What a mortgage is and how the money flows

A mortgage is a loan from a bank or lender to buy a house or other real estate. You borrow a large sum of money upfront, and you repay it over time — usually 15 to 30 years — with interest. The property itself serves as collateral, which means if you stop paying, the lender can take the house back through a process called foreclosure.

The money doesn't come from the lender's pocket. Most mortgages are sold to investors or bundled into securities within weeks of closing. Your monthly payment goes to a servicer, a company that collects the money, keeps records, and sends your principal and interest to whoever currently owns the loan. This is why you might receive a notice that your loan has been "sold" — the servicer changed, but your obligation stays the same.

Your monthly payment has four parts, often remembered by the acronym PITI: principal (the amount borrowed), interest (the lender's fee), taxes (property taxes), and insurance (homeowners insurance). Some lenders also collect money for mortgage insurance if your down payment was less than 20 percent. All of these may be bundled into one payment, or you may pay some separately.

Key Takeaways

  • A mortgage is a loan secured by the house itself, meaning the lender can foreclose if you do not pay.
  • Your monthly payment typically includes principal, interest, property taxes, homeowners insurance, and possibly mortgage insurance.
  • The interest rate you receive depends on your credit score, down payment size, loan term, and current market rates.
  • A fixed-rate mortgage keeps the same interest rate for the entire loan term, while an adjustable-rate mortgage changes after an initial period.
  • The lender will order an appraisal to confirm the house is worth at least what you are borrowing, and a title search to verify no one else has a claim on the property.

Interest rates and how they affect your total cost

The interest rate is the percentage of the loan amount you pay annually to borrow the money. On a $300,000 loan at 6 percent over 30 years, you will pay roughly $216,000 in interest alone — nearly as much as the house itself. On the same loan at 5 percent, you pay roughly $186,000 in interest. That one percentage point difference costs you about $30,000 over the life of the loan.

Your rate depends on several factors: your credit score (higher scores get lower rates), the size of your down payment (larger down payments lower risk), the loan term (15-year loans usually have lower rates than 30-year loans), and the current market rate for mortgages. Market rates change daily based on economic conditions and Federal Reserve policy, so the rate available to you today will not be the same next week.

You can lock in a rate when you explore, which freezes that rate for a set number of days — usually 30 to 60 — while your loan is being processed. If rates drop before closing, you may be able to renegotiate, but this varies by lender and loan type. If rates rise, your locked rate protects you.

Fixed-rate versus adjustable-rate mortgages

A fixed-rate mortgage keeps the same interest rate for the entire loan term. Your principal and interest payment never changes. This makes budgeting predictable, and you are protected if rates rise in the future. Most people choose fixed-rate mortgages because the stability is worth the slightly higher starting rate.

An adjustable-rate mortgage (ARM) starts with a lower interest rate for an initial period — often 3, 5, 7, or 10 years — then adjusts periodically based on market conditions. After the fixed period ends, your rate and payment can increase significantly. ARMs are riskier because you cannot predict what you will owe later. They make sense only if you plan to sell or refinance before the rate adjusts, or if you can afford a much higher payment if rates spike.

The initial rate on an ARM is called the teaser rate because it is artificially low to attract borrowers. When the adjustment period begins, the lender adds a margin (their profit) to an index (a market benchmark), and that becomes your new rate. Most ARMs have a cap — a maximum amount the rate can increase per adjustment and over the life of the loan — but even capped increases can double your payment.

Down payment, closing costs, and what you need upfront

Your down payment is the money you contribute toward the purchase price. The lender finances the rest. Down payments typically range from 3 to 20 percent of the purchase price. A larger down payment lowers your loan amount, reduces your monthly payment, and may get you a better interest rate. It also means you avoid paying private mortgage insurance (PMI), which protects the lender if you default and costs 0.5 to 1 percent of the loan amount annually.

Closing costs are fees charged by the lender, title company, appraiser, and other parties involved in the transaction. They typically range from 2 to 5 percent of the loan amount and cover things like the appraisal, title search, underwriting, attorney fees, and recording fees. You will receive a Closing Disclosure — a detailed document listing every cost — at least three business days before closing. Review it carefully against the initial estimate you received.

Some lenders offer to roll closing costs into the loan, so you do not pay them upfront. This increases your loan amount and the total interest you pay, but it reduces the cash you need on closing day. Others offer a credit toward closing costs in exchange for accepting a slightly higher interest rate.

The appraisal, title search, and underwriting process

Before the lender commits to the loan, three things must happen. First, a licensed appraiser inspects the house and compares it to similar homes that recently sold in the area. The appraisal confirms the house is worth at least what you are borrowing. If the appraisal comes in low, you have a few options: renegotiate the price with the seller, increase your down payment to cover the gap, or walk away (if your contract allows it).

Second, a title search confirms that the seller actually owns the property and that no one else has a legal claim on it — such as a lien from unpaid taxes or a contractor. The title company issues a title insurance policy that protects you and the lender if a claim surfaces later. This is a one-time fee, usually a few hundred dollars.

Third, underwriting is the lender's review of your finances, credit, employment, and the property itself. The underwriter verifies your income (usually by requesting recent tax returns and pay stubs), checks your credit report, and confirms you have not taken on new debt since you applied. They may ask for explanations of late payments, large deposits, or gaps in employment. This process typically takes one to two weeks.

Refinancing: when and why homeowners replace their mortgage

Refinancing means taking out a new mortgage to pay off the old one. Homeowners refinance to lower their interest rate, shorten the loan term, switch from an ARM to a fixed rate, or pull out equity to pay for other expenses. You pay closing costs again, so refinancing only makes financial sense if the savings outweigh those costs.

A rate-and-term refinance replaces your current loan with a new one at a better rate or shorter term. If you refinance a $300,000 loan at 6 percent down to 5 percent, your monthly payment drops by roughly $150. If closing costs are $6,000, you break even in about 40 months. If you plan to stay in the house longer than that, the refinance pays for itself.

A cash-out refinance lets you borrow more than you owe and receive the difference as cash. If your house is worth $400,000 and you owe $250,000, you might refinance for $300,000 and receive $50,000 in cash. This is a way to access your home equity, but it increases your loan amount and monthly payment. The interest on the borrowed cash is tax-deductible only if you use it to improve the home.

Property taxes, insurance, and escrow accounts

Property taxes are annual taxes paid to your local government based on the assessed value of your home. They vary widely by location — from less than 1 percent of home value in some states to over 2 percent in others. Your lender requires you to pay property taxes because unpaid taxes give the government the right to foreclose and take the house.

Homeowners insurance covers damage to the structure and your belongings from fire, theft, weather, and other perils. It does not cover floods or earthquakes — those require separate policies. Your lender requires insurance because they have a financial interest in the property. The cost depends on the home's age, location, construction type, and your coverage limits.

Most lenders set up an escrow account (also called an impound account) where you deposit money each month for taxes and insurance. The lender pays these bills on your behalf when they are due. This protects the lender but also protects you — you cannot skip these payments. Some lenders allow you to pay taxes and insurance directly if you have a strong credit history and a large down payment, but most require escrow.

Frequently Asked Questions

What credit score do I need to get a mortgage?

Most lenders require a credit score of at least 620, but scores of 740 or higher typically get the best rates. Your score is one factor among many — lenders also look at your debt-to-income ratio, employment history, and down payment size. If your score is below 620, some lenders specialize in lower-score borrowers, but you will pay a higher rate.

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

Yes, but the process is more involved. Lenders typically require two years of tax returns to verify your income, and they average your income over that period. If your business is new or your income fluctuates significantly, some lenders will decline you. Others specialize in self-employed borrowers and may accept bank statements or profit-and-loss statements instead.

What happens if I miss a mortgage payment?

Missing one payment triggers a late fee and a note on your credit report. After 30 days, the lender reports it to credit bureaus. After 90 days, you are in serious default. After 120 days, the lender typically begins foreclosure proceedings. Contact your lender when ready if you cannot pay — many offer forbearance (temporarily pausing payments) or loan modification (changing the terms) to help you avoid foreclosure.

How much house can I afford?

A common rule is that your total monthly housing costs (principal, interest, taxes, insurance, and PMI) should not exceed 28 percent of your gross monthly income. Your total debt payments, including the mortgage, should not exceed 36 percent. If you earn $5,000 per month, your housing payment should stay under $1,400. Use these as guidelines, but also consider your emergency savings, other debts, and comfort level with risk.

What is the difference between a mortgage broker and a mortgage lender?

A mortgage lender is a bank or company that provides the actual money. A mortgage broker is an intermediary who shops your process to multiple lenders and earns a commission. Brokers can save you time by comparing options, but they do not always find the best deal — some lenders do not work with brokers. You can work with both a lender and a broker, or go directly to a lender yourself.