Quick Answer
Your credit score sets your mortgage rate tier. Lenders price in ~20-point steps, and each tier is worth about 0.125%–0.25%. As of mid-2026, a top-tier score (760+) earns roughly 6.4%, while a sub-640 score can be near 8%. On a $300,000 loan, that spread is about $320 a month and over $116,000 in total interest. The best conventional pricing starts around 740; you can still qualify from 620 (580 FHA), just at a higher rate.
Two people can buy the same house on the same day and get very different mortgage rates — because of their credit scores. It's one of the biggest levers on what you'll pay. Here's exactly how the tiers work and what each one costs.
How credit tiers set your rate
Lenders bucket borrowers into score tiers, typically every 20 points. Each step up is worth about 0.125%–0.25%, and the full spread from top to bottom can exceed 1.5 percentage points.
Rate and payment by credit score (2026)
Illustrative 30-year fixed rates by tier on a $300,000 loan, based on mid-2026 pricing. Actual rates vary by lender and day.
| Credit score | Est. rate | P&I / month | Total interest |
|---|---|---|---|
| 760+ (best) | 6.41% | $1,878 | $376,254 |
| 700–759 | 6.91% | $1,978 | $412,011 |
| 680–699 | 7.15% | $2,026 | $429,439 |
| 640–679 | 7.55% | $2,108 | $458,853 |
| 620–639 | 8.00% | $2,201 | $492,466 |
The top tier saves about $323/month and $116,000 in interest vs the bottom tier. Calculate your payment →
Cross a tier before you apply
Because pricing is tiered, even a small score bump that crosses a boundary can lower your rate. Before applying:
- Pay down credit card balances to lower your utilization.
- Make every payment on time — payment history is the biggest factor.
- Avoid opening new accounts right before applying.
- Dispute any errors on your credit report.
See your payment at any rate with the mortgage payment calculator, and check where rates sit overall in current mortgage rates & 2026 forecast. Lower credit? Compare FHA vs. conventional.