How do I estimate CGT on an AirBnB'd primary residence for 10 years

 Author: YellowPotato(Taxicorn)Taxicorn

23 Mar 2026

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Would my CGT be Total Gain * (Floor space%/100) * (Days rented /Days owned) * (years AirBnB'd/ years owned)?

• Unlikely, you added an extra step 4 & 5
• There's also the valuation of home when first used to produce income so the number of days owned could be different
• Use days not years
• https://www.ato.gov.au/individuals-and-families/investments-and-assets/capital-gains-tax/property-and-capital-gains-tax/your-main-residence-home/using-your-home-for-rental-or-business#ato-Workoutyourcapitalgainorloss
• https://www.ato.gov.au/individuals-and-families/investments-and-assets/capital-gains-tax/property-and-capital-gains-tax/your-main-residence-home/using-your-home-for-rental-or-business#ato-Valueofhomewhenfirstusedtoproduceincome

Would look more like: gain/loss x (rented out floor space%) x (total days available or rented on Air BnB)/(total days since purchase or total days since first on Air BnB)

• https://www.ato.gov.au/individuals-and-families/investments-and-assets/property-and-land/residential-rental-properties/rental-property-genuinely-available-for-rent
• Total days for since purchase or since first time on AirBnB will likely depend on your MRE availability from purchase of property till before the first day on AirBnB

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