If you're self_employed, your after_tax income equals your gross income less your business expenses, such as the cost of your laptop or airfare to conferences, as well as the amount you set aside for taxes. You're responsible for remitting your own quarterly estimated tax payments to the government because you don't have an employer to take care of it for you.
Step 2: Track your spending. It’s helpful to keep track of and categorize your spending so you know where you can make adjustments. Doing so will help you identify what you are spending the most money on and where it might be easiest to cut back. Begin by listing all your fixed expenses. These are regular monthly bills such as rent or mortgage, utilities or car payments. It’s unlikely you’ll be able to cut back on these, but knowing how much of your monthly income they take up can be helpful.