How Credit Scores Affect Mortgage Rates

Mike Starr

Founder, MortgageWizardTools · M.S. Organizational Management

Last reviewed: August 2026

Your credit score directly determines the interest rate you are offered. Lenders use risk-based pricing — borrowers with higher scores get lower rates because they are statistically less likely to default. Even a 20-point difference can change your rate and cost you thousands.

Credit Score Tiers

Score Range	Rate Tier	Impact
760+	Top tier	Best available rates
700-759	Good	Slightly above best
680-699	Fair	Noticeably higher rate
640-679	Below average	Significant rate increase
620-639	Minimum	Highest conventional rate
Below 620	Subprime	Must use FHA or non-prime

Real Cost of a Lower Score

On a $400,000, 30-year fixed loan:

Score	Rate	Monthly Payment	Total Interest
760+	6.25%	$2,462	$486,000
700	6.50%	$2,528	$510,000
660	6.75%	$2,594	$534,000
620	7.25%	$2,729	$582,000

The difference between 760 and 620 is $96,000 in interest — about $267 per month.

Rate Adjustments by Loan-to-Value

Your rate is also affected by your down payment. Lower down payments (higher LTV) can trigger pricing adjustments even with a good credit score. A 740 score with 5% down may get a slightly higher rate than a 740 score with 20% down.

How to Move Up a Tier Before Applying

•Pay down revolving balances — get utilization under 10% for the biggest boost
•Make every payment on time — one late payment can drop your score 50+ points
•Avoid new credit applications — each inquiry can drop your score a few points
•Dispute credit report errors — remove inaccurate negative items
•Become an authorized user — on a family member's well-managed old card

Key Takeaways

•Credit score tiers directly map to mortgage rate adjustments
•The difference between top and bottom tier can cost $100,000+ over 30 years
•Lower down payments can trigger additional rate increases
•Pay down card balances and avoid new credit to boost your score before applying
•Use our Mortgage Payment Calculator to see the impact