Can you improve your credit score?
The answer is both yes and no!
It's virtually impossible to change your score in the time between when most people decide to buy a home or refinance their mortgage and when they apply. Because, the timing is too close from the time the application is taken and when the loan is closing. To fix this ploblem get yourself pre-approved well before you find your home, the best time to get pre-approved is before you start looking for that next new home. So the short answer is, you really can't "on the spot." But there are strategies you can live with to make sure that when you do apply for a loan your score is as high as possible, earning you the best affordable mortgage.
Make sure that the information each of the three credit reporting bureaus has on you is consistent and up to date. Order a copy of your credit report about once a year, and dispute any inaccuracies. You can order your credit report once a year without it having an effect on your credit scores.
Note: Theoretically, if a series of credit reports is requested on your behalf during a limited amount of time, your score goes down until time passes without any inquiries. Changes in the law though have made "consumer-originating" credit report requests not count so much. Also, a series of requests in relation to getting a mortgage or car loan is not treated the same as a number of credit card requests in a limited time. This is because the credit bureaus, and lenders, realize that people request their own credit reports to keep up with what's on them, and smart consumers shop around for the best mortgage and car loans.
Unsolicited credit card solicitations in the mail don't count against your credit report, so don't worry.
The two main components of your credit score are your payment history and the amounts you owe. Bankruptcy filings and foreclosures, which can stay on your credit report for as long as 10 years, can significantly lower your score. It's never a good idea to take on more credit than you can handle.
Late payments work against you. It's extremely important to pay bills on time, even if it's only the monthly payment.
Don't "max out" your credit lines. Since the size of the balance on your open accounts is a factor, lower balances are better. To the credit bureaus a maxed out credit card is any card that is 60% of the available balance.
It's said that by carefully managing your credit, it's possible to add as much as 50 points per year to your score. I have help many borrowers increase their credit scores in as short as 30 to 45 days, and I work for free. But, if time is short I work with several different credit repair companies that for a fee will bring your credit score up significantly.