The Overview I remember doing the coursework required to pass the Mortgage Loan Originator (MLO) Federal licensing exam and feeling my head spin as I encountered what seemed like hundreds of acronyms.

For homebuyers and sellers, as well as real estate agents, here are a few acronyms that should be understood, because they are commonly heard throughout the home buying process.

I’ve listed the Top 10 acronyms with a short description. Expect to hear these while you discuss financing with your MLO or real estate agent.

The Top 10 Most Commonly Used Mortgage Acronyms

DTI (Debt-to-Income Ratio): DTI is one of the basic measurements of your financial ability to repay your mortgage loan, and you’ll definitely hear your MLO use this term (especially if your DTI isn’t very strong).

And to add to the fun, DTI comes in 2 flavors: The Front-End DTI and the Back-End DTI.

The Front-End DTI (AKA Housing Ratio) is the simpler of the two and measures costs that focus on the housing itself. So, the cost of Principal, Interest, Tax, and Insurance (PITI) plus any HOA dues are added up and divided by your gross monthly income. We lenders prefer to see a Front-End DTI of around 28%.

The Back-End DTI (AKA Total Debt Ratio) is more comprehensive and is what most lenders focus on. It includes the proposed PITI payment plus all your other recurring monthly debts (credit card minimum payments, student loans, car loans, etc.), divided by your gross monthly income.

When working with a borrower, I’d like to see a Back-End DTI of 36% or less, although I’ve seen many cases where we were able to go beyond the 36% “max” Back-End DTI. At the end of the day, my industry exists to lend money, so we do try to be as flexible as possible.

PITI (Principal, Interest, Taxes, Insurance): The PITI is what you’ll actually pay each month for your mortgage loan. As you likely know, the mortgage loan consists of Principal as well as Interest on that Principal. Let’s do a quick Principal and Interest calculation on a fictitious mortgage:

Loan Amount: $400,000 / Term: 30 Year Fixed Conventional / Interest Rate: 6.5%

Total Monthly Principal and Interest Payment (Month 1) = $2,528.27

Principal = $361.60

Interest = $2,166.67

Yes, the Interest paid early in the loan is WAAAAAAAY more than the Principal. As the loan is paid over time, there comes a point (about 12-15 years into the loan) where the Principal payments are higher than the Interest. At that point, you’ll be paying more in Principal than Interest until the final payment.

In this case we take the $2,528.27 and add the Tax and Insurance to come up with the PITI. Taxes and Insurance costs are dependent on where you live.

My practice area is NY and NJ, specifically within a 100-mile radius of New York City. In my area, when you add Tax and Insurance to this example, you might be adding $1,200 for Tax and $150 for Insurance each month.

So, in our example, we would add the Principal and Interest of $2,528.27 plus the Tax of $1,200 and the Insurance of $150 for a grand total of $3,878.27 per month.

LTV (Loan-to-Value): The LTV is the percentage of a home’s value that is being financed with a mortgage loan. You’ve probably heard about having to put down 20% (FYI: You absolutely DO NOT have to put down 20%!) of the loan amount.

Here’s an example of what I mean by LTV. If the home has been appraised at $500,000, and you put down $100,000 (20%), then the LTV is 80%.

Using the same $500,000 from above, if you were to put down $17,500 (3.5% with an FHA loan), the LTV would be 96.5%.

We lenders prefer that you put down as much as you can because it reduces our risk that you’ll walk away from a loan where you have only put down a small amount. For lenders, the higher the LTV, the more risk we are taking on.

But a lower LTV (where you put down less than 20%) will cost you monthly mortgage insurance payments (until your LTV reaches 80%) as well as a higher interest rate.

For the borrower, a lower LTV is always better if they can afford to put down 20% or more.

FHA (Federal Housing Administration) Loan: FHA loans are mortgages insured by the Federal Housing Administration and are designed to make homeownership more accessible, especially for first-time or lower income buyers.

They allow for lower down payments as low as 3.5% (see the example above) and more flexible credit requirements compared to many conventional loans. Because the loan is insured by the government, lenders can offer easier qualification standards.

But you’ll have to pay Mortgage Insurance Premiums (MIP), which include both an upfront and monthly cost. And unlike conventional loans, the Monthly Insurance Premium will be paid for the life of the loan. It doesn’t end at 80% of LTV. You must refinance the loan to a conventional type to get rid of the MIP.

FHA loans are commonly used by buyers who may not qualify for conventional financing or who need a more flexible approval option. It can be a powerful way to get your foot into a property without waiting to save up a very large amount.

PMI (Private Mortgage Insurance): PMI is required on most conventional loans when a borrower puts down less than 20%. PMI protects the interests of the lender, not the borrower. As I mentioned earlier, when a loan’s down payment is less than 20%, the lender is at a higher risk that the borrower may default on the loan.

PMI will stay with the loan until your LTV drops to 80%. At that point, you can request that the lender drops the PMI. But, if you’ve been naughty and haven’t made payments on time, the lender can deny that request. However, once the LTV hits 78%, the lender has no choice but to drop the PMI. That’s the law!

VA (Mortgage Insurance Premium) Loan: VA loans are mortgage programs backed by the U.S. Department of Veterans Affairs and available to eligible Veterans, active-duty service members, and certain surviving spouses. Several of their biggest advantages are the ability to purchase a home with no down payment and no private mortgage insurance.

VA loans also typically offer competitive interest rates and more flexible credit guidelines than many conventional options. At the time of writing this article (12/18/25), the average 30-year fixed interest rate is 6.22%, while the average VA 30-year fixed interest rate is 5.87%. That’s a difference of .35% in interest rate.

There is also no down payment necessary (VA loans can be 100% LTV), but a funding fee of 2.15% of the loan amount is required. That funding fee can be rolled into the loan.

If you are a Veteran, or a certain category of Veteran spouse (check the VA’s website or Google search) you may qualify for this amazing loan program.

As a Veteran myself, I’ve used the VA loan in my own home buying activity.

APR (Annual Percentage Rate): The APR (you can find the APR in the Loan Estimate that you’ll receive from your lender within 3 business days of application) represents the true cost of borrowing over the life of a mortgage.

Unlike the interest rate, APR includes both the rate and certain lender fees, such as origination charges and discount points, expressed as a single percentage. APR helps borrowers compare loan offers more accurately.

A lower interest rate does not always mean a lower APR if higher fees are involved. While APR is a useful comparison tool, it should not be used to calculate monthly payments.

So, if you have a mortgage interest rate of 6.25%, that is the rate used to calculate your monthly payment, not the APR of 6.47% (for example).

When you shop your loan (which you should), make sure that you compare the APRs between the lenders. While the interest rates may be equal, the APR will show you the true cost with fees.

LE (Loan Estimate): is a standardized disclosure lenders must provide to you within three business days of when you’ve applied for a mortgage. It shows the APR (we just discussed) estimated loan terms, interest rate, monthly payment, and closing costs.

The Loan Estimate allows you to compare offers from different lenders using the same format. While the numbers are estimates, certain fees are subject to tolerance limits and cannot increase beyond allowed thresholds.

Reviewing the LE carefully can help you understand cash needed at closing and avoid surprises later in the process. It is one of the most important documents borrowers receive early in the mortgage process.

CD (Closing Disclosure): The CD is the final document you’ll receive before closing on a mortgage. It provides a detailed breakdown of the loan’s final terms, interest rate, monthly payment, and all closing costs.

By law, the CD must be delivered at least three business days before signing, giving you time to review the numbers. You should always compare the CD to the earlier Loan Estimate to confirm accuracy.

Any significant changes can trigger a new waiting period. Reviewing the CD carefully helps prevent last-minute surprises and ensures a smooth closing.

You might be surprised at how many loans are held up because issues were only found at the last minute. Always compare your Closing Disclosure to the Loan Estimate as soon as you receive it!

ARM (Adjustable-Rate Mortgage): The ARM is a type of home loan where the interest rate is fixed for an initial period and then adjusts periodically based on a market index. Common examples include 5/1 or 7/1 ARMs, where the rate is fixed for five or seven years before adjusting annually.

ARMs often start with lower interest rates than 30-year fixed loans, which can reduce initial monthly payments. After the fixed period ends, the rate can increase or decrease, subject to caps that limit movement of the payment. For example, today’s (12/18/25) average rate on a 30-year fixed is 6.22%, while a 7/6 ARM is 5.80%.

Once I understand the goals of a buyer, I may recommend an ARM for buyers who plan to sell or refinance before the adjustment period begins.

Additionally, we will not make an ARM loan without calculating your ability to repay the loan at its highest possible interest rate. This is a requirement under the law, as many unqualified borrowers took ARMs in the real estate crash between 2007-2009 and were unable to make payments as the loans adjusted.

Takeaways

These are the Top 10 acronyms you’re extremely likely to hear when working with your real estate agent and Mortgage Loan Originator.

It’s a good idea to pay attention to the financing aspect of your home buying journey, and you can learn a lot by subscribing to this newsletter (It’ll ALWAYS be free of charge).

I know that shopping for a home is sexy and exciting, but the finance part is sexy, too.