The Mortgage Glossary, Simplified: The Terms You'll Meet, and Which Loan Fits Whom

Mortgage paperwork comes with its own vocabulary, and a lot of it is used loosely, even by the people selling you the loan. This guide does two jobs. First, a map of the main loan types and who each one tends to fit. Second, a plain-English glossary of the terms you'll see on a Loan Estimate, a Closing Disclosure, and in a lender's pitch. Most definitions below come from the Consumer Financial Protection Bureau (CFPB), the Federal Housing Finance Agency (FHFA), HUD, VA, and USDA, and each is linked in the sources.

The loan types at a glance

Think of a mortgage as three choices stacked together: who backs the loan (conventional or a government program), how the rate behaves (fixed or adjustable), and how long it lasts (commonly 15 or 30 years). The table covers the first choice.

Two details on FHA are worth knowing. First, HUD's premium notice (Mortgagee Letter 2023-05, effective March 2023) lists an upfront mortgage insurance premium of 1.75% of the base loan amount, plus an annual premium of 0.50% to 0.55% for most 30-year loans at or under $726,200. On loans with less than 10% down, the annual premium lasts for the life of the loan, versus 11 years for loans with 10% or more down. Premium schedules can change, so confirm current rates with a lender. Second, in an October 8, 2026 notice (Mortgagee Letter 2026-11), HUD said that for FHA case numbers assigned on or after January 1, 2027, it will add FICO 10T and VantageScore 4.0 credit models alongside classic FICO. The score thresholds above are unchanged.

How the rate behaves, and how long it lasts

An ARM's name often includes two numbers, like 5/1. The first is typically how many years the rate stays fixed, and the second describes how often it adjusts after that, so ask the lender for the exact schedule. After the fixed period, your rate is the index plus the margin, subject to rate caps. CFPB says the initial adjustment cap is commonly two or five percentage points, the cap on each later adjustment is commonly one or two, and the lifetime cap is most commonly five. For example, a 2/2/5 ARM starting at 6% could move to 8% at its first adjustment, by up to 2 points at each later one, and never above 11%.

Which loan fits which situation

There is no best loan in the abstract, only a best fit for a particular buyer. Treat this as a starting map, then get quotes.

CFPB's advice for comparison shopping is to choose the type of loan first so every lender quotes the same product. It also suggests estimating the shortest, most likely, and longest time you'll keep the loan, then comparing total costs across those periods.

Three calculations worth knowing

The paperwork timeline

• Preapproval. A lender's letter stating roughly how much it's willing to lend. CFPB says lenders don't use the terms prequalification and preapproval consistently, and neither letter is a guaranteed loan offer.
• Loan Estimate. The lender must give you this within three business days of receiving your application. It shows the estimated rate, monthly payment, and closing costs.
• Rate lock. Locks are typically available for 30, 45, or 60 days, and sometimes longer. Extending one may be expensive.
• Closing Disclosure. The lender must give you this at least three business days before closing. Compare it line by line with the Loan Estimate.

The glossary, A to Z

• Adjustable-rate mortgage (ARM). A loan whose rate is fixed for an initial period and then changes with the market. See also index, margin, and rate cap.
• Amortization. Paying off a loan through regular payments that shrink what you owe over time. In a 30-year loan, early payments are mostly interest and later payments are mostly principal.
• Annual percentage rate (APR). A broader measure of what a loan costs than the interest rate. It includes points, broker fees, and other charges, so it is usually higher than the interest rate.
• Appraisal. An independent assessment of a home's value. The lender usually picks the appraiser.
• Balloon payment. A large lump sum due at the end of a loan. Qualified mortgages generally don't allow them, with exceptions for certain small lenders.
• Closing costs. All the costs you pay at closing, including origination charges, appraisal and credit report fees, and title insurance fees. They're summarized on the Loan Estimate.
• Closing Disclosure. A five-page form with the final loan terms, projected monthly payments, and total fees. You get it at least three business days before closing.
• Conforming loan. A conventional loan within the size limit set by FHFA. For 2026 that is $832,750 for one-unit properties in most of the country, and up to $1,249,125 in high-cost areas.
• Conventional loan. Any mortgage that isn't insured or guaranteed by the government.
• Debt-to-income ratio (DTI). Your total monthly debt payments divided by your gross monthly income. Lenders use it to judge whether you can handle a new payment.
• Discount points. Upfront fees you pay at closing in exchange for a lower rate. One point equals 1% of the loan amount.
• Escrow. An account the lender sets up to pay your property taxes and homeowner's insurance, funded by part of each monthly payment.
• FHA loan. A loan insured by the Federal Housing Administration, with down payments as low as 3.5% and required mortgage insurance.
• Fixed-rate mortgage. A loan where the interest rate and principal-and-interest payment don't change for the life of the loan.
• Funding fee (VA). A one-time fee on VA-backed loans. VA says it helps lower the loan's cost for taxpayers, since VA loans require no down payment or monthly mortgage insurance. The rate depends on your down payment and whether it's your first use of the benefit, and some borrowers are exempt.
• Home equity line of credit (HELOC). An open-end line of credit you can borrow against repeatedly, using the equity in your home. It usually has a variable rate, and your home backs it, so you could lose the home if you can't repay.
• Home Equity Conversion Mortgage (HECM). The most common reverse mortgage, available only to homeowners 62 and older. You make no monthly mortgage payment, but interest and fees are added to the balance.
• Index and margin. On an ARM, the index is a market interest rate that moves, and the margin is a number your lender adds to it. Index plus margin is your rate, subject to caps.
• Interest-only loan. A loan with a period where you pay only interest and none of the principal. CFPB lists it among features that can surprise borrowers later, and qualified mortgages don't allow it.
• Jumbo loan. A non-conforming loan above the conforming limit. Lenders set their own rules, and they usually want good credit and a high down payment.
• Lender credits. Money that lowers your closing costs up front, in exchange for a higher interest rate. They show up as a negative number on the Loan Estimate.
• Loan Estimate. A three-page form the lender must give you within three business days of your application.
• Loan-to-value ratio (LTV). The loan amount divided by the home's appraised value. A larger down payment lowers it. Lenders use it to decide whether to lend and whether to require mortgage insurance.
• Mortgage insurance premium (MIP). The mortgage insurance on FHA loans, usually with an upfront and an annual component. CFPB says it's required on every FHA loan.
• Negative amortization. When payments are smaller than the interest due, so the balance grows even though you're paying. Qualified mortgages don't allow it.
• Nonqualified mortgage. A loan that doesn't meet qualified-mortgage standards. CFPB's loan-types guide says these are sometimes marketed to self-employed borrowers or borrowers without Social Security numbers, and can be riskier or more expensive.
• Origination fee. What the lender charges for making the loan. It can cover application processing, underwriting and funding, and administrative services.
• PITI. Principal, interest, taxes, and insurance: the four basic parts of a monthly mortgage payment.
• Preapproval / prequalification. Letters stating how much a lender is generally willing to lend. Lenders use the terms inconsistently, and neither is a guarantee.
• Prepayment penalty. A fee for paying a loan off early. CFPB tells borrowers to check for it.
• Principal. The amount you borrowed and still owe, not counting interest.
• Private mortgage insurance (PMI). Insurance that protects the lender, typically required on a conventional loan with less than 20% down. You can ask to cancel it at 80% of the home's original value, and it must end automatically at 78% if you're current on payments.
• Qualified mortgage. A loan with less risky features and protections, meant to make it more likely you can afford it. It can't have interest-only periods, negative amortization, or terms longer than 30 years, and balloon payments are allowed only in limited cases. FHA, VA, and USDA loans all qualify.
• Rate cap. A limit on how much an ARM's rate can change at the first adjustment, at each later adjustment, and over the life of the loan.
• Rate lock. A lender's promise that your rate won't change between the offer and closing, as long as you close in the stated window and your application doesn't change.
• Refinance. Replacing your mortgage with a new one. CFPB says refinancing is never guaranteed, since falling income or home values, or rising rates, can prevent it or erase its benefit.
• Underwriting. The lender's review of your income, assets, debts, credit, and the property before it approves the loan.

A note on today's rates

Rates move weekly, and this guide doesn't try to track them. For where the 30-year average stands and what it does to a payment, see our piece on mortgage rates at 7.4%. For how the Fed fits in, see the September rate hike explainer. Our look at August home sales covers the affordability backdrop.

Common questions

What is the difference between an FHA loan and a conventional loan?

A conventional loan isn't insured or guaranteed by the government. An FHA loan is insured by the Federal Housing Administration, allows down payments as low as 3.5%, and requires mortgage insurance on every loan. CFPB says conventional loans typically cost less but can be harder to qualify for, and that FHA can be the cheapest option for borrowers with lower credit scores or smaller down payments.

What is the conforming loan limit in 2026?

FHFA set the 2026 baseline conforming loan limit for one-unit properties at $832,750, up 3.26% from 2025. In high-cost areas the ceiling is $1,249,125.

When can I get rid of PMI?

On a conventional loan, you can ask in writing to cancel PMI once your balance is scheduled to reach 80% of the home's original value, if you have a good payment history and meet other conditions. It must end automatically when the balance is scheduled to reach 78%, provided you're current. It must also end the month after the loan's amortization midpoint.

What is the difference between interest rate and APR?

The interest rate is the cost of borrowing the principal. The APR is a broader measure that adds points, broker fees, and other loan charges, so it is usually higher.

Is an adjustable-rate mortgage ever a good idea?

It can fit a buyer who expects to move before the fixed period ends, since an ARM could start with a lower monthly payment. CFPB warns that the payment could go up a lot, even double, if you keep the loan longer, and that refinancing is never guaranteed.