Cashflow Calculator

Use this comprehensive cashflow calculator to determine your monthly cashflow on an investment property and make smarter real estate investment decisions. Whether you’re analyzing positive or negative gearing scenarios, understanding your monthly cashflow is critical to building a sustainable property portfolio that delivers long-term wealth.

What Is Cashflow in Property Investment?

Cashflow is the money left over each month after collecting rent and paying all expenses and loan repayments. It’s one of the most important metrics for evaluating investment property performance and determining whether a property fits your investment strategy.

Positive Cashflow: You make a profit each month when rental income exceeds all holding costs. This is rare in Melbourne and Sydney at current property prices but achievable in regional markets or through value-add strategies like dual occupancy development.

Negative Cashflow: You pay money out of pocket each month when expenses exceed rental income. This is common for investors pursuing a capital growth strategy in high-growth inner-city markets. While you lose money monthly, the property appreciates in value over time, building equity.

How to Calculate Monthly Cashflow

The cashflow calculation follows a simple formula that accounts for all income and expenses associated with your investment property:

Monthly Cashflow = Monthly Rent – (Loan Repayment + Property Management + Maintenance + Insurance + Council Rates + Vacancy Factor + Other Costs)

Income Components

Monthly Rent: The gross rental income you receive from tenants. Research comparable properties in your target suburb to estimate realistic rental yields. In Melbourne’s inner north, expect rental yields of 3-4% for houses and 4-5% for apartments.

Expense Components

• Loan Repayment: Your monthly principal and interest payment. This is typically your largest expense. At current interest rates (4.5-6%), a $800,000 loan on a 30-year term costs approximately $4,000-$4,800 per month.
• Property Management: Typically 7-9% of gross rent. Professional property managers handle tenant selection, rent collection, maintenance coordination, and inspections. Budget 8% of monthly rent.
• Maintenance and Repairs: Budget 1% of property value annually, or roughly $200-$400 per month for a $1 million property. This covers plumbing issues, electrical repairs, appliance replacements, and general wear and tear.
• Insurance: Landlord insurance protects against tenant damage, lost rent, and liability claims. Expect $1,000-$2,000 annually depending on property value and coverage level.
• Council Rates: Annual council rates vary by suburb but typically range from $1,500-$3,000 per year in Melbourne ($125-$250 monthly).
• Vacancy Factor: Budget for 2-4 weeks of vacancy per year when tenants change. This equates to roughly 2% of annual rent or $150 monthly on a $7,500 rental.
• Other Costs: Include strata fees (for apartments), water charges, pest control, gardening, and depreciation schedule preparation.

Cashflow Calculator Example

Let’s analyze a realistic investment property scenario using our cashflow calculator methodology:

Property Price: $1,000,000 (Melbourne inner north house)

Loan Amount: $800,000 at 4.5% interest, 30-year term

Monthly Rent: $7,500 (equivalent to $1,730 weekly)

Monthly Expenses Breakdown:

• Loan Repayment: $4,050 (principal + interest)
• Property Management (8% of rent): $600
• Maintenance Reserve: $200
• Insurance + Council Rates: $400 combined
• Vacancy Factor (2%): $150

Total Monthly Expenses: $5,400

Monthly Cashflow: $2,100 (POSITIVE)

Is This Property a Good Investment?

This example property demonstrates exceptional investment characteristics because it delivers both positive monthly cashflow AND strong capital growth potential. Properties with these dual benefits are rare in Melbourne’s current market but achievable through strategic suburb selection and value-add opportunities.

The $2,100 monthly positive cashflow provides immediate income, reduces investment risk, and improves borrowing capacity for future property acquisitions. Combined with Melbourne’s long-term capital growth averaging 7-9% annually in established inner suburbs, this investment builds wealth through multiple channels.

Key Evaluation Metrics

Beyond cashflow, assess these critical investment metrics:

• Rental Yield: ($7,500 × 12) ÷ $1,000,000 = 9% gross yield (exceptional for Melbourne)
• Cash-on-Cash Return: ($2,100 × 12) ÷ $200,000 deposit = 12.6% annual return on invested capital
• Debt Service Coverage Ratio: $7,500 ÷ $4,050 = 1.85 (healthy coverage, banks prefer >1.25)

Tax Considerations for Cashflow

Rental income is fully taxable at your marginal tax rate. However, investment properties generate significant tax deductions that reduce your taxable income and improve after-tax cashflow. Understanding investment property tax deductions is essential for accurate cashflow analysis.

Deductible Expenses

Claim immediate deductions for mortgage interest (not principal), property management fees, maintenance and repairs, insurance premiums, council rates, and all operating expenses. Additionally, claim depreciation on building structure (2.5% annually for properties built after 1987) and fixtures and fittings (various rates).

A qualified quantity surveyor can prepare a depreciation schedule identifying $10,000-$15,000+ in annual depreciation deductions for newer properties, significantly improving your after-tax cashflow position even on negatively geared investments.

For comprehensive tax planning aligned with your investment strategy, consult a property tax accountant who specializes in investment property taxation and understands the nuances of negative vs positive gearing strategies.

Improving Investment Property Cashflow

If your initial cashflow analysis shows negative cashflow, consider these value-add strategies:

Increase Rental Income

• Renovate kitchen and bathroom to command premium rent
• Add split-system heating/cooling for year-round comfort
• Implement a dual occupancy investment strategy to maximize site yield
• Add car parking in high-demand inner suburbs
• Allow pets to access larger tenant pool willing to pay premium

Reduce Holding Costs

• Refinance to lower interest rate (even 0.5% reduction saves $250+ monthly on $800k loan)
• Review fixed vs variable loan rates to optimize repayments
• Implement energy-efficient improvements to reduce tenant utility complaints
• Self-manage property to eliminate 8% management fee (only for experienced investors)
• Bundle insurance policies for multi-property portfolios to secure discounts

Next Steps for Property Investors

Now that you understand how to calculate and optimize cashflow, take action on your investment strategy. Find positive or neutral cashflow properties that align with your financial goals, risk tolerance, and investment timeline.

Whether you’re targeting high-yield regional properties or pursuing capital growth in established metro markets, accurate cashflow analysis ensures you build a sustainable portfolio that delivers wealth without overextending your finances. For detailed guidance on mortgage repayment fundamentals and loan structuring, consult with a specialized mortgage broker who understands investment property financing.