Business Valuation for CGT Purposes in Australia: A Complete Guide for SME Owners (2026)

Introduction

Capital gains tax (CGT) is one of the most significant tax implications of selling, transferring, or restructuring an Australian business. Getting the valuation right — and understanding how the proposed CGT reform affects you — can mean the difference between a well-planned exit and an unexpected tax bill.

This guide explains how business valuation interacts with CGT in Australia, the proposed changes to the 50% discount, the small business concessions, and what you need to prepare for ATO compliance.

How CGT Applies to Business Assets

In Australia, CGT applies when a CGT event occurs — most commonly, the sale or disposal of an asset acquired after 20 September 1985 (when CGT was introduced). For business owners, common CGT events include:

• Selling the business — disposal of business assets, goodwill, or shares in the business entity
• Transferring assets to a related entity — moving a business from a sole trader structure to a company or trust
• Retirement or succession — transferring the business to family members or a new generation
• Restructuring — changes to trust or company structures that trigger a deemed disposal
• Compulsory acquisition — government acquisition of business property

The capital gain is calculated as:

Capital Gain = Capital Proceeds − Cost Base

The cost base includes the original purchase price plus incidental costs of acquisition and holding costs (stamp duty, legal fees, improvements).

The 50% CGT Discount (Current Law)

If the asset was held for at least 12 months, an individual taxpayer can reduce the capital gain by 50% before including it in assessable income. For superannuation funds, the discount is 33.33%. Companies do not qualify for the discount.

Example: A business purchased for $500,000 and sold 5 years later for $2,000,000:

• Capital gain: $1,500,000
• 50% discount applies: $750,000 included in income
• At top marginal rate (45% + 2% Medicare levy): tax payable ~$352,500

Without the 50% discount, the full $1,500,000 would be included — a tax liability of approximately $705,000.

The Proposed CGT Reform: Scrapping the 50% Discount for Indexation

The Australian Government has proposed replacing the flat 50% CGT discount with an indexation-based system. Under this model, the cost base of the asset would be adjusted for inflation (using CPI) rather than giving a flat 50% reduction on the gain. This brings the system back toward the pre-1999 CGT regime, which also used indexation before the discount was introduced.

How indexation would work

The indexed cost base is calculated by multiplying the original cost base by the CPI movement over the holding period:

Indexed Cost Base = Original Cost Base × (CPI at disposal ÷ CPI at acquisition)

The capital gain then becomes: Capital Proceeds − Indexed Cost Base

For a detailed walkthrough of how to model these calculations in a financial model, see ExcelWiz's guide to financial modelling techniques.

How this compares to the 50% discount

The key difference: the 50% discount benefits every qualifying sale equally (a flat 50% reduction), while indexation benefits depend on how long the asset was held and how much inflation occurred during that period.

Comparison by holding period:

(Assumes asset acquired at cost of $500,000, sold at $2,000,000. Indexation benefit converges with the 50% discount after approximately 25-30 years at 3% CPI.)

The practical takeaway: for the typical SME holding period of 5-15 years, indexation produces a significantly worse outcome than the current 50% discount. A business held for 5 years would have 86% of the gain included under indexation versus 50% under the current regime — a 72% increase in assessable gain.

Impact on business valuation engagements

This reform changes the valuation conversation in several ways:

1. After-tax modelling becomes essential — A valuation that reports only the pre-tax business value is incomplete. Clients need to understand the tax impact under both the current and proposed regimes to make informed decisions about timing and structure.

2. Holding period analysis — The decision of when to sell becomes more consequential. If indexation is enacted, there is a strong incentive to complete transactions while the current 50% discount still applies.

3. Cost base records — Indexation requires accurate records of the original cost base and all capital improvements. Poor record-keeping — common among long-held family businesses — will inflate the tax liability.

4. Transitional rules — Assets acquired before the change date may be grandfathered under the old 50% discount rules. Valuation reports should clearly identify which assets fall under which regime.

Small Business CGT Concessions

Even without the 50% discount, the small business CGT concessions remain a powerful tool for reducing CGT on business assets. To qualify, your business must satisfy the $6 million net asset value test or the $2 million aggregated turnover test.

The $6 million net asset value test

This is where business valuation becomes essential. The test requires that the net asset value of:

• The business entity
• Any connected entities (related companies, trusts, partnerships)
• Any affiliates (spouse, children under 18, entities controlled by them)

...does not exceed $6 million immediately before the CGT event.

Net asset value is calculated as the market value of all assets (CGT and non-CGT) minus all liabilities. This means even non-business assets — the family home (if held in a related entity), investment properties, shares — are included.

Getting this wrong is expensive. If you proceed on the basis that you qualify for the concessions, but a valuation shows net assets above $6 million, the concession is lost and you face the full CGT liability.

The four small business concessions

If you pass the net asset value test or turnover test, you may access:

1. 15-year exemption — For businesses held for 15+ years by individuals aged 55+: full exemption from CGT on the business assets. The asset must be an active asset for the entire 15-year period.

2. 50% active asset reduction — A 50% reduction of the capital gain on active business assets. This stacks with the general 50% CGT discount for individuals (meaning a total reduction of 75%).

3. Retirement exemption — Up to $500,000 (lifetime cap) of capital gains can be disregarded if the proceeds go into a complying superannuation fund. Available from age 55 or on permanent retirement.

4. Rollover — Defer the CGT liability if the proceeds are reinvested in another active asset.

Interaction with the proposed indexation reform

If the 50% CGT discount is replaced with indexation, the small business concessions become even more important. The 50% active asset reduction (concession 2) does not depend on the general CGT discount — it applies to the capital gain before any discount. So eligibility for the small business concessions becomes the primary line of defence against a higher CGT bill under the new regime.

The Valuation Process for CGT Purposes

Step 1: Determine the effective date

The valuation must be as at the date of the CGT event — the date the contract was entered into, the date of transfer, or the date of the relevant trigger. A valuation dated 6 or 12 months earlier is not sufficient.

Step 2: Identify all relevant assets

For a business valuation, this includes:

• Tangible assets — plant, equipment, vehicles, stock, property
• Intangible assets — goodwill, intellectual property, licences, customer contracts, brand value
• Financial assets — cash, receivables, investments

Each class of asset must be identified and valued separately for CGT purposes because different cost bases and tax treatments may apply.

Step 3: Select the appropriate valuation methodology

For CGT purposes, the ATO expects the valuation to reflect market value — the price a willing but not anxious buyer would pay a willing but not anxious seller, both acting at arm's length in an open market.

The appropriate method depends on the nature of the business:

• Capitalisation of earnings — standard for established SMEs
• Discounted cash flow — for growth businesses with variable earnings
• Asset-based — for asset-heavy or investment businesses
• Market multiple — where comparable transaction data is available

Step 4: Document thoroughly

A CGT-compliant valuation report should include:

• The purpose of the valuation and the relevant CGT provisions
• The effective date
• The methodology selected and the rationale for choosing it
• All assumptions made, including revenue projections, growth rates, and discount rates
• The source of financial and market data
• Any restrictions or qualifications
• The valuer's qualifications and independence

The ATO's Valuation Guidelines outline the documentation standards expected. A professionally prepared report that follows these standards is far less likely to be challenged.

Common Valuation Mistakes in CGT Contexts

Under-valuing goodwill

The most common error in business valuations for CGT is treating goodwill as minimal or nominal. The ATO is particularly alert to this in related-party transactions — transferring a profitable business to a family trust or company with a low or nil goodwill value is a well-known CGT avoidance pattern.

Ignoring related entities

The $6 million net asset value test requires aggregating assets across connected entities and affiliates. Failing to identify all related entities can lead to incorrectly claiming the small business concessions, which the ATO will discover on review.

Using the wrong valuation date

Using a valuation prepared for a different purpose (e.g., a strategic planning valuation from 6 months ago) for a CGT event is a common error. Market conditions, business performance, and asset values change. The valuation must be specific to the CGT event date.

Not considering both regimes

With the proposed CGT reform making its way through the legislative process, a valuation that only models the tax outcome under current law is incomplete. Clients need to understand both scenarios to make informed decisions about transaction timing and structure.

Conclusion

The interaction between business valuation and capital gains tax is complex, and the proposed CGT discount reform makes it more so. Getting the valuation right means:

1. Using the correct effective date and methodology
2. Properly identifying all relevant business assets and related entities
3. Accurately documenting the valuation for ATO compliance
4. Modelling the tax outcome under both current and proposed rules
5. Engaging a qualified independent valuer with CGT experience

If you are planning a business sale, restructure, or succession, start the valuation process early — ideally before you finalise the transaction structure. The cost of a professional valuation is a fraction of the potential tax liability from getting it wrong.

This guide provides general information only and does not constitute tax or valuation advice. Tax outcomes depend on individual circumstances, and the CGT reform proposals have not yet been legislated. For advice tailored to your situation, engage a qualified tax advisor and business valuation professional.

Related reading: Complete Guide to Business Valuation in Australia, Business Valuation Methods, Discount Rates for SME Valuations, Business Valuation Cost in Australia 2026, and Business Valuation for CGT and Estate Planning.