Mortgage: What It Is, How It Works & How to Get One (2026 Guide)

A mortgage is a secured loan you use to purchase real estate. The home itself acts as collateral, meaning the lender can foreclose if you stop making payments.

You borrow a lump sum (the principal) and repay it over a fixed term—typically 15 or 30 years—plus interest. Each monthly payment covers principal, interest, property taxes and homeowners insurance (often abbreviated PITI).

When you apply for a mortgage, the lender evaluates your credit score, debt-to-income ratio (DTI), employment history and down payment. A higher credit score and lower DTI usually unlock better interest rates.

Once approved, you'll receive a Loan Estimate showing the APR, closing costs and monthly payment breakdown. The annual percentage rate (APR) includes the interest rate plus fees, giving you the true cost of borrowing.

Most lenders require an escrow account to hold funds for property taxes and insurance. Each month, you pay 1/12 of the annual tax and insurance bill into escrow; the lender pays those bills on your behalf.

Fixed-rate mortgages lock in one interest rate for the life of the loan. A 30-year fixed-rate mortgage offers predictable payments but higher total interest than a 15-year term.

FHA loans are government-backed mortgages that accept down payments as low as 3.5 % and credit scores around 580. You'll pay mortgage insurance premiums (MIP) for the loan's life if you put down less than 10 %.

VA loans are available to eligible veterans and active-duty service members with zero down payment and no private mortgage insurance. USDA loans serve rural buyers with low-to-moderate income, also offering 0 % down.

Below is a sample monthly payment on a $300,000 mortgage at 6.5 % APR over 30 years, with property taxes of $3,600/year and homeowners insurance of $1,200/year.

In month one, roughly $1,271 of your $1,896 principal-and-interest payment goes to interest; only $625 reduces the principal. By year 15, those proportions flip.

1. 1Check your credit report and score. Aim for 620+ for conventional loans, 740+ for the best rates. Dispute errors and pay down high-balance credit cards to lower your credit utilisation ratio.
2. 2Calculate how much you can afford. Lenders prefer a DTI below 43 % (all monthly debts ÷ gross monthly income). Include the future mortgage payment in that calculation.
3. 3Save for a down payment and closing costs. Conventional loans often require 5–20 % down; putting down 20 % avoids private mortgage insurance (PMI). Budget 2–5 % of the purchase price for closing costs.
4. 4Get pre-approved. Submit pay stubs, tax returns, bank statements and authorization for a credit pull. Pre-approval shows sellers you're a serious buyer and locks an interest-rate estimate for 60–90 days.
5. 5Shop lenders and compare Loan Estimates. Request quotes from at least three lenders within a 14-day window (multiple mortgage inquiries in that span count as one hard pull). Compare APR, points, origination fees and lender credits.
6. 6Make an offer and open escrow. Once the seller accepts, the lender orders an appraisal to confirm the home's value. If it appraises low, you may need to renegotiate or bring extra cash.
7. 7Lock your rate and finalize underwriting. Rate locks typically last 30–60 days. The underwriter verifies income, assets and title; you'll provide updated bank statements and explain any large deposits.
8. 8Attend closing and sign documents. Bring a cashier's check or arrange a wire for your down payment and closing costs. You'll sign the promissory note, mortgage deed and dozens of disclosure forms. The lender funds the loan, and you receive the keys.

Skipping pre-approval. House-hunting without pre-approval wastes time on homes you can't afford and weakens your negotiating position.

Ignoring the total cost of homeownership. Your mortgage payment is only part of the equation. Maintenance, utilities, HOA fees and repairs can add 1–2 % of the home's value each year.

Raiding retirement accounts for a down payment. A 401(k) loan or early IRA withdrawal triggers taxes, penalties and lost compounding. Explore down-payment assistance programs or save longer instead.

Choosing an ARM without a plan. Adjustable-rate mortgages make sense if you'll sell or refinance before the rate adjusts, but betting on future refinancing is risky. If rates spike or your home value drops, you could be stuck with an unaffordable payment.

A mortgage forces you to build equity—the portion of the home you own outright—with every principal payment. Over 30 years, even at 6.5 % interest, you transform $300,000 of borrowed money into an asset worth (historically) much more, thanks to property appreciation.

Renting offers flexibility and no maintenance costs, but your monthly payment builds your landlord's equity, not yours. If you plan to stay in one area for at least five years, the transaction costs of buying (closing costs, agent commissions on resale) are usually offset by appreciation and principal paydown.

You can deduct mortgage interest on loans up to $750,000 ($375,000 if married filing separately) if you itemize deductions on Schedule A. You'll also deduct property taxes up to a $10,000 cap (combined state, local and property tax, known as the SALT cap).

For many households, the standard deduction ($30,000 for married couples in 2026) exceeds itemized deductions in the early years, so the mortgage-interest deduction adds zero tax savings. As your balance falls and interest shrinks, you'll almost certainly take the standard deduction.

Refinancing replaces your existing mortgage with a new loan, ideally at a lower rate or shorter term. A rate-and-term refinance changes the interest rate or loan length without pulling cash out; a cash-out refinance increases the loan balance and gives you the difference in cash.

Refinancing makes sense when rates drop at least 0.75–1.0 percentage points below your current rate, or when your credit score improves enough to qualify for better terms. Closing costs run 2–5 % of the loan amount, so calculate your break-even point: months to recoup closing costs ÷ monthly savings.

Extra principal payments shorten your loan term and save thousands in interest. Even an additional $100 per month on a $300,000, 30-year loan at 6.5 % cuts roughly four years and $50,000 in interest.

Before prepaying, confirm your lender applies extra funds to principal (most do) and charges no prepayment penalty. Then compare the guaranteed 6.5 % "return" of avoided interest against investing that $100 in a diversified portfolio, which historically returns 8–10 % annually.

Many people split the difference: make extra mortgage payments and invest, prioritizing peace of mind and a debt-free retirement. There's no single right answer; it depends on your risk tolerance and financial goals.

What credit score do you need for a mortgage?

You can qualify for an FHA mortgage with a score as low as 580 (500 with 10 % down). Conventional loans typically require 620+, and the best interest rates go to borrowers with 740 or higher.

How much down payment do I need?

Conventional loans accept as little as 3–5 % down, but you'll pay PMI until you reach 20 % equity. FHA loans require 3.5 % down with a 580+ score.

VA and USDA loans offer 0 % down for eligible buyers. A larger down payment lowers your monthly cost, reduces total interest and can unlock better rates.

What is PMI and how do I avoid it?

You can request PMI cancellation once your balance drops to 78 % of the original home value, or refinance into a no-PMI loan if your home appreciates enough to give you 20 % equity.

Can I get a mortgage if I'm self-employed?

Yes, but you'll need two years of tax returns, profit-and-loss statements and often a CPA letter verifying income. Lenders average your net income (after business deductions) across 24 months, which can be lower than W-2 earnings.

What happens if I miss a mortgage payment?

One late payment (30+ days overdue) appears on your credit report and can drop your score 60–100 points. After 90 days, the lender may send a formal notice; after 120 days, foreclosure proceedings can begin.

If you're facing hardship, contact your servicer immediately to explore forbearance (temporary pause), loan modification (permanent term change) or a repayment plan. Federal and state programs exist to help—ignoring the problem guarantees foreclosure.

Bottom line: A mortgage is the most common path to homeownership in the US, blending forced savings (equity buildup) with leverage (using borrowed money to control an appreciating asset). Compare loan types, lock the lowest rate you qualify for, and never borrow more than you can comfortably afford—even if the bank says yes.