Cap Rate vs. Note Yield: Why the Landlord's Favorite Number Can Mislead You

Ask a rental investor how good a deal is and you will hear one number: the cap rate. It is the metric on every listing, every podcast, every back-of-the-napkin pitch. It is also a number that flatters the landlord and quietly buries the parts of owning property that actually cost you.

When you own the loan instead of the building, the math works differently, and cleaner. Here is what the cap rate really measures, where it misleads, and how the yield on a mortgage note compares.

What a cap rate actually measures

Cap rate is simple: net operating income divided by the price of the property.

Net operating income, or NOI, is the rent left over after operating expenses like taxes, insurance, and upkeep, but before any financing. So a $100,000 property that throws off $7,000 of NOI has a 7% cap rate. Buy it in cash and, on paper, you are earning 7% a year.

It is a clean way to compare buildings. The problem is not the formula. The problem is what gets left out of that middle number.

Where the cap rate quietly lies

NOI is an optimist. In the real world it tends to skip or shrink the costs that hit you hardest:

• True vacancy. The pro forma assumes a tenant almost always in place. Turnovers, evictions, and slow months say otherwise.
• Capital expenditures. A roof, an HVAC system, a full turn between tenants. These are not in NOI, but they are absolutely in your bank account when they hit.
• Real management. Whether you pay a manager or do it yourself at midnight, that time and cost is worth something. NOI usually lowballs it.

Add those back and the 7% on the listing often becomes 4% or 5% in your pocket. And the cap rate says nothing at all about the biggest line item of being a landlord: you own every problem the building has, forever.

A cap rate is what the deal looks like before reality shows up. Your real return is what survives after it does.

The note investor's version of a cap rate

When you buy the mortgage note instead of the house, you are the bank. You do not have NOI, because you do not have operations. You have a borrower who owes you money and a piece of real estate securing it.

Your equivalent of a cap rate is the yield on your basis: the interest the borrower pays divided by what you actually paid for the note. Two things make that number behave better than a landlord's:

• The borrower carries the property costs. Taxes, insurance, the roof, the tenant drama. That is the homeowner's job, not yours. The costs that eat a cap rate are simply not on your side of the ledger.
• You often buy at a discount. Notes frequently trade below the loan balance, so your yield is calculated on a smaller basis than the debt that is actually owed to you.

Same $100,000, two ways

Picture the same capital deployed both ways.

As a landlord: you buy the 7% cap property. After honest vacancy, reserves, and management, you are keeping something closer to 4% to 5% in cash, and you are on call for every repair and every tenant.

As the lender: you buy performing mortgage paper, often at a discount to the balance. The borrower keeps paying taxes, insurance, and upkeep on their own home. Your yield is the interest on your basis, with none of the operating drag that quietly shaved points off the landlord's number.

The point is not a magic figure. It is the structure. The landlord's headline number leaks on the way to the bank account. The lender's does not have as far to fall.

The numbers above are illustrative, meant to show how the two structures behave. They are not a projection, a guarantee, or an offer, and any real return depends on the specific note and borrower.

What you give up as the lender

This is not free money, and pretending otherwise would be doing you a disservice. As the note holder you trade a few things:

• Appreciation. You are not betting on the house going up in value. Your return is the yield plus getting your principal back. Buying at a discount builds in a cushion, but the runaway upside of a hot market belongs to the owner, not the lender.
• Control. You do not decide when to renovate or refinance. The borrower runs the property.
• Default risk. A borrower can stop paying. Then you are into a workout or a foreclosure, which takes time and money, though a real house still backs the loan the whole way.

So it is a different risk profile, not a free lunch: contractual income secured by real estate, instead of operational income you have to manufacture month after month.

How to sanity-check either deal

You do not need a fancy spreadsheet to dodge the trap. A few honest questions do most of the work.

On a rental, do not stop at the cap rate. Knock the NOI down for real vacancy, set aside a true reserve for big-ticket repairs (a rough rule: assume the roof, the HVAC, and a full turnover are all coming eventually), and pay yourself or a manager for the actual work. The number that survives that haircut is your real return. If it still clears your bar, great.

On a note, ask three things. Is the borrower actually paying, and for how long? What is the property worth today versus what you are paying for the note? And what is your plan if the payments stop? A performing note bought below the value of the house behind it, with a clear plan for a workout, is a very different animal from a cheap note on a home worth less than the loan.

Same discipline, two seats. One just has fewer ways to surprise you after you sign.

When the note wins

If you want to bet on a specific building appreciating and you enjoy running property, the landlord seat can be the right one. But if what you actually want is real-estate-backed income without the toilets, tenants, and turnover, the note math is simply cleaner. Fewer leaks between the headline number and your bank account.

Cap rate is the landlord's favorite number because it looks great on a listing. Yield on a note is the lender's number because it holds up after reality arrives. Know which one you are actually buying.

AJ Dent is the founder of Take Notes Capital, a mortgage note investing firm specializing in non-performing notes. Book a free strategy call.