in the United States (US). As part of our commitment to providing comprehensive tax services, we have made significant investments in our staff, ensuring they hold the esteemed Enrolled Agent (EA) accreditation from the Internal Revenue Service (IRS). This accreditation empowers us to expertly handle the preparation and filing of various tax returns, including 1040 for individuals and the 1120 for companies, with the IRS.

Optimise Accountants is committed to giving you the confidence and peace of mind to navigate the complex US & UK property tax world. Our specialised knowledge, qualifications, and dedication to delivering prompt and accurate advice set us apart as your trusted partners in property wealth creation.

Take the first step towards optimising your property investments today. Contact our team of US &UK property accountants and tax specialists to schedule a consultation tailored to your specific needs.

Meet the team.

Optimise Accountants takes immense pride in creating a work environment that fosters happiness and growth for our property accountants and property tax specialists. We firmly believe caring for our team members translates into exceptional client service. That's why we go above and beyond to prioritise their well-being and professional development.

We understand the importance of work-life balance. We offer flexible working arrangements, including the option to work from home. We listen attentively to our employees' needs and take prompt action to support them, ensuring a harmonious work experience catering to their circumstances.

Continuous learning is at the heart of our culture. We provide ongoing training and support to empower our team members, enabling them to excel in their roles and achieve personal and professional growth. By investing in their success, we equip them with the knowledge and skills needed to deliver accurate information and exceptional service to our valued clients.

But our commitment to care extends beyond professional development. We genuinely value each person who interacts with Optimise Accountants. Our goal is not only to provide accurate information but to do so in a manner that instils peace of mind, confidence, and comfort. We believe in building nurturing and caring relationships with our clients, ensuring that they feel heard, understood, and supported every step of the way.

Let's embark on a journey of growth, success, and meaningful connections together.

Simon Misiewicz.
Founder & Director


Are you a seasoned property investor seeking expert guidance for your buy-to-let property investments and developments in the United States and the United Kingdom? Look no further! Meet Simon, a highly experienced property investor and dedicated US & UK property tax specialist.

Simon's dedication to providing exceptional service goes beyond delivering accurate information. He takes the time to understand your individual circumstances, aspirations, and risk tolerance, ensuring that his guidance is tailored to your specific needs. By building a strong client relationship based on trust and open communication, Simon creates an environment that fosters long-term success for his clients.

Louise Misiewicz.
UK Operations Director


As the co-owner of Optimise Accountants, Louise plays a pivotal role in managing the day-to-day operations of our business. Her expertise and leadership ensure that our property accountants and tax specialists are equipped to provide the best solutions to our valued clients.

Louise's focus extends beyond day-to-day operations; she is also dedicated to optimising our Key Performance Indicators (KPIs) to ensure timely and efficient service delivery. Through her meticulous oversight, we have achieved remarkable turnaround times, completing self-assessments within two weeks and limited company accounts within three weeks. This exceptional efficiency saves our clients valuable time and ensures that their accounts are tax-efficient and compliant.

Muhammed Ahmed.
Tax Advisor


Linette Coe.
Tax Manager


Ghania Ali.
Lead Accountant


Sheba Rani.
Lead Accountant


Daniel Gibbs.
Lead Accountant


We love our clients, and they love us.

Book a call to see how we can help you.


Consultation options.

We offer the two following options for initial consultations.


Our Ongoing Accountancy Services

We charge on a fixed monthly fee

  • - Accounts submitted to HMRC & Companies House

  • - Tax support when needed (no extra charge)

  • - An holistic review of your tax structure and future plans

  • - Annual tax return review to discuss future tax plans


Tax Call + Report + Video Recording

Want tax advice right now? Book today

  • - Upload your questions in advance

  • - A qualified tax advisors discuss the very best solution with you

  • - A tax report & meeting recording is sent within 48 hours

  • - Clarification questions are answered via email

Booking your appointment.