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Say your most recent balance on the card was $2,000. That appears to be a very high usage of credit when your substitute limit is just $2,500, not the actual $5,000. Now you appear to have a utilization ratio of 80 percent and your credit score could be depressed significantly -- 20 to 50 points or more -- according to Terry Clemans, executive director of the National Credit Reporting Association.
A 50-point decrease could mean a 1 percentage point difference in your mortgage rate quote, according to Fair Isaac's MyFico.com Web site. On a $216,000 fixed-rate, 30-year mortgage last week, an applicant with a 660 FICO would typically be quoted 7.07 percent, or $1,447 a month in principal and interest. An applicant with a 610 FICO would be quoted 8.05 percent, with a payment of $1,592, or $145 more.