While net worth gives you a picture of your assets and liabilities, it is even more important to know how much money comes in and goes out every month. This will give you a good idea of what you spend money on every month, and having all these expenses written down can tell you exactly where savings can be found. This is the centerpiece of any financial plan Make a list of your monthly sources of income (salary, child support, etc.). Add these sources together to find your total monthly income. It can be helpful to organize these into groups. For example, under “Housing,” you could include your rent or mortgage payments, home or renter’s insurance, and utilities; under “Transportation,” you could include car payments, fuel costs, maintenance charges, and car insurance. Add all of your expenses together to find your monthly total. Make sure to include expenses like entertainment, food, clothing, credit card payments, taxes, and other incidental costs. Remember that some expenses are “fixed” (the same or nearly the same each month) while others are variable (change frequently, or are irregular). When making a budget, try to account for variable expenses, including those that don’t occur monthly. You can make a list of variable expenses that occur over a period of several months, add them together, and then divide that sum by the number of months. This will leave you with an average variable expense number that you can factor into your monthly budget. If your income is more than your expenses, you will have a remainder that you can save, invest, or spend according to your financial goals. If your expenses are more than your income, then review your budget for expenses that you can reduce or cut.  If you don’t yet know the exact amount of your income and/or expenses, keep track of them for a few months to get an idea. Review and update your budget frequently. Make sure to add any new expenses, and remove any that you no longer have.

How would you rephrase that briefly using Vietnamese?
Quyết định lập kế hoạch tài chính. Xác định các nguồn thu nhập. Xác định các chi phí hàng tháng. Tính toán các chi phí không thường xuyên và chi phí khả biến. Lấy tổng thu nhập trừ đi tổng chi phí.