[grandsham]

I don't think you understand how tax brackets/tax zones work.

For example, say there is no tax up to $50000, and a 50% bracket starts at $50000. If you make $50001, you only pay a 50% tax on that one dollar over 50k, the first 50k remains untaxed. This is how pretty much any tax regime in the world works.

So while you may have to pay a higher tax rate on extra overtime money earned, it would be just on that money, not on your base pay. It's impossible for you to make less money at the end of the year because you worked overtime.