Quantity surveyor for investment property: the 2026 guide

If you own an Australian investment property, the largest non-cash tax deduction available to you is property depreciation. Two thirds of investors leave this deduction on the table because they have never commissioned a quantity surveyor schedule. The arithmetic is unusually clean: a schedule costs roughly $500 to $900 and typically returns $3,000 to $8,000 in first-year deductions. That is one of the cleanest tax-return moves an investor can make.

This guide walks through what a quantity surveyor actually does, when you need one, what the schedule contains, how the ATO views self-assessment versus professional engagement, and how the maths plays out across a worked example.

What a quantity surveyor actually does

A quantity surveyor is a qualified professional whose primary role in property construction is to estimate construction costs. For investment property tax purposes, the same skill set is used in reverse: estimating the original construction cost of an existing building so that the building structure itself can be depreciated under Division 43 of the Income Tax Assessment Act.

The ATO explicitly accepts a qualified quantity surveyor as a competent professional for the purpose of estimating construction cost. Your accountant, while qualified for tax compliance, is not qualified to make this estimate. That is why the quantity surveyor exists in the property tax workflow.

Division 40 versus Division 43: the two halves of property depreciation

Property depreciation in Australia splits into two distinct categories under the tax law:

• Division 40 covers plant and equipment: removable items like carpets, blinds, ovens, dishwashers, hot water systems, smoke alarms, and so on. Each item has an effective life set by the ATO (typically 5 to 15 years) and is depreciated either via the prime cost or diminishing value method. Your accountant can typically claim Division 40 from contract documentation and vendor records.
• Division 43 covers the building structure itself: the slab, frame, roof, walls, windows. Division 43 depreciation is claimed at 2.5 per cent per year of original construction cost over a 40-year effective life, but only where construction commenced after 17 July 1985. This is the big one for older investment property and the work that requires a quantity surveyor.

For a typical post-1985 investment property bought today, Division 43 deductions are usually 60 to 75 per cent of the total depreciation claim. Without a quantity surveyor schedule, those deductions are effectively unclaimed.

When you actually need a quantity surveyor

You need a quantity surveyor depreciation schedule if all three of the following apply:

1. The investment property is residential (owner-occupied properties cannot claim depreciation).
2. Construction of the property commenced after 17 July 1985.
3. You have not previously commissioned a depreciation schedule (for the same property, by you or a previous owner).

For pre-1985 properties, Division 43 depreciation is unavailable. Only Division 40 (plant and equipment) can be claimed, which materially reduces the value of a schedule. For brand-new properties bought from the developer, the developer typically provides a depreciation schedule on settlement, in which case a fresh schedule may not be needed.

What a depreciation schedule contains

A standard quantity surveyor depreciation schedule typically contains:

• A summary cover page with the property address, dates of construction and purchase, and total estimated depreciation across the effective life of the asset.
• A year-by-year deduction table, usually 40 years, showing both prime cost and diminishing value methods so you can choose the method that suits your cash-flow plan.
• An itemised plant and equipment schedule, listing every depreciable item identified at site inspection with original or estimated cost, effective life, and current written-down value.
• A Division 43 (building structure) calculation showing the estimated original construction cost and the 2.5 per cent annual deduction over 40 years.
• A summary of any low-value pool elections (items under $1,000 can be pooled and depreciated at an accelerated rate).
• Notes on any items that cannot be claimed (typically pre-1985 building components and certain second-hand plant and equipment under the 2017 rules).

The schedule is provided as a PDF and is what you hand to your accountant at tax time. The accountant uses it to populate the depreciation entries in your tax return.

A worked example: $700 in, $4,200 in year-one deductions

Consider a $750,000 detached three-bedroom house in suburban Brisbane, built in 2008, purchased in early 2026 as an investment property. The quantity surveyor undertakes a site inspection, identifies 47 depreciable plant and equipment items, estimates the original construction cost of the building structure at around $290,000, and produces a 40-year schedule.

First-year deductions on a property of this profile typically come out to:

• Division 43 (building structure): $290,000 at 2.5 per cent equals $7,250 per year. Pro-rated for partial-year ownership in year one.
• Division 40 (plant and equipment): roughly $2,500 to $4,000 in year one under the diminishing value method, depending on the age and condition of each item.
• Low-value pool: items pooled and depreciated at 37.5 per cent in the first year.

For an investor on a 37 per cent marginal tax rate plus 2 per cent Medicare levy, total year-one depreciation of around $10,800 translates to a tax saving of approximately $4,200. The schedule cost $700. Net first-year benefit: roughly $3,500, and the deduction recurs every year for 39 more years (declining each year under diminishing value).

The 2017 second-hand plant rule

The Treasury Laws Amendment (Housing Tax Integrity) Bill 2017 changed the rules for second-hand plant and equipment in residential property bought after 9 May 2017 (Budget night). Under the post-2017 rules, the buyer of an established residential property generally cannot claim depreciation on plant and equipment that was already installed in the property at the time of purchase.

This was a genuine cut to the depreciation available on older residential investment property. Division 43 (the building structure) was not affected; it remains claimable. New plant and equipment installed by the current owner after purchase remains claimable as installed. The 2017 rule applies to residential investment property only, not commercial.

Negative gearing changes from the 2026 Budget

The 12 May 2026 federal Budget announced that negative gearing on established residential investment property will be restricted to new builds from 1 July 2027. Established property purchased after 7:30pm AEST on Budget night is on the path to losing negative gearing entitlements at settlement.

Depreciation is one of the larger non-cash deductions used in negative gearing calculations. The Budget changes affect the negative gearing of net rental losses against other income, not depreciation itself, but the practical interaction matters for any investor running a negatively geared portfolio. We covered the Budget detail in our news piece on negative gearing 12 days after Budget night.

How to choose a quantity surveyor

Three things matter when choosing a quantity surveyor for a depreciation schedule:

• Australian Institute of Quantity Surveyors (AIQS) membership. AIQS membership is the standard professional accreditation. A non-AIQS firm may still be competent, but AIQS is the cleanest signal of professional qualification.
• Site inspection included. A schedule without a site inspection is less defensible if the ATO ever asks questions. Most established firms include site inspection in their standard fee.
• 40-year schedule, both methods, full ATO compliance. Standard firms produce a 40-year schedule showing both the prime cost and diminishing value methods, with all ATO compliance notes on second-hand plant restrictions and any items excluded.

Typical pricing in 2026 is $500 to $900 plus GST for a standard suburban property. For complex or large properties (multi-unit, commercial, mixed-use) pricing scales with property complexity.

Frequently asked questions

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