The capitalisation rate -- commonly referred to as the cap rate -- is one of the most widely used metrics in commercial property investment. It provides a standardised way to assess the return profile of an income-producing property and to compare assets across different locations, sizes, and sectors. Yet despite its apparent simplicity, the cap rate is frequently misunderstood or misapplied by investors.
This guide explains what a cap rate is, how to calculate it, what it tells you about a property's risk and return profile, and importantly, where its limitations lie.
1 What Is a Capitalisation Rate?
A capitalisation rate expresses the relationship between a property's net operating income and its purchase price (or market value). It is calculated using a straightforward formula:
Cap Rate = Net Operating Income / Purchase Price x 100
For example, if a commercial property generates $120,000 in net operating income per year and is purchased for $2,000,000, the cap rate is:
$120,000 / $2,000,000 x 100 = 6.0%
Net operating income (NOI) is the gross rental income less all operating expenses borne by the landlord -- including council rates, water, insurance, land tax, body corporate fees, and property management costs. It does not include mortgage repayments, depreciation, or income tax, as these vary between individual investors and are not intrinsic to the property itself.
The cap rate essentially answers the question: if I paid cash for this property, what annual return would I receive from the net rental income alone?
2 What the Cap Rate Tells You
The cap rate is a measure of both return and risk. A higher cap rate indicates a higher income return relative to the purchase price, but it also typically signals higher risk. A lower cap rate indicates a lower income return but generally reflects a lower-risk asset.
This inverse relationship between cap rate and perceived risk is fundamental to understanding commercial property valuation. A prime-grade office building in a CBD with a long-term government tenant will trade at a lower cap rate than a secondary industrial shed in a regional town with a short lease to a small business. The income stream from the first asset is considered more reliable, so investors are willing to accept a lower yield to access it.
- Low cap rate (e.g., 4% to 5%): Typically indicates a high-quality asset with strong tenant covenant, long lease term, prime location, and lower perceived risk. Investors accept a lower yield because they have greater confidence in the reliability and growth potential of the income.
- High cap rate (e.g., 7% to 9%): May indicate a secondary asset, shorter lease term, weaker tenant, less desirable location, or some other factor that introduces uncertainty into the income stream. The higher yield compensates the investor for taking on additional risk.
A high cap rate is not inherently better than a low one. It depends entirely on your risk tolerance, investment strategy, and whether the additional yield adequately compensates you for the risks involved.
3 Typical Cap Rate Ranges in Australia
Cap rates vary significantly by asset class, location, tenant quality, and lease profile. The following ranges provide a general guide for Australian commercial property, though individual assets may fall outside these bands depending on their specific characteristics.
- Industrial: 4.5% to 6% for prime metropolitan assets, with secondary assets and regional locations ranging higher.
- Office: 5% to 7% for metropolitan fringe and suburban assets. CBD prime grade typically trades at tighter yields, while secondary stock in weaker locations can exceed 8%.
- Retail: 5.5% to 7% for neighbourhood and sub-regional centres, with significant variation based on tenant mix, lease profile, and trade area demographics.
- Medical and childcare: 5% to 6% for well-located assets with long-term leases to established operators, reflecting the essential-service nature of the tenancy and the stability of demand.
These ranges shift over time in response to broader market conditions, interest rate movements, and sector-specific dynamics. Cap rates compressed significantly across all sectors during the low-interest-rate period, and have adjusted as borrowing costs have risen.
4 What Moves Cap Rates
Cap rates are not fixed -- they move in response to a range of factors that affect either the perceived risk of the asset or the broader investment environment.
- Interest rates. There is a general (though not perfectly correlated) relationship between interest rates and cap rates. When borrowing costs rise, cap rates tend to expand (move higher), because investors require a greater spread between their cost of debt and their property yield. When interest rates fall, cap rates tend to compress.
- Supply and demand. Strong investor demand for a particular asset class or location will push cap rates lower, as more capital competes for the same pool of assets. Conversely, reduced demand -- whether due to economic conditions, sector concerns, or oversupply -- will push cap rates higher.
- Tenant quality. A property leased to a national tenant with strong financial standing will trade at a tighter cap rate than the same building leased to a smaller, less established business. The tenant's creditworthiness directly affects the perceived reliability of the income stream.
- WALE (Weighted Average Lease Expiry). Longer remaining lease terms provide greater income certainty and reduce the near-term risk of vacancy. Assets with a long WALE generally trade at tighter cap rates than those with short remaining terms.
- Location. Prime locations with strong infrastructure, transport access, and tenant demand command tighter cap rates than secondary or tertiary locations, reflecting lower vacancy risk and stronger rental growth prospects.
5 Cap Rate vs Gross Yield
Cap rates and gross yields are related but distinct measures, and confusing the two is a common error among less experienced investors.
Gross yield is calculated as gross rental income divided by the purchase price. It does not deduct any operating expenses. If a property earns $150,000 in gross rent and costs $2,000,000, the gross yield is 7.5%.
Cap rate is calculated using net operating income -- gross rent less all operating expenses borne by the landlord. If those operating expenses total $30,000, the net income is $120,000 and the cap rate is 6.0%.
The difference between gross yield and cap rate reflects the operating expense burden. For net-leased industrial properties where the tenant pays all outgoings, the gross yield and cap rate may be very similar. For gross-leased office properties where the landlord bears significant outgoings, the gap between gross yield and cap rate can be substantial.
When comparing properties, always ensure you are comparing like with like. A 7% gross yield on a property with high landlord outgoings may equate to a cap rate that is materially lower than a 6% gross yield on a net-leased asset where the tenant pays all expenses.
6 Cap Rate Compression
Cap rate compression occurs when cap rates move lower over time -- meaning that the market is willing to pay a higher price for the same level of net income. It is one of the key mechanisms through which commercial property investors achieve capital growth.
If you purchase a property at a 6.5% cap rate and the market cap rate for comparable assets subsequently compresses to 5.5%, the implied value of your property has increased significantly -- even if the net income has not changed. Using the earlier example of $120,000 in net income:
- At a 6.5% cap rate: Implied value = $120,000 / 0.065 = $1,846,154
- At a 5.5% cap rate: Implied value = $120,000 / 0.055 = $2,181,818
That represents an increase in value of approximately $335,000 -- or roughly 18% -- driven entirely by cap rate compression, with no change in the underlying income.
Cap rate compression can be driven by falling interest rates, increased investor demand for a sector, improvements to the asset (such as securing a longer lease or a stronger tenant), or broader economic factors that reduce the perceived risk of commercial property.
The reverse -- cap rate expansion -- works in the opposite direction and erodes capital values. This is why rising interest rate environments can put downward pressure on commercial property values, even when rental income remains stable.
7 Using Cap Rates to Compare Properties
One of the most practical applications of the cap rate is comparing the relative value of different investment opportunities. By converting each property's income and price into a single percentage figure, you can quickly assess whether one asset offers better risk-adjusted value than another.
However, meaningful comparison requires that you adjust for differences in the factors that influence cap rates. Two properties with the same cap rate may represent very different risk profiles if one has a ten-year lease to a listed tenant and the other has a two-year lease to a sole trader. Equally, a higher cap rate does not automatically represent better value -- it may simply reflect higher risk.
When using cap rates to compare properties, consider:
- Are the net income figures calculated consistently? Have all landlord outgoings been deducted?
- Is the passing rent at, above, or below market? An inflated rent will produce an artificially high cap rate that may not be sustainable.
- What are the remaining lease terms and tenant quality for each asset?
- Are the properties in comparable locations with similar demand and supply dynamics?
8 Limitations of Cap Rates
While the cap rate is a valuable tool, it has significant limitations that investors must understand.
- Does not account for capital growth. The cap rate is a snapshot of the income return at a single point in time. It tells you nothing about the property's potential for capital appreciation, which for many investors is a significant component of total return. A property with a 5% cap rate in a high-growth corridor may deliver a far superior total return over ten years than a property with a 7% cap rate in a stagnating market.
- Does not capture vacancy risk. The cap rate assumes the property is fully leased at the current rent. It does not reflect the probability or cost of vacancy, particularly for assets with short remaining lease terms or single-tenant exposure.
- Does not account for capital expenditure. A property may have a strong cap rate today but require significant capital works in the near future -- roof replacement, facade repairs, essential services upgrades, or refurbishment to attract a new tenant. These costs are not reflected in the cap rate calculation.
- Sensitive to income assumptions. The cap rate is only as accurate as the net income figure used to calculate it. If outgoings are understated, vacancy allowances are omitted, or the passing rent is above market, the resulting cap rate will overstate the true return.
- Point-in-time measure. Cap rates reflect current market conditions and sentiment. They can shift quickly in response to interest rate changes, economic events, or shifts in investor appetite, which means a cap rate that looks attractive today may not remain so.
A cap rate is a useful starting point for evaluating a commercial property, but it should never be the only metric you rely on. A thorough investment analysis considers income growth potential, capital expenditure requirements, lease risk, and the broader market outlook alongside the cap rate.
How Bold Uses Cap Rates
In our acquisition process, the cap rate is one input among many. We use it to screen opportunities, benchmark pricing against comparable sales, and assess whether the market is pricing risk appropriately for a given asset. But we always look beyond the headline number to understand the quality and sustainability of the underlying income, the capital expenditure profile of the building, and the growth dynamics of the market.
If you are evaluating a commercial property investment and want to understand what the cap rate is really telling you about the opportunity, we would welcome a conversation about how we can help you assess the asset thoroughly and make an informed decision.