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Now, let's dive into today's episode...
Most investors calculate rental property cash flow wrong — and they don't find out until they own the property.
The mistake isn't arithmetic. It's leaving out entire expense categories. In this episode, J. Massey walks through the complete formula he actually uses to analyze deals — every line item, with real numbers, in the order they matter.
In This Episode:
- Why the "$2,000 rent minus $1,200 mortgage = $800 cash flow" math is almost always wrong
- The 8-line formula every rental property analysis needs
- How to calculate vacancy allowance, property management, taxes, insurance, repairs, and CapEx reserve
- What honest net cash flow looks like on a mid-market deal
- Why knowing the real numbers before you buy protects you through market corrections
Key Takeaway:
Cash flow is what keeps you solvent short-term. Run all 8 line items every time — even when it makes the deal look worse on paper.
Get the full calculator walkthrough at cashflowdiary.com.
Full Transcript:
What's up, what's up, what's up — welcome back to the CashFlow Diary podcast. I'm J. Massey, and today we're talking about something that trips up almost every new investor I meet.
Cash flow. More specifically — how to actually calculate it. Because here's what I see all the time: an investor brings me a deal, they're excited, the property cash flows five hundred dollars a month. And I sit down, I start asking questions, and five minutes later — we're at eighty dollars. Sometimes we're negative.
And the investors are always surprised. They're not making arithmetic mistakes. They're leaving out entire expense categories. Categories that are absolutely going to show up once they own the property. The math doesn't lie. But incomplete math will.
So today I'm walking you through the rental property cash flow calculator formula I actually use. Every line item. Real numbers. In the order they matter. Stay with me.
Let's start with the basics. What is cash flow, really? Cash flow is what's left after every legitimate expense — and your mortgage payment — come out of your rent. Not appreciation. Not loan paydown. Not paper gains. Cash — the money that hits your bank account every month.
This distinction matters more than people realize. A property can make money over ten years through appreciation while bleeding you three hundred dollars a month the entire time. Cash flow is what keeps you solvent in the short term. It's the difference between an investment that funds your life and one that slowly drains it.
Now — the formula. Let's go line by line.
Step one. Gross Rental Income. This is the full rent at one hundred percent occupancy. For a long-term rental, it's your monthly lease rate. Simple.
Step two. Vacancy Allowance. Eight to ten percent, every time. No property stays fully occupied every month of every year. Tenant turnover happens. Lease-up periods happen. Slower months happen. Remove vacancy from your analysis to make the numbers look better, and you're just setting yourself up for a number that was always going to happen.
Your Gross Effective Income equals your Gross Rental Income multiplied by ninety to ninety-two percent. That's your starting point for all expenses.
Step three. Operating Expenses. This is where most deals collapse on paper — and this is where you have to be honest with yourself. Here's what goes in operating expenses: Property management — eight to twelve percent of gross rents. Even if you self-manage today, you need to model this. Property taxes — pull the actual number from the county assessor's office. Don't estimate. Insurance — landlord insurance for a single-family home typically runs twelve hundred to twenty-four hundred dollars per year. Repairs and maintenance — budget one percent of property value per year.
Capital expenditures. CapEx. This is the one most investors skip. Roof. HVAC. Water heater. Appliances. Everything in that house is going to break eventually. Budget five to ten percent of gross rent per month into a reserve account. Not spending it — reserving it. Because the day your HVAC goes, you will be glad you did.
Add all of that up and on a typical mid-market property you're looking at thirty-five to fifty percent of your gross rental income. Before you touch the mortgage.
Step four. Debt Service. Principal and interest on your mortgage. This is not optional. Net cash flow equals Gross Effective Income minus total operating expenses minus debt service. On a property renting for two thousand dollars a month with a twelve hundred dollar mortgage payment — after you run the real numbers — honest net cash flow is somewhere between one hundred and three hundred fifty dollars per month on a well-analyzed deal. If you overpaid, it's negative. That's the deal.
Here's why I'm sharing this with you today. Not to discourage you. Not to make real estate look hard. But because the investors who survive and scale are the ones who see deals clearly. When you know the real numbers before you buy, you can negotiate better. You can walk away from bad deals without regret. You can hold your properties through market corrections because you're not bleeding cash every month.
The formula isn't complicated. What's hard is being disciplined enough to fill in every line, every time, even when it makes a deal look worse. I put together a full walkthrough of this formula — with real numbers and a real deal scenario — at cashflowdiary.com. The link is in the show notes.
If this episode helped you think differently about how you analyze deals, I'd really appreciate a five-star review. It takes thirty seconds and it helps more investors find this show. Subscribe if you're not already — we drop new episodes every week. I'm J. Massey. Let's go build cash flow.
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