Property Valuation Services for CGT: How They Work When You Turn Your Home Into a Rental

You’ve moved out, the house is heading to the rental market, and someone has mentioned you’ll need a valuation “for the tax people”. It’s fair to be puzzled. You haven’t sold anything, so why does the ATO care what the place is worth?

The day your home first earns rent, the tax rules can reset the starting point for your capital gains tax (CGT) calculation to its market value on that date. Understanding CGT and tax-related property assessments can help you prepare the right evidence before your property becomes income-producing. Property valuation services are how you get that number in a form that holds up if anyone asks questions. Below, we cover how the rule works, where the six-year rule fits, what a valuer actually does, and why the 1 July 2027 CGT changes add a second date to think about.

Summary

• While you live in your home it’s generally CGT-exempt. Once you rent it out, you can lose that exemption unless you choose to keep treating it as your main residence, which you can do for up to six years.
• If you bought after 19 September 1985, lived in the home first, and it first earned income after 20 August 1996, your cost base is automatically reset to the market value on the day it first earned income. It isn’t what you paid.
• The ATO says you need a market valuation from when you first start renting. It matters most if you sell after the six years are up, or if your plans or circumstances change.
• A CGT valuation is tied to a specific past date and built on comparable sales evidence. Agent appraisals and online estimates aren’t designed for that job.
• From 1 July 2027 the CGT discount is replaced by indexation, and assets held on 30 June 2027 are treated as sold and reacquired at market value. A rental you still own may need a second valuation date.
• Note your key dates, gather your records, get the valuation while the evidence is fresh, and tell your accountant.

How Property Valuation Services Fit Into CGT When Your Home Becomes a Rental

While you live in your home, the main residence exemption means you generally pay no CGT when you sell. Once you rent it out you’re using it to produce assessable income, and you may only be entitled to a partial exemption. 

CGT is a federal tax, so these rules are the same in every state. Land tax and other state-based rules can change when a home becomes a rental, though, so check that side with your state revenue office.

The “home first used to produce income” rule

This is the bit that catches people out. The rule applies if you acquired the dwelling on or after 20 September 1985, first used it to produce income after 20 August 1996, and would get only a partial exemption on sale (but a full one if you’d sold just before it first earned income). If all of that fits, the law treats you as having bought the home on the day it first earned income, at its market value that day.

Some plain-English basics:

• Cost base is roughly what the property cost you, plus things like stamp duty, legal fees and capital improvements.
• Capital gain is what you sell for, minus your cost base.
• The rule is automatic. If you meet the criteria, you don’t get to choose whether it applies. 

That’s why the ATO says you must get a market valuation of your home when you first start using it for rental or business, if that was after 20 August 1996. It isn’t only whole-house rentals. Renting out part of your home, including through the sharing economy, can also count. 

Which date does the valuer value?

Usually it’s the date the property first earned rent or was genuinely available for rent. Your accountant can confirm which date applies to you. Either way it’s a past date, so what you need is a retrospective valuation.

The Six-Year Rule: Do You Still Need a Valuation?

The six-year main residence rule lets you choose to keep treating your former home as your main residence after you move out, even while it’s rented. The maximum is six years. You generally need to have lived in the home first, and you can usually only nominate one main residence at a time (with a short overlap when you’re moving). If you move back in and out again, the six years can start afresh. 

If you choose the rule and sell within the six years, there’s typically no CGT, so the valuation doesn’t change your tax bill. So why bother? A few reasons:

• Plans change. Tenants are good, the market’s soft, and suddenly you’re at year seven.
• The gain after the six years is worked out from the market-value cost base. Your gain is based on the portion of time over the six-year limit. 
• Evidence is easiest to gather at the time. Five years later, finding sales data and records for a specific date is harder.
• Foreign residents need extra care. If you’re a foreign resident when you sell, you generally aren’t entitled to the main residence exemption. Anyone renting out their home while working overseas should get advice before leaving. 

A Worked Example (Illustrative Only)

This scenario is hypothetical, and we’ve ignored purchase and selling costs to keep it simple.

Jess buys a house in Wynnum, Brisbane, for $600,000 on 1 January 2015 and lives in it. On 1 January 2018 she moves to Melbourne for work and rents it out. A valuer confirms it was worth $700,000 on that date. She sells on 1 January 2026 for $1,000,000.

• She rented it for eight years and chooses the six-year rule, which covers the first six (to 1 January 2024).
• Her cost base is $700,000, so her capital gain is $300,000.
• The last two of the eight years fall outside the rule, roughly a quarter of the period. About $75,000 of the gain is taxable before any CGT discount.

If her cost base had stayed at $600,000, the gain would be $400,000 and the taxable share about $100,000. The valuation takes $100,000 of growth from before the rental began out of the calculation. It’s also up to Jess to back that figure up.

Real calculations have more moving parts, including other cost base items, residency status and the discount. Treat this as a picture of how it works, not a calculation for your own property.

What a Qualified Valuer Actually Does for a CGT Valuation

A CGT valuation isn’t a quick drive-by opinion. A qualified valuer will generally:

1. Fix the valuation date and basis. Market value as at that specific date, meaning the price a willing buyer and seller, neither under pressure, would likely agree on.
2. Inspect the property and work out how it looked back then. If you’ve renovated the kitchen since the tenants moved in, that shouldn’t inflate a past value, so your records matter here.
3. Analyse comparable sales from around that date. For a house that’s usually direct comparison, adjusted for land size, condition, location and features. In a fast-moving market, sales a few months either side of the date can look very different.
4. Document the assumptions and evidence. The report is your audit trail.

For tax purposes, the acceptability of a valuation usually depends on the process behind it. A reasonable estimate of market value takes skill, knowledge and experience, and a suitably qualified professional following accepted industry standards is generally considered reliable. 

What to have ready

• Contract of sale and settlement statement
• The dates you moved out and first advertised or rented the property
• The first lease or a letter from your property manager
• Photos from around that time, including old listing photos
• Building and pest reports
• Dated receipts for renovations and improvements
• Council rates notices
• Any earlier valuations, such as a bank or insurance valuation

Retrospective valuations have limits

The further back the date and the thinner the evidence, the more a valuer has to rely on assumptions. A good one will say so plainly. That’s the best reason not to leave the job until sale day.

Choosing Property Valuation Services for a Tax Purpose

The ATO doesn’t require a specific licence for valuing your home for CGT, but it does expect a supportable estimate from someone with the right skills, following accepted standards. That rules out some common shortcuts:

Option	What it’s built for	Why it usually falls short for CGT
Agent appraisal	Helping you list or sell	Informal opinion, usually about today’s market, no formal method
Online estimate	Quick automated ballpark	No inspection, can’t reflect condition, hard to date-stamp
Bank valuation	A lender’s security assessment	Prepared for lending, not tax, and usually current rather than historical
Independent qualified valuation	A defined date and purpose	Built to be evidence-based and documented

When you’re comparing valuers, look for formal valuation qualifications or recognised professional membership. Reading about choosing the right valuation professional can help you understand what experience, independence and credentials to look for before appointing someone. 

The 1 July 2027 CGT Changes: A Second Valuation Date for Your Rental

The federal CGT reforms are now law. The Treasury Laws Amendment (Tax Reform No. 1) Act 2026 received Royal Assent on 26 June 2026. It replaces the 50% CGT discount with cost base indexation and a 30% minimum tax. The changes start on 1 July 2027 and apply to individuals, trusts and partnerships. The main residence exemption itself isn’t affected. 

For assets you hold across the changeover, they’re treated as sold just before 1 July 2027 and reacquired on 1 July 2027 at market value, or at an amount worked out under an apportioning method the Minister may prescribe. You don’t have to choose between the two until you lodge the return for the year you actually sell. The apportioning method was reported as still being finalised, so check the ATO’s current guidance before relying on it. Treasury had released it as an exposure draft with consultation to 21 August 2026. 

What does that mean for your rental? If you’ll still own the property on 30 June 2027 and it won’t be fully exempt, you could need a valuation at two dates. One is the date it first earned rent, which is in the past. The other is 30 June 2027, which is in the future. A valuation as at 30 June 2027 can only be done after that date, because a valuer needs actual sales evidence from around then. In the meantime, keep your records in order and ask your accountant how the transition works with the six-year rule for your property.

Common Mistakes When Turning a Home Into a Rental

• Assuming your purchase price stays your cost base. If the rule applies, it’s automatic.
• Leaving the valuation until you sell. Evidence gets harder to find, and memories fade.
• Getting a valuation as at today. A current value doesn’t tell you what the property was worth on the day it first earned rent.
• Assuming the six-year rule means no paperwork. It’s the plan changing that creates the problem.
• Overlooking exceptions. The rule doesn’t apply if you first used your home to produce income before 21 August 1996, or if you inherited it. Different rules apply, so ask your accountant. 

What to Do Before Your Home Goes on the Rental Market

1. Write down the date you moved out and the date the property first became available for rent.
2. Ask your accountant whether the “first used to produce income” rule applies and whether you’ll nominate under the six-year rule.
3. Book a valuation as at the date it first earned income. Property valuation services are easier to line up while the market evidence is recent.
4. Gather your purchase, renovation and rental records in one folder.
5. Keep the valuation report with your tax records well beyond the sale.
6. Diarise 30 June 2027 and ask your accountant what it means for your property.

FAQs

Do I need a valuation when I move out and rent my house?

If your home was your main residence from when you bought it and it first earns income after 20 August 1996, the ATO says you must get a market valuation at that point. You need that figure to calculate your gain or loss when you sell.

Can I use a real estate agent’s appraisal for CGT?

It’s risky. An appraisal is usually an opinion on today’s selling price, not a documented valuation as at a past date. A formal valuation gives you evidence and reasoning you can point to.

Does the valuer need to be a registered valuer?

The ATO generally looks at the process and the valuer’s skill and objectivity, rather than one particular registration. In practice, choose someone with formal qualifications and experience in your property type and location.

Can a valuer value my property as at a date years ago?

Yes, valuers do this regularly. How confident the result is depends on the evidence available for that date, including comparable sales and your records of the property’s condition.

I’ve been renting for years and never got a valuation. What now?

Get one as soon as practical and talk to your accountant. A retrospective valuation is still possible, but you can’t simply substitute your purchase price if the rule applies.

How much does a CGT property valuation cost?

Fees vary with the property type, location, complexity and how far back the date is. Ask for a written quote, and ask your accountant whether the fee is deductible in your situation.

Do the 2027 changes affect my main residence?

The main residence exemption itself isn’t changing. A former home that you’re renting and that isn’t fully exempt is different, so get advice on how the transition applies to it.

Conclusion

Turning your home into a rental doesn’t automatically create a tax problem, but it does start a clock and set a valuation date. Property valuation services give you a defensible market value for the day your home first earned rent, which protects your cost base and your CGT position. Get it while the evidence is fresh, and keep your records.

Need a Valuation as at the Date Your Home Became a Rental?

If you’re renting out your former home, Qualified Property Valuers can prepare a formal valuation as at the date it first earned income, and explain what evidence we’ll need from you. Call +61 438 080 786 for a no-pressure chat, and speak with your accountant about how the figure feeds into your CGT calculation.