Credit Scores and Your Mortgage
Your credit score is the single biggest lever on the rate you're offered. Here's how the tiers work, what they cost over 30 years, and how to move up a band.
Your credit score is the single biggest factor — after the loan amount itself — in the mortgage rate a lender offers you. The same loan, on the same house, in the same week, can carry a rate a full percentage point apart for two borrowers whose only real difference is a credit score. Lenders price risk in tiers, and moving from one tier to the next can be worth tens of thousands of dollars over the life of the loan.
Price what a rate change actually costs you with the Mortgage Calculator, then use the framework below to understand where your score puts you.
How a score becomes a rate
Mortgage lenders don’t read your score as a single number; they sort it into bands and attach a price to each band. The highest tier gets the best advertised rate, and every step down adds a margin. The exact thresholds vary by lender, but the structure is consistent across the market:
| Credit score band | Typical rate position | What it means for you |
|---|---|---|
| 760+ | Best available rate | Top tier — you see the rate in the ads |
| 740–759 | About +0.1–0.2% | Strong; small premium over the top |
| 700–739 | About +0.3–0.5% | Good; a noticeable but modest step up |
| 660–699 | About +0.5–0.9% | Fair; rate premium becomes meaningful |
| 620–659 | About +1.0%+ | Qualifies for conventional, but priced high |
| Below 620 | Government loans only | Conventional door usually closes |
The rate spreads above are illustrative of how tiers stack, not a live rate sheet — actual gaps move with the market. The takeaway is the shape: the jump from “good” to “excellent” is often worth more than borrowers expect, and it sits within reach for many.
Minimum scores by loan type
Each loan program sets a floor. Hitting the floor gets you in the door; it does not get you the best price. The published minimums:
- Conventional (Fannie Mae / Freddie Mac): generally 620. Below the mid-700s you’ll also pay higher risk-based pricing adjustments, and private mortgage insurance costs more.
- FHA: 580 with a 3.5% down payment; 500–579 is technically allowed with 10% down, though many lenders won’t go that low.
- VA: no minimum set by the VA, but most lenders apply an overlay around 620.
- USDA: no official minimum, with lenders typically wanting 640 for streamlined processing.
That word — overlay — matters. A lender overlay is a stricter requirement the lender adds on top of the program’s official rule. The VA may set no floor, but the bank writing the loan can, and usually does. This is one reason it pays to shop more than one lender if your score is on a boundary. Compare offers using How to Shop for a Mortgage.
What’s actually in a FICO score
The FICO score most mortgage lenders pull is built from five categories, weighted roughly like this:
| Factor | Weight | What moves it |
|---|---|---|
| Payment history | 35% | On-time vs. late payments, collections |
| Amounts owed | 30% | Balances vs. limits (credit utilization) |
| Length of credit history | 15% | Age of your oldest and average accounts |
| New credit | 10% | Recent applications and hard inquiries |
| Credit mix | 10% | Variety of account types |
Two of these — payment history and amounts owed — make up nearly two-thirds of the score, and they’re also the two you can influence fastest. A single 30-day late payment can drop a strong score by dozens of points; paying a maxed-out card down to a low balance can lift it by a similar margin within a billing cycle or two.
What a better score is worth: a worked example
Consider a $320,000 loan over 30 years. Watch how the monthly payment and total interest move as the rate steps down with each credit tier:
| Credit tier | Rate | Monthly P&I | Total interest (30 yr) |
|---|---|---|---|
| 620–659 | 7.50% | $2,237 | ≈ $485,400 |
| 700–739 | 6.75% | $2,076 | ≈ $427,300 |
| 760+ | 6.25% | $1,970 | ≈ $389,300 |
Going from the 620–659 tier to the 760+ tier in this example trims the payment by $267 a month and saves roughly $96,000 in interest across the loan. That is the prize for moving up two bands — and it’s why a few months of focused credit work before you apply can out-earn almost anything else you do during the process. Run your own loan amount through the Mortgage Calculator to see your version of this table.
How to raise your score before you apply
You don’t need a perfect score; you need to cross the next tier boundary. The fastest-moving levers, roughly in order:
- Pay down revolving balances. Credit utilization is 30% of the score and updates monthly. Getting each card — and your total across cards — well below 30% of its limit, ideally under 10%, can move a score quickly.
- Don’t close old cards. An old account lengthens your history and adds to your available credit. Closing it can shorten history and spike utilization at the same time.
- Make every payment on time, every month. Payment history is the largest factor. One missed payment can undo months of progress.
- Leave new credit alone. Don’t open a new card or finance a car in the months before you apply — new accounts lower your average age and add a hard inquiry.
- Dispute genuine errors. Pull your reports, and if you find an account that isn’t yours or a paid debt marked unpaid, dispute it. Corrections can post within a cycle.
A practical rule: if your score is within a handful of points of a tier boundary (say, 738 reaching for 740), a single utilization paydown before you apply can be worth more than any negotiation at the closing table.
The rate-shopping window: shop without fear
A common worry is that applying to several lenders will tank your score with hard inquiries. The scoring models account for exactly this behavior. Multiple mortgage inquiries within a focused window — generally 14 to 45 days depending on the model — count as a single inquiry for scoring purposes. The system assumes you’re rate-shopping one loan, not opening five.
So shop deliberately: gather your quotes inside a tight window — two or three weeks is comfortable — and the cluster of pulls dings your score once, not five times. A single inquiry typically costs only a few points and fades within months. The penalty for not shopping — accepting the first rate offered — is far larger and lasts the whole loan.
Where to go next
- See how a lower rate changes your payment with the Mortgage Calculator.
- Decide whether to buy down your rate using the Mortgage Points Calculator.
- If you already have a loan, check whether a better score now justifies a refinance, and read When to Refinance.
- New to the process? Start with the First-Time Home Buyer Guide.
Frequently asked
Which credit score do mortgage lenders use? Most use a FICO score, and often pull all three bureaus (Equifax, Experian, TransUnion) and use the middle of the three. For two applicants, they typically use the lower of the two middle scores.
Will checking my own credit hurt my score? No. Checking your own report is a “soft” inquiry and never affects your score. Only a lender’s “hard” pull when you apply can.
How long does it take to raise a score? Utilization changes can show up in a billing cycle or two. Rebuilding from a late payment or collection takes longer — months, not weeks — which is why it’s best to start before you shop for a home.
This guide is general educational information, not financial advice. Confirm specifics with a licensed lender or advisor.