You own a tech company based in California. Business is booming but the high taxes and living costs are eating into your profits. So you decide to pack up and move your headquarters to Nevada where it's cheaper to operate.
Now here’s where California’s law kicks in. Even though you’ve physically moved you’re still selling a lot of software to customers in California. Those sales are enough to trigger California’s “doing business” rules. The state says “Hey you might’ve left but you’re still making money here so you owe us taxes.”
For the next few years as long as your sales in California hit their threshold you’ve got to keep paying California taxes on that revenue. The state is making sure you’re paying your dues for the business benefits and market access you’re still getting even though you’ve crossed state lines. It's like they’re saying “You’re not off the hook just because you’ve moved.”