Mortgage rate headlines are designed to get your attention, not to tell you what you’ll actually pay. The advertised rate assumes a 20% down payment, a 780 credit score, a single-family primary residence, and no discount points — conditions that don’t describe most buyers. Here’s how to read rates accurately and what they mean for your specific payment.
Why the Rate You See Online Isn’t Your Rate
Lenders quote rates based on a “best-case” borrower profile. Your actual rate is priced based on a set of risk adjustments called loan-level price adjustments (LLPAs) — essentially add-ons that move your rate up based on factors that make your loan slightly riskier to the lender.
Factors that typically raise your rate:
- Credit score below 740–760
- Down payment below 20% (LTV above 80%)
- Second home or investment property (vs. primary residence)
- Loan balance above conforming limits (jumbo loans)
- Cash-out refinance (vs. rate-and-term)
A buyer with a 700 credit score and 10% down might be quoted a rate 0.5%–0.875% higher than the headline rate for an otherwise identical loan. On a $400,000 loan, that gap matters considerably.
How a 0.25% Rate Move Changes Your Monthly Payment
The relationship between rate and payment is not intuitive until you see the numbers side by side.
On a $350,000 loan (30-year fixed):
| Rate | Monthly P&I | Total interest over 30 years |
|---|---|---|
| 6.50% | $2,213 | $446,680 |
| 6.75% | $2,270 | $467,200 |
| 7.00% | $2,329 | $487,980 |
| 7.25% | $2,388 | $509,120 |
| 7.50% | $2,447 | $530,600 |
A 0.25% difference in rate changes your monthly payment by roughly $57 on a $350,000 loan — and roughly $20,000 in total interest over the life of the loan. On a $500,000 loan, multiply those figures by about 1.4.
This is why comparison shopping for your rate matters as much as negotiating the purchase price. A half-point reduction in rate on a $400,000 loan saves you more over 10 years than negotiating $5,000 off the purchase price.
Rates are indicative and may not reflect your individual quote.
Fixed vs. Adjustable Rates: The Short Version
A fixed-rate mortgage locks your interest rate for the life of the loan. Your P&I payment never changes. Most buyers choose this.
An adjustable-rate mortgage (ARM) has a fixed period (commonly 5, 7, or 10 years) followed by annual adjustments based on a market index. ARMs typically start with a lower rate than a comparable fixed loan — the tradeoff is that your payment can increase after the fixed period ends.
ARMs can make sense for buyers who are confident they’ll sell or refinance before the adjustment period begins. They’re a meaningful risk if you plan to stay long-term and rates are high when adjustments kick in.
When and Why to Lock Your Rate
A rate lock is a commitment from the lender to hold a specific rate for a defined window — typically 30, 45, or 60 days — while your loan processes. If rates rise during that window, you keep your locked rate. If rates fall, you generally don’t benefit unless your lender offers a “float-down” option (some do, for a fee).
When to lock: Most buyers lock once they have a signed purchase contract and the lender has verified the basics of their application. Locking earlier than that is rarely possible; locking later means carrying rate risk through the processing period.
What happens if closing is delayed: Locks can usually be extended, but at a cost — either a fee or a slight rate bump. Factor this into your budget if you’re buying a new-construction home with an uncertain completion date.
Rates move daily — sometimes significantly. If you’re within 60 days of closing and you see a rate you’re comfortable with, locking it is usually the right call. Trying to time the market for a slightly better rate is a gamble that sometimes costs real money.
Comparing Loan Quotes
When you receive quotes from multiple lenders (which you should — see the guide to comparing mortgage rate quotes for the mechanics), compare APR alongside the interest rate. The annual percentage rate (APR) folds in origination fees and points, making it a more apples-to-apples comparison across different lender fee structures.
Use the Loan Comparison tool to enter two or more quotes and see the total-cost difference over your expected hold period — not just the monthly payment difference, which can be misleading if one quote includes discount points.