Furthermore, you can increase your equity through income, and decrease equity through expenses. This makes sense of course, when you receive a paycheck you become “richer” and when you pay for dinner you become “poorer”. This is expressed mathematically in what is known as the Accounting Equation:
Assets - Liabilities = Equity + (Income - Expenses)
This equation must always be balanced, a condition that can only be satisfied if you enter values to multiple accounts. For example: if you receive money in the form of income you must see an equal increase in your assets. As another example, you could have an increase in assets if you have a parallel increase in liabilities.
The basic accounts relationships