In the US advertised salaries don't include personal income tax (local and federal), insurance, social security, medicare, 401k, and any other fees you might incur.

At the top of your paycheck you would see your 'advertised' earnings for that period and then at the bottom you have your take home net pay. Depending on your location, you loose around 20% of your 'advertised' pay to taxes and other mandatory things. If you contribute to a 401K you loose even more.