Debt Metrics Explained: LTV, LTC, DSCR, and the Loan Constant

Book: Real Estate by the Numbers: A Complete Reference Guide to Deal Analysis Authors: J Scott and Dave Meyer Chapters: 31-32

← Debt Financing and How Loans Work | Understanding Leverage in Real Estate Investing →

Now that we understand how loans are structured (from the last post), it’s time to learn the metrics that lenders and investors use to evaluate them. These four metrics come up constantly in real estate conversations and loan applications. If you don’t know them, you’re at a disadvantage.

Chapters 31 and 32 cover: loan-to-value ratio, loan-to-cost ratio, debt service coverage ratio, and the loan constant.

Loan-to-Value Ratio (LTV)

LTV answers a simple question: what percentage of a property’s value does the loan cover?

Formula:

LTV = Loan amount / Property value

For example, if Luis buys a home valued at $300,000 and takes out a $240,000 mortgage:

LTV = $240,000 / $300,000 = 80%

That means Luis borrowed 80 percent of the property’s value and put 20 percent down as equity.

Why LTV Matters

Lenders care about LTV a lot. It tells them how much cushion they have. If the borrower stops paying and the bank has to foreclose and sell the property, a lower LTV means the bank is more likely to get its money back.

Here’s how LTV affects the loan:

• LTV at or below 80 percent: Best interest rates. No private mortgage insurance (PMI) required.
• LTV above 80 percent: Higher rates, and the lender may require PMI. PMI protects the bank if you default, but it comes out of your pocket.
• LTV up to 97 percent: The upper limit for most conventional loans. Some FHA loans allow this.
• LTV at 100 percent: Rare. Hard-money or private lenders sometimes allow this on strong deals.

As an investor, knowing LTV helps you understand what kind of loan you can get and what it will cost.

Loan-to-Cost Ratio (LTC)

LTC is similar to LTV, but it compares the loan amount to the total cost of the project, not just the purchase price. This matters most when you’re doing a renovation or building something new.

Formula:

LTC = Loan amount / All-in costs

Example: You want to build a duplex. The land costs $150,000 and construction will cost $350,000, for a total of $500,000. The lender agrees to fund $400,000. You bring the other $100,000 as a down payment.

LTC = $400,000 / $500,000 = 80%

The lender is covering 80 percent of your total project cost.

Why LTC Matters

Lenders use LTC to make sure the borrower has real skin in the game. If someone is funding 100 percent of a project, they have nothing to lose if it fails. That’s bad for the lender. By capping LTC, lenders ensure the borrower has something at risk.

The higher the LTC, the riskier the loan from the lender’s perspective. Most construction lenders want to see you contribute a meaningful amount of your own money to the project.

Debt Service Coverage Ratio (DSCR)

DSCR answers a different kind of question: can the property generate enough income to cover its loan payments?

Formula:

DSCR = Net operating income (NOI) / Total debt service (TDS)

NOI is revenue minus operating expenses (not including the mortgage payment). Total debt service is how much you pay on the loan in a year.

Example: Jose is looking at a property with $30,000 per year in NOI. His annual mortgage payments are $24,000.

DSCR = $30,000 / $24,000 = 1.25

How to Read DSCR

• DSCR = 1.0: Break even. The property’s income covers the loan exactly, with nothing left over.
• DSCR > 1.0: Positive cash flow. The higher, the more cushion.
• DSCR < 1.0: The income doesn’t cover the debt. The investor has to cover the gap out of pocket every month.

Most commercial lenders require a DSCR of at least 1.2 to 1.3. That gives a cushion in case income dips or expenses rise.

DSCR is useful for you as an investor too. It’s a quick way to compare properties. A property with a DSCR of 1.5 has more breathing room than one with a DSCR of 1.1, even if the higher-DSCR property has lower total NOI.

Here’s a quick illustration:

Property 1 has higher NOI, but Property 2 has better cash flow prospects relative to its debt load. The DSCR makes that clear at a glance.

The Loan Constant

The loan constant is a metric that many investors haven’t heard of, but it’s one of the most useful in the toolkit. It tells you the true annual cost of a loan as a percentage of the loan amount.

Formula:

Loan constant = Annual debt service / Loan amount

Example: A 20-year loan of $100,000 at 6 percent. Monthly payment is about $716. Annual payments are about $8,597.

Loan constant = $8,597 / $100,000 = 8.6%

Notice that 8.6 percent is higher than the 6 percent interest rate. That’s normal and expected. The loan constant is always higher than the interest rate for a fully amortizing loan because the payments also include principal paydown.

What the Loan Constant Tells You

Think of the loan constant as the return the lender is earning on the loan. The higher the loan constant, the more of your deal’s income is flowing to the lender.

This makes it a useful comparison tool. If you’re choosing between multiple loan options, the one with the lower loan constant costs you less, regardless of the stated interest rate.

The loan constant is also useful for prioritizing debt payoff. If you have multiple loans, focus on paying off the ones with the highest loan constants first. That’s where the money is leaking fastest.

Breakeven Loan Value

Here’s one of the practical applications. The loan constant can help you figure out the maximum loan you can take on a property before cash flow turns negative.

Formula:

Breakeven loan value = NOI / Loan constant

Example: A property with an 8 percent cap rate and a purchase price of $100,000. NOI is $8,000. The loan is a 15-year, 6 percent fixed rate, with a loan constant of about 10.13 percent.

Breakeven loan value = $8,000 / 10.13% = $78,973

That number is the maximum you can borrow. Borrow less than $78,973 and you’ll have positive cash flow. Borrow more and cash flow goes negative.

This is a really handy check before committing to a loan. You know the number before you sign.

Using the Loan Constant to Estimate Cap Rates

One more interesting use. In commercial real estate, it can be hard to find reliable cap rate data for a specific market. The loan constant offers an indirect way to estimate.

Here’s the idea. Survey local lenders to find the typical loan terms (interest rate, amortization period, LTV). Calculate the loan constant. Survey local investors to find what cash-on-cash return they require. Then weigh those two numbers using the typical LTV ratio.

For example, if typical commercial loans in a market have a loan constant of 7.73 percent at 75 percent LTV, and investors expect 15 percent cash-on-cash return:

Estimated cap rate = (75% × 7.73%) + (25% × 15%) = 9.55%

Not a perfect number, but it gives you a starting point when direct cap rate data is hard to come by.

Loan Constant Limitations

A quick note: the loan constant works best for fixed-rate, fully amortizing loans. For adjustable-rate loans or interest-only loans, it becomes less reliable. If the rate changes, so does the loan constant. For adjustable loans, the book recommends calculating the loan constant using the highest possible rate to get a conservative estimate.

Here’s the Big Picture

These four metrics tell you different things about a loan:

• LTV tells you how much of the property value the loan covers. Affects your rate and whether you need PMI.
• LTC tells you how much of the total project cost the loan covers. Used for construction and rehab deals.
• DSCR tells you whether the property can cover its debt payments. Critical for cash flow analysis.
• Loan constant tells you the annual cost of the loan as a percentage of the balance. Helps compare loans and find your cash flow breakeven point.

These are the lenses lenders use when deciding whether to make a loan. Understanding them helps you see through those same lenses and put together a stronger application, and pick better loans.

← Debt Financing and How Loans Work | Understanding Leverage in Real Estate Investing →