It's Just a Math Problem: My Real Estate Philosophy in One Sentence
When people ask how I decide whether to buy a property, they expect a long answer. Here's the truth: I don't buy based on market trends or gut instinct. I buy based on math — and cash flow is the only number that matters from day one.
When people ask me how I decide whether to buy a property, they usually expect a long answer. Market trends, growth projections, gut instinct. Here's the truth: I don't buy based on any of that. I buy based on math.
I've built my entire portfolio around one idea: cash flow. Every property has to bring in more money than it costs to operate, every single month, from day one. Not eventually. Not once the market turns. Now.
That might sound obvious, but it's not how all people approach real estate. Some people buy a property hoping it goes up in value, and treat the monthly numbers as a secondary concern. I do the opposite. Appreciation is a bonus. It's not part of my decision, and it's never the reason I buy.
How the Math Actually Works
Before I buy anything, I run conservative projections to make sure the numbers hold up. Specifically, I need the property's income to comfortably cover three things:
- Operating expenses — taxes, insurance, maintenance, repairs, management, vacancy, all of it.
- Debt service — the monthly mortgage payment.
- Cash flow — what's left over after the first two. This has to be meaningfully more than $0. If a deal only breaks even, it's not worth doing.
The order matters here. I don't start with "how much can I borrow" and work forward. I start with what the property can actually support — rental income minus expenses — and work backward from there to figure out the debt service I can afford, and from that, the down payment I'd need given current loan terms.
Income determines the debt. Not the other way around.
A Real Example
Here's a simple way to see why this matters. Say a property costs $400,000, rents for $3,000/month, and has $10,400 in annual operating expenses — leaving $25,600 in net operating income (NOI). At 0% down, this deal loses $3,200 a year. At 10% down, it barely breaks even. At 25% down, it generates $4,000 in annual cash flow — a 4% cash-on-cash return on a structure you can actually hold for years.
Same property. Same rent roll. Three completely different outcomes, based entirely on leverage.
Why I Stick to This, Even When It's Harder
This approach doesn't require a specific city, a specific market cycle, or low interest rates to work. It works anywhere. But it's not always easy — in hot markets or high-rate environments, finding a property where the math actually works takes more effort, more creativity, and sometimes more cash up front. That's the tradeoff for discipline: fewer deals, but ones I can trust.
And because I hold properties for a long time, appreciation still shows up eventually — I just don't count on it going in. Over the years, that equity growth has opened doors: selling at a gain, doing a 1031 exchange into something bigger, or refinancing to pull cash out while keeping the income intact. Those are real benefits. They're just not the starting point.
The One-Line Version
If I had to boil down my investing approach into a single sentence, it's this: it's just a math problem. No hype, no emotion, no betting on the market doing what I want. Either the numbers work under conservative assumptions, or they don't — and if they don't, I walk away, no matter how good the story sounds.
Everything else — the deals, the refinances, the spreadsheets — all comes back to this one idea. Get the math right first, and the rest takes care of itself.