How to Read Rental Property Cash Flow
Calculating the difference between your net rental income and your monthly mortgage obligation.
Buying a property to rent out is fundamentally the same as running a small business. Just like any business, the health of your investment property is determined by one metric: Cash Flow. Cash flow is the pure cash that goes into your pocket (or comes out of it) every month after all obligations are paid.
Steps to Read Your Cash Flow
To figure out whether your property is making you money or draining your resources, you must calculate from the grossest income down to the net result. Let's break it down step-by-step:
- Gross Rental Income: This is the expected rent you would collect if the property were 100% occupied year-round without interruption.
- Minus Vacancy Allowance: A new tenant rarely moves in the exact same day the old one moves out. You must assume your property will sit empty for a few weeks or months each year while you secure a new lease.
- Minus Operating Costs: You must pay management/strata fees, building insurance, annual property taxes, and routine maintenance costs. Subtracting vacancies and operating costs from your gross rent leaves you with the Net Operating Income (NOI).
- Minus Debt Service: If you purchased the property using a mortgage, you must subtract your monthly principal and interest payments from your NOI. The final resulting number is your Pre-tax Cash Flow.
Positive vs. Negative Cash Flow
If the final Cash Flow number is positive, it means your rental income not only covers every operational cost and your entire mortgage obligation, but also leaves extra cash in your pocket. The property is financially "paying for itself."
However, if the number is negative, it means you must reach into your own personal savings every single month to cover the shortfall in the mortgage or maintenance bills.
An Example of Negative Cash Flow
Let's look at a hypothetical example: You buy an apartment and successfully rent it out for IDR 5,000,000 per month. However, you must pay a monthly strata fee of IDR 1,000,000. Your Net Operating Income is therefore IDR 4,000,000/month.
If your mortgage payment to the bank is IDR 6,500,000/month, you have a negative cash flow of IDR 2,500,000 every single month. You must have cash reserves ready to subsidize this investment.
Why Negative Cash Flow Isn't Always Bad
Kavesta never hides or manipulates negative cash flow in its calculations, because experiencing negative cash flow in the early years of a leveraged property investment is incredibly common.
Many investors are willing to absorb a temporary negative cash flow because they are targeting long-term profit from the property's rising value (Capital Appreciation), or because they project rental rates will increase in the future while their fixed mortgage payment stays the same.
Use the Property ROI Calculator to view a transparent breakdown of your monthly cash flow, allowing you to prepare the exact cash reserves needed without guesswork.