INVESTOR RESOURCES

Rental Income and Cash Flow

Use conservative income assumptions and a complete expense view to understand how a rental property may affect your monthly and annual position.

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FHP field note · reviewed 10 October 2026

Review status: use current evidence for every input

The worked example is fictional. Replace rent, vacancy, management, rates, insurance, maintenance and finance assumptions with dated evidence before drawing a conclusion.

Record the source and review date beside every transaction-specific input.

Primary sources used for this reviewAustralian Taxation Office — Residential rental properties · MoneySmart — Property investmentChecked 10 October 2026. Government rules, thresholds and property information can change. Confirm current eligibility and transaction details with the authority, lender and relevant licensed advisers before acting.

Model collected rent, not perfect occupancy.

Cash flow is not simply rent minus the loan payment. A useful model allows for vacancy, management, maintenance, statutory charges, insurance and property-specific obligations. It also makes the assumptions visible so they can be challenged.

INCOME

Use evidence-based rent estimates and distinguish gross advertised rent from rent actually received.

REGULAR COSTS

Include finance, management, rates, insurance and recurring strata or body corporate obligations.

UNCERTAINTY

Allow for vacancy, maintenance, leasing costs and changes that may not occur on a fixed schedule.

Model income timing and ownership pressure

Verify the rent range

Compare local evidence and seek current, property-specific rental advice rather than relying on one estimate.

Convert everything to one period

Place weekly, monthly, quarterly and annual amounts on the same annual or monthly basis.

Separate fixed and variable costs

This makes it easier to see which assumptions may change and which obligations remain during vacancy.

Test less favourable scenarios

Reduce the assumed rent, add vacancy and increase selected costs to understand the plan’s resilience.

Next evidence for rental income and cash flow.

Investment property costs→Due diligence checklist→Compare properties consistently→

Worked cash-flow model

Make every assumption visible and put all figures on the same time basis.

This fictional scenario shows why advertised weekly rent is not owner cash flow. It assumes a $650,000 property, a $520,000 interest-only balance, an illustrative 6.5% interest rate, $620 weekly asking rent and two vacant weeks. It excludes tax effects, depreciation, capital growth, principal repayments and buying costs.

Annual line	Calculation	Illustrative amount
Collected rent	$620 × 50 occupied weeks	$31,000
Interest	$520,000 × 6.5%	$33,800
Management allowance	7% of collected rent for illustration only	$2,170
Rates and water allowance	Property-specific estimate required	$2,600
Insurance allowance	Written quote required	$1,800
Maintenance reserve	Planning allowance, not a guaranteed cost	$2,500
Leasing/admin allowance	Agreement-specific	$800
Pre-tax cash flow	$31,000 − $43,670	−$12,670 a year / about −$1,056 a month

Interpretation: changing the rent, rate, vacancy or cost assumptions changes the result. The value of the model is not this answer; it is the ability to replace every assumption with property-specific evidence and test a less favourable case.

Three scenarios to retain

Base case

Current quotes and conservative rent evidence, with normal vacancy and maintenance.

Pressure case

Lower collected rent, longer vacancy, higher interest and one material repair.

Liquidity case

How many months the available buffer can meet ownership obligations without rent.

Official starting points

Australian Taxation Office: residential rental properties — Current ATO guidance on rental income, expenses and records.
MoneySmart: property investment — Australian Government guidance on costs, risk and property-investment decisions.