# What is a Mortgage and How Does It Work? By Opendoor Editorial Team | 2025-12-01 A mortgage is a loan used to buy or refinance a home, where the property itself serves as collateral for the lender. Also known as a home mortgage or mortgage loan, it allows you to spread the cost of a home over a set repayment period — typically 15 or 30 years — rather than paying the full purchase price upfront. You make monthly payments that include principal (the amount you borrowed) and interest (the cost of borrowing), and once the loan is fully repaid, you own the home outright. For most people, a mortgage is the largest financial commitment they'll ever make. Understanding how mortgages work, the types available, and the steps to qualify can save you tens of thousands of dollars over the life of your loan. This guide breaks down everything you need to know — whether you're a first-time buyer or looking to refinance. [Get your offer](#) ## What Is a Mortgage? ### Mortgage Definition A mortgage is a type of secured loan specifically designed to finance the purchase or refinancing of real estate. The borrower agrees to repay the lender over a fixed period with interest, and the property acts as collateral. If the borrower stops making payments, the lender has the legal right to take possession of the home through a process called foreclosure. The mortgage meaning can be traced to Old French, where it literally translates to "death pledge" — not because of any morbid implication, but because the agreement "dies" once the debt is fully paid or the property is seized. ### How a Mortgage Differs from Other Loans Unlike a personal loan or auto loan, a mortgage is a **secured loan**, meaning the property you're purchasing backs the debt. This distinction matters for several reasons: - **Lower interest rates**: Because the lender has collateral (your home), mortgages typically carry lower interest rates than unsecured debt like credit cards or personal loans. - **Longer repayment terms**: Mortgages are repaid over 15 to 30 years, whereas most other consumer loans have terms of two to seven years. - **Larger loan amounts**: Mortgage loans routinely reach into the hundreds of thousands — or even millions — of dollars, far exceeding what most unsecured lenders would approve. - **Tax benefits**: Mortgage interest may be tax-deductible, which is generally not the case with other consumer loans. Consult a tax professional for guidance on your specific situation. If you're new to real estate terminology, our [real estate terms glossary](https://www.opendoor.com/articles/real-estate-terms-you-should-know) covers many of the terms you'll encounter throughout the home buying process. ## How Does a Mortgage Work? So how does a mortgage work in practice? Once a lender approves your loan and you close on the home, you begin making regular monthly payments for the duration of your loan term. But there's more happening behind the scenes than a simple monthly bill. ### The Mortgage Process: From Application to Closing Here's how the mortgage process unfolds, step by step: 1. **Preapproval**: You submit financial documents — pay stubs, tax returns, bank statements — to a lender, who evaluates your creditworthiness and tells you how much you can borrow. 2. **Home search and offer**: With preapproval in hand, you search for a home within your budget and make an offer. You'll typically submit [earnest money](https://www.opendoor.com/articles/earnest-money) to show you're serious. 3. **Loan application**: Once your offer is accepted and the home goes [under contract](https://www.opendoor.com/articles/under-contract-meaning), you complete a formal mortgage application with your chosen lender. 4. **Home appraisal**: The lender orders an appraisal to confirm the home's value supports the loan amount. Learn more about [how long an appraisal takes](https://www.opendoor.com/articles/how-long-does-an-appraisal-take) and what to expect. 5. **Underwriting**: The lender's underwriting team verifies your financial information, reviews the appraisal, and assesses overall risk before issuing a final approval. 6. **Closing**: You sign the final paperwork, pay closing costs and your down payment, and the lender funds the loan. The process of [how long closing takes](https://www.opendoor.com/articles/how-long-does-closing-take) varies but typically runs 30 to 45 days from application. 7. **Monthly payments begin**: Usually within 30 to 60 days of closing, you start making monthly mortgage payments to your loan servicer. ### How Monthly Mortgage Payments Work Your monthly mortgage payment is more than just principal and interest. Most borrowers pay what's known as **PITI**: - **Principal**: The portion that reduces your outstanding loan balance. - **Interest**: The cost charged by the lender for borrowing the money. - **Taxes**: Property taxes, often collected monthly and held in escrow. - **Insurance**: Homeowners insurance (and mortgage insurance, if applicable), also typically escrowed. **Example**: Say you take out a $300,000 fixed-rate mortgage at 6.5% interest for 30 years. Your monthly principal and interest payment would be approximately **$1,896**. Add property taxes of $250/month, homeowners insurance of $125/month, and potentially PMI of $150/month, and your total payment comes to roughly **$2,421/month**. Understanding the [total cost of buying a house](https://www.opendoor.com/articles/how-much-does-it-cost-to-buy-a-house) — beyond just the mortgage payment — helps you budget accurately. ### Understanding Mortgage Amortization Mortgage amortization is the process by which your loan balance decreases over time through scheduled payments. What surprises many borrowers is how the split between principal and interest changes dramatically over the life of the loan. In the early years, the **majority of each payment goes toward interest**. Over time, that ratio flips, and more of each payment chips away at the principal balance. **Simplified amortization example** (based on a $300,000 loan at 6.5%, 30-year term): | **Payment Year** | **Monthly Payment** | **Interest Portion** | **Principal Portion** | **Remaining Balance** | | Year 1 | $1,896 | $1,621 | $275 | $296,605 | | Year 10 | $1,896 | $1,384 | $512 | $259,300 | | Year 20 | $1,896 | $954 | $942 | $189,465 | | Year 30 | $1,896 | $20 | $1,876 | $0 | This is why making extra payments early in your mortgage term has an outsized impact — every additional dollar goes directly toward principal, reducing the total interest you'll pay. ## Types of Mortgages Choosing the right type of mortgage can significantly affect your monthly payment, total interest costs, and qualification requirements. Below is a breakdown of the most common types of mortgages available to homebuyers in 2026. ### Fixed-Rate Mortgage A **fixed-rate mortgage** locks in your interest rate for the entire loan term. Your principal and interest payment stays the same from month one through your final payment, regardless of how market rates change. - **Common terms**: 30-year and 15-year (20-year and 10-year also available) - **30-year vs. 15-year**: A 30-year term gives you lower monthly payments but higher total interest. A 15-year term means higher monthly payments but substantial interest savings — often hundreds of thousands of dollars over the life of the loan. - **Best for**: Buyers who want predictable payments, plan to stay in the home long-term, or prefer budgeting stability. Fixed-rate mortgages are the most popular loan type in the U.S. According to [Freddie Mac](http://www.freddiemac.com/research/insight/20230101-housing-market.page), the 30-year fixed-rate mortgage has been the dominant choice for American homebuyers for decades. ### Adjustable-Rate Mortgage (ARM) An **adjustable-rate mortgage** starts with a fixed interest rate for an introductory period, then adjusts periodically based on a benchmark index plus a margin. - **Common structures**: 5/1 ARM (fixed for 5 years, adjusts annually), 7/1 ARM, 10/1 ARM - **Rate caps**: Most ARMs include caps that limit how much the rate can increase per adjustment period and over the life of the loan. - **Best for**: Buyers who plan to sell or refinance before the introductory period ends, or those who expect rates to drop. **Risk to consider**: If rates rise significantly after the fixed period, your monthly payment could increase substantially. ### Conventional Loan A **conventional mortgage** is any loan that isn't backed by a government agency. Most conventional loans conform to guidelines set by Fannie Mae and Freddie Mac. - **Down payment**: As low as 3% for qualifying borrowers. Learn more about whether [5% is enough for a down payment](https://www.opendoor.com/articles/briefs/is-5-percent-enough-down-payment). - **PMI**: Required if your down payment is less than 20%; can be removed once you reach 20% equity. - **Conforming loan limits**: For 2025, the [Federal Housing Finance Agency (FHFA)](https://www.fhfa.gov/data/conforming-loan-limit) set the baseline conforming loan limit at $806,500 for most U.S. counties, with higher limits in high-cost areas. - **Best for**: Borrowers with good credit (typically 620+) and stable income. ### FHA Loan **FHA loans** are insured by the Federal Housing Administration and designed to help borrowers who may not qualify for conventional financing. - **Down payment**: As low as [3.5% with a credit score of 580+](https://www.hud.gov/buying/loans) - **Credit requirements**: Borrowers with scores as low as 500 may qualify with a 10% down payment. - **Mortgage insurance**: FHA loans require both an upfront mortgage insurance premium (MIP) of 1.75% and annual MIP for the life of the loan (in most cases). - **Best for**: First-time buyers, those with lower credit scores, or buyers with limited savings for a down payment. ### VA Loan **VA loans** are guaranteed by the U.S. Department of Veterans Affairs and available to eligible service members, veterans, and surviving spouses. - **Down payment**: None required. - **PMI**: Not required — a major cost advantage. - **Funding fee**: A one-time fee (typically 1.25%–3.3%) that can be rolled into the loan. - **Best for**: Eligible military-connected borrowers looking for favorable terms. According to the [VA](https://www.va.gov/housing-assistance/home-loans/), VA loans consistently offer some of the lowest average interest rates available. ### USDA Loan **USDA loans** are backed by the U.S. Department of Agriculture and designed to promote homeownership in eligible rural and suburban areas. - **Down payment**: None required. - **Income limits**: Household income generally cannot exceed 115% of the area median income. - **Guarantee fee**: Requires an upfront and annual guarantee fee (similar to FHA's MIP, but typically lower). - **Best for**: Low- to moderate-income buyers purchasing in [USDA-eligible areas](https://www.rd.usda.gov/programs-services/single-family-housing-programs). ### Jumbo Loan A **jumbo loan** exceeds the conforming loan limits set by the FHFA. Because these loans can't be purchased by Fannie Mae or Freddie Mac, they carry higher risk for lenders. - **Down payment**: Typically 10%–20% or more. - **Credit score**: Usually 700+ required. - **Interest rates**: May be slightly higher than conforming loans, though the gap has narrowed in recent years. - **Best for**: Buyers purchasing high-value properties in expensive markets. ### Mortgage Types Comparison Table | **Mortgage Type** | **Min. Down Payment** | **Min. Credit Score** | **PMI / MI Required?** | **Best For** | | **Fixed-Rate** | 3%–5% (conventional) | 620+ | If < 20% down | Long-term stability | | **ARM** | 3%–5% (conventional) | 620+ | If < 20% down | Short-term ownership | | **Conventional** | 3% | 620+ | If < 20% down (removable) | Good credit borrowers | | **FHA** | 3.5% | 580+ (3.5% down) | Yes (life of loan, most cases) | Lower credit / first-time buyers | | **VA** | 0% | No official minimum\* | No | Military-connected buyers | | **USDA** | 0% | 640+ (typical) | Guarantee fee required | Rural / suburban buyers | | **Jumbo** | 10%–20% | 700+ | Varies by lender | High-value properties | \*VA lenders typically require a minimum score of 620, though the VA itself sets no minimum. ## Key Mortgage Terms You Should Know Navigating the mortgage process is easier when you understand the terminology. Here are the essential mortgage terms every borrower should know. ### Principal and Interest **Principal** is the original amount you borrowed. **Interest** is what the lender charges you for the privilege of borrowing that money. Together, they make up the core of your monthly mortgage payment. As explained in the amortization section above, the ratio between the two shifts over time — early payments are interest-heavy, while later payments are principal-heavy. ### Escrow An **escrow account** is a holding account managed by your mortgage servicer. Each month, a portion of your payment is deposited into escrow to cover property taxes and homeowners insurance. When those bills come due, your servicer pays them on your behalf. Escrow protects the lender by ensuring taxes and insurance stay current on the property securing their loan. ### Private Mortgage Insurance (PMI) **PMI** is a monthly charge added to your payment when your down payment is less than 20% on a conventional loan. It protects the lender — not you — in case of default. The cost typically ranges from 0.5% to 1.5% of the original loan amount per year. Once you build 20% equity, you can request PMI removal. ### Debt-to-Income Ratio (DTI) Your **DTI ratio** measures how much of your gross monthly income goes toward debt payments. Lenders use two DTI calculations: - **Front-end DTI**: Housing costs (mortgage, taxes, insurance) ÷ gross monthly income - **Back-end DTI**: All monthly debt payments (housing + car loans + student loans + credit cards, etc.) ÷ gross monthly income Most lenders prefer a back-end DTI of **43% or lower**, though some loan programs allow higher ratios with compensating factors. ### Loan-to-Value Ratio (LTV) **LTV** compares your loan amount to the home's appraised value. For example, if you buy a $400,000 home with a $60,000 down payment, your loan is $340,000 and your LTV is 85%. A lower LTV signals less risk to the lender and can help you secure better rates and avoid PMI. ### APR vs. Interest Rate Your **interest rate** is the base cost of borrowing, expressed as a percentage. Your **APR (Annual Percentage Rate)** includes the interest rate *plus* other loan costs — such as origination fees, discount points, and certain closing costs — rolled into a single figure. The APR gives you a more complete picture of the total cost of the loan and is the better number to use when comparing offers from different lenders. For a broader overview of homebuying vocabulary, visit our [real estate terms glossary](https://www.opendoor.com/articles/real-estate-terms-you-should-know). ## How to Get a Mortgage Knowing how to get a mortgage — and preparing in advance — can make the difference between a smooth approval and a stressful process. Here's how to approach it step by step. ### Step 1 — Check Your Credit and Finances Before you apply, review your credit reports from all three bureaus (Equifax, Experian, TransUnion) at [AnnualCreditReport.com](https://www.annualcreditreport.com). Dispute any errors, pay down high-balance credit cards, and avoid opening new credit accounts. A higher credit score qualifies you for better rates, which can save tens of thousands of dollars over the life of your loan. ### Step 2 — Determine How Much You Can Afford Calculate what you can comfortably spend on housing each month, factoring in not just the mortgage payment but also property taxes, insurance, maintenance, and utilities. Our guide on [how much to save for a house](https://www.opendoor.com/articles/how-much-to-save-for-house) helps you think through the full financial picture, including your down payment and closing costs. ### Step 3 — Get Preapproved Mortgage preapproval involves a lender reviewing your financial documentation and issuing a letter stating how much they're willing to lend you. Preapproval is more thorough than prequalification (which is often based on self-reported information) and carries more weight with sellers. A preapproval letter is practically essential in competitive markets — sellers are far more likely to accept an offer from a preapproved buyer. ### Step 4 — Compare Lenders and Rates Don't accept the first rate you're quoted. Get loan estimates from at least three lenders — including banks, credit unions, and online lenders. Compare: - Interest rate and APR - Closing costs and lender fees - Loan terms available - Rate lock policies - Customer service and responsiveness Even a 0.25% difference in rate on a $350,000 mortgage can amount to more than **$18,000** in additional interest over 30 years. ### Step 5 — Submit Your Application Once you choose a lender and loan type, you'll submit a full application along with supporting documentation. Be prepared to provide: - W-2s and tax returns (typically two years) - Recent pay stubs - Bank and investment account statements - Government-issued ID - Information on existing debts ### Step 6 — Underwriting and Closing During underwriting, the lender verifies everything — your income, assets, employment, credit, and the property's value (via the appraisal). They may request additional documentation. Once underwriting issues a "clear to close," you'll schedule your closing date. At closing, you'll sign the final loan documents, pay your down payment and closing costs, and receive the keys. The entire process from application to closing typically takes [30 to 60 days](https://www.opendoor.com/articles/briefs/how-long-does-it-take-to-buy-a-house), though timelines vary. ## How Much Mortgage Can You Afford? One of the most important questions buyers ask is: *how much mortgage can I afford?* The answer depends on your income, existing debt, down payment, and local housing costs. ### The 28/36 Rule A widely used guideline in mortgage lending is the **28/36 rule**: - Spend no more than **28%** of your gross monthly income on housing costs (mortgage, taxes, insurance). - Keep total debt payments below **36%** of your gross monthly income. **Example**: If your household earns $8,000/month before taxes, the 28/36 rule suggests your housing costs should stay below $2,240/month and your total debt payments below $2,880/month. This is a guideline, not a hard rule — some borrowers comfortably exceed it, while others prefer to stay well below it for financial flexibility. ### How Your Down Payment Affects Your Mortgage Your down payment directly influences several aspects of your mortgage: - **Loan amount**: A larger down payment means borrowing less, which lowers your monthly payment. - **PMI**: Putting down 20% or more on a conventional loan eliminates the need for private mortgage insurance. - **Interest rate**: Borrowers with larger down payments often qualify for slightly lower rates because they represent less risk. - **Equity**: A bigger down payment gives you more home equity from day one, which provides a financial cushion if home values dip. If you're weighing how much to put down, our guide on [whether 5% is enough for a down payment](https://www.opendoor.com/articles/briefs/is-5-percent-enough-down-payment) covers the trade-offs. ### Using a Mortgage Calculator Online mortgage calculators let you estimate monthly payments by entering the home price, down payment, interest rate, loan term, and estimated taxes and insurance. While no calculator can replace a lender's official estimate, it's a valuable tool for understanding how different variables affect your budget. Try adjusting the loan term from 30 years to 15 years, or increasing your down payment by $10,000, to see how the numbers shift. ## What Affects Your Mortgage Rate? Your mortgage rate determines how much you'll pay in interest over the life of your loan. Even small rate differences have a huge cumulative impact, so understanding what drives your rate is critical. ### Credit Score Your credit score is one of the most influential factors. According to [FICO](https://www.myfico.com/credit-education/calculators/loan-savings-calculator/), borrowers with scores above 760 consistently receive the most favorable rates. A score in the 620–660 range might still qualify you for a mortgage, but at a noticeably higher rate — potentially adding hundreds of dollars per month. ### Down Payment and Loan-to-Value A higher down payment reduces your LTV, which lowers the lender's risk. Many lenders offer better rates when LTV is at or below 80% (i.e., you put 20% or more down). ### Loan Type and Term - **Shorter terms** (15-year) typically carry lower interest rates than longer terms (30-year). - **Fixed-rate** loans generally start with slightly higher rates than the introductory rates on ARMs. - **Government-backed loans** (FHA, VA) may offer competitive rates, but associated fees (MIP, funding fees) affect the total cost. ### Market Conditions Mortgage rates are influenced by broader economic forces, including: - **Federal Reserve monetary policy**: While the Fed doesn't set mortgage rates directly, its actions on the federal funds rate influence overall borrowing costs. - **Bond market**: Mortgage rates tend to track the yield on the 10-year U.S. Treasury note. - **Inflation**: Higher inflation typically pushes rates up. - **Housing market conditions**: Supply, demand, and investor appetite for mortgage-backed securities all play a role. **Rate tip**: Discount points allow you to "buy down" your rate by paying an upfront fee at closing — typically 1% of the loan amount per point. This can make sense if you plan to stay in the home long enough to recoup the upfront cost through lower monthly payments. [Get your offer](#) ## Frequently Asked Questions About Mortgages ### What is the difference between a mortgage and a loan? A mortgage is a specific type of loan used to purchase or refinance real estate. The key difference is that a mortgage is **secured by the property itself**. If you default, the lender can foreclose on the home. Other loans — such as personal loans — are typically unsecured and don't involve collateral. ### How long does it take to get a mortgage? From application to closing, the mortgage process typically takes **30 to 45 days**, though it can be shorter or longer depending on lender efficiency, your documentation readiness, and the complexity of the transaction. Getting preapproved in advance can speed up the timeline. ### What credit score do you need for a mortgage? Minimum credit score requirements vary by loan type: - **Conventional**: 620+ - **FHA**: 580+ (for 3.5% down), 500+ (for 10% down) - **VA**: No official minimum, but most lenders require 620+ - **USDA**: Typically 640+ Higher scores unlock better interest rates and more favorable terms. ### Can you pay off a mortgage early? Yes. Most mortgages allow early payoff without penalty, though some loans include a **prepayment penalty** during the first few years. Check your loan agreement. Paying extra toward principal — whether through lump sums or additional monthly payments — reduces total interest and shortens your loan term. ### What happens if you miss a mortgage payment? Missing one payment typically triggers a late fee (often 3%–6% of the payment) after a grace period of around 15 days. If you fall 30+ days behind, the lender reports the delinquency to credit bureaus, damaging your credit score. After 90 to 120 days of missed payments, the lender may begin foreclosure proceedings. If you're struggling, contact your servicer immediately — most offer hardship options such as forbearance or loan modification. ### What is mortgage preapproval vs. prequalification? **Prequalification** is an informal estimate of how much you might borrow, often based on self-reported financial information. **Preapproval** is a more rigorous process where the lender verifies your income, assets, credit, and employment, then issues a conditional commitment for a specific loan amount. Preapproval carries far more weight with sellers and gives you a more accurate budget. ### How is mortgage interest calculated? Mortgage interest is typically calculated on the **outstanding principal balance** and charged monthly. For a fixed-rate mortgage, the lender divides your annual rate by 12 to determine the monthly interest charge. Early in the loan, when your balance is highest, the interest portion of your payment is largest. As you pay down principal, the interest charge decreases — this is the amortization process in action. ### What is escrow on a mortgage? Escrow on a mortgage refers to an account your servicer manages on your behalf. A portion of each monthly payment is deposited into this account and used to pay property taxes and homeowners insurance when they come due. Escrow ensures these critical expenses are paid on time, protecting both you and the lender. Most lenders require escrow accounts for borrowers with less than 20% equity. ### What is the difference between a fixed-rate and adjustable-rate mortgage? A **fixed-rate mortgage** maintains the same interest rate and monthly principal-and-interest payment for the entire loan term. An **adjustable-rate mortgage (ARM)** offers a lower fixed rate for an introductory period (often 5, 7, or 10 years), after which the rate adjusts periodically based on market conditions. Fixed-rate loans offer stability, while ARMs may save money in the short term but carry the risk of rising payments. ### How much down payment do I need for a mortgage? Down payment requirements vary by loan type. Conventional loans may require as little as **3%**, FHA loans start at **3.5%**, and VA and USDA loans offer **0% down** options for eligible borrowers. However, a larger down payment reduces your monthly costs, helps you avoid mortgage insurance, and may secure a better rate. Review our guide on [how much to save for a house](https://www.opendoor.com/articles/how-much-to-save-for-house) for a detailed breakdown. *Buying a home is one of the biggest financial decisions you'll make. If you're ready to explore your options — or considering selling your current home first — \[see how Opendoor compares to a traditional sale\](https://www.opendoor.com/articles/how-selling-to-opendoor-compares-to-a-traditional-home-sale) and discover a simpler way to move.* --- *Originally published at [https://www.opendoor.com/articles/what-is-a-mortgage-and-how-does-it-work](https://www.opendoor.com/articles/what-is-a-mortgage-and-how-does-it-work)*