Increasing your credit limit can be achieved by updating income details, calling card issuers, using your card responsibly, or applying for a new card. It's best to ask for an increase when you've got a raise, have good credit, or a strong track record. Avoid asking after applying for new credit, if you've had a decrease in income, or before traveling overseas. A credit limit increase may involve a hard inquiry, which can impact your credit score. If denied, improve your credit and try again later.