It is your residual income that determines how wealthy you are. Some may wonder that when they are still receiving low salary, they lived financially unstable. They cannot buy the things they want and the like.
But when their salary increased, some even doubled, they observed they still live as they were living when they have lesser salary. The culprit here is the residual income. It's your residual income that determines your capacity to live financially stable. No matter how huge is your salary if your residual income is small, then you still live in poverty.
Just be sure that your salary is big enough compared to your expenses and that will guarantee you will have a bigger residual income, and will become financially stable.