Canadian citizen with U.S. LLC: How to handle income from Canadian corporation?

I’m a Canadian citizen living in California with a U.S. based LLC. I’m planning to set up a Canadian corporation to handle a consulting contract with a client in Canada. The Canadian company would then subcontract the work to my U.S. LLC, which is where I do all the actual work.

Trying to get clarity on:

What are the U.S. tax implications of this structure?

Can I just pay the U.S. LLC from the Canadian corp like a vendor?

Do I have to report foreign business ownership on FBAR/5471 if I’m sole director of the Canadian entity?

Any red flags with transfer pricing or IRS audits? I want to make sure I get ahead of these things to the best of my ability.

Would love to hear from anyone who’s done this, thanks in advance!