Should you keep your first home as an investment when you upsize?

When you're ready to move on to your next home, selling the one you're in isn't the only option. Keeping your first home and renting it out, while using its equity to help buy the next one, is a path a lot of movers don't even realise they have. It can also be how you become a property investor almost by accident. Here's how to think it through properly.

Keep or sell: two different paths

Selling first is the simpler option. You settle, use the proceeds toward your next home, and you're back to one mortgage and one set of costs.

Keeping your first home turns it into a rental. You use its equity to help fund the next purchase, take on a second mortgage, and pick up a tenant, a rental income, and some landlord responsibilities along the way.

Neither path is automatically the right one. It comes down to your cash flow, how much equity you actually have, whether the property would make a decent rental, and how comfortable you are managing two properties instead of one.

Using your equity to buy the next home

As a home grows in value and your loan balance comes down, the gap between the two is usable equity. Lenders will generally let you borrow up to a set share of your home's value (commonly around 80%, sometimes a little higher with lender's mortgage insurance), and the difference between that figure and what you still owe is what's available to put toward your next purchase.

Keep in mind this increases the debt secured against your first home, so it's worth running the numbers properly rather than estimating. Our guide to using home equity goes deeper on the mechanics.

The tax side: turning a home into a rental

Your home is generally free of capital gains tax (CGT) while you live in it as your main residence.

If you move out and rent it out, the six-year rule can, in some circumstances, let you keep that CGT exemption for up to six years, even though someone else is living in it and paying you rent. There are conditions attached, including not treating another property as your main residence at the same time, so this needs proper advice, not assumptions.

Converting a home into a rental has other tax consequences too: how loan interest is treated, depreciation, and land tax in some states. It's genuinely worth speaking with a registered tax agent before you decide anything. This isn't tax advice.

It's also worth knowing that negative gearing and capital gains tax settings for investment properties have changed and take effect from 1 July 2027. If you're planning to hold the first home long term as a rental, factor that into the conversation with your tax agent.

Can you afford both? Serviceability with two properties

This is where a lot of the decision to keep the property actually gets made, and it's a numbers question.

• Lenders count your existing mortgage repayment in full when working out what else you can borrow.
• If you're renting the first home out, expected rental income can help, but lenders typically only count a portion of it (commonly 70 to 80%) to allow for vacancies and costs.
• A serviceability buffer is applied on top of the actual interest rate, and your other commitments (credit cards, personal loans, buy now pay later) all count too.
• Owner-occupier loans are almost always principal and interest, so budget for real repayments on your new home, not interest-only.

Holding two properties is genuinely achievable for a lot of people. But it needs a proper assessment against your actual numbers.

The upside: becoming an investor almost by accident

For a lot of next home buyers, keeping the first home isn't a grand investment strategy, it's simply choosing not to sell. But the outcome is the same either way: you now own an investment property, with a tenant helping pay down the loan and, potentially, capital growth building in the background.

It can be a low-drama way into property investing, especially if it's a home and area you already know well. It won't suit everyone, but it's worth genuinely weighing up before you list your home for sale out of habit.

When keeping isn't the right move

• Cash flow is already tight, and two mortgages would stretch things too far.
• The home isn't in a location or condition that would attract solid tenants.
• You'd rather not take on landlord responsibilities: maintenance, tenant issues, compliance.
• You need the sale proceeds to comfortably afford the next home.
• The property's long-term growth prospects are modest compared with other uses for that equity.

Deciding whether to keep or sell your first home is one of the bigger financial calls you'll make when moving, and it deserves proper numbers. koala financial can run your serviceability both ways, keep or sell, so you can see the real difference before you decide.

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