Mark Kilroy

Mark Kilroy is a Chartered Quantity Surveyor (MRICS), Registered Tax Agent and Founder of Koste — one of Australia's most-cited voices on tax depreciation and the holding-phase mechanics that decide property investor outcomes.

Mark Kilroy is a Chartered Quantity Surveyor (MRICS), Registered Tax Agent and Founder of Koste Chartered Quantity Surveyors. With 25+ years across Australia, the UK and the US, he is one of the country's most-cited voices on construction cost, tax depreciation and the holding-phase mechanics that decide property investor outcomes.

Mark Kilroy is a Chartered Quantity Surveyor (MRICS), Registered Tax Agent and Founder of Koste Chartered Quantity Surveyors — the only firm in Australia recognised by RICS for specialising exclusively in asset and tax depreciation. Over a 25+ year career across Australia, the UK and the US, Mark has worked on the technical detail behind thousands of property and infrastructure assets. He is the author of The HOLD System and creator of the Kilroy Curve, frameworks that explain why most property investors fail in the holding phase rather than at acquisition. Mark writes regular commentary on Federal Budget measures, depreciation policy, construction insolvency and the tax mechanics most public debate skips over.

Mark Kilroy is a Chartered Quantity Surveyor (MRICS), Registered Tax Agent and Founder of Koste Chartered Quantity Surveyors — the only firm in Australia recognised by the Royal Institution of Chartered Surveyors for specialising exclusively in asset and tax depreciation. Over a 25+ year career across Australia, the United Kingdom and the United States, Mark has worked on the cost mechanics behind thousands of property and infrastructure assets, ranging from individual investor portfolios to listed-fund property holdings. Mark is the author of The HOLD System, a framework that argues most property investors do not fail because they bought the wrong asset — they fail because pressure builds during the holding phase, when interest costs, tax settings, depreciation, council rates and insurance interact in ways that compress cash flow until the asset has to be sold. He is also the creator of the Kilroy Curve, which maps how construction cost movements lag policy announcements by 18–36 months and what that means for investor decision-making. Mark publishes regular commentary on Federal Budget measures, depreciation policy, construction insolvency, the construction labour shortage and Brisbane 2032 readiness. His analysis is sought by property investors, accountants, advisers and journalists who need the technical detail one layer below the headlines. He is available for keynote speaking, panel discussions, podcast interviews and broadcast comment, particularly around budget cycles, housing policy announcements and tax reform.