why did my FICO score rise 100 pts?

about 4 months ago my FICO score dropped suddenly from 670 to 570. i think it had to do with my applying for a credit card (just $500 limit)..... even though i had paid off a credit card with $4000 balance. now 4 months later my FICO score went back up to 670 even though the $4000 balance is back and I even applied for another credit card. so what gives?

Public Comments

1. When you paid off that $4K credit card, did you close the account? A big part of your credit score is the debt to available credit limit. If you closed that account, you had a big drop in your available credit limit. Also, if you had the account for some time, you closed the credit history. Your score rebounded because you have added cards and additional credit limits. If you pay off the balance and leave the account open, you'll have another increase in your score. Besides, you don't want to pay all that interest and sink into debt.