What does Mark Kilroy do?

    Mark Kilroy provides tax depreciation schedules, construction cost analysis and asset advisory services for Australian property investors, business owners and corporate clients. Work is delivered through Koste Chartered Quantity Surveyors, one of a small number of Australian RICS-regulated firms specialising in tax depreciation, and is grounded in 25+ years of experience across Australia, the UK and the US. Every engagement is approached as a long-term decision framework rather than a one-off compliance report.

    Who I Work With

    Correcting the overlooked.
    Precision where it matters.

    Tax depreciation is one of Australia’s most underutilised areas of tax planning. My work is focused on correcting that.

    Property Investors

    I help investors improve cash flow by aligning depreciation strategy with holding period, financing, and long-term portfolio objectives.

    Business Owners

    I assist businesses in managing rising costs by ensuring construction assets are correctly identified, documented, and depreciated in accordance with legislation.

    Corporate & Institutional

    I advise on complex construction cost allocations and depreciation strategy across large and diverse asset bases, where governance and audit standards are critical.

    How I create a strategic advantage

    I do not approach depreciation as a reporting exercise. I approach it as a decision framework with long-term implications.

    Through CAPAL, Koste.ai's proprietary asset and cost analysis platform, I combine decades of quantity surveying expertise with advanced data modelling to identify and classify construction assets with a level of precision that is often missed by traditional approaches.

    The Result

    Depreciation is integrated into broader financial and tax planning, rather than treated as a one-off compliance task.

    • Legitimate tax depreciation strategies applied.
    • Materially improved after-tax outcomes.
    • Decisions made correctly and documented properly.
    Paid Diagnostic Service

    The HOLD Review

    A structured diagnostic for property owners who want to understand whether their asset can be held safely, efficiently, and strategically.

    Most property advice ends at acquisition. The HOLD Review focuses on what happens after—when rising costs, interest rate changes, and policy shifts quietly determine outcomes.

    Learn More About the HOLD Review

    What the review covers:

    H

    Hold Resilience

    Can the asset endure if conditions tighten?

    O

    Optimisation

    Where structures are no longer working

    L

    Leakage

    Where money is lost quietly and repeatedly

    D

    Decision Timing

    Which decisions materially affect outcomes

    Residential from$1,950 + GST

    Trusted By Leading Brands

    KPMG
    Charter Hall
    Dexus
    Herron Todd White
    Crystalbrook Collection
    Jim's Building Inspections
    Client Success

    Trusted by industry leaders.

    "Mark's strategic approach to tax depreciation has completely transformed our portfolio's cash flow position. His attention to detail is unmatched."

    Sarah Jenkins

    Property Developer, Sydney

    "Working with Mark gave us clarity we didn't know we were missing. He doesn't just look at the numbers; he looks at the lifecycle of the asset."

    James Thorne

    CEO, Thorne Logistics

    "The depth of knowledge Mark brings to the table is incredible. He found legitimate deductions that our previous quantity surveyors had completely overlooked."

    Elena Rossi

    Commercial Investor

    Frequently Asked Questions

    Common questions about working with Mark

    What does a Chartered Quantity Surveyor do for property investors?

    A Chartered Quantity Surveyor (MRICS) prepares legally defensible reports on construction costs and tax depreciation. For property investors, that means an ATO-compliant depreciation schedule that identifies every Division 40 plant and equipment item and Division 43 capital works component in the property, so the right deductions are claimed each year and the cost base is correctly tracked at sale.

    Who needs a tax depreciation schedule in Australia?

    Any owner of an income-producing property — residential, commercial or specialised — can benefit from a depreciation schedule. The deduction reduces taxable income each year and improves cash flow during the holding period. The schedule is a one-off cost that is itself deductible.

    What is the HOLD Review and who is it for?

    The HOLD Review is a paid diagnostic for property owners who want to understand whether their asset can be held safely, efficiently and strategically through changing conditions. It assesses Hold resilience, Optimisation, Leakage and Decision timing, and is priced from $1,950 + GST for residential property.

    How is Mark Kilroy different from a generic depreciation firm?

    Mark holds both professional designations the field recognises — Chartered Quantity Surveyor through RICS and Certified Quantity Surveyor through AIQS — and is also a Registered Tax Agent. His firm Koste is one of a small number of Australian RICS-regulated practices specialising in tax depreciation. The work is approached as a long-term decision framework, not a one-off compliance task.

    Do you work with accountants and other advisers?

    Yes. Much of the work is described as 'advising the advisors' — supporting accountants, tax specialists and property professionals on situations where interpretation, documentation and defensibility of construction costs and depreciation positions matter.

    Where in Australia do you provide services?

    Mark works with clients across all Australian states and territories, with reports completed across every property category from residential through to specialised commercial.