You’ve been laid off from your job. The ensuing drop in your income could hurt your FICO score.

FHA has a two-tier credit score system for insuring loans. First-tier loans require a minimum down payment of 3.5 percent, while second-tier loans require at least 10 percent. The first tier includes those with FICO scores of 580 or above, while the second tier includes those between 500 and 579. FHA does not insure loans with anything below a 500 credit score.

Your credit score can make a huge difference in your finances, from helping you qualify for loans and low interest rates to accessing utility services and renting the home you want. As much as people want to have good credit scores, there’s a lot of confusion about how they work.

With the average FICO credit score estimated at 690 (the highest possible score is 850), chances are most Americans wouldn’t mind some advice on how to improve. Of all consumers, just 25 percent have managed to achieve a score of 785 or higher.

Wells Fargo has a limited-time offer for customers where they’ll give you a free credit score and free credit report through November 16, 2014. Unfortunately, the score you get is not your real FICO score. It is a made up score calculated with the bank’s own proprietary scoring model.