A mortgage is a loan secured by the house itself, and nearly every term in the process — rate, points, escrow, PMI, DTI — exists to price the risk of that arrangement. Understanding the basics takes an afternoon and saves you thousands over the life of the loan. This guide covers how mortgages work, how pre-approval fits in, and how to compare loan offers without a finance degree.
First, the market context. Freddie Mac’s Primary Mortgage Market Survey showed the 30-year fixed-rate mortgage averaging 7.18 percent and the 15-year fixed 6.57 percent as of early November 2026 (freddiemac.com). Rates move weekly, and during the period covered by NAR’s 2025 buyer survey, mortgage interest rates averaged 6.69 percent (nar.realtor). Whatever the headline number, the rate you are offered depends on your credit, down payment, loan type, and how well you shop.
Mortgage Terminology in Plain English
- Principal and interest: the loan balance and the cost of borrowing it, paid monthly in a fixed amortization schedule.
- Rate vs. APR: the rate sets your interest; the APR folds in certain fees for an apples-to-apples comparison.
- Points: prepaid interest that buys down your rate. Worth it only if you keep the loan long enough to recoup the cost.
- PMI: private mortgage insurance, typically required on conventional loans with less than 20 percent down; it protects the lender, not you.
- Escrow account: a lender-held account that collects property taxes and insurance premiums monthly and pays them on your behalf.
- DTI (debt-to-income ratio): monthly debt payments divided by gross monthly income — the core qualifying number.
The Main Loan Types
Conventional loans
Not insured by the government, conforming to Fannie Mae and Freddie Mac limits. Down payments can be small: Fannie Mae’s HomeReady program requires as little as 3 percent down for eligible buyers (yourhome.fanniemae.com). Under 20 percent down generally means PMI until you build sufficient equity.
FHA loans
Insured by the Federal Housing Administration, these are the workhorse of first-time buying: 3.5 percent down with a FICO score of 580 or higher, and 10 percent down for scores from 500 to 579 (fha.com). The trade-off is mortgage insurance premiums that generally last the life of the loan unless you refinance.
VA loans
Guaranteed by the Department of Veterans Affairs for eligible service members, veterans, and surviving spouses, VA loans are notable for requiring no down payment and no monthly mortgage insurance (va.gov).
USDA loans
Government-backed loans for eligible rural and suburban areas, also available with no down payment for qualifying households and properties.
Prequalification vs. Pre-Approval
The Consumer Financial Protection Bureau notes that lenders use these terms differently — some use them interchangeably — but generally prequalification is an estimate based on information you provide, while pre-approval involves the lender verifying your income, assets, and credit. Neither is a guaranteed loan offer (consumerfinance.gov). In practice, a full pre-approval with a verified file is what listing agents want to see attached to your offer, because it signals the financing is likely to survive underwriting.
How Much Can You Borrow?
Lenders run two ratios. The front-end ratio compares housing costs to income; the back-end ratio includes all recurring debts. FHA guidance treats 43 percent as the standard back-end DTI benchmark, though automated underwriting can approve higher ratios — commonly into the 50s — when compensating factors like cash reserves or residual income are strong (fhanow.com). Conventional programs use similar ceilings. But the lender’s maximum is not your budget: build in the maintenance reserve that ownership demands — Fannie Mae’s guidance suggests 1% to 4% of home value per year (yourhome.fanniemae.com) — before you commit to the top of your approval range.
How to Get Pre-Approved
- Gather documents: 30 days of pay stubs, two years of W-2s or tax returns, two months of bank statements, and identification.
- Apply with multiple lenders within a short window: credit scoring models typically treat multiple mortgage inquiries in a focused shopping period as a single inquiry.
- Compare Loan Estimates line by line: your lender must send a Loan Estimate within three business days of receiving your application (consumerfinance.gov), and the same form makes different lenders’ fees directly comparable.
- Keep your finances quiet afterward: no new debt, no job changes, no large unexplained deposits until after closing.
Rate Locks and Points
Once your offer is accepted, ask about locking the rate. A lock holds your rate for a set period — commonly 30 to 60 days — and longer locks may cost more. Points only make sense if you will keep the loan past the break-even point: divide the upfront cost of the points by the monthly savings to find how many months it takes to come out ahead.
Also decide fixed versus adjustable. A fixed-rate mortgage keeps the same payment for the life of the loan; an adjustable-rate mortgage starts lower but resets with market rates after an initial period. Adjustable loans can work for buyers who plan to sell or refinance before the first reset — but only if the plan holds, so weigh the certainty of a fixed payment against the savings an ARM offers in the early years.
Choosing Between Offers
The cheapest loan is not always the lowest rate. Compare the APR, the total lender fees, the PMI terms, and the prepayment picture. If you are selling a home at the same time, coordinate the two closings carefully — our guide to selling your house covers the seller’s side of that timing. And once you own the place, what you do with the house matters as much as how you financed it: the home maintenance checklist keeps your equity intact. If you are earlier in the process, our guide to buying your first home covers the search side.
Frequently Asked Questions
How long does mortgage pre-approval take?
Often a few business days if your documents are ready, since the lender is verifying income, assets, and credit. The pre-approval letter itself is typically valid for 60 to 90 days and can be updated as your search continues.
Does pre-approval hurt my credit?
A mortgage application involves a hard inquiry, but credit scoring models generally treat multiple mortgage inquiries within a focused shopping window — often about two weeks — as one inquiry. Shop deliberately in that window instead of spreading applications over months.
Should I get pre-approved by more than one lender?
Yes. Get at least three Loan Estimates on the same day for the same loan amount. Fees and rates vary far more between lenders than most buyers expect, and the Loan Estimate was designed to make that comparison easy.
What is a good debt-to-income ratio?
Lower is better, and many lenders want to see back-end ratios in the mid-40s or below. FHA guidance uses 43 percent as a standard benchmark with higher ratios possible on strong files, but borrowing to the maximum leaves no room for maintenance, repairs, or life changes.
Is it better to make a bigger down payment or keep cash in reserve?
Balance both. A larger down payment lowers your payment and may remove PMI, but an empty savings account after closing is one of the most common first-year mistakes. Keep a maintenance and emergency reserve even if it means putting less down.