Home-Based Business and CGT Concessions: What the ATO's 2026 Guidance Means for Sellers

The assumption that costs sellers

Here's a scenario that plays out regularly: a tradesperson, consultant, or professional services owner has run their business from home for 15 years. They've claimed a portion of mortgage interest, rates, and utilities as business deductions. They've got a home office — maybe a workshop or storage. When they start thinking about exiting, their plan includes selling the home as part of the wind-down and applying the small business CGT concessions to reduce the capital gain.

Updated ATO guidance released in early 2026 is a direct challenge to that plan. The ATO has clarified its position: simply using part of your home for business, or claiming home occupancy deductions, is generally not enough to make the property an "active asset" for the purposes of the small business CGT concessions.

What the active asset test actually requires

To access the small business CGT concessions, the asset being sold must pass the active asset test. For a property, this means it must have been used, or held ready for use, in carrying on a business — and the business use must be genuine, not incidental.

The ATO's updated position is clear: having a home office, or even being able to deduct home occupancy expenses, does not automatically make your home an active asset. If the property's primary character is residential, and business use is a secondary or incidental function, the active asset test is generally not met.

This matters because the small business CGT concessions are powerful. They include:

• 15-year exemption: Full exemption from CGT on assets owned for 15+ years (if you're over 55 and retiring)
• 50% active asset reduction: Reduces a capital gain by 50% after applying the general CGT discount
• Retirement exemption: Excludes up to $500,000 of capital gains (lifetime limit) — can be contributed to super
• Rollover: Defer a capital gain by rolling it into a replacement asset

If your property doesn't pass the active asset test, none of these apply to the gain on its sale.

The double hit: losing the main residence exemption too

There's a compounding problem here that many owners don't anticipate. If you've claimed home occupancy costs as business deductions (mortgage interest, council rates, insurance), you've already partially forfeited your main residence CGT exemption for the periods you claimed those deductions.

So you may be in a position where:

• You can't access the small business CGT concessions (property doesn't meet active asset test), and
• You can't access the full main residence exemption (because you claimed business deductions)

The result: you pay CGT on a meaningful proportion of the gain on the sale of your home, with fewer offsets than you expected.

When does a home-based business property qualify?

The ATO's position isn't absolute. If the property was genuinely used as a place of business — not just incidentally — there is a case for active asset status. Think of a professional who converted a dedicated wing of their home into a consulting clinic, or a manufacturer who built a purpose-built workshop on their residential block that accounts for the majority of operational activity.

The key factors the ATO will consider:

• What proportion of the property was used for business vs residential purposes
• Whether the business use was primary or incidental
• The nature of the business activities conducted at the property
• Whether clients, employees, or operations were genuinely based there
• How the property was represented (residential, commercial, mixed-use)

In most family business situations — a home office used for admin, a spare room for stock — the ATO's view is that this is incidental use. The active asset test is not met.

What this means if you're planning your exit

If you run your business from home and are thinking about selling in the next few years, there are a few things worth reviewing now:

1. Get clarity on what you're actually selling

The small business CGT concessions apply to business assets — goodwill, plant and equipment, client relationships. They don't automatically extend to the property that houses the business. Separating the sale of the business from the sale of the property, and understanding the tax treatment of each, is important groundwork.

2. Review your deduction history

If you've been claiming home occupancy deductions, you've already affected your main residence CGT position. An accountant can model what this means for your net position on a sale and help you understand the trade-offs going forward.

3. Don't assume — get advice early

The ATO's guidance is a reminder that tax planning done at the point of sale is too late. The structure of how you've operated, what you've claimed, and how your property has been used over time all determine your tax outcome. That history can't be rewritten at settlement.

Sellers who get specialist tax advice 12–24 months before they exit have time to restructure, manage the timing of deductions, and position the transaction for the best available outcome. Those who wait until they have a buyer in hand are working with whatever structure they've got.

The broader picture for family business owners

The ATO's 2026 guidance is part of a pattern of increased scrutiny on small business CGT claims. The same guidance clarified that AML/CTF obligations will extend to some small businesses from July 2026, and the Director Penalty Notice regime has seen a 136% surge in notices. The compliance environment for business owners is tightening.

For succession planning purposes, this means one thing: the assumptions you've carried about your exit tax position — especially around CGT concessions on the property — need to be tested against current ATO guidance before you rely on them.

Frequently asked questions