Your credit score is one of the biggest levers on your mortgage rate, and a better score can save you real money every month for decades. If you're planning to buy or refinance, a little credit work beforehand pays off more than almost anything else. Here's what actually moves the number.

Pay every bill on time

Payment history is the single biggest factor in your score, and one late payment can do lasting damage. Automate at least the minimum on every account so a busy month never costs you. If you've slipped before, the impact fades as on-time months stack up — consistency is the cure.

Lower your credit utilization

Utilization is your card balances divided by your limits. Keep it under 30%, and under 10% is better. Paying balances down before the statement closes — not just before the due date — means a lower number gets reported, which can lift your score within a month.

Check your reports and dispute errors

You're entitled to free credit reports, and errors are common — accounts that aren't yours, wrong balances, a paid debt still showing as owed. Any one of them can drag your score down. Dispute mistakes; correcting them is free and can produce a fast jump right when you need it.

Don't open new credit before you apply

Every new application triggers a hard inquiry and can lower the average age of your accounts — both small negatives. In the months before a mortgage, avoid financing a car, opening store cards, or taking on new debt. Lenders also like to see stable, predictable credit behavior.

Keep old accounts open

Length of credit history helps you, so resist closing your oldest cards. If a card has no annual fee, keep it open with a small recurring charge so the issuer doesn't close it for inactivity.

Mind the rate-shopping window

When you do shop for a mortgage, multiple inquiries within a short window (about 45 days) count as a single inquiry — so comparing lenders to find your best rate won't hurt your score.

The bottom line

Pay on time, keep balances low, fix report errors, and hold steady on new credit before you apply. None of it is flashy, but stacked together over a few months it reliably raises your score — and a higher score is the cheapest way to a lower mortgage rate.

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