Small Business 15-Year CGT Exemption in Australia: A 2026 Tax Agent Guide to Selling Your Business Tax-Free

Selling a business after a lifetime of work is one of the most significant financial events an Australian business owner will ever experience. The capital gain on the sale can be substantial — but for eligible small business owners, the 15-year CGT exemption can reduce that gain to zero. This is the most powerful of the four small business capital gains tax concessions available under Australian tax law, and getting it right requires careful planning with a registered tax agent well before the sale occurs.

Understanding the Small Business 15-Year CGT Exemption

The small business 15-year exemption is a capital gains tax concession that allows eligible taxpayers to completely disregard a capital gain when they dispose of an active business asset they have owned for at least 15 continuous years. Unlike the 50% CGT discount or the small business 50% active asset reduction, the 15-year exemption eliminates the entire gain — there is no partial reduction, and capital losses do not need to be applied against the gain before the exemption is used.

The exemption is available to individuals, partnerships, companies, and trusts, though the eligibility conditions differ slightly depending on the entity structure. A registered tax agent can assess which conditions apply to your specific situation and ensure the exemption is claimed correctly.

The Four Small Business CGT Concessions

• 15-Year Exemption: Disregards the entire capital gain. The most powerful concession, applied first if eligible.
• 50% Active Asset Reduction: Reduces the capital gain by 50% after applying the general 50% CGT discount where applicable.
• Retirement Exemption: Exempts up to $500,000 of capital gains over a lifetime, with amounts contributed to superannuation if the owner is under 55.
• Rollover Relief: Defers the capital gain if the proceeds are reinvested in a replacement active asset within two years.

The 15-year exemption is applied before all other concessions. If you qualify, you do not need to consider the others for that particular CGT event.

Key Eligibility Conditions You Must Satisfy

The 15-year exemption is not automatic — you must actively choose to apply it, and you must satisfy all of the following conditions. A tax agent will work through each condition methodically to confirm your eligibility before the sale is finalised.

Basic Conditions for Small Business CGT Concessions

• Aggregated turnover test: Your aggregated annual turnover (including connected entities and affiliates) must be less than $2 million, OR
• Maximum net asset value (NAV) test: The net value of CGT assets owned by you, your affiliates, and connected entities must not exceed $6 million at the time of the CGT event. The $6 million NAV test is the more commonly used threshold for business sales involving significant assets.
• Active asset test: The asset being sold must be an active asset — meaning it must have been used or held ready for use in a business carried on by you or a connected entity for at least half of the ownership period (or 7.5 years if owned for more than 15 years).

Additional Conditions Specific to the 15-Year Exemption

• Continuous ownership: You must have continuously owned the CGT asset for at least 15 years immediately before the CGT event. Gaps in ownership — even brief ones — can disqualify the exemption.
• Age and retirement: You (or a significant individual in the case of a company or trust) must be aged 55 or older and the CGT event must occur in connection with your retirement, OR you must be permanently incapacitated regardless of age.
• Significant individual test: For companies and trusts, there must have been a significant individual — a person with at least a 20% stake — for a total of at least 15 years during the ownership period. This does not need to be the same individual throughout.

Common Mistakes That Cost Business Owners the Exemption

The 15-year exemption is extraordinarily valuable, but it is also easy to inadvertently disqualify yourself if you have not planned ahead. Tax agents regularly encounter the following mistakes.

• Failing the continuous ownership test: If you restructured your business — for example, transferring assets from a sole trader structure to a company or trust — the ownership clock may have reset. Restructuring events that occurred more than 15 years ago are generally safe, but more recent changes require careful analysis.
• Exceeding the $6 million NAV test: The net asset value test includes assets held by your spouse, affiliates, and connected entities. Business owners who have accumulated significant personal assets — including the family home in some circumstances — may inadvertently exceed the threshold.
• Not connecting the sale to retirement: The exemption requires the CGT event to occur "in connection with" your retirement. This does not mean you must retire immediately, but there must be a genuine connection. Selling a business and immediately starting a new one in the same industry may not satisfy this requirement.
• Missing the superannuation contribution window: Amounts disregarded under the 15-year exemption can be contributed to superannuation under the CGT cap, but the contribution must be made within 30 days of receiving the sale proceeds (or such longer period as the ATO allows). Missing this window means losing the ability to shelter the proceeds from tax inside superannuation.
• Applying concessions in the wrong order: The 15-year exemption must be applied before other concessions. Applying the 50% active asset reduction first and then attempting to apply the 15-year exemption is incorrect and may result in an ATO audit.

Australian Regulatory Context

The small business CGT concessions are contained in Division 152 of the Income Tax Assessment Act 1997 (ITAA 1997). The Australian Taxation Office (ATO) administers these concessions and publishes detailed guidance, including Tax Ruling TR 2007/2 on the active asset test and various practice statements on the application of the basic conditions.

The ATO has signalled increased scrutiny of small business CGT concession claims in recent years, particularly where the $6 million NAV test is close to the threshold or where the connection to retirement is not clearly documented. Registered tax agents are required to exercise reasonable care when preparing claims and must be satisfied that the eligibility conditions are genuinely met.

It is also important to note that while the federal government announced reforms to the general 50% CGT discount — scheduled to be replaced by an inflation-based discount from 1 July 2027 — these changes do not affect the small business CGT concessions, which remain available under their existing framework. However, the interaction between the new discount rules and the concessions will require careful analysis for sales occurring after 1 July 2027.

Tax agents must be registered with the Tax Practitioners Board (TPB) and are subject to the Code of Professional Conduct under the Tax Agent Services Act 2009 (TASA). When engaging a tax agent to advise on a business sale, confirm their TPB registration and experience with small business CGT concessions specifically.

The Superannuation Contribution Opportunity

One of the most powerful features of the 15-year exemption is the ability to contribute the exempt amount to superannuation under the CGT cap, which is separate from and in addition to the standard concessional and non-concessional contribution caps.

For the 2025–26 income year, the lifetime CGT cap is $1,780,000. This means a business owner who qualifies for the 15-year exemption can potentially contribute up to $1,780,000 of sale proceeds into superannuation — sheltering those funds from future income tax on earnings and from capital gains tax on future investment growth within the fund.

To access this benefit, you must complete a CGT cap election form and provide it to your superannuation fund at or before the time of the contribution. A tax agent can prepare this form and ensure the contribution is structured correctly to maximise the tax benefit.

Questions to Ask Your Tax Agent

When engaging a registered tax agent to advise on a potential business sale and the 15-year CGT exemption, the following questions will help ensure you receive comprehensive advice.

• Do I satisfy the basic conditions for small business CGT concessions, including the $6 million NAV test?
• Does my ownership history satisfy the 15-year continuous ownership requirement, including any restructuring events?
• Is the asset I am selling an active asset, and how is the active asset test applied to my specific structure?
• Does the sale occur in connection with my retirement in a way that satisfies the ATO's requirements?
• How much can I contribute to superannuation under the CGT cap, and what is the process for making that contribution?
• Are there any other concessions I should consider if I do not qualify for the 15-year exemption?
• What documentation should I maintain to support the exemption claim in the event of an ATO review?

How MyMoney® Can Help

The small business 15-year CGT exemption is one of the most valuable tax concessions available to Australian business owners, but it requires expert guidance to claim correctly. The eligibility conditions are complex, the documentation requirements are strict, and the consequences of getting it wrong — including ATO audits and unexpected tax bills — can be severe.

MyMoney® connects Australian business owners with registered tax agents who specialise in small business CGT concessions, business sales, and retirement tax planning. Our platform allows you to describe your situation and receive tailored proposals from experienced professionals who understand the nuances of Division 152 and the ATO's current compliance focus.

Do not leave the most significant financial event of your business life to chance. Post a Brief to connect with specialist tax agents, or Browse Tax Agents on the MyMoney® Marketplace to find a qualified professional who can help you maximise your retirement outcome.