Move out of a home you own, rent it out instead of selling, and the question that decides your tax bill years later is this: did the property stop being your main residence the day you left, or does the exemption keep running? The 6-year rule is what keeps it running. For capital gains tax purposes, you can treat a former home as your main residence for up to six years while it earns rent, and indefinitely if it doesn't.
The outline is simple. The details decide how much tax you actually pay: a room rented a year too early, a sale signed while you're living overseas, a cost base nobody wrote down. Here is how the rule works, the conditions attached to it, and what happens when you go past the limit.
What the main residence exemption covers
The 6-year rule extends the main residence exemption, so start with what that exemption requires. Your home escapes capital gains tax (CGT) when you sell if it meets the main residence exemption conditions. There must be a dwelling on the property and you must have lived in it. The land can be no more than 2 hectares. And the property must not have been used to produce income, which rules out running a business from it, renting it out, or buying it to renovate and sell at a profit.
Meet the conditions and you pay no tax on any capital gain when you sell. Fall short of one and you may still be entitled to a partial exemption, with the exempt proportion worked out using the ATO's CGT property exemption tool.
Two boundaries sit around the exemption. You get no exemption for a vacant block. And if you subdivide and sell land that used to be part of your home, you need to consider whether the profit is treated as a capital gain or as income.
The 6-year rule in plain terms
Usually a property stops being your main residence when you stop living in it. The rule that covers absences is the exception. For CGT purposes you can keep treating a former home as your main residence for up to six years if you use it to produce income, such as rent, which is where the name comes from. If you don't rent it out, the exemption continues indefinitely.
While that treatment applies, the property stays fully exempt, the same as if you were still living in it, even after tenants move in. The six years count the absence itself, and a period of absence stops when you stop renting the home and move back in. Sell while the property is still covered, and it's exempt just as if you had never left.
Each absence gets its own six years
The 6-year period applies to each period of absence. Move out and rent for four years, move back in, then move out and rent again, and the second absence opens a fresh six-year window.
You also choose how much of an absence the exemption covers. If you rented the property for five years, you can choose to treat it as your main residence for three of them. You decide when the period your choice covers comes to an end.
The details that catch people out
Renting part of it before you leave. If you use any part of your home to produce income before you stop living in it, the continuing exemption can't apply to that part. You can't get the main residence exemption for that part either before or after you move out. A spare room rented while you still live there takes that slice of the property out of the exemption for good.
Selling while a foreign resident. If you're a foreign resident when the CGT event happens, for example when you sell, you generally aren't entitled to claim the main residence exemption. And if you weren't an Australian tax resident during the time you were living in the property, you're unlikely to satisfy the requirements at all. For anyone who has moved overseas and kept a former home in Australia tenanted, this is the first thing to check.
Reporting runs on the contract date. You must report the capital gain, loss or exemption in the same year as the date you signed the sale contract, not the settlement date. A contract signed in June puts the gain in the financial year that is just ending, even if settlement lands in August.
What happens when you go past six years
The exemption doesn't vanish at the six-year mark. It stops covering the absence, and two calculations decide the rest.
The cost base resets. Under the home first used to produce income rule, your cost base becomes the market value of the home at the time you first used it to produce income, plus any allowable costs since then. The price you originally paid drops out of the calculation.
The gain is apportioned by time. Your capital gain or loss is based on the portion of time after the property was first used to produce income, over the 6-year limit.
The ATO's own worked example follows an owner, Roya, through the arithmetic. She sells her former home for $555,000 against a cost base of $235,000, giving a capital gain of $320,000. Of the 9,133 days in her ownership period, 6,940 count as non-main-residence days. The assessable capital gain is $320,000 × (6,940 ÷ 9,133) = $243,162. The 50% CGT discount then halves it, leaving a net capital gain of $121,581 to report on her 2025 tax return.
Two things sit in those numbers. Going past the limit didn't make the whole gain taxable, only the share of time the exemption didn't cover. And the 50% CGT discount still applied to the assessable part.
The dates worth writing down
The rule turns on dates, and keeping them is your job:
- The day you moved out, and the day the property first earned income. If you ever go past six years, your cost base is fixed at that first income date.
- Every move-back date. Each absence gets its own six-year period, and an absence stops when you move back in.
- The contract date when you sell, because the gain is reported against the year you signed, not the year you settled.
If you can see yourself drifting past six years, it's worth pinning down the market value at the point the property first earns rent, because that figure becomes your cost base. A number fixed at the time is a stronger position than an estimate reconstructed years later.
Where PropSpotter fits
Most people meet this rule at a crossroads: a home they're moving out of, a decision about renting versus selling, and usually a next property to buy. The purchase is the part PropSpotter works on. The whole system costs a fixed $4,990, with no commissions, no percentage of the purchase price and no hidden fees. It combines suburb research built from 30+ data sources, an automated listing system that monitors your target suburbs 24/7, and coaching in a dedicated WhatsApp group from sourcing through to settlement. It does the work with you rather than for you: every decision stays yours, because the point is to build genuine capability as an investor rather than a dependency on someone else. The research and sourcing cover all Australian states, so the same process applies whether you're in Sydney looking at Brisbane or in Melbourne exploring Perth.
If you want to talk through how the 6-year rule applies to your specific situation, or how it factors into your next purchase, you can read our full guide to selling without losing your profit to tax or book a free strategy session.