What will happen to my SEP…

I am currently a sole proprietor, and opened a SEP IRA earlier this year. I am now having discussions with another individual in my field regarding the formation of a partnership. I’ve begun wondering what would happen to my SEP if I form a partnership, and am no longer considered a sole proprietor? Would there be any benefit to keeping part of my business separate so I can continue to contribute to the SEP as a sole proprietor? Thanks for any advice, as I’m fairly new to investing, and don’t want to mess up what I’ve started!