My decision would depend on how hungry I am. It's difficult for me to imagine being in a position where I would disclose previous salary information, at this po

My decision would depend on how hungry I am. It's difficult for me to imagine being in a position where I would disclose previous salary information, at this point in my career. It's irrelevant. I should be paid what I'm worth to this company at the present moment, which has nothing to do with what I may have earned elsewhere. I personally would not submit the form until I've had a conversation with someone. I'd tell them, in writing, I won't share my salary history, and then ask how I should proceed on the background check form without it. I would not submit a null value without giving them a heads up. That said, if you really want or need the job, feel free to make an exception.