Increasing your limit shouldn’t be hard if you pay your bills on time. Just make sure to build your case. Tell the representative that you speak with about your long standing payment history with no late payments. Let them know if you recently received a raise at work. Be honest about how you plan on using the limit increase and how you plan to pay any new purchases off.
Every time you apply for credit, your credit report is accessed and analyzed. Every time your credit report is accessed a record of this transaction is placed on your credit report and it is called an inquiry. Inquiries can drop your credit score by as much as 5 points a piece. If you are looking to get new credit, be sure you will qualify for the credit card or loan so you do not have unnecessary inquiries on your credit report. In addition, having a lot of new credit (10% of your score) looks risky to lenders, and your score will suffer.
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This is easier said than done, but reducing the amount that you owe is going to be a far more satisfying achievement than improving your credit score. The first thing you need to do is stop using your credit cards. Use your credit report to make a list of all of your accounts and then go online or check recent statements to determine how much you owe on each account and what interest rate they are charging you. Come up with a payment plan that puts most of your available budget for debt payments towards the highest interest cards first, while maintaining minimum payments on your other accounts.