Investment Property Cash Flow in Australia: How to Calculate Your Real Weekly Cost (2026)

The single most important number for any investment property purchase is not the purchase price, the rental yield, or even the capital growth rate — it is the real weekly out-of-pocket cost after tax. This is the actual amount you need to find from your own income each week to hold the property, after all expenses, mortgage interest, depreciation deductions, and the negative gearing tax benefit have been accounted for.

Many investors are surprised to find their actual weekly cost is significantly lower than their raw cash shortfall suggests — because depreciation and the tax benefit together can reduce the effective cost by 30–50%.

This guide explains how investment property cash flow works in Australia, how to calculate your real after-tax weekly cost, and what the numbers look like for common property scenarios.

Use the Investment Property Cash Flow Calculator to calculate your exact position.

Quick answer: Your real weekly cost = (annual rent − annual cash expenses − annual mortgage interest) ÷ 52, adjusted for the annual tax saving from the rental loss (including depreciation). On a $700,000 property at 6.0% interest-only with 4.8% gross yield, the pre-tax weekly shortfall is typically $100–$200 per week. After the negative gearing tax benefit at 37%, the real cost is often $60–$120 per week.

What Is Investment Property Cash Flow?

Cash flow on an investment property is the difference between what comes in (rent) and what goes out (all expenses including mortgage interest). There are two ways to measure it:

Pre-tax cash flow: Rent minus all cash expenses (mortgage interest, management fees, council rates, insurance, maintenance, strata). This is your actual cash position — the money you physically need to find each week to cover the property's costs.

After-tax cash flow: Pre-tax cash flow adjusted for the tax saving (or extra tax) from your rental position. When the property is negatively geared — producing a rental loss including depreciation — the ATO effectively subsidises part of your holding costs through a reduced tax bill. This is the number that matters most for budgeting.

The Three Cash Flow Scenarios

Negatively Geared (Most Common in Capital Cities)

A property is negatively geared when total deductible expenses (including depreciation) exceed rental income. The net rental loss reduces your taxable income and saves tax at your marginal rate.

Most Australian capital city properties are negatively geared at current interest rates (6.0–6.5%). A property with a 4–5% gross yield funded by a 6%+ mortgage will almost always produce a pre-tax cash shortfall — which becomes meaningful if the property also has good depreciation deductions.

Positively Geared (Common in Regional Areas)

A property is positively geared when rental income exceeds all deductible expenses including mortgage interest. The net rental profit adds to your taxable income — you pay extra tax, but you are cash flow positive each week.

Regional properties with gross yields of 6–8%+ can be positively geared even at current interest rates, depending on the loan structure and expense level.

Cash Flow Neutral

A property where rental income approximately equals deductible expenses. Common at the break-even gross yield of roughly 7–8% at current mortgage rates (once expenses are factored in on top of the interest rate).

Every Expense That Goes Into the Calculation

To calculate accurate cash flow, you need to account for every cash expense and the non-cash depreciation deduction:

Cash expenses (annual):

Expense	Typical range	Notes
Mortgage interest	Loan balance × interest rate	Interest portion only on P&I; all of repayment on IO
Property management fees	7–10% of gross rent	Plus letting fees, inspection fees
Council rates	$1,200–$2,500/year	Check council website for your area
Landlord insurance	$1,000–$2,000/year	Building + landlord protection
Repairs and maintenance	0.5–1% of property value/year	Budget higher for older properties
Water rates	$600–$1,200/year	Where landlord pays
Strata/body corporate	Varies widely	Apartments only
Land tax	Varies by state/land value	Deductible; see Land Tax Calculator
Accounting/tax agent fees	$300–$800/year	Portion attributable to rental property

Non-cash deduction:

Deduction	Rate	Notes
Div 43 building allowance	2.5% of construction cost/year	Requires QS report; properties built after 1985
Div 40 plant and equipment	Asset-specific rates	Requires QS report; new items only for second-hand properties post-July 2017

How to Calculate After-Tax Weekly Cost

Step 1: Add up all annual cash expenses (including mortgage interest)

Step 2: Calculate annual rental income (weekly rent × 52)

Step 3: Pre-tax annual cash flow = rental income − cash expenses

Step 4: Add depreciation to get taxable rental income/loss: Taxable rental position = pre-tax cash flow − depreciation

Step 5: Calculate tax saving (if negatively geared): Tax saving = taxable rental loss × marginal rate

Step 6: After-tax annual cash flow = pre-tax cash flow + tax saving

Step 7: After-tax weekly cost = after-tax annual cash flow ÷ 52

Worked Examples

Example 1 — Negatively Geared House, Sydney

Property: $900,000 established house, purchased 2021 (grandfathered for negative gearing) Loan: $720,000 interest-only at 6.25% = $45,000/year interest Rent: $680/week = $35,360/year Salary: $140,000 (marginal rate: 37%) Depreciation: $8,500/year (Div 43 + Div 40, from QS report)

Item	Annual	Weekly
Rental income	$35,360	$680
Mortgage interest	($45,000)	($865)
Management fees (8.5%)	($3,006)	($58)
Council rates	($1,800)	($35)
Insurance	($1,600)	($31)
Maintenance	($1,500)	($29)
Pre-tax cash flow	($17,546)	($337)
Depreciation (non-cash)	($8,500)
Taxable rental loss	($26,046)
Tax saving (37%)	$9,637	$185
After-tax cash flow	($7,909)	($152)

The pre-tax cost is $337/week. After the negative gearing tax benefit, the real cost is $152/week — less than half. Depreciation alone contributes $3,145/year ($60/week) to the tax saving.

Example 2 — Positively Geared Property, Regional QLD

Property: $420,000 house in Toowoomba, purchased 2024 (new purchase of established property — quarantined losses from 1 July 2027) Loan: $336,000 interest-only at 6.25% = $21,000/year interest Rent: $520/week = $27,040/year Salary: $95,000 (marginal rate: 30%) Depreciation: $4,000/year

Item	Annual	Weekly
Rental income	$27,040	$520
Mortgage interest	($21,000)	($404)
Management fees (8.5%)	($2,298)	($44)
Council rates	($1,400)	($27)
Insurance	($1,200)	($23)
Maintenance	($800)	($15)
Pre-tax cash flow	$342	$6.50
Depreciation (non-cash)	($4,000)
Taxable rental loss	($3,658)
Tax saving (30%)	$1,097	$21
After-tax cash flow	$1,439	$27.67

This property is slightly cash flow positive before tax (+$6.50/week) and more positive after the tax saving (+$27.67/week). Note: from 1 July 2027, the quarantining rules apply — the $3,658 taxable loss cannot offset salary income, only future rental income. The $1,097 annual tax saving disappears until the property becomes positively geared on a cash basis or is sold.

Example 3 — New Build, Melbourne

Property: $650,000 off-the-plan apartment, completed 2025 Loan: $520,000 interest-only at 6.25% = $32,500/year Rent: $560/week = $29,120/year Salary: $160,000 (marginal rate: 37%) Depreciation: $14,000/year (new build — full Div 43 + Div 40 available)

Item	Annual	Weekly
Rental income	$29,120	$560
Mortgage interest	($32,500)	($625)
Management + expenses	($7,500)	($144)
Pre-tax cash flow	($10,880)	($209)
Depreciation (non-cash)	($14,000)
Taxable rental loss	($24,880)
Tax saving (37%)	$9,206	$177
After-tax cash flow	($1,674)	($32)

The new build's higher depreciation is the key differentiator — $14,000/year in non-cash deductions generates $5,180/year in additional tax saving ($99/week) compared to the same property with no depreciation. Real weekly cost: $32/week on a $650,000 asset.

Interest-Only vs Principal and Interest

Most investment property cash flow calculations use interest-only (IO) loans because:

IO loans maximise deductible interest (the full repayment is deductible)
On a P&I loan, the principal repayment is not tax deductible — only the interest portion
IO minimises weekly cash outflow, improving short-term cash flow
The principal reduction on a P&I loan builds equity but reduces deductible interest over time

The Investment Property Cash Flow Calculator uses interest-only by default. If you have a P&I loan, your interest component decreases each year — your actual deductible interest in year 3 is less than in year 1.

The Cash Neutral Rent

One useful output of the cash flow calculation is the cash neutral rent — the weekly rent at which the property would break even on a pre-tax basis given all cash expenses. This is the minimum rent needed to cover all costs without any additional cash contribution from the investor.

The Investment Property Cash Flow Calculator displays this figure automatically. If your current rent is below the cash neutral rent, you are cash flow negative. If above, you are cash flow positive.

Frequently Asked Questions

How do I calculate investment property cash flow?

Annual cash flow = annual rent − (mortgage interest + management fees + council rates + insurance + repairs + strata + other expenses). After-tax cash flow adds back the tax saving from the rental loss (including depreciation): after-tax cash flow = pre-tax cash flow + (taxable rental loss × marginal tax rate). Divide by 52 for the weekly figure. Use the Investment Property Cash Flow Calculator to calculate automatically.

How much does an investment property cost per week in Australia?

It depends on the property price, rental yield, mortgage rate, and your tax rate. On a $700,000 property with a 4.8% gross yield and 6.25% interest-only loan, the typical pre-tax cash shortfall is $150–$250/week. After the negative gearing tax benefit at 37%, the real cost is often $80–$150/week. Depreciation can reduce this further by $50–$100/week on newer properties.

What is a good cash flow on an investment property?

There is no universal benchmark — it depends on your investment strategy. Cash flow positive (green) means the property funds itself and generates income. Cash flow negative (red) means you are subsidising the property each week in exchange for (hopefully) greater capital growth over time. Most Australian investors in capital cities accept negative cash flow of $50–$200/week in exchange for long-term capital appreciation.

Does depreciation reduce my weekly property cost?

Yes — significantly. Depreciation is a non-cash deduction that increases your taxable rental loss without requiring any cash outgoing. At 37% marginal rate, $10,000 in annual depreciation saves $3,700 in tax — $71/week — without you spending any money. New builds generate the most depreciation because all plant and equipment items and the full building cost qualify.

Should I use interest-only or principal and interest for an investment property?

Most investors use interest-only loans for investment properties to maximise deductible interest and minimise weekly cash outflow. P&I loans reduce your loan balance over time (building equity) but the principal repayment is not tax deductible. The optimal structure depends on your personal cash flow, other debt, and tax position — discuss with a mortgage broker and accountant.

This article is general information only and does not constitute financial or tax advice. Always verify your position with a registered tax agent or financial adviser.