I have a sole proprietorship, no Federal tax id, I'm using my SSN and a Hawaii GET license.

I am looking to get a small business credit card. Do you need to get a federal tax ID first? Or can I apply for the card using my SSN? Is it possible for a sole prop to get a small business credit card or do I have to use my personal card?

Many thanks!

You can get one for your business, there is an option for any entity. Everything would/will affect your personal credit though.