Here's why you won't really pay 'extra' tax on your second job
What tax rate will you pay if you take a second job?
The good news is that you don’t pay a higher rate of tax just because a job is your second job.
Your tax bill is calculated based on your total income. Annual income up to $14,000 is taxed at 10.5%. Anything you earn that is over $14,000 a year and less than $48,000, is taxed at 17.5%. Annual income between $48,000 and $70,000 is taxed at 30%. Between $70,000 and $180,000 is taxed at 33% and anything earned over $180,000 in a year is taxed at 39%.
Source: Stuff