Before you can manage your money, you need a clear picture of what’s coming in. This is your income. For most people, the biggest source of income is a salary from a job. But money can flow in from other places, too.

Think about all the ways you earn money over a month or a year. This could include:

• Salary or Wages: The regular paycheck from your main job.
• Bonuses: Extra pay you might receive for good performance.
• Side Gigs: Money earned from freelance work, a part-time job, or selling things online.
• Investment Returns: Earnings from stocks or other investments.
• Other Sources: This might be anything from a birthday check to child support payments.

Just as important as what comes in is what goes out. These outflows are your expenses. They cover everything you spend money on, from your home to your morning coffee. To make sense of them, it helps to split them into two main categories: fixed and variable.

Fixed expenses are the predictable costs in your life. You know when they’re due and roughly how much they’ll be. These are often necessities that form the foundation of your financial life.

Common examples include:

• Rent or mortgage payments
• Car payments
• Insurance premiums (car, health, renters)
• Student loan payments
• Monthly subscriptions (like streaming services or gym memberships)

Variable expenses are where your daily choices have the biggest impact. These costs fluctuate. One month you might spend a lot on groceries for a party, and the next month you might spend very little. These are often the easiest areas to make adjustments if you need to.

Examples include:

• Groceries
• Gas for your car
• Dining out
• Entertainment (movies, concerts, etc.)
• Shopping for clothes or household items

Once you can identify your income and categorize your expenses, the next step is to see where your money is actually going. This isn’t about judging your spending; it’s simply about understanding it. The goal is to get a realistic view of your financial habits.

The easiest way to do this is to look at your bank and credit card statements from the last month or two. Go through them line by line and categorize each transaction as a fixed or variable expense. This exercise shows you the real data behind your spending, not just what you think you spend.

Looking at a statement, you might see a payroll deposit (income), a rent check clearing (fixed expense), and several small charges for coffee or lunch (variable expenses). Sometimes the small, frequent purchases are the most surprising. You may not realize how much they add up until you see them all listed together.

Let's check your understanding of these core concepts.

Understanding the difference between income, fixed expenses, and variable expenses gives you a powerful lens through which to view your financial life. With this clarity, you can begin to make more informed decisions.