Main Residence 6-Year CGT Rule Australia 2026: The Absence Rule Explained
The ATO's 6-year rule (formally the Main Residence Absence Rule) is one of the most valuable and misunderstood tax provisions in the Australian property system. It allows homeowners to rent out their former principal place of residence for up to 6 years while continuing to treat it as their main residence for capital gains tax purposes, meaning the property can be sold CGT-free despite being income-producing.
This guide covers how the 6-year rule works in 2026, the elections and records required, worked examples for common scenarios, and the traps that commonly cost investors hundreds of thousands of dollars when mishandled.
What the 6-Year Rule Actually Does
When you sell your principal place of residence (PPOR), the capital gain is generally fully exempt from CGT. This is the main residence exemption under Section 118-110 of the ITAA 1997.
The 6-year rule, set out in Section 118-145, extends this exemption to a PPOR that has been rented out, provided:
- You lived in the property first as your main residence
- You make (or are deemed to make) an election to continue treating it as your main residence
- The rental period does not exceed 6 years
The effect: you can move out, rent the property, and sell it up to 6 years later fully CGT-free, even though the property was generating assessable rental income the entire time.
Why This Is So Valuable
Consider a property that was your PPOR, purchased for $600,000 and worth $950,000 after 6 years of rental. The capital gain is $350,000.
Without the 6-year rule:
- Part of the gain is apportioned to the rental period
- After 50% CGT discount, roughly $175,000 is taxable
- At the 37% marginal rate + Medicare: ~$66,500 tax
With the 6-year rule:
- Full exemption applies (treated as main residence throughout)
- CGT payable: $0
- Tax saved: $66,500
The rule can literally save you the full tax bill on a sale.
How the Rule Works: Mechanics
Step 1: Establish the Property as Your PPOR First
Before moving out, you must genuinely occupy the property as your main residence. "Genuinely" means:
- Your personal effects are in the property
- You receive mail there
- You are connected to utilities
- You are registered on the electoral roll at that address
- You have the habit of physically sleeping there
There is no statutory minimum period, but the ATO typically expects 3 to 12 months of occupancy before rental. Short stints followed by rental are vulnerable to challenge.
Step 2: Make the Election at Sale
The 6-year rule is activated by election at the time you lodge the tax return for the year of sale. You do not need to notify the ATO at the time of moving out, but you must make the election before settlement is finalised in the relevant tax year.
Step 3: Only One PPOR at a Time (With a 6-Month Overlap Concession)
Critically, you can only have one main residence at any given time for CGT purposes. If you buy a new home to live in while renting the old one, you face a choice:
- Treat the rented property as your main residence (6-year rule applies)
- Treat the new home as your main residence (6-year rule does NOT apply to the rented property)
You cannot do both simultaneously for the same period, except for a narrow ATO concession: if you are moving house, you can treat both your old and new home as your main residence for up to 6 months, provided your old home was your main residence for a continuous period of at least 3 months in the 12 months before disposal and was not used to produce income during any part of that period when it was not your main residence. For couples, each spouse can nominate a different property, but the exemption is then halved for each.
Step 4: The 6-Year Clock Restarts
If you return to live in the property before the 6-year mark, the clock resets. You can then move out again for up to another 6 years with a fresh exemption period.
This "reset" feature makes the rule extremely flexible for people with mobile careers or family changes.
Model CGT on Your Property Sale
PropBuyAI models capital gain, CGT, and the main residence 6-year rule for any scenario, so you can plan your sale timing and tax outcome in advance.
Start Free →Worked Example 1: Simple 6-Year Rule Application
- Sarah purchased her Sydney unit in 2018 for $750,000
- Lived in it as PPOR from 2018 to 2020
- Moved to Melbourne for work in 2020, rented the Sydney unit
- Sold the unit in 2026 for $1,100,000 (capital gain $350,000)
- Elected to treat the unit as her main residence throughout the rental period (less than 6 years elapsed)
Result: Full exemption. Zero CGT.
Sarah cannot also claim Melbourne rental property (or a purchased Melbourne home) as her PPOR during the same period if she wants to preserve the exemption on the Sydney unit.
Worked Example 2: Extending Past 6 Years
- Michael bought a Brisbane home in 2015 for $500,000
- Lived in it as PPOR from 2015 to 2018
- Moved overseas for work in 2018, rented the Brisbane home
- Sold in 2026 for $900,000 (capital gain $400,000)
- Rental period: 2018 to 2026 = 8 years (exceeds the 6-year cap)
Result: Partial exemption. The first 6 years of the rental period are exempt; the final 2 years are not.
CGT calculation:
- Ownership period: 11 years (2015-2026)
- Non-exempt period: 2 years
- Apportioned gain: $400,000 × (2/11) = $72,727
- 50% CGT discount: $36,364 taxable
- Tax at 37% marginal: ~$13,450
Michael should have sold by 2024 (6 years after moving out) to preserve full exemption.
Worked Example 3: Absence Rule Reset
- Emma bought a Perth home in 2010 for $400,000
- Lived in it until 2014, then moved to Melbourne and rented it
- Returned to Perth in 2019, lived there 2 years, moved out again in 2021
- Sold in 2026 for $850,000 (gain $450,000)
Result: The absence periods are 2014-2019 (5 years, under cap) and 2021-2026 (5 years, under cap). Each is within 6 years, and the return resets the clock. Full exemption applies.
Common Mistakes That Cost Investors
1. Not Actually Living in the Property First
Buying a property, never moving in, and claiming the 6-year rule is not valid. The rule requires genuine prior occupation.
2. Double-Dipping on PPOR Exemptions
You cannot have a Melbourne house as your PPOR for exemption and also treat the rented Sydney unit as your PPOR. Choose one.
3. Exceeding the 6-Year Cap
Rental periods over 6 years partially lose the exemption. Mark the date you moved out in your records and set a reminder.
4. Failing to Document
The ATO can audit main residence claims years later. Keep utility bills, electoral roll registrations, mail receipts, and tenancy agreements as supporting evidence.
5. Ignoring the Cost Base Reset Election
If your circumstances change (e.g. you decide to treat the property as not your main residence), you can elect a cost base reset at the date you moved out. This uses the market value at move-out date as the new cost base. Failing to elect this when beneficial leaves tax on the table.
The 6-Year Rule and Foreign Residency
Significant changes to main residence exemption for foreign residents apply. If you are a foreign resident at the time of sale:
- You generally cannot access the main residence exemption, even if you lived in the property as PPOR
- Narrow exceptions apply for certain life events (death, terminal illness) within 6 years of becoming foreign resident
- The 6-year absence rule interaction is complex for expats
Australian expats who move overseas and later sell a former PPOR should carefully review residency status at time of sale. Becoming an Australian resident again before selling (even briefly) can restore the exemption.
Interaction With Other Rules
Depreciation: If you claimed depreciation on the rental property, the building component may be subject to cost base adjustment on sale. This can erode part of the exemption benefit.
Capital improvements: Renovations during the rental period form part of the cost base and benefit from the exemption if the 6-year rule applies.
Partial use: If the property was used for income production (e.g. home office claim) while being your PPOR, the exemption is apportioned.
Spouse rules: Married or de facto couples can only nominate one PPOR at a time. Nominating different properties halves the exemption for each.
For comprehensive CGT context, see our CGT on investment property guide.
Planning Strategies Using the 6-Year Rule
1. Buy, Live, Rent, Sell
Purchase a property, live in it 1-2 years, then relocate. You have 6 years to sell CGT-free. Repeat with next property.
2. Overseas Posting Strategy
Take an overseas work posting, rent your PPOR, return within 6 years for a tax-free sale or reset. Check residency rules carefully.
3. Multi-Property Owners
Use the 6-year rule to rotate which property is "the PPOR" for CGT purposes. Strategic timing of sales maximises overall exemption across the portfolio.
4. Renovation and Sale
Buy, live, renovate, rent during renovation completion, sell within 6 years of moving out. Renovations are included in the cost base; exemption covers the full gain.
CGT Discount Reform Interaction
If the 50% CGT discount is reduced in coming years (see our CGT discount reduction 2026 analysis), the value of the 6-year rule goes UP. Because it provides a full 100% exemption rather than a partial discount, a reduction in the 50% discount makes the main residence exemption relatively more valuable.
Investors who might previously have held as pure investment (50% discount, low CGT) may now find it worthwhile to live in a property first to unlock the full exemption.
Bottom Line
The main residence 6-year rule is one of the most powerful CGT planning tools in Australian tax law. Used correctly, it can save hundreds of thousands of dollars on the sale of a former home. Used poorly, or misunderstood, it creates unexpected tax bills and ATO disputes.
The key disciplines: genuinely occupy before renting, track the 6-year clock carefully, make the election at sale, and maintain documentary evidence. Use PropBuyAI to model CGT scenarios and the 6-year rule interaction on your specific property. Explore pricing.
Always consult a qualified tax adviser before making main residence elections, particularly for properties held over long periods or across international boundaries.