Your credit score can be the difference between getting a good mortgage and getting troubles  with higher monthly payments.

And with lenders tightening their standards, it's even more important that you improve your credit score as much as you can. We're going to tell you how.

Most mortgage lenders look at your FICO score. It is your payment history, which makes up the biggest chunk of your score, looks at how often you pay your bills on time. The amount of debt you owe is considered equally important. The amount of time you've had your credit cards and how much new credit you apply for all play a role in determining your score.

Credit bureaus can predict how much of a credit risk you are by how you handle credit card debt more than any other kind of debt, like student loans. That's because with installment loans, like mortgage payments, there is a predetermined amount you pay each month. With credit cards, you're in control of what debts you have.

Even if you pay your bills off every month, the amount you paid will be listed on your credit report. And if you spend more than 50 percent of your credit limit, that's going to negatively impact your score. In fact, you could lower your score 60 or 70 points.

And that could make the difference between getting a good mortgage rate and a bad one. If you're within three months from applying for credit, make sure you don't charge a lot on your cards, or split the purchases between a few cards, so you keep the balances down.

As we mentioned, your FICO score looks at how long you've managed your credit. So the longer you've managed your credit wisely, the better your score. If, for example, you have a card that is at least 5 or 6 years old, it's not a good idea to close those accounts.

At the same time, opening any new lines of credit - whether it's a retail credit card or a new car loan - will almost certainly lower your score by a few points.