How to work out a good property investment

Not all property investors understand the return on their rental.

Saturday, March 19th 2022

Barfoot & Thompson has put together a handy guide on property investment. Auckland’s biggest rental agency says investing in property isn't rocket science but does require a bit of homework.

That’s where understanding potential returns on investments comes in. While it’s every property investor’s aim to own a property that has a high yield, will deliver a big capital gain, has a strong rental return and requires little maintenance, few achieve that.

Barfoot & Thompson says investors need to learn some basics to help them understand returns.

Capital gain

Capital gain is the profit investors make when they sell an investment for more than they paid for it.

Some people buy investment properties to make a long-term profit - as prices rise over time. This strategy may be coupled with little or no profit in the short term, as expenses, such as mortgage repayments and insurance, also need to be taken into consideration.

Rental yield

Yield comes from the rental money received from tenants. It's the rent a property can provide over a year, expressed as a percentage of its purchase price.

Gross yield

This is the income return on an investment property before any expenses, outgoings or possible rental vacancies are taken into account. Gross yield does not take interest rates into account.

Gross rental yield is commonly used when looking at returns, as it is simple to calculate and lets investors easily compare properties with different values and rental returns.

Net yield

This is the income return on an investment property after any expenses or other outgoings, such as maintenance and insurance, are taken out. Net yield is sometimes referred to as ‘rate of return’.

Top tip

Although the gross rental yield is a simple calculation, it’s important to remember that it doesn’t take other factors, such as expenses, interest rates or periods of vacancy, into account.

For example, a property may have a high rental yield but may also have high maintenance costs, which may make the rental return low when taken into consideration.

High yield for cheaper areas

It’s a general rule of thumb that yields are higher in cheaper areas. But the return always needs to be weighed up alongside other factors such as maintenance, tenants, expenses and capital gain.

Calculating gross rental yield

To calculate, take the annual rental income (weekly rent x 52 weeks)' and divide by the property value. Then multiply this number by 100.


Property value $600,000 and expected rent $500 a week.
$26,000 ($500 x 52 weeks - annual rental income ÷ $600,000 (property value) x 100. Yield = 4.33%

Calculating net rental yield

To calculate, take the annual rental income and minus the annual expenses or loss of rental income from this. Then divide this number by the property value and multiply this number by 100.


Property value $600,000, expected rent $500 a week and expenses/loss $5000. $26,000 ($500 x 52 weeks - annual rental income) - $5000 (annual expenses/loss) ÷ $600,000 (property value) x 100. Yield = 3.5%

Expenses or loss of rental income can include: buying and transaction costs (property purchase price, legal fees and building inspections, any start-up loan fees); annual costs such as vacancy costs (loss of rent and advertising); repairs and maintenance; property management fees; insurance;


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