If you’re pre-approved for a card, your interest rate and 0% period are guaranteed – but we still can’t say for certain what your credit limit will be. This is because credit card companies usually only set your credit limit after they’ve performed a hard credit search. But don’t worry if your credit limit isn’t as high as you’d like: many providers will raise your credit limit if you ask, especially if you’ve been using your card responsibly for a few months.