Mortgages have a reputation for being complicated. Some of that reputation is deserved — there are real moving parts, and the wrong decisions cost real money. But a lot of the confusion comes from terminology that sounds technical but isn’t, and from a process that’s unfamiliar rather than actually difficult. Here’s the plain-English version.
The Four Factors That Determine Your Rate
Credit score is the biggest single factor. Lenders tier their rates by credit score brackets — a 760 score typically gets a meaningfully better rate than a 680, even with identical income and down payment. Before you apply, pull your credit report (free at annualcreditreport.com), check it for errors, and understand where you stand. Errors on credit reports are more common than most people realize and disputing them before applying can improve your score quickly.
Down payment affects both your rate and your monthly cost. Putting down 20% eliminates private mortgage insurance (PMI), which can add $100-$300 per month on a typical Georgia home loan. Putting down less than 20% doesn’t disqualify you — it just changes the cost structure. FHA loans allow 3.5% down; conventional loans allow 3-5% down for first-time buyers. The right answer depends on your cash reserves, your rate sensitivity, and how long you plan to hold the property.
Loan type (FHA vs. conventional vs. USDA vs. VA) affects both rate and mortgage insurance structure. FHA loans carry both upfront and annual mortgage insurance regardless of down payment. Conventional loans allow PMI cancellation at 20% equity. USDA and VA loans have different fee structures. Matching the right loan type to your situation is one of the most important decisions in the process.
Loan term — 30-year vs. 15-year vs. other options — affects your rate and monthly payment. 15-year rates are typically 0.5-0.75% lower than 30-year rates, but the monthly payment is significantly higher because you’re paying it off in half the time. Most buyers choose 30-year for cash flow flexibility and refinance to 15-year later if their income supports it.
Debt-to-Income Ratio: The Number Lenders Care About Most
Your debt-to-income (DTI) ratio is your total monthly debt payments divided by your gross monthly income. Most conventional lenders want to see total DTI (including the new mortgage payment) at or below 45%. FHA allows up to 57% in some cases. USDA has its own guidelines.
What counts as debt: minimum credit card payments, car loans, student loan payments, any other installment loans. What doesn’t count: utilities, phone bills, subscriptions, insurance.
If your DTI is high, you have two levers: pay down existing debt (reduce monthly payments) or increase income documentation. Sometimes reframing income documentation — adding a co-borrower, documenting side income, restructuring how business income is reported — changes the DTI picture meaningfully.
Broker vs. Bank: Why It Matters
A bank lends you their own money and offers only their own products. A mortgage broker works with dozens of lenders simultaneously, shopping your file across the market to find the best combination of rate, fees, and program for your specific situation.
For straightforward loans with strong credit and conventional income, the difference may be modest. For buyers with self-employment income, non-traditional employment history, credit challenges, or unique property types, the broker’s ability to access multiple lending platforms can be the difference between getting a loan and not — and between a good rate and a great one.
Broker compensation is disclosed upfront and regulated. There’s no hidden cost to using a broker versus going directly to a bank.
The Lock: When and How Long
Once you’re under contract and your loan is approved, you’ll lock your interest rate for a set period — typically 30, 45, or 60 days. Rate locks prevent the market from moving against you while you close. Longer locks cost more (usually priced into the rate). If closing takes longer than your lock period, you’ll need to extend or relock, which can cost money depending on market conditions.
Lock timing matters. Locking too early (before you’re under contract) or too late (if rates are moving against you) both have consequences. A good broker advises on timing based on current market conditions and your specific timeline.
What Happens If Rates Are High When You Buy
The phrase I use most often with buyers concerned about rates: “Marry the house, date the rate.” You own the house for years; you can refinance the rate whenever it makes financial sense. Buying at a higher rate in a period of less competition often means you buy a better home at a better price — and you refinance when rates come down.
Waiting for rates to drop before buying has an opportunity cost that’s often underestimated: the home prices you’re watching tend to rise as rates fall and more buyers enter the market. The timing trade-off rarely works out the way people hope.
The best time to buy is when you’re financially ready, you’ve found the right home, and the numbers work for your budget. Rate markets are unpredictable; your life timeline usually isn’t. Plan accordingly.