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.
If you can't forgo a payment such as a minimum payment on a credit card, it can be considered a "need," according to the Warren and Tyagi. Why? Because your credit score will be negatively impacted if you don't pay the minimum. By the same token, if the minimum payment required is ษ and you regularly pay 贄 a month to keep a manageable balance, that additional ๛ isn't a need.