Mortgage Glossary — Key Terms Explained

Whether you’re buying your first home or refinancing an existing loan, mortgage terminology can feel overwhelming. This glossary was created to help you navigate the language of home financing with confidence. Each term is explained in plain English, so you can make informed decisions at every step of the process.

From foundational concepts like principal and interest rate to more complex topics like underwriting and loan-to-value ratio, you’ll find clear, concise definitions below. Use this resource alongside our free Mortgage Calculator and other financial tools to plan your home purchase or refinance with clarity.

Mortgage Glossary A–Z

Amortization

Amortization is the process of paying off a loan through regular, scheduled payments over time. Each payment covers both interest and a portion of the principal balance. In the early years of a mortgage, most of your payment goes toward interest; over time, a larger share reduces the principal. A standard 30-year fixed mortgage is fully amortized by the final payment.

APR — Annual Percentage Rate

The Annual Percentage Rate (APR) represents the true annual cost of borrowing money, including not just the interest rate but also lender fees, points, and other charges. It gives you a more complete picture of a loan’s cost than the interest rate alone. Use our APR Calculator to compare loan offers and find the most affordable option.

Appraisal

A home appraisal is a professional assessment of a property’s market value conducted by a licensed appraiser. Lenders require an appraisal before approving a mortgage to ensure the loan amount doesn’t exceed the home’s fair market value. If the appraisal comes in lower than the purchase price, you may need to renegotiate, increase your down payment, or walk away from the deal.

Closing Costs

Closing costs are the fees and expenses paid when a real estate transaction is finalized. They typically range from 2% to 5% of the loan amount and can include appraisal fees, title insurance, attorney fees, origination fees, prepaid taxes, and homeowner’s insurance premiums. Some costs are paid by the buyer, others by the seller, depending on the negotiated agreement.

Conventional Loan

A conventional loan is a mortgage not backed by a government agency such as the FHA or VA. These loans conform to guidelines set by Fannie Mae and Freddie Mac and typically require a higher credit score and larger down payment than government-backed loans. They often offer competitive interest rates for borrowers with strong credit profiles.

Credit Score

A credit score is a three-digit number (typically between 300 and 850) that reflects your creditworthiness based on your borrowing and repayment history. Lenders use your credit score to assess risk and determine your mortgage interest rate. Generally, a score of 740 or above qualifies for the best rates, while scores below 620 may limit loan options or result in higher costs.

Debt-to-Income Ratio (DTI)

The Debt-to-Income (DTI) ratio compares your total monthly debt payments to your gross monthly income. Lenders use it to evaluate your ability to manage monthly mortgage payments. Most conventional lenders prefer a DTI below 43%, though some loan programs allow higher ratios. Calculate yours with our free DTI Calculator.

Down Payment

A down payment is the upfront cash amount you pay toward the purchase price of a home. It represents the difference between the purchase price and the loan amount. Conventional loans typically require 5–20% down, while FHA loans allow as little as 3.5%. A larger down payment can reduce your monthly payment, eliminate PMI requirements, and lower your interest rate. Use our Down Payment Calculator to plan accordingly.

Escrow

Escrow refers to a neutral third-party account that holds funds during a real estate transaction until all conditions of the purchase agreement are met. After closing, your lender may maintain an escrow account to collect monthly contributions for property taxes and homeowner’s insurance, paying those bills on your behalf when they come due.

FHA Loan

An FHA loan is a government-backed mortgage insured by the Federal Housing Administration. These loans are popular among first-time homebuyers because they allow lower credit scores (as low as 580) and down payments as low as 3.5%. In exchange, borrowers must pay mortgage insurance premiums (MIP) for the life of the loan in most cases.

Fixed-Rate Mortgage

A fixed-rate mortgage has an interest rate that remains constant for the entire life of the loan, making monthly principal and interest payments predictable. Common terms are 15 and 30 years. Fixed-rate loans are ideal for buyers who want stability and plan to stay in the home long-term, especially when interest rates are low.

Home Equity

Home equity is the portion of your home’s value that you own outright — calculated as the current market value minus the remaining mortgage balance. Equity grows as you make mortgage payments and as your home appreciates in value. It can be accessed through a home equity loan or HELOC for major expenses. Use our Home Equity Calculator to estimate your current equity.

Home Inspection

A home inspection is a comprehensive visual examination of a property’s condition conducted by a licensed inspector before closing. It covers the roof, foundation, HVAC systems, plumbing, electrical, and more. While not required by lenders, a home inspection is strongly recommended — it can reveal costly problems and give buyers negotiating power or a basis to walk away.

HOA — Homeowners Association

A Homeowners Association (HOA) is an organization in a planned community, condominium, or subdivision that sets rules for properties and enforces community standards. HOA fees are mandatory and paid monthly or annually; they cover shared amenities and maintenance. Lenders factor HOA fees into your DTI calculation, so they can affect how much home you can afford.

Interest Rate

The interest rate is the percentage of the loan balance charged annually by the lender for borrowing money. Unlike APR, the interest rate does not include additional fees. It is one of the most important factors in determining your monthly mortgage payment and the total cost of your loan over time. Even a 0.5% difference in rate can translate to tens of thousands of dollars over a 30-year mortgage.

LTV — Loan-to-Value Ratio

The Loan-to-Value (LTV) ratio compares the loan amount to the appraised value of the property. For example, borrowing $180,000 on a $200,000 home results in a 90% LTV. Lenders use LTV to assess risk — a higher LTV means more risk, which may require PMI or result in a higher interest rate. Most conventional loans require an LTV of 80% or below to avoid PMI.

Mortgage

A mortgage is a loan used to purchase or refinance real estate, where the property itself serves as collateral. If the borrower fails to make payments, the lender can foreclose on the property. Mortgages consist of principal, interest, taxes, and insurance (PITI). Use our Mortgage Calculator to estimate your monthly payments based on loan amount, term, and rate.

Mortgage Insurance (PMI)

Mortgage insurance protects the lender — not the borrower — in case of default. Private Mortgage Insurance (PMI) is typically required on conventional loans when the down payment is less than 20%. FHA loans require their own form of mortgage insurance called MIP. PMI can usually be removed once your LTV reaches 80% through payments or home appreciation.

Points (Discount Points)

Mortgage points, also called discount points, are upfront fees paid to the lender at closing in exchange for a lower interest rate. One point equals 1% of the loan amount. Paying points makes sense if you plan to stay in the home long enough to recoup the upfront cost through lower monthly payments. A break-even analysis can help determine if buying points is worthwhile.

Pre-Approval

A mortgage pre-approval is a lender’s conditional commitment to lend you a specific amount, based on a thorough review of your finances including credit score, income, assets, and debts. Pre-approval is stronger than pre-qualification and signals to sellers that you’re a serious, qualified buyer. It typically results in a written letter valid for 60–90 days.

Pre-Qualification

Pre-qualification is an informal estimate of how much you may be able to borrow, based on basic information you provide about your income, debts, and assets — without a hard credit pull. It’s a quick first step in the home buying process and helps set expectations, but it carries less weight with sellers than a formal pre-approval.

Principal

The principal is the original loan amount borrowed, or the remaining balance still owed on the loan. Each monthly mortgage payment reduces the principal balance. As the principal decreases over time through amortization, the interest portion of each payment also decreases. Making extra principal payments can significantly shorten your loan term and reduce total interest paid.

Private Mortgage Insurance (PMI)

Private Mortgage Insurance (PMI) is a type of insurance required by lenders when a borrower’s down payment on a conventional loan is less than 20% of the home’s purchase price. PMI costs typically range from 0.2% to 2% of the loan amount per year. Once your equity reaches 20%, you can request PMI cancellation. See also: Mortgage Insurance.

Rate Lock

A rate lock is a lender’s guarantee that your mortgage interest rate will remain fixed for a specified period — typically 30 to 60 days — while your loan is processed. This protects you from rate increases between application and closing. Some lenders offer float-down options that allow you to benefit if rates drop during the lock period, sometimes for an added fee.

Refinancing

Refinancing means replacing your existing mortgage with a new loan, typically to secure a lower interest rate, change the loan term, or access home equity through a cash-out refinance. It can lower monthly payments or reduce total interest costs, but involves closing costs that must be weighed against the savings. Use our Refinancing Calculator to see if it makes financial sense for you.

Second Mortgage

A second mortgage is an additional loan taken out on a property that already has a primary mortgage. It is subordinate to the first mortgage, meaning the primary lender is paid first if the property is foreclosed. Common types include home equity loans and HELOCs. Second mortgages typically carry higher interest rates than first mortgages due to the increased lender risk.

Short Sale

A short sale occurs when a homeowner sells their property for less than the outstanding mortgage balance, with the lender’s approval. It is typically pursued as an alternative to foreclosure when the borrower can no longer afford payments and owes more than the home is worth. Short sales can negatively impact credit scores but are generally less damaging than a foreclosure.

Title Insurance

Title insurance protects homeowners and lenders against financial losses arising from defects in a property’s title — such as unpaid liens, errors in public records, or undisclosed heirs with ownership claims. There are two types: lender’s title insurance (required by most lenders) and owner’s title insurance (optional but highly recommended). It’s a one-time premium paid at closing.

Underwater Mortgage

An underwater mortgage (also called being “upside-down” on a loan) occurs when the outstanding loan balance is greater than the current market value of the home. This can happen when property values decline significantly after purchase. Homeowners who are underwater cannot sell the property without a short sale unless they make up the difference in cash, and refinancing options are also limited.

Underwriting

Underwriting is the process by which a lender evaluates the risk of offering a mortgage to a borrower. The underwriter reviews your credit history, income, employment, assets, and the property’s appraisal to determine whether the loan meets the lender’s guidelines. Underwriting can result in loan approval, a conditional approval requiring additional documentation, or a denial.

VA Loan

A VA loan is a mortgage guaranteed by the U.S. Department of Veterans Affairs, available to eligible veterans, active-duty service members, and surviving spouses. VA loans offer significant benefits including no down payment required, no private mortgage insurance, competitive interest rates, and limited closing costs. They are one of the most powerful home financing tools available to those who qualify.

Variable Rate (Adjustable-Rate Mortgage)

A variable-rate mortgage, also known as an Adjustable-Rate Mortgage (ARM), has an interest rate that changes periodically based on a market index (such as SOFR). ARMs typically start with a lower fixed rate for an initial period (e.g., 5 or 7 years), then adjust annually. They can offer savings in the short term but carry the risk of higher payments if rates rise.

Frequently Asked Questions

Q: What is the difference between APR and interest rate?
The interest rate is the base cost of borrowing the loan principal. The APR includes the interest rate plus lender fees and other costs, giving a more complete picture of the loan’s true annual cost. Use the APR when comparing mortgage offers from different lenders.

Q: How much of a down payment do I need to buy a house?
The minimum down payment depends on the loan type: FHA loans require as little as 3.5%, conventional loans can start at 3–5%, and VA and USDA loans may require no down payment at all. A 20% down payment eliminates the need for PMI on conventional loans.

Q: What is a good DTI ratio for a mortgage?
Most lenders prefer a total debt-to-income ratio below 43% for conventional loans, though some programs allow up to 50%. A lower DTI demonstrates stronger financial health and improves your chances of loan approval at favorable rates. Use our DTI Calculator to check yours.

Q: When does PMI go away?
On conventional loans, PMI is automatically canceled when your loan balance reaches 78% of the original purchase price (based on your scheduled payment plan). You can also request cancellation when your LTV hits 80%, either through payments or a new appraisal showing increased home value. FHA MIP follows different rules and may last the life of the loan.

Q: What does it mean to refinance a mortgage?
Refinancing means taking out a new mortgage to replace your existing one, usually to get a lower interest rate, shorten the loan term, or access equity (cash-out refinance). It involves closing costs similar to your original purchase, so it’s important to calculate the break-even point. Our Refinancing Calculator can help you decide if it’s the right move.