How to Use the Property Cash Flow Calculator

Enter the expected weekly rent, property value, vacancy allowance and annual property expenses. Then enter your investment-property loan balance, interest rate and repayment type.

The calculator estimates:

• Gross annual rent;
• Rental income after vacancy;
• Property management fees;
• Total operating expenses;
• Net operating income;
• Annual loan repayments;
• Estimated loan interest;
• Annual, monthly and weekly cash flow;
• Gross rental yield;
• Net rental yield; and
• Break-even weekly rent.

What Is Property Cash Flow?

Property cash flow is the amount of money remaining after rental income is reduced by property expenses and finance payments.

A property can be:

• Cash-flow positive — rental income exceeds expenses and finance payments;
• Cash-flow neutral — income roughly equals costs; or
• Cash-flow negative — property costs exceed rental income.

Basic Property Cash Flow Formula

For investment analysis it is often helpful to separate operating expenses from finance costs.

Property Cash Flow Example

What Is Gross Rental Income?

Gross scheduled rental income is the amount of rent you would receive if the property were rented for the full year at the entered weekly rate.

What Is Vacancy Allowance?

A rental property may not be occupied for every day of the year. A vacancy allowance provides a simple way to model lost rental income.

For example, a 3% vacancy allowance means the calculator assumes you collect approximately 97% of the scheduled rent.

What Expenses Should Be Included in Property Cash Flow?

Common investment-property expenses can include:

• Property management fees;
• Council rates;
• Water charges;
• Landlord insurance;
• Building insurance;
• Body corporate or strata levies;
• Repairs and maintenance;
• Land tax;
• Gardening and pool maintenance;
• Pest control;
• Accounting costs; and
• Other property expenses.

What Is Net Operating Income?

Net operating income, often abbreviated to NOI, measures rental income after ordinary property operating expenses but before loan repayments.

Separating NOI from finance costs can help compare properties with different loan structures.

Does Net Operating Income Include Mortgage Payments?

No. In this calculator, loan repayments are excluded from NOI.

Mortgage payments are deducted after NOI to calculate cash flow after finance.

Interest-Only Property Loan Cash Flow

For an interest-only loan, the simplified annual finance payment is:

For example, a $500,000 loan at 6% interest has a simplified annual interest cost of:

$500,000 × 6% = $30,000

Principal-and-Interest Property Loan Cash Flow

With a principal-and-interest loan, each payment generally includes both interest and principal repayment.

The calculator uses a standard amortising-loan formula to estimate the monthly repayment and multiplies that amount by 12 for the annual cash-flow calculation.

What Is Gross Rental Yield?

Gross rental yield compares annual scheduled rent with the property value before operating expenses.

What Is Net Rental Yield?

Net rental yield provides a broader measure by deducting operating expenses from rental income before comparing the result with property value.

This calculator calculates net yield before finance costs.

Gross Yield vs Cash Flow

A property can have a relatively strong gross rental yield and still produce negative cash flow if:

• The loan balance is high;
• The interest rate is high;
• Body corporate fees are substantial;
• Repairs are expensive;
• Vacancy is high; or
• Other property expenses are significant.

Rental yield and actual investor cash flow therefore measure different aspects of property performance.

What Is Break-Even Rent?

Break-even rent is the approximate weekly rent required for the property’s effective rental income to cover both operating expenses and loan repayments under the assumptions entered.

The calculator converts this annual amount into an approximate weekly rent.

Positive Cash Flow Property

A positive cash-flow property generates more cash rental income than the estimated property expenses and finance payments.

Positive cash flow does not necessarily mean the investment has the highest overall return because capital growth, tax, transaction costs and other factors can also affect investment performance.

Negative Cash Flow Property

A negatively geared or cash-flow-negative property requires the owner to contribute cash because rental income is insufficient to cover the property’s costs.

Negative cash flow and negative gearing are related but not identical. Cash flow looks at actual cash movement, while tax deductions and depreciation can affect the taxable property result differently.

For tax modelling, use the Negative Gearing Calculator.

Cash Flow vs Negative Gearing

Property cash flow

Measures the actual cash coming in and going out of the property.

Negative gearing

Generally refers to an investment where deductible expenses exceed assessable rental income for tax purposes.

A property can have tax deductions that do not require immediate cash payments, such as some depreciation deductions, meaning taxable income and actual cash flow can differ.

Does This Calculator Include Tax Benefits?

No. The calculator is intentionally a pre-tax cash-flow tool.

It does not automatically calculate:

• Income tax deductions;
• Negative gearing tax benefits;
• Capital works deductions;
• Depreciation;
• Capital gains tax;
• Land-tax thresholds; or
• Other personal tax effects.

Does This Calculator Include Depreciation?

No. Depreciation and capital-works deductions can affect taxable rental income but usually do not represent the same type of current cash expense.

For that reason, they are not automatically included in this cash-flow calculator.

How Does Interest Rate Affect Property Cash Flow?

Higher loan interest rates generally increase finance costs and reduce cash flow.

For example, on a $500,000 interest-only loan:

• 5% interest = approximately $25,000 per year;
• 6% interest = approximately $30,000 per year;
• 7% interest = approximately $35,000 per year.

A one-percentage-point rate change can therefore materially affect an investment property’s annual cash requirement.

How Does Vacancy Affect Property Cash Flow?

A higher vacancy rate reduces collected rental income while many property expenses continue.

Properties with frequent tenant turnover or weak rental demand may therefore need a larger vacancy allowance than highly occupied properties.

Why Include Property Management Fees as a Percentage?

Property-management fees are commonly charged as a percentage of rent collected, although actual fee structures vary between agencies.

The calculator therefore applies the management percentage to effective rent after vacancy.

Does This Calculator Include Letting Fees?

You can include annualised letting fees, advertising costs or other management-related costs in the Other Annual Property Expenses field if they are not already reflected elsewhere.

Can I Use This Calculator for Apartments?

Yes. Apartment owners can enter annual body corporate or strata levies in the dedicated field.

Large strata levies can have a substantial effect on net cash flow and net rental yield.

Can I Use This Calculator for Houses?

Yes. For a freestanding house, simply leave body corporate or strata at zero where it does not apply.

Can I Use This Calculator Before Buying an Investment Property?

Yes. It can be used as a property-investment feasibility tool by entering expected rent and estimated expenses before purchasing.

Useful assumptions to stress-test include:

• Higher interest rates;
• Lower weekly rent;
• Higher vacancy;
• Higher maintenance costs;
• Body corporate increases; and
• Land-tax changes.

Property Cash Flow Calculator Assumptions

This calculator assumes:

• Weekly rent remains constant for the year;
• There are 52 weeks in the annual rental calculation;
• The entered vacancy percentage applies to gross scheduled rent;
• Property-management fees apply to effective rent;
• All entered annual expenses occur during the year;
• Interest-only loans use the entered balance and annual rate;
• Principal-and-interest repayments use a standard amortisation formula;
• The loan balance does not change during interest-only estimates;
• No offset-account balance is included;
• No tax deduction is calculated;
• No depreciation is included;
• No capital growth is included;
• No buying or selling costs are included; and
• Results are estimates rather than investment or tax advice.

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