FINANCIAL FITNESS: Elliot Grandia explains three ways to improve your credit scoreA low credit score can prevent you from making large purchases, securing crucial loans, or even renting a home. But what causes your credit score to drop in the first place? FINANCIAL FITNESS: Elliot Grandia explains retirement investment optionsThe two biggest factors are missed payments and running up large credit card balances. I say, hey, let's leave that credit card open to keep a good credit score going for us," David said. These small, simple steps can help you improve your credit score in just a matter of months if you stay vigilant.