Specifically regarding no tax on overtime, the law makes the 50% overtime pay exempt from tax on hours over 40 per week, but your base pay is still taxable. As a simple example, suppose your base pay is $20 per hour and you work 45 hours. You will be paid 40 hours at $20 per hour and 5 hours at $30 per hour ($20 plus $10 for overtime). It is the 5 hours x $10 that will be tax-free. Your base pay (45 hours x $20/hour) is still taxable.
