You will have to answer questions relating to investments you have, whether you have a criminal record relating to financial fraud etc. It's part of whatever they call the "Integrity" training.
If you are thinking of bad credit, that should not be a problem.
You might have a problem getting security clearance depending on what your issue, and what level of clearance you require. SC is standard, but if you were aiming to go any higher you would know about this anyways.