What is commercial property depreciation?
Commercial property depreciation is a tax deduction that recognises the wear and tear on your building and its fixtures over time. The ATO allows you to claim a portion of the property's value as a deduction each year, reducing your taxable income without spending any additional cash.
Think of it this way: you already bought the building. Depreciation lets you claim back part of that cost, year after year, as a legitimate business expense. It is not a loophole. It is how the tax system is designed to work for investment property owners.
There are two separate categories of depreciation for commercial property, and they work differently. Division 43 covers the building itself. Division 40 covers the stuff inside it. Both are worth real money, and most investors should be claiming both.
Building structure and fixed improvements
- Walls, floors, roof, ceilings and structural elements
- Fixed plumbing, drainage and electrical wiring
- Doors, windows and fixed glazing
- Driveways, car parks and sealed areas
- Rate: 2.5% per year for up to 40 years
- Applies to buildings constructed after 20 July 1982
Removable and mechanical assets
- Air conditioning systems and units
- Lifts, escalators and mechanical services
- Carpets, blinds and window coverings
- Fire safety systems and security equipment
- Each asset depreciates at its own ATO effective life rate
- Commercial properties can claim second-hand plant and equipment
Division 43: Capital works deductions for commercial buildings
Division 43 is the big one. It covers the structural bones of the building, and for commercial property, the rate is straightforward: 2.5% of the original construction cost per year, for up to 40 years from the date construction was completed.
Here is the number that matters. A commercial building constructed for $1.2 million generates a Division 43 deduction of $30,000 every single year. No receipts to chase. No invoices to dig up. Just a flat annual claim based on the construction cost.
What qualifies under Division 43?
Division 43 covers the permanent structural elements of the building. If you cannot remove it without damaging the building, it almost certainly falls under this category.
Key eligibility rules
Not every commercial building qualifies for Division 43. The construction start date matters. For commercial properties, construction must have commenced after 20 July 1982 to be eligible for the 2.5% rate. Buildings constructed before that date do not qualify for capital works deductions at all.
If you are buying an older commercial property, do not assume there are no deductions available. Previous owners may have completed renovations, fit-outs or extensions after 1982 that do qualify. A quantity surveyor can identify these even when you do not have the original construction records.
Division 40: Plant and equipment in commercial buildings
Division 40 is where the faster deductions live. These are the removable and mechanical assets within your commercial property, and they depreciate at rates tied to their effective life as determined by the ATO's effective life determinations.
Unlike residential investment properties (where second-hand plant and equipment claims were significantly restricted from 1 July 2017), commercial properties are not subject to those same restrictions. This is a big deal. It means you can claim depreciation on second-hand plant and equipment in a commercial property even if you were not the one who originally purchased those items.
Common plant and equipment items in commercial properties
The ATO publishes effective life rates for hundreds of asset categories. Here are some of the most common items found in commercial buildings and their typical effective life:
| Asset | Typical effective life | Diminishing value rate (approx.) |
|---|---|---|
| Carpet and floor coverings | 8 years | 25% |
| Air conditioning systems | 10 to 15 years | 13% to 20% |
| Lifts and elevators | 20 to 30 years | 6.5% to 10% |
| Fire and safety systems | 15 to 20 years | 10% to 13% |
| Hot water systems | 10 to 15 years | 13% to 20% |
| Blinds and window coverings | 5 to 7 years | 28% to 40% |
| Security systems and CCTV | 7 to 10 years | 20% to 28% |
| Kitchen and kitchenette fittings | 10 to 15 years | 13% to 20% |
Effective lives are approximate and vary by asset type and condition. Always refer to the ATO's current effective life determination table and your quantity surveyor's schedule for the rates that apply to your specific property.
Diminishing value vs prime cost method
You have two options for calculating Division 40 depreciation: the diminishing value method and the prime cost (straight-line) method.
Diminishing value gives you larger deductions in the early years and smaller ones later. Prime cost spreads the deductions evenly across the asset's effective life. For most investors, diminishing value front-loads the tax benefit, which is typically preferable when you want the biggest cashflow impact now. Your accountant can advise which method suits your overall tax position.
Once you choose a method for a particular asset, you generally cannot switch later. So this is a conversation to have with your accountant before you lodge your first return for the property, not after.
Worked example: $1.2M commercial building depreciation
Numbers talk. Here is what depreciation actually looks like on a typical commercial investment property. This is a general reference example only, not a guarantee of what you will claim. Actual figures depend on your property, construction date, fit-out condition and the quantity surveyor's assessment.
Put that in perspective. On a $1.2 million commercial property, depreciation alone could put $14,000 to $16,650 back in your pocket in year one, without you spending a single extra dollar. The Division 43 component keeps delivering that $30,000 annual deduction for another 39 years. That is the power of depreciation done properly.
Depreciation schedules: what they are and why you need one
A depreciation schedule is the document that makes all of this claimable. Without one, your accountant has nothing to work with and you are leaving money on the table. It is that simple.
A qualified quantity surveyor inspects the property, identifies every claimable item under Division 43 and Division 40, calculates the annual deductions using the appropriate methods and produces a detailed report. Your accountant then uses that report to include the deductions in your tax return.
What the quantity surveyor looks at
The surveyor will identify the original construction cost (or estimate it based on the building's age, type and condition), assess all structural elements for Division 43, catalogue every piece of plant and equipment for Division 40, and calculate the remaining useful life and annual deduction for each item. They do not need the original construction invoices. A good quantity surveyor can estimate historical construction costs using industry cost data and building records.
Even without original receipts, a quantity surveyor can calculate the construction cost using historical building data, ABS construction indices and their own cost databases. For commercial buildings, this is usually the most valuable part of the schedule.
Every structural element of the building is assessed and valued. The surveyor determines the eligible construction expenditure and calculates the annual 2.5% deduction from the date of construction completion.
A full catalogue of all plant and equipment items in the property, including assets that previous owners installed. Each item is valued and assigned an effective life based on ATO determinations.
The final schedule is a year-by-year report showing every deduction you can claim. Your accountant uses this directly when preparing your tax return. Most schedules cover the full 40-year claimable period.
How much does a depreciation schedule cost?
A commercial property depreciation schedule typically costs between $600 and $3,000 depending on the property's size, type and complexity. For a standard office or retail property, expect to pay $700 to $1,500. Larger industrial, medical or multi-tenancy buildings cost more because there are more items to survey.
Here is the thing that makes it a no-brainer: the cost of the schedule itself is tax deductible. And for most commercial properties, the first year's depreciation claim alone will be multiples of what the schedule cost you. A $1,200 schedule that unlocks $38,000 in year one deductions is not an expense. It is an investment with an absurd return.
How commercial property depreciation interacts with negative gearing
This is where depreciation stops being a nice-to-know and becomes a core part of your investment strategy. Depreciation is a non-cash deduction. You do not write a cheque for it. But it still counts as a legitimate expense when calculating your property's net income position.
If your total deductions (loan interest, management fees, insurance, repairs, council rates, AND depreciation) exceed your rental income, the property is negatively geared. That net rental loss offsets your other taxable income, salary, business income, whatever, and reduces your overall tax bill.
The cashflow impact
Here is where investors often miss the full picture. A commercial property might be cashflow neutral or even slightly positive before depreciation. Rent covers the loan repayments and expenses. Fine.
But once you add $30,000 or $40,000 of depreciation deductions on top, the property shows a paper loss even though no additional cash has left your account. That paper loss reduces your taxable income, and if you are on a 37% or 45% marginal rate, the tax saving is substantial.
In practice, this means depreciation can turn a break-even commercial property into one that effectively puts cash back in your pocket through reduced tax. You are not losing money. You are just telling the ATO the building is worth less than it was last year. Which it is, because things wear out. That is the whole point.
Common commercial property depreciation mistakes
Most investors are either not claiming depreciation at all, or they are claiming it incorrectly. Either way, it costs them real money. Here are the mistakes that come up again and again.
Never getting a depreciation schedule
The most expensive mistake of all. Without a schedule from a qualified quantity surveyor, you cannot claim Division 43 or Division 40 deductions. Every year you hold the property without a schedule is a year of deductions gone forever. For a $1.2M commercial building, that is $30,000 in Division 43 deductions alone, each year, just vanishing.
Get a depreciation schedule within the first financial year of ownership.
Assuming older buildings have no deductions
Even a building from the 1970s may have had renovations, extensions or fit-outs completed after 20 July 1982 that qualify for Division 43. And all existing plant and equipment, regardless of when it was originally installed, can be assessed under Division 40 for commercial properties. A good quantity surveyor finds deductions where you assumed there were none.
Always get a survey done, regardless of the building's age.
Confusing residential and commercial rules
The 2017 changes that restricted second-hand plant and equipment claims for residential properties do not apply the same way to commercial properties. If your accountant is applying residential rules to your commercial asset, you may be missing out on significant Division 40 deductions. Commercial and residential are different asset classes with different rules.
Confirm with your accountant that commercial-specific rules are being applied.
Forgetting to update after renovations
If you complete a fit-out, refurbishment or extension on your commercial property, those new works create additional Division 43 and Division 40 entitlements. You need an updated or supplementary depreciation schedule to capture the new deductions. Do not assume your original schedule covers it.
Get a new or updated schedule after every significant renovation or fit-out.
When should a commercial investor get finance help?
Depreciation is one piece of the puzzle. The finance structure you use, the loan product, the interest rate, the repayment terms, these all interact with your depreciation position and your overall tax outcome. Getting the finance right from day one means the depreciation benefits actually work in your favour instead of being offset by a poorly structured loan.
Getting finance help makes particular sense if any of these apply to your situation:
A finance specialist can assess your borrowing capacity, recommend suitable lenders for commercial property, and help you structure the loan so your depreciation, negative gearing and cashflow all work together instead of against each other.
