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Today, there are credit cards that promise to double your line after responsible use of the credit card for some time. "Double your line" offers are usually one-time offers and have some requirements, meaning you can take it or leave it.

The requirements of double your line offers are not usually hard to meet. Cardholders are typically required to simply make all monthly payments on time for a specified period of time (for 6 - 8 months on average).

When you meet all the requirements, the credit limit increase is automatic. However, just to be on the safe side, you can call the issuer and confirm you qualify for the increase and when you will see your credit line double.

Some of the popular credit cards that offer "double your lone" deals are the Merrick Bank Double Your Line Credit Card, Surge® Platinum Mastercard® and FIT™ Platinum Mastercard®.