Then, figure out your after-tax payroll deductions
From here, you'll need to tally up the rest of your deductions, including (but not limited to):
- Your after-tax retirement contributions (usually a percentage of your monthly salary)
- Benefits (health/dental/vision insurance, life insurance, etc.)
- Union dues
- Any wage garnishments
Remember to figure all of these amounts on a monthly basis. Many health insurance premiums are quoted on a monthly basis, but it's worth double-checking the amounts, and converting them to monthly figures if needed. For example, if you're a teacher and pay union dues of $20 from each semi-monthly paycheck, be sure to use $40 when adding up your deductions.
Finally, subtract your taxes and deductions from your gross pay
The final step is to take your salary, divide it by 12, and then subtract all of your taxes and payroll deductions. The result of this calculation will be your monthly take-home pay.
If this calculation seems rather complicated, the IRS has an online payroll calculator that can do the math for you so you'll know where the number on your paycheck is coming from.
An example
To illustrate this, let's consider an example. Let's say that you just got a new job with a starting salary of $60,000. For this calculation, we'll assume you are single, and claim just one exemption. You have agreed to contribute 5% of your salary to your new employer's 401(k) on a pre-tax basis. So your taxable income is: