An expense can be anything that you spend your money on, from rent, monthly bills (electricity, water, internet etc), to transport around the city or a coffee. The majority of the expenses normally are planned, you know them in advance, but there are also some that come unexpected for example a visit to the doctor when you get a cough, or a parking fee.
It is important to divide these expenses into two categories:
a)fixed
These are expenses that are necessary to spend every month (such as rent, bills, food) and
b) variable
These are expenses that are not necessary and may vary month to month (such as eating out, medical expenses).
