For those of us who don’t live in California (or even the United States), it’s understood that there are plenty of great technology companies outside of California.

But even so, California, and in particular Silicon Valley, has a reputation for being the world’s tech hub. And to be honest that’s probably fair given the number of great technology companies that have come out of California and Silicon Valley over the years.

But an interesting thread on the WebmasterWorld message board discussing a new proposed tax law in California that would tax out-of-state companies that maintain a network within the state:

AB 178 would provide that out-of-state companies which maintain a network in California and thus have a presence in the state would therefore be required to collect sales tax on orders received from within California. New York passed a similar law, and was sued by The New York Supreme Court dismissed Amazon’s claim, based on an extensive body of legal decisions defining the nature of nexus and upheld New York’s right to levy the sales tax.

“This legislation will close the current loophole in California tax law which has allowed out-of-state companies to avoid collecting California sales and use tax,” said Assembly member Nancy Skinner (D – Berkeley). “During this unprecedented fiscal crisis we cannot afford to lose sales tax revenue from out-of-state companies when our own local businesses are struggling to keep their doors open.”

Needless to say this has some people concerned. A lot of the discussion on WebmasterWorld was related to just how far-reaching the impact of this new tax law might be.

I have several friends in California and caught up with one recently. We spoke about the economy and he explained how bad the economy was there. The state’s unemployment rate is now over 10% and California has been one of the states hardest-hit by the foreclosure crisis. Thanks to a massive budget deficit, taxes are being increased. The sales tax in the state is going up on April 1; some areas will have sales tax exceeding 10%. Added on to an already unfavorable corporate tax structure and high cost of living, I asked the obvious: how can a business survive?

No answer.

Maybe I’m missing something but given the economics of running a business in California, it seems to me that you’d have to be crazy to want to set up shop there. Instead, it seems like it’s one of those places you’d actually want to avoid it like the plague.

Obviously there are some intangibles to California and the California lifestyle carries a reputation around the world. But innovation can take place anywhere and there are plenty of great locations with equitable tax regimes and reasonable costs of living. If the economic situation in California continues to spiral out of control and it becomes prohibitively costly to run a business, I can’t help but think that California’s days as the world’s tech hub might just be numbered.