What a mortgage actually is, and what happens when you get one

A mortgage is a loan from a bank or lender to buy a house. You promise to pay back the money over time—usually 15 or 30 years—and the house itself serves as collateral, meaning the lender can take it if you stop paying. The lender does not give you the full purchase price upfront. Instead, you provide a down payment (your own money, usually 3 to 20 percent of the price), and the lender covers the rest.

The process from "I want to buy a house" to "I own the house" takes roughly 30 to 45 days and involves multiple people: a loan officer who processes your process, an underwriter who verifies your finances, an appraiser who values the property, a title company that confirms the seller actually owns it, and a closing agent who handles the final paperwork. Each step exists because the lender is taking a large financial risk and needs proof you can repay.

Key Takeaways

  • You will need proof of income (recent pay stubs or tax returns), a down payment saved, and a credit score—most lenders want 620 or higher, though better rates go to scores above 740.
  • The lender will order an appraisal to confirm the house is worth what you are paying; if it is worth less, you may need to pay the difference out of pocket or renegotiate the price.
  • Underwriting is the longest step and involves the lender verifying every number you provided—your income, debts, savings, and employment history.
  • Closing happens at the end and is when you sign the final documents, transfer your down payment and closing costs to the title company, and receive the keys.
  • Your monthly payment includes principal (paying down the loan), interest (the lender's fee), property taxes, homeowners insurance, and possibly mortgage insurance if your down payment was less than 20 percent.

Before you contact a lender: what you need to know about yourself

Lenders will ask for three things when ready: your credit score, your income, and how much money you have saved for a down payment. You can check your credit score free once a year at annualcreditreport.com, which is the only site authorized by the federal government to provide it. Your score comes from your payment history (35 percent), how much debt you carry relative to your limits (30 percent), how long you have had credit accounts (15 percent), and a mix of credit types like cards and loans (10 percent). If your score is below 620, most conventional lenders will decline you; if it is between 620 and 680, you will pay higher interest rates; above 740, you get the best rates available that month.

Income is straightforward: lenders want recent pay stubs (usually the last two months) and your last two years of tax returns. If you are self-employed, you will need profit-and-loss statements and possibly three years of returns. Lenders use a debt-to-income ratio, meaning they divide your total monthly debt payments (car loans, credit cards, student loans, the new mortgage) by your gross monthly income. Most want this ratio below 43 percent, though some go to 50 percent if your credit score is high.

Your down payment is the money you bring to closing. The minimum varies: Federal Housing Administration (FHA) loans allow 3.5 percent down, conventional loans typically require 5 to 20 percent. The larger your down payment, the lower your interest rate and the smaller your monthly payment. If you put down less than 20 percent on a conventional loan, you will pay private mortgage insurance (PMI), an extra monthly fee that protects the lender if you default. PMI typically costs 0.5 to 1 percent of the loan amount per year, divided into your monthly payment.

Getting pre-approved versus getting pre-may have access to

Pre-qualification is informal. You tell a lender your income and debts, they do basic math, and they tell you roughly how much you might borrow. It takes 15 minutes and requires no documents. It is useful for knowing your ballpark, but it is not a promise—the lender has not verified anything you said.

Pre-approval is formal. You provide pay stubs, tax returns, and bank statements; the lender verifies your income and checks your credit; and they issue a letter saying they will lend you up to a specific amount, contingent on the house appraising at that value and nothing changing with your employment or credit. Pre-approval takes 3 to 5 business days and is what real estate agents want to see before you make an offer. It shows the seller you are serious and have already cleared the first financial hurdle.

You do not need to pre-approve with the lender you ultimately use. Many people shop around—getting pre-approvals from two or three lenders to compare interest rates and closing costs. Each pre-approval involves a hard credit inquiry, which temporarily lowers your score by a few points, but multiple inquiries for the same type of loan (mortgage) within 14 to 45 days count as one inquiry, depending on the credit bureau. So shopping around briefly does not significantly harm your score.

The process and underwriting process

Once you find a house and make an offer, you formally explore for the mortgage with your chosen lender. You will fill out a Uniform Residential Loan process (Form 1003), which asks for your personal information, employment history, income, debts, assets, and details about the property. The lender orders a credit report, verifies your employment by contacting your employer, and requests documentation: recent pay stubs, W-2 forms from the last two years, bank statements showing your down payment is real money (not borrowed), and a written explanation of any late payments, collections, or gaps in employment.

The underwriter—a person who works for the lender—reviews all of this. They are looking for inconsistencies, red flags, or missing information. If your income jumped suddenly, they want to know why. If you have a collection account, they want proof you paid it or a letter explaining the circumstances. If you changed jobs, they want confirmation your new job is stable. This step usually takes 5 to 10 business days but can stretch longer if the underwriter has questions.

While underwriting is happening, the lender orders an appraisal. An independent appraiser visits the house, measures it, photographs it, and compares it to similar homes recently sold in the area. The appraisal protects the lender: if the house is worth less than the purchase price, the lender will not lend the full amount. For example, if you are buying a house for $300,000 but it appraises at $280,000, the lender will only lend based on $280,000. You would need to pay the $20,000 difference out of pocket, renegotiate the price with the seller, or walk away. Appraisals typically take 7 to 10 days and cost $400 to $600, which you pay upfront.

Closing costs and what happens at closing

Closing costs are fees charged by the lender, the title company, the appraiser, and other parties involved in the transaction. They typically range from 2 to 5 percent of the loan amount. A $300,000 loan might have $6,000 to $15,000 in closing costs. These include the appraisal fee, loan origination fee (the lender's processing fee), title search and insurance, homeowners insurance (required by the lender), property taxes (prorated for the portion of the year you own it), and recording fees (the cost to file the deed with the county).

The lender must provide you a Loan Estimate within three business days of your process. This document lists all estimated closing costs and your monthly payment. You will receive a second document, the Closing Disclosure, at least three business days before closing. Compare the two: some costs may have changed, and you have the right to ask why.

Closing is the final meeting, usually at the title company's office or a lawyer's office. You sign the promissory note (your promise to repay the loan), the mortgage document (giving the lender a claim on the house), and the closing disclosure. The title company transfers your down payment and closing costs from your bank account, pays off any existing liens on the property, records the new deed with the county, and provides you the keys. The entire closing meeting usually takes 1 to 2 hours. After closing, the lender funds the loan (sends the money to the title company), and the title company pays the seller.

Different types of mortgages and who qualifies for each

Conventional loans are the most common. They are not backed by the government, so lenders set their own rules. They typically require a credit score of 620 or higher, a down payment of at least 5 percent, and proof of stable income. Interest rates are fixed (stay the same for the life of the loan) or adjustable (change after an initial period). Most people choose 30-year fixed-rate mortgages because the payment is predictable.

FHA loans are backed by the Federal Housing Administration, a government agency. They allow down payments as low as 3.5 percent and accept credit scores as low as 580, making them useful for first-time buyers or people with lower credit. The tradeoff is that FHA loans require mortgage insurance for the entire life of the loan, not just until you reach 20 percent equity. This makes the monthly payment higher than a conventional loan at the same interest rate.

VA loans are for military members, veterans, and surviving spouses. They are backed by the Department of Veterans Affairs and often require zero down payment. They do not require mortgage insurance. To use a VA loan, you need a Certificate of may be able to access from the VA, which you can request online at va.gov.

USDA loans are for rural properties and are backed by the U.S. Department of Agriculture. They require zero down payment and are open to people with moderate income in may be able to access areas. You can check if your property qualifies at rd.usda.gov.

What can go wrong, and what to do if it does

The most common problem is the appraisal coming in low. If the house appraises below the purchase price, you have three options: pay the difference yourself, ask the seller to lower the price, or walk away (though you may lose your earnest money deposit depending on your contract). To avoid this, research comparable home sales in the area before making an offer so you know whether the price is realistic.

A second common issue is the underwriter finding a problem during verification. A recent large deposit in your bank account raises questions—the underwriter will ask where it came from to confirm it is not a loan (which would increase your debt-to-income ratio). A job change or gap in employment can delay approval. A collection account or late payment you forgot about can cause denial. The best defense is honesty upfront: tell your lender about any issues before they discover them, and provide documentation explaining the circumstances.

If you are denied, ask the lender why. Federal law requires them to provide a written reason. Common reasons include insufficient income, too much existing debt, or a credit score below their minimum. Some lenders are stricter than others, so if one denies you, another might approve you. You can also ask what you would need to do to reapply—sometimes waiting a few months while you pay down debt or rebuild credit makes a difference.

Frequently Asked Questions

How much house can I afford?

A common rule is that your total monthly debt payments (including the new mortgage) should not exceed 43 percent of your gross monthly income. So if you earn $5,000 per month, your total debt should not exceed $2,150. Subtract what you already owe on cars, credit cards, and student loans, and the remainder is what you can spend on a mortgage. Use this as a starting point, but also consider your actual budget—what you can comfortably afford to pay each month.

Should I get a 15-year or 30-year mortgage?

A 15-year mortgage has a higher monthly payment but you pay far less interest over time. A 30-year mortgage has a lower monthly payment but costs more in total interest. The choice depends on your income and priorities. If you can afford the higher payment and want to own the house faster, choose 15 years. If you want lower monthly payments and more flexibility in your budget, choose 30 years.

What if my credit score is too low?

Most lenders require a minimum of 620, but some go lower. FHA loans accept scores as low as 580. If your score is below 580, you can wait and work on improving it—paying down debt, making all payments on time, and correcting errors on your credit report. You can also look for credit unions or lenders that specialize in lower-credit borrowers, though they typically charge higher interest rates.

Can I get a mortgage if I am self-employed?

Yes, but lenders require more documentation. You will need two to three years of tax returns, profit-and-loss statements, and sometimes bank statements showing consistent income. Some lenders average your income over multiple years, which can work against you if your business is growing. Shop around—some lenders are more experienced with self-employed borrowers than others.

What happens if I miss a mortgage payment?

Missing one payment triggers a late fee and damages your credit score. After 30 days late, the lender reports it to credit bureaus. After 90 days, you are in serious default. After 120 days, the lender can begin foreclosure, a legal process to take back the house. If you are struggling, contact your lender when ready—many offer forbearance (temporarily lowering or pausing payments) or loan modification (changing the terms) to help borrowers stay current.