We recycle disposable plates and cups, we throw out disposable nappies. The whole concept of something being disposable is that you can get rid of it. The same applies to your disposable income, it’s the money you can burn (though obviously not actually burn – that is illegal) or the money left over after your needs have been covered. Not sure how to work out what your disposable income is – it’s easy:
Knowing what your disposable income is can help you make decisions about your spending.