California marginal income tax rates for a single person on $300k are less than 10%. On the other hand, federal rates are higher than 20%. You don't pay 10% s

California marginal income tax rates for a single person on $300k are less than 10%. On the other hand, federal rates are higher than 20%. You don't pay 10% sales tax unless you're using your entire income (uh, including the stuff that was taxed away?) on items that the sales tax applies to (and you certainly aren't). If you're a single person in California, at $300k, if you have no special tax situation, you'll pay a bit less than 40% tax. If you're married, significantly less than that.