A mortgage is a loan used to purchase real estate, where the property itself serves as collateral. If you stop making payments, the lender has the right to foreclose on the property to recover their money. For most buyers, a mortgage is the only realistic path to homeownership, since few people can pay hundreds of thousands of dollars in cash. For a clear, plain-language overview of how mortgages work, the CFPB mortgage explainer is a helpful starting point.
Understanding how mortgages work, what types are available, and how to secure the best terms can save you tens of thousands of dollars over the life of your loan. This guide covers the essentials. If you are ready to start the home buying process, our complete guide to buying a home walks through every step from pre-approval to closing.
How Mortgages Work
When you take out a mortgage, you agree to repay the borrowed amount (principal) plus interest over a set period (the loan term). Each monthly payment includes a portion that goes toward principal and a portion that covers interest. In the early years, most of your payment goes toward interest. As the loan matures, a larger share goes toward principal.
Your monthly payment also typically includes escrow contributions for property taxes and homeowner's insurance. The lender collects these amounts monthly and pays them on your behalf when they come due.
The total cost of your mortgage depends on three primary factors: the loan amount, the interest rate, and the loan term. According to the Freddie Mac Primary Mortgage Market Survey, the current 30-year fixed rate is approximately 6.22%. A $300,000 loan at 6.5% over 30 years costs roughly $383,000 in interest alone, bringing the total repayment to $683,000. The same loan at 5.5% costs about $313,000 in interest, a savings of $70,000. You can view historical mortgage rate data from FRED to see how today's rates compare to long-term averages.
A $300,000 loan at 6.5% over 30 years costs roughly $383,000 in interest alone. At 5.5%, it costs $313,000 - a savings of $70,000 from a single percentage point.
Even a Small Rate Difference Adds Up
On a $300,000 loan, the difference between 6.5% and 5.5% is roughly $70,000 in total interest over 30 years. Shopping around with multiple lenders and improving your credit score before applying can save you tens of thousands of dollars.
Types of Mortgages
Fixed-Rate Mortgage
The interest rate stays the same for the entire loan term. This is the most popular option because it provides predictable monthly payments. Available in 15-year and 30-year terms (and occasionally 10 or 20 years), fixed-rate mortgages are ideal for buyers who plan to stay in the home long-term and want payment stability.
A 15-year fixed-rate mortgage has higher monthly payments but saves significantly on total interest compared to a 30-year term. Many buyers choose the 30-year for the lower required payment but make extra payments when possible to pay down the loan faster.
Adjustable-Rate Mortgage (ARM)
An ARM starts with a lower interest rate for an initial period (typically 5, 7, or 10 years), then adjusts periodically based on a market index. A 5/1 ARM, for example, has a fixed rate for five years, then adjusts annually.
ARMs can be attractive if you plan to sell or refinance before the adjustment period begins. The initial rate is typically 0.5-1% lower than a comparable fixed-rate mortgage. However, if rates rise and you are still in the home, your payments could increase significantly. ARMs include rate caps that limit how much the rate can increase per adjustment and over the life of the loan.
FHA Loans
Insured by the Federal Housing Administration, FHA government-backed loans are designed for buyers with lower credit scores or smaller down payments. Key features include a minimum down payment of 3.5% with a credit score of 580 or higher, and the ability to qualify with a score as low as 500 with 10% down. Our first-time home buyer guide covers FHA loans and other assistance programs available to new buyers.
The trade-off is mortgage insurance. FHA loans require an upfront mortgage insurance premium (1.75% of the loan amount) plus annual premiums (0.55-1.05% of the loan amount) for the life of the loan in most cases. This adds meaningfully to your monthly costs.
VA Loans
Available to eligible veterans, active-duty service members, and certain surviving spouses, VA-backed home loans offer no down payment, no private mortgage insurance, and competitive interest rates. They are backed by the Department of Veterans Affairs and are widely considered one of the best mortgage products available.
VA loans do charge a funding fee (typically 1.25-3.3% of the loan amount), which can be rolled into the loan. Some veterans with service-connected disabilities are exempt from this fee.
Jumbo Loans
For loan amounts that exceed the conforming loan limits set by Fannie Mae and Freddie Mac (currently $766,550 in most areas, higher in some high-cost markets), jumbo loans are required. These loans typically need higher credit scores (700+), larger down payments (10-20%), and more substantial cash reserves.
Understanding Interest Rates
Your interest rate is influenced by factors you can control and factors you cannot.
Factors within your control:
- Credit score - higher scores qualify for lower rates
- Down payment - larger down payments often mean better rates
- Debt-to-income ratio - lower ratios signal less risk to lenders
- Loan type and term - shorter terms generally carry lower rates
- Points - paying discount points (prepaid interest) at closing can buy down your rate
Homeowners should also be aware of the IRS mortgage interest deduction, which allows you to deduct interest paid on loans up to $750,000, potentially reducing your overall tax burden.
Factors outside your control:
- Federal Reserve policy and the broader economic environment
- Bond market conditions (mortgage rates tend to follow the 10-year Treasury yield)
- Housing market conditions and lender competition
Always compare offers from multiple lenders. The difference between 6.5% and 6.25% on a $400,000 loan amounts to approximately $24,000 over 30 years. For real estate investors, understanding rate dynamics is especially important since financing costs directly affect cash flow and returns.
Understand Your Loan Estimate
Within three business days of applying, your lender must provide a Loan Estimate form. This standardized document breaks down your rate, monthly payment, closing costs, and fees. Use it to compare offers from different lenders on an apples-to-apples basis. If anything looks unfamiliar, the CFPB's Loan Estimate explainer walks through every section.
Tips for Getting the Best Mortgage
- Check your credit early - review your reports at least six months before applying. Dispute errors and pay down revolving debt to improve your score.
- Shop at least three lenders - include a bank, a credit union, and a mortgage broker to compare rates, fees, and service.
- Get pre-approved, not just pre-qualified - pre-approval involves actual underwriting review and carries more weight with sellers.
- Consider the total cost - a lower rate with higher fees may cost more than a slightly higher rate with lower fees. Compare the annual percentage rate (APR) and closing cost estimates.
- Lock your rate - once you find a good rate, lock it in. Rate locks typically last 30-60 days. Ask about float-down options in case rates drop before closing.
- Avoid financial changes - do not open new accounts, make large purchases, or change jobs between pre-approval and closing.
Your mortgage is one piece of the larger financial picture. Understanding how property valuation works helps you gauge whether the home is priced fairly relative to comparable sales. And if you ever plan to sell your home, your remaining mortgage balance directly affects your net proceeds, so keeping track of your payoff amount matters.