The Hidden Consequence of Cash Purchases
Will Koenig • December 9, 2025
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Did you know that if an investment property doesn’t have a mortgage in place within 90 days of closing,
the ability to deduct mortgage interest disappears permanently?*
Do you understand how placing a loan on a rental can raise returns?
Many Real Estate investors don’t. And it quietly costs them.
Here’s a client I helped this week:
He found a turnkey Edmond rental for $105K, about $50K under market and already cash-flowing.
His instinct: “Let’s pay cash and own it outright.”
Familiar thinking.
But once we thought through the tradeoffs, a different picture emerged.
Scenario A: Pay Cash
Capital in: $105K
Cash flow: about $1,000/mo
Cash-on-cash: 11%
What he gives up:
• Liquidity. Every dollar is locked in one asset.
• Mortgage-interest deductibility after the 90-day window. This is a permanent loss for the lifetime the property is owned.*
• This means higher taxable rental income for the life of the property.
• Leverage, which is the main engine behind real estate’s superior returns.
Scenario B: Finance It
Capital in: about $30K
Loan: $75K
Cash flow: about $500/mo
Cash-on-cash: 28%
What he gains:
• $75K of available capital for additional opportunities.
• Thirty years of deductible interest.
• The same appreciation, tenant, and operating profile.
• A stronger overall return with far better flexibility.
Why this matters:
Same property. Same rent.
At the end of the day, the property wasn’t the biggest win.
The financing structure was.
The funding choice determines its investment performance.
And these same principles apply to Real Estate investments regardless of the price or location.
Which leads to the question I now ask every investor who wants to pay cash:
“If you owned this property free and clear, would you borrow $75K against it to buy more discounted rentals?”
What would it do for you and your clients if someone could help optimize their Real Estate investments while you focus on AUM?
Think of it as a free tune-up for RE investments.
*The 90-Day Rule
If a loan isn’t in place within 90 days of closing, mortgage interest on that property will never be deductible.
A later refinance doesn’t fix it.
Few investors know this, and the tax cost compounds for decades.
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For decades, most mortgage lending has relied on Classic FICO.
Classic FICO gives lenders a snapshot of your credit at one point in time. It looks at things like payment history, balances, length of credit, credit mix, and recent credit activity.
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On one hand, you may have a mortgage rate that’s far lower than today’s market rates. Giving that up can feel like a mistake.
Homeownership is not just about getting the keys.
It is about caring for the place you live, protecting the investment you made, and making smart financial decisions along the way. At NEO Home Loans, we believe successful homeownership is built one month at a time through education, planning, and proactive support.
Do we make an offer and hope everything works out?
Do we wait and risk losing the home?
Do we rush our current home onto the market?
Unfortunately, this is where many homeowners find themselves.
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You want to buy your next home…
But you feel like you have to sell your current one first.
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But that may not be the best question.
A better question could be:
What will this same payment feel like 10 years from now?
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For the past few years, sellers had all the control. Homes sold fast. Buyers competed aggressively. And negotiating power was almost nonexistent.
That’s no longer the case.
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But there’s a challenge most buyers don’t realize until it’s too late.
