Improving your credit score can be as simple as asking for a higher card limit. Really, it's true.
The trick is to ask for a higher limit on your existing cards. However, most people don't bother, according to a new report from Bankrate.com, which surveyed 1,000 people ages 18 and older by phone April 14-17.
By increasing your credit limit — assuming you don't go on a spending spree — you reduce what's known as your utilization ratio, which boosts your credit score.
While 8 in 10 Americans get approved for a higher limit, less than 30 percent of cardholders surveyed asked for one. And your age helps. Those over age 30 are much more likely to get approved compared with younger millennials, the study found.
"It's a good time to be negotiating anything with a credit-card issuer, because banks are doing whatever they can do to attract new customers," said Matt Schulz, CreditCards.com's senior industry analyst.
Your credit utilization ratio is a percentage calculated by adding up your outstanding balances divided by the available credit limit on all your cards. Increasing your limit lowers this ratio (assuming you keep spending in check).
Keeping spending to 30 percent or less of your limit is best, according Beverly Harzog, a credit card expert and author of "The Debt Escape Plan."