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With the Merrick Bank Double Your Line® Mastercard® card, your initial credit line may be doubled after 7 months of responsible use of the card, if your account qualifies.

For the Merrick Bank Double Your Line® Secured Credit Card, your $200 credit line will double to $400 if you make at least your minimum payment on time each month for the first 7 months your account is open. You can also increase your credit line by adding more money to your security deposit at any time, up to $3,000. However, Merrick Bank will only double the original $200 amount and only once. After you've received your $200 increase, your account will be regularly reviewed for credit line increases without the need for an additional deposit.

As an alternative, you might want to consider the Surge® Platinum Mastercard®. It is an unsecured credit card that can be an effective tool for building credit as the issuer reports your activity to the three major credit bureaus. Additionally, the card issuer performs free automatic account reviews and may double your initial credit line up to $2,000 after six months of on-time payments.