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Your credit score is the single most influential factor in your mortgage rate. The difference between a mediocre and excellent score can mean tens of thousands of dollars over the life of your loan. Here is exactly how credit scores translate to mortgage pricing, with real-world examples.

FICO Score Tiers and Rate Impact

Mortgage pricing uses FICO tiers with specific adjustments. At 780+, you get the best available rates with zero credit-based adjustments. At 740-779, you see minimal adjustments (0-0.25% in price). At 700-739, adjustments increase to 0.25-0.5%. At 680-699, you see 0.5-1.0% price adjustments. At 660-679, adjustments are 1.0-1.75%. Below 660, expect 1.75-3.0% in price adjustments. In rate terms, each tier roughly translates to 0.125-0.25% in rate difference.

Monthly Payment Examples

On a $400,000 30-year fixed mortgage at 80% LTV: A 780 FICO borrower might get 6.25% ($2,463/month). A 720 FICO borrower might get 6.50% ($2,528/month, $65 more). A 680 FICO borrower might get 6.875% ($2,628/month, $165 more). A 640 FICO borrower might get 7.25% ($2,729/month, $266 more). Over 30 years, the difference between 780 and 640 FICO is $95,760 in additional interest.

Quick Wins to Boost Your Score

Pay down credit card balances to below 10% utilization (biggest single impact). Do not close old credit cards - age of accounts matters. Become an authorized user on a family member's long-standing account with perfect history. Dispute any errors on your credit reports. Set up autopay for all bills to avoid missed payments. Avoid applying for new credit in the 6 months before your mortgage application. If your score is borderline, even a 20-point increase can move you to a better tier and save thousands.