A mortgage is a loan used to buy real estate, where the property itself serves as collateral. If you stop making payments, the lender can take the home through a process called foreclosure. Most homebuyers use a mortgage because few people can pay hundreds of thousands of dollars in cash. You borrow the purchase price (minus your down payment), then repay it in monthly installments over a set period, typically 15 or 30 years.
What Your Monthly Payment Covers
A mortgage payment isn’t just repaying the loan. It has four components, often called PITI: principal, interest, taxes, and insurance.
- Principal is the portion that reduces the amount you actually owe on the home.
- Interest is the cost of borrowing, calculated as a percentage of your remaining balance.
- Taxes refers to local property taxes, which your lender often collects as part of the monthly payment.
- Insurance covers homeowner’s insurance (protecting against damage or liability) and, depending on your loan type, mortgage insurance that protects the lender if you default.
Many lenders require or offer an escrow account, which holds the tax and insurance portions of your payment and disburses them when they come due. This means you don’t have to save separately for a large annual property tax bill; the lender handles it automatically from the funds you’ve already paid in.
How Interest and Principal Shift Over Time
With a fixed-rate mortgage, your monthly payment stays the same for the entire loan term. But the split between interest and principal changes dramatically. In the early years, the vast majority of each payment goes toward interest, with only a small slice reducing your balance. As years pass and the balance shrinks, more of each payment chips away at principal and less goes to interest.
This structure is called amortization. On a 30-year loan at a fixed rate around 4%, you wouldn’t start paying more principal than interest until roughly 12 years in. At higher rates, that crossover point comes even later. Over the full life of the loan, you can end up paying as much as 50% of the original loan amount in total interest. That’s why many borrowers choose a 15-year term or make extra payments toward principal: both strategies significantly reduce the total interest cost.
Common Loan Types
Conventional Loans
These are the most common mortgages and aren’t backed by a government agency. Conventional loans typically require a credit score of at least 620 and a down payment that can be as low as 3% for qualifying borrowers, though putting down less than 20% usually means you’ll pay private mortgage insurance (PMI) until you build enough equity in the home.
FHA Loans
Backed by the Federal Housing Administration, FHA loans are designed for buyers with lower credit scores or smaller savings. You can qualify with a credit score as low as 580 and a 3.5% down payment. If your score falls between 500 and 579, you’ll need 10% down. The tradeoff is mandatory mortgage insurance: an upfront premium rolled into the loan plus an ongoing monthly premium that lasts for the life of the loan in most cases.
VA Loans
Available to active-duty military members, veterans, and their surviving spouses, VA loans require no down payment at all. The VA doesn’t set a minimum credit score, though most lenders look for at least 620. Instead of mortgage insurance, VA loans charge a one-time funding fee that can be financed into the loan. For eligible borrowers, VA loans are often the most affordable option.
How Lenders Decide If You Qualify
Lenders look at several factors when evaluating a mortgage application, but three carry the most weight: your credit score, your income, and your debt-to-income ratio (DTI).
Your DTI compares your total monthly debt payments (car loans, student loans, credit cards, and the proposed mortgage payment) to your gross monthly income. For conventional loans sold to Fannie Mae, the maximum DTI is generally 50% when processed through their automated underwriting system. Manually underwritten loans, where a human reviews the file instead of software, cap DTI at 45% and impose stricter credit score and reserve requirements when the ratio exceeds 36%. FHA loans allow DTIs up to 43%, sometimes stretching to 50% with compensating factors like strong cash reserves.
Beyond the ratio itself, lenders verify your income, employment history, assets, and existing debts. Expect to provide pay stubs, W-2s or tax returns, bank statements, and documentation for any other loans you carry. If new debts surface or your income changes between approval and closing, the lender will re-underwrite the loan, and that could affect your eligibility.
What Determines Your Interest Rate
Mortgage rates are influenced by broad economic forces (inflation, Federal Reserve policy, bond markets) and by your individual financial profile. As of late April 2026, the average 30-year fixed-rate mortgage sits at about 6.23%.
Your personal rate depends on your credit score, down payment size, loan type, and loan term. A higher credit score and a larger down payment signal lower risk to the lender, which typically earns you a lower rate. Shorter loan terms (15 years versus 30) also carry lower rates because the lender’s money is tied up for less time. Even a small rate difference matters: on a $300,000 loan, the difference between 6% and 6.5% adds roughly $100 to the monthly payment and tens of thousands of dollars over the life of the loan.
Fixed-Rate vs. Adjustable-Rate Mortgages
A fixed-rate mortgage locks your interest rate for the entire term. Your payment for principal and interest never changes, which makes budgeting straightforward and protects you if rates rise.
An adjustable-rate mortgage (ARM) starts with a lower introductory rate for a set period, often 5 or 7 years, then adjusts periodically based on a market index. ARMs can save money in the early years, but your payment can increase significantly once the rate starts adjusting. They tend to make the most sense if you plan to sell or refinance before the introductory period ends.
Costs Beyond the Monthly Payment
When you close on a mortgage, you’ll pay closing costs, which typically run 2% to 5% of the loan amount. These cover the lender’s origination fee, the home appraisal, title insurance, attorney fees, and prepaid items like the first year’s homeowner’s insurance or a few months of property taxes for your escrow account.
Some lenders offer “no-closing-cost” loans, but the costs don’t disappear. They’re either rolled into a higher loan balance or offset by a slightly higher interest rate. Over a 30-year term, that can cost more than paying the fees upfront.
After closing, your ongoing costs include property taxes (which can increase over time), homeowner’s insurance, and maintenance. If your down payment was less than 20% on a conventional loan, you’ll also pay PMI until your equity reaches 20% of the home’s value, at which point you can request its removal.