Market Value vs Investment Value vs Fair Value Explained

One development site can carry three different numbers at once, and they are not interchangeable. Market value is the price the open market would pay. Investment value is the price a particular developer can justify given their own returns, costs and tax position. Fair value is an accounting number, an exit price used to measure the asset in financial statements. Confuse them and you overpay in a negotiation, argue past your valuer, or misstate an asset on your balance sheet.

This guide sets out what each term means, where the definitions come from, and how a developer should use each one when buying a site, funding a project, dealing with the tax office, and reporting to investors. It is written for the person working out whether a deal stacks up, not for a first home buyer, so the framing throughout is build, cost and margin.

What is the difference between market value, investment value and fair value?

Market value is what a willing but not anxious buyer would pay a willing but not anxious seller in the open market. It is deliberately impersonal: it strips out anything special about a particular buyer. Investment value is the opposite. It is the value of the same asset to one specific developer, given that developer’s target return, cost of capital, tax position, and any synergies with land they already hold. Fair value is a third thing again. It is an accounting measurement basis, defined for financial reporting as the price to sell an asset in an orderly transaction between market participants, and for most real property it lands very close to market value.

The single most useful way to hold the three apart:

• Market value answers “what would the market pay?” It is objective, hypothetical, and the same regardless of who is asking.
• Investment value answers “what is it worth to me, on my numbers?” It is subjective and different for every developer.
• Fair value answers “what number goes in the financial statements?” It is an accounting basis, usually aligned with market value.

A gap between market value and your investment value is not an error. It is the whole game. If your investment value sits above market value, there is headroom in the deal. If it sits below, the market is asking more than the site is worth on your numbers.

What does market value actually mean for a development site?

Market value is the estimated amount a site should exchange for on the valuation date between a willing buyer and a willing seller acting knowledgeably, prudently and without compulsion, after proper marketing. That wording is not casual. It is the definition adopted across the industry through the International Valuation Standards, which every Certified Practising Valuer in Australia works to.

For tax and legal purposes in Australia the same idea has a longer history. The courts settled the meaning of market value in Spencer v The Commonwealth (1907) 5 CLR 418, which frames it as the price a willing but not anxious buyer would pay a willing but not anxious seller, both fully informed and acting at arm’s length. The Australian Taxation Office (ATO) still relies on that test today, and its market valuation for tax purposes guide confirms that where a tax provision does not define market value, it takes this ordinary Spencer meaning.

Two features of that definition matter for developers. First, market value assumes an arm’s length deal with no special buyer, so it excludes any premium that only you would pay. Second, market value for a development site is assessed on its highest and best use, not its current use. A tired weatherboard on a site zoned for a six-storey residential flat building is valued for the flat building the market believes could be approved and built, less the cost, time and risk of getting there.

How is the market value of a development site worked out?

Valuers generally reach the market value of a development site one of two ways: by direct comparison to recent sales of similar sites, or by the hypothetical development method (also called the residual method) where comparable sales are thin. Large undeveloped parcels earmarked for subdivision, often called englobo or “in globo” land, are usually valued this way because genuinely comparable sales are scarce.

The residual method runs the project the market expects on the site, takes the gross realisation value of the finished product, deducts every development cost plus a market allowance for profit and risk, and treats what is left as the value of the land. It is the same logic a developer uses to work out the most they can pay, which is why market value and investment value are close cousins that happen to use different profit and cost assumptions. The market’s residual uses a typical developer’s return and typical costs. Your residual uses yours.

Why does the valuer’s number differ from your offer?

The valuer is estimating what the market would pay, not what the site is worth to you. A valuer builds market value from settled comparable sales and market-standard assumptions about profit, timing and finance. Your offer reflects your build, your programme, your funding, and what you can do with the site that an average buyer cannot. Those are different questions, so different answers are normal rather than a sign that one party is wrong.

This gap becomes a practical problem in two places. When you buy, the price you agree may sit above the valuer’s market value because your investment value is higher, and a lender will generally lend against the lower market value, not your price. When you sell a completed project, a buyer’s offer may sit below your expectation because their investment value, on their cost of capital, is lower than yours was.

What is the difference between “as is” and “on completion” market value?

“As is” market value is the site today, in its current state; “on completion” market value is the finished project as if it were already built and, in some instructions, fully leased or sold. Both are market values on the same Spencer and International Valuation Standards basis. They just fix the valuation date and the physical assumption differently, and a developer meets both on the same project.

Your lender usually orders both when you seek construction finance. The “as is” figure supports the land loan and confirms you have not overpaid on the acquisition. The “on completion” figure, sometimes written “as if complete”, sets the value the completed development is expected to reach and caps the senior debt the bank will advance against it. Valuers typically assess the on-completion figure on settled comparable evidence and a conservative view of the sales programme, so it often lands below the gross realisation value in your own feasibility. That gap is not the valuer being difficult; it is the difference between a market participant’s cautious view and a developer’s target. Funding modelled on a developer’s best case rather than the valuer’s likely on-completion figure is where the equity shortfall surfaces late, once construction is committed and hard to unwind.

What is investment value, and why is it different for every developer?

Investment value is the value of an asset to a specific owner or prospective owner, judged on that party’s own objectives and circumstances rather than the open market. The International Valuation Standards describe it as an entity-specific basis that reflects the benefits the asset brings to that particular entity, with no assumed sale. In plain terms, it is the number your own feasibility produces: the most you can pay for the site and still hit your target return.

The inputs that make investment value personal are the inputs the market cannot see:

• Your target margin or return. A developer chasing a 20% development margin on cost will back-solve a lower land price than one who will accept 15% for the same finished product.
• Your cost of capital. Cheaper equity and debt lift the price you can justify; expensive mezzanine finance drags it down.
• Your build cost and programme. A builder-developer with in-house trades, or a group that can start sooner, carries lower cost and less holding time, so the site is worth more to them.
• Your tax position. Available losses, the capital gains tax treatment of the entity, and Goods and Services Tax (GST) recovery all change the after-tax residual.
• Synergies. Land you already own next door, or a planning approval you can replicate, can push your investment value well above what the market would pay.

Because investment value is a residual, it is also very sensitive to the assumptions behind it. Small changes in assumed sale rates, build cost, or finance can move the land price a developer can justify by a large margin, which is why a residual land value is generally stress-tested across a range of inputs rather than run once.

A worked example: one site, two developers

Consider a 1,200 square metre corner site approved for eight townhouses, with an expected gross realisation value of $9.6 million and total development costs, excluding land, of around $6.4 million.

Developer A wants a 20% margin on total development cost and funds with a mix of bank debt and their own equity. On those numbers the most they can pay for the land, before duty and acquisition costs, may work out near $1.6 million.

Developer B will accept an 18% margin, already owns the adjoining lot which improves the built form and lifts expected sale rates, and has cheaper equity. On a gross realisation nearer $10.0 million once the amalgamated site is taken into account, the same land may be worth closer to $2.1 million on their numbers.

The market value sits somewhere in the range the evidence supports, likely between those two figures. Both developers are right, because investment value is meant to differ. The point of running your own residual is to know your number before you walk into the negotiation, so you can compete where the site is worth more to you and walk away where it is not. Because investment value drives the return metrics you actually report, it ties directly to your project internal rate of return: the land price you pay is the single biggest lever on the return the deal produces.

When does investment value sit legitimately above market value?

Investment value rises above market value when a specific buyer can extract value the average buyer cannot. The clearest case is site amalgamation, sometimes called marriage value or synergistic value: two adjoining parcels, each modest on its own, are worth more combined than the sum of the two because the larger site supports a better yield and a more efficient built form. To the owner of one lot, the neighbouring lot carries a special value that no third party would pay, so their investment value for it is higher than its market value.

The International Valuation Standards treat this as synergistic value, a separate basis again, and it is worth naming because it explains why developers sometimes pay what looks like an over-market price for an infill lot. They are not overpaying. They are paying up to their investment value, which the amalgamation has lifted above the market’s number. The trap is paying the full synergistic value away to the vendor and keeping none of the upside, which is why the premium is generally treated as a reason to act rather than a figure to hand across in full.

What is fair value, and is it the same as market value?

Fair value is an accounting measurement basis, and for most property it is close to, but not identical with, market value. Under AASB 13 Fair Value Measurement, the accounting standard issued by the Australian Accounting Standards Board (AASB), fair value is the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. It is an exit price, market-based, and it assumes the sale happens in the market that is principal or most advantageous for the asset.

Because AASB 13 fair value is built on market participant assumptions rather than one entity’s own view, it is not entity-specific the way investment value is. For real property, the accounting definition of fair value is generally consistent with the International Valuation Standards concept of market value, so a valuer certifying market value and an accountant reporting fair value will usually land on the same number for the same asset. Developers meet fair value most often when a completed project is held rather than sold, and the asset sits on the balance sheet as investment property measured under AASB 140 Investment Property.

The trap is the word “fair”, which is used loosely in three different ways:

• Accounting fair value (AASB 13). A market-based exit price for financial reporting. Close to market value for property.
• Fair value as a valuation basis in the International Valuation Standards. Renamed to “equitable value” in the standards to stop this exact confusion. It is the price between two identified, willing parties reflecting their respective interests, which can differ from open-market value. It appears in shareholder buy-outs, related-party transfers, and joint venture entry or exit.
• “Fair market value” as spoken in the market. A colloquial phrase, common in United States sources, that usually just means market value. It is not a separate Australian standard.

So “fair value” alone is ambiguous. For a balance sheet, it means the AASB 13 accounting basis. In a valuation instructed under the International Valuation Standards, it now means equitable value between identified parties. In casual conversation, it usually means market value. Which of the three is meant is worth establishing before relying on a number described as “fair”.

How do the valuation standards define these terms?

The definitions are set by the International Valuation Standards, published by the International Valuation Standards Council, and the current edition took effect on 31 January 2025. That edition sets out the recognised bases of value in its Bases of Value chapter: market value, market rent, investment value, equitable value, synergistic value and liquidation value. Each is a distinct basis with its own definition, and a valuer must state which one they are using and why.

In Australia the standards are adopted in full by the Australian Property Institute, the professional body for valuers. Australian Property Institute members carry out mortgage valuation work under a Professional Standards Scheme, which is why the major lenders generally require a valuer who is an Australian Property Institute member. The Institute also issues Australia and New Zealand guidance papers that sit alongside the international standards, including the guidance on valuations for mortgage and loan security purposes that governs the valuation your lender relies on.

For New Zealand developers, the same international standards apply. The Property Institute of New Zealand adopts the International Valuation Standards effective 31 January 2025 as mandatory for its members, and the two institutes publish shared Australia and New Zealand guidance papers. So the definitions of market value, investment value and equitable value read the same on both sides of the Tasman, even though the surrounding tax and planning rules differ. A New Zealand valuer certifying market value for a development site is working to the same definition as an Australian one.

Why does “market value” mean something different to the Valuer-General?

The Valuer-General’s statutory land value is not the market value of your site, and it is not what you would pay for it. Each state and territory has a government valuer who assigns a statutory value to every parcel each year, and that value drives council rates and land tax. It is a specific, legislated basis, usually the value of the land only on its highest and best use, and it deliberately ignores the buildings and, in most states, the development potential a buyer would actually pay for. Developers who treat the Valuer-General’s figure as a market appraisal of the site tend to be surprised in both directions.

The basis and the label change from state to state, which matters because the statutory value feeds your land holding costs through land tax and rates while you hold a site before construction.

Two points a developer should carry from that table. Western Australia’s council rating basis is called gross rental value, abbreviated the same way as the gross realisation value used in your feasibility, so watch which one a document means. And because most states levy land tax on the land-only statutory value, holding a rezoned or high-value site through a long approval period can generate a land tax bill that materially affects your holding costs, even though no income is coming in. Always confirm the current basis and thresholds with the relevant state revenue office, because these are reviewed regularly.

Why is duty charged on the greater of price and market value?

Transfer duty is assessed on the dutiable value, which every state defines as the greater of the consideration you pay or the unencumbered market value of the property. The rule exists to stop parties writing down the price on paper to reduce duty. Under section 21 of the Duties Act 1997 (NSW), for example, dutiable value is the greater of consideration and unencumbered value, and Victoria, Queensland, Western Australia and the other jurisdictions all run the same test through their own Duties Acts. Revenue NSW guidance on determining the dutiable value and the Queensland Revenue Office guidance on calculating transfer duty both set out when an independent market valuation is required, which is typically any related-party or non-arm’s-length transfer.

For a developer this means two things. In an arm’s length purchase, duty is almost always assessed on the price paid, because a genuine market price is the best evidence of market value. In a related-party transfer, a transfer between entities under common control, or a deal with no clear consideration, the revenue office will look for market value evidence and assess duty on that. A duty figure is carried into a feasibility as a cost line worked out separately, and the standalone stamp duty calculators produce that figure state by state.

How does this work for New Zealand developers?

The three valuation bases read the same in New Zealand, but the statutory and tax layer around them is different. Market value, investment value and equitable value are defined by the same International Valuation Standards the Property Institute of New Zealand adopts, so a New Zealand valuer certifying market value for a development site is working to the identical definition as an Australian one. The differences are in what the state does with those numbers.

New Zealand has no stamp duty and no general land tax, so the biggest Australian holding-cost driver, land tax on a statutory land value, simply does not apply. What does apply is council rating. Under the Rating Valuations Act 1998, councils hold a rating valuation for every property, usually expressed as capital value, land value and value of improvements, and rates are struck against one of those. As in Australia, the rating value is a mass-appraisal figure for setting rates, not a market appraisal of your site’s development potential, so it should not anchor a purchase decision.

On the tax side, market value on an arm’s length basis is the reference point for related-party and non-market transfers, and it matters for the bright-line test, New Zealand’s tax on gains from residential land sold within a set period. For residential property acquired on or after 1 July 2024, the bright-line period is two years, and transfers between associated parties are generally treated as taking place at market value rather than the price on the paper. A New Zealand developer therefore uses the same investment value discipline on acquisition, the same market value for funding and tax, and fair value under New Zealand equivalent accounting standards for any asset held on the balance sheet.

Which value should you use, and when?

The basis that applies depends on the decision in front of you, because the right number depends entirely on why the question is being asked. The same site genuinely has different correct values for a purchase negotiation, a loan application, a tax return and a set of financial statements, and using the wrong one is a common and expensive mistake.

• Buying a site. The decision runs on investment value; the negotiation runs against market value. The residual land value sets the most a developer can pay, and independent market evidence is what shows whether the asking price is realistic and where the negotiation is likely to land.
• Funding a project. The lender relies on market value, not the price paid or the buyer’s investment value. Bank valuations usually come in two flavours: “as is” market value for the site today, and “on completion” (or “as if complete”) value for the finished product, which underpins the loan to value ratio on the construction facility. The on-completion figure is typically assessed conservatively against a developer’s own gross realisation value.
• Dealing with the tax office. Market value on the Spencer basis is the reference point for capital gains tax, GST and duty. Where the transaction is not arm’s length, the position generally has to be supported by a valuation from a qualified valuer.
• Reporting to investors or holding an asset. Financial statements use fair value under AASB 13. For a completed project held as investment property, that fair value is generally consistent with market value.
• Compulsory acquisition. If a site is resumed by an authority, compensation is based on market value plus disturbance under just terms legislation such as the Land Acquisition (Just Terms Compensation) Act 1991 (NSW), not on the owner’s investment value, which is the gap that arises when a strategic site is resumed.

An income-producing asset: investment value and the cap rate

For a commercial or income-producing project, investment value and market value both often run through the capitalisation of income, but with different inputs. Market value applies a market capitalisation rate to sustainable market rent. Your investment value might apply a different rate because your cost of capital, hold period or tax position differs, or because you assume rental growth the market has not priced. The valuer certifies the market number; your feasibility works out yours. When the two diverge sharply, it usually means either the market is pricing in something your model misses, or you have found a genuine mispricing worth acting on.

How do these values flow through a feasibility?

Each of the three values enters a development feasibility at a different point, and keeping them in their right place is what stops a model from quietly lying to you.

Market value sets the land cost line, because in an arm’s length deal your purchase price is the market’s number, and it also sets the dutiable value that drives the duty cost line. Investment value is not a line in the model at all; it is the output, the maximum land price your residual can justify at your target margin, which you compare against the asking price before you commit. On-completion value, the market’s view of the finished product, sets the gross realisation value the whole feasibility hangs on and caps the construction funding the bank will advance. Fair value only appears later, and only if you hold rather than sell, when the completed asset is measured on the balance sheet.

Getting these in the wrong slots produces predictable errors. Plugging your optimistic investment value in as the land cost inflates the deal until it looks unaffordable. Treating your own gross realisation value as the bank’s on-completion valuation overstates your borrowing capacity and leaves an equity gap late in the project. A feasibility model earns its keep by keeping market value on the cost side, investment value as the test the deal has to pass, and the bank’s on-completion value as the funding constraint.

Common mistakes developers make with these three values

The recurring errors nearly all come from swapping one basis for another. Watch for these:

• Paying your investment value in a hot market. If your investment value is above market value, that headroom is your margin, not the vendor’s. Bidding all the way up to your own ceiling hands the entire upside to the seller and leaves you carrying the risk for a market return.
• Treating the Valuer-General’s figure as market value. The statutory land value is a legislated, land-only number for rating and land tax. It is not an appraisal of your site’s development value and should never anchor a purchase decision.
• Confusing accounting fair value with a sale price. A fair value in the accounts is a measurement at a point in time on market assumptions. It is not a signed contract, and a buyer under real conditions may pay more or less.
• Assuming the bank’s on-completion valuation equals your gross realisation value. Valuers assess on-completion value conservatively and on settled evidence, often below a developer’s own sales expectation, so funding modelled on the developer’s number rather than the valuer’s likely figure overstates borrowing capacity.
• Ignoring that “fair value” has three meanings. Before you rely on a number called “fair”, check whether it means the AASB 13 accounting basis, equitable value between named parties under the standards, or just loose talk for market value.

Getting the vocabulary right is not pedantry. A site’s market value, your investment value, the bank’s on-completion value and an accounting fair value can all differ at the same moment, each correctly, because each answers a different question. The developers who consistently do well are the ones who know which question they are asking before they reach for a number.

Quick answers for property developers

Is fair value the same as market value?

For most real property, effectively yes. Accounting fair value under Australian Accounting Standard AASB 13 is a market-based exit price, and for property it is generally consistent with the International Valuation Standards concept of market value, so a valuer and an accountant usually land on the same figure. The catch is the word “fair” has a second meaning in valuation, where the International Valuation Standards use “equitable value” for a price between two identified parties, which can differ from open-market value. Check which “fair” is meant before relying on it.

Can a development site be worth more than its market value?

Yes, to a specific buyer. Market value is the impersonal open-market price, but a particular developer’s investment value can sit above it because of a lower cost of capital, a cheaper build, a better tax position, or synergies with adjoining land they already own. That headroom above market value is the developer’s potential margin. Paying the full amount across to the vendor gives the upside away.

Does the bank lend against market value or my purchase price?

Against market value, and generally the lower of the two if your price is higher. Lenders rely on an independent valuation from an Australian Property Institute member, using “as is” market value for the land facility and “on completion” market value for the construction facility. If you pay above the valuer’s market value because your investment value is higher, the extra usually has to come from your own equity, because the loan is sized off the valuation, not your contract price.

This guide is general information for property developers and is not valuation, tax, financial or legal advice. Valuation bases, statutory definitions, tax rules and thresholds change, and every site sits in its own context, so confirm the current position with a qualified valuer, your accountant, and the relevant revenue office or planning authority before you rely on it for a deal.