Meet Koste - Koste

Meet Koste

Tax depreciation experts and
leading providers in Australia

About us

Since its inception in 2012 from a modest office on Cavill Avenue, Surfers Paradise, Koste has consistently been at the forefront of innovation in the tax depreciation sector. Pioneering the adoption of Virtual Site Inspections, we set a new industry standard.

We were also the first to introduce fixed price structures for residential reports, ensuring transparency and trust. Furthermore, our trailblazing spirit led to the creation of specialist tax depreciation software, now utilized by hundreds of partners to produce white-label reports. With over 40,000 reports for clients across Australia, our growth is a testament to our unparalleled expertise and service. Founded by Mark Kilroy, a renowned expert in the field, Koste boasts a robust team of Quantity Surveyors nationwide. Our commitment to professionalism and results, combined with our innovative strides, solidifies Koste as the premier choice for tax depreciation needs.

Dear valued clients and partners

At Koste, our commitment goes beyond just providing a service; it’s about delivering excellence.

With every report we prepare, our promise is to meticulously ensure that you claim every deduction you’re entitled to, leveraging the latest tax legislation. Our journey in this field has been marked by a relentless pursuit of expertise and a genuine care for our clients. As the founder, I take immense pride in our team’s dedication and the trust you place in us. Rest assured, with Koste, you’re not just choosing a service provider, but a partner who truly champions your financial interests.
Warm regards, Mark Kilroy

Our Journey

Starting in 2012, Koste set out from Brisbane with a vision to reshape tax depreciation in Australia.

Our growth was swift, expanding to major cities by 2016 and strategically acquiring KC Partnership in 2017. With the introduction of EDepreciation in 2018 and our innovative Capal software in 2020, we solidified our commitment to cutting-edge solutions. The challenges of COVID-19 spurred us to further invest in technology, ensuring we not only met but elevated industry standards. Today, Koste stands as a beacon of innovation, resilience, and unwavering dedication to our clients.

Meet our Directors

Mark Kilroy

Founder & CEO
MRICS MAIQS Bsc (Hons) Quantity Surveying

Mark Kilroy is a seasoned Chartered Quantity Surveyor and the visionary CEO and Founder of the Koste Group. With nearly 20 years of experience in the property industry, Mark has worked with global giants like Ernst & Young, BP, Caltex, Land, and CBRE. His expertise extends beyond traditional asset management; he is a Registered Tax Agent, a Board Member of the Gold Coast Chamber, and a Committee Member for the Australian Institute of Quantity Surveyors (AIQS). Mark is also a specialist advisor on Tax Depreciation and Asset Services.

Claire Kilroy

Co-Founder & Director
BA (Hons)

Claire is one of the founding partners of Koste Group. With a background in Property and Marketing, Claire understands property and the importance of communicating our brand message. As a property investor both in Australia and the UK, Claire is passionate about property. For the last 12 months, Claire has been playing a key role in the expansion of new services to add to our brand, including Huse, eKoste client portal, and eDepreciation.

Sean Connolly

BSc (Hons) Quantity Surveyors, MAIQS)

Sean is regarded as one of Australia’s leading specialists in Tax Depreciation, with over two decades of experience. His consulting role includes large business organisations and professional groups, strengthening his image as an industry specialist.

Values & Culture


At Koste, we pride ourselves on housing the industry’s finest. Our team embodies the pinnacle of knowledge and skill, ensuring that our clients receive unparalleled advice and service in the realm of tax depreciation.


Beyond professionalism, our team is driven by a genuine fervor for what we do. This passion is evident in every project, ensuring each client feels valued and understood.

Client Focus

Our clients are at the heart of everything we do. We prioritise their needs, ensuring tailored solutions and a commitment to their financial success.


Collaboration and cohesion define our approach. At Koste, we believe in harnessing our collective expertise, ensuring that challenges are met head-on and solutions exceed expectations.

Work with us

Koste is committed to creating a diverse workplace environment and is proud to be an equal opportunity employer.

We employ qualified Quantity Surveyors to prepare the Tax Depreciation Schedules and provide in-house on-going professional training to our staff.

Thinking of starting a career in the Construction and Taxation industry? There are exciting opportunities to join our team at Koste as a Quantity Surveyor or Business Affiliate. Both full-time and part-time positions are currently available.

Get in contact


Working closely with The University of Queensland (UQ), Bond University, and The Queensland University of Technology (QUT), Koste provides a 3-month internship program at our Gold Coast headquarters. Interns will gain industry work experience and put theory into practice during their internship.

Become an
Outsource Partner

As a Koste outsource partner, you will be able to receive all the support you need to provide your clients with tax depreciation reports. It includes free software that you can use to generate reports for your clients, marketing tool kits, and monthly blog articles. We are here to grow your business with you and build a long-term partnership. As a long-term Koste business partner, we aim to help you grow your business together.

Learn More

Our Contributions to Charity

Koste Tax Depreciation has always valued the opportunity to give back to the community. We care about our society and try our best to invest in our community whenever we can. Giving back to society strengthens our ties to the local community and our bond with Australia and the rest of the world.

We at Koste would like to express our gratitude to all of our loyal clients who have trusted us to help them raise thousands for various charities over the years. Additionally, Koste encourages individuals to realise their full potential by starting their own businesses, which we support.


Kiva is a loan platform that helps more than 1.7 billion people around the world who cannot get bank financing to start a business. Using Kiva’s services, students can pay for their education, and female entrepreneurs can start their businesses! In addition, farmers are able to invest in equipment, and families can afford emergency care whenever needed.

In collaboration with Kiva, Koste has made investments in start-ups in need of financial support. Many of these companies have been in the food, education, and agricultural sectors for many years. Our initial investment has helped individual small business owners located from the Philippines to Fiji. We have also helped entrepreneurs set up a business and provide for their families, which we are all very proud of.
For more information about Kiva, please visit

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