I don't follow your logic. The top CA rate is 9.3% and the top IRS rate is 35%, so even if OP worked 24/7 and never slept at 6,680 hours a year OT... OP will still would have a net positive income from the OT yes? Am I missing something here?
No matter how high the tax brackets or at what income level, as soon as you earn a single penny more, you have more net income in your pocket. Higher tax brackets are only applied to dollars over the tax bracket itself, not retroactively to money you've made in a lower tax bracket.
So with a progressive tax system, keeping it simple, let's say you have 3 brackets, 10%, 20% and 30% and the salaries where you go to the higher bracket are 10,000$, 20,000$ and 30,000$.
Your first 10,000$ is tax free. Your 2nd 10,000$ is taxed at 10%. So if you make 20,001$, you pay :
0-10,000$ : 0% 0$
10,000$ - 20,000$ : 10% 1000$
20,000$ - 20,001$ : 20% 0,20$
1000,20$ dollars. You've thus made 19,000.80$ net income. Now let's say someone makes 19,999$ :
0-10,000$ : 0% 0$
10,000$ - 19,999$ : 10% 999.99$
He's made 18,999.01$.
Easy enough (not singling you out WeaselBoy, I know this is what you were also getting at) ? No matter how much little money you make over a bracket, going over brackets does not result in lower net income.