Keep in mind that this will differ from institution to institutions, but in most cases, you will be asked to cover 100% of the credit line. This means that if you have a limit of $3,000 on a secured credit card you would be asked to deposit the same amount as collateral. Most institutions will not even issue a secured card over $5,000 and in rare occasions up to $10,000. If you are in need of a higher credit line you might want to look into other security instruments like secured loans.