Eighteen months ago, a client of mine bought a duplex in Mesa with 20% down, locked in a 7.4% mortgage, and projected a monthly cash flow of about $400. Today, after a water heater replacement, a roof repair, and two months of vacancy between tenants, he’s net negative for the year. The property isn’t a disaster. But leverage — the tool that was supposed to amplify his returns — quietly turned a mediocre year into a losing one.
That’s the real story of leverage in 2024 and into 2025. It’s not that borrowing to buy real estate is bad. It’s that the math has shifted dramatically, and a lot of investors are still running numbers like it’s 2020.
The Leverage Math Has Changed — And Most Investors Haven’t Caught Up
When interest rates were sitting below 4%, leverage was almost too easy to justify. Put 20% down, borrow the rest, collect rent, and watch your return on equity climb into the double digits. A $400,000 property financed at 3.5% carried a principal and interest payment of roughly $1,437 per month on an 80% loan. At today’s rates — averaging around 7.25% on a 30-year investment loan — that same loan costs closer to $2,183 per month. That’s a $746 monthly gap you have to recover from rent before you even think about maintenance, insurance, property taxes, or vacancy.
In the Phoenix metro, median single-family home prices are still hovering around $435,000 as of early 2025. Rents in most submarkets haven’t kept pace with that financing cost increase. A three-bedroom rental in Gilbert or Chandler that rents for $2,100 per month looked great against a $1,437 mortgage. It looks a lot thinner against $2,183. Strip out taxes, insurance, and a reasonable vacancy reserve, and your cash-on-cash return can drop below 2% — or turn negative entirely.
Leverage amplifies both gains and losses. Everyone remembers the gains from 2020 to 2022. Fewer people talk openly about what happens when rates double and rent growth flattens.
The Hidden Costs That Investors Consistently Underestimate
Here’s what kills leveraged deals that look fine on paper: it’s rarely one big expense. It’s the accumulation of costs that investors either ignore or lowball when they’re running their pro forma.
Capital expenditure reserves are the most common blind spot. Most experienced investors recommend budgeting 1% to 2% of a property’s value annually for CapEx — things like HVAC systems, roofing, plumbing, appliances, and flooring. On a $435,000 property, that’s $4,350 to $8,700 per year sitting in reserve. How many new investors actually account for that? In my experience, maybe one in four.
Vacancy is another number people fudge. Phoenix metro vacancy rates have ticked up over the past year as new apartment supply hit the market. Single-family rentals in suburbs like Queen Creek and Buckeye are sitting longer than they were 18 months ago. Budgeting 5% vacancy in a market where you’re actually seeing 8% to 10% between tenancies can quietly destroy your annual return.
Then there’s the debt service itself. A leveraged investor is contractually obligated to make that mortgage payment every single month — occupied or vacant, good year or bad year. That’s the part of leverage that doesn’t get enough airtime. Equity investors can weather a tough quarter. Leveraged investors have to survive it.
What Conservative Investing Actually Looks Like Right Now
Being conservative doesn’t mean sitting on the sidelines. It means recalibrating your criteria to match the current environment rather than the one that existed three years ago.
Start with your minimum cash-on-cash threshold. In a 7%-rate environment, I tell clients not to buy a rental unless they can underwrite at least a 6% to 8% cash-on-cash return using realistic numbers — real vacancy, real CapEx reserves, real property management fees if applicable. If the deal only pencils at 3% using rosy assumptions, it’s not a deal. It’s hope dressed up as a spreadsheet.
Down payment size matters more than it used to. Putting 25% or even 30% down reduces your monthly debt service enough to restore some of that cash flow buffer. Yes, it ties up more capital. But in a tight-margin environment, that buffer is what keeps a property from bleeding when something inevitably goes wrong. Investors who stretched to 15% down to maximize leverage in 2023 and 2024 are the ones calling me now with problems.
Consider smaller, less glamorous markets within the Phoenix metro where price-to-rent ratios still work. Parts of El Mirage, Avondale, and western Peoria still offer single-family homes in the $280,000 to $320,000 range with rents that can clear $1,700 to $1,900 per month. The numbers aren’t exciting, but they’re functional. Sometimes functional is exactly what you need.
The Investors Who Will Win in This Market
Investors who thrive over the next three to five years in Arizona will share a few common traits. They’ll carry less leverage than they could technically qualify for. They’ll hold larger cash reserves — ideally three to six months of total mortgage payments per property. They’ll be selective about what they buy instead of chasing volume.
They’ll also benefit from the fact that a lot of overleveraged investors bought between 2021 and 2023 at peak prices with adjustable or short-term financing. As those loans reprice or those investors exhaust their reserves, distressed opportunities will surface. The buyer with a conservative balance sheet and cash reserves is the one positioned to move on those deals.
Leverage is still a legitimate wealth-building tool in real estate. But right now it requires a shorter leash and a lot more honesty about the numbers than most investors bring to the table. If your deal only works under perfect conditions, it doesn’t work. Run your numbers assuming something goes wrong — because in real estate, something always does.
If you’re evaluating a rental purchase in the Phoenix area and want a second set of eyes on your numbers before you commit, that’s exactly the kind of conversation worth having before you sign.