A Quick Classification Method for Separating Fixed and Variable Expenses
What Becomes Clear When You Split Spending in Two
Budgeting feels overwhelming because there are too many categories. Start by dividing all spending into just two piles: “fixed expenses that are almost the same every month” and “variable expenses that depend on how you spend.” Even this simple step separates “money I can adjust” from “money that is hard to touch.”
| Section | Key summary |
|---|---|
| What Becomes Clear When You Split Spending in Two | Budgeting feels overwhelming because there are too many categories |
| When You Are Not Sure Where Something Belongs | For confusing items, ask, “Could I reduce this if I tried this month?” |
| Make a Table in 4 Classification Steps | Gather the past month’s card and account transactions on one screen |
| Example Household at a Glance | Short key point |
| Money to Cut and Money to Review Are Different | Fixed expenses repeat every month, so reducing them once has a lasting effect |
When You Are Not Sure Where Something Belongs
- Fixed expenses: spending that stays almost the same every month, such as rent and maintenance fees, phone bills, insurance premiums, subscriptions, and loan repayments
- Variable expenses: spending that changes depending on how much you use, such as groceries and dining out, daily necessities, transportation, clothing, hobbies, and family or social events
- For confusing items, decide by asking, “Could I reduce this if I tried this month?” If it is hard to reduce, treat it as fixed; if it is possible, treat it as variable
Make a Table in 4 Classification Steps
- Gather the past month’s card and account transactions on one screen.
- Mark only one letter next to each item: “F” for fixed or “V” for variable.
- Add up the F total and the V total separately. Example: out of monthly take-home pay of 3 million won, F is 1.65 million won and V is 950,000 won.
- Check the remaining money (300-165-95=400,000 won), then write down next month’s V target again after lowering it by 5~10%.
Example Household at a Glance
| Category | Item | Monthly amount | Room to reduce |
|---|---|---|---|
| Fixed expenses | Rent and maintenance fees | 750,000 won | Low |
| Fixed expenses | Phone, insurance, subscriptions | 230,000 won | Low (check once) |
| Fixed expenses | Loan repayment | 670,000 won | Low |
| Variable expenses | Groceries and dining out | 550,000 won | High |
| Variable expenses | Transportation and daily necessities | 260,000 won | Medium |
| Variable expenses | Hobbies and other | 140,000 won | High |
The table shows that the 1.65 million won in fixed expenses will not go down without a major decision, while the 950,000 won in variable expenses can be adjusted immediately through this month’s choices. For example, reducing variable expenses by just 10% moves 95,000 won into savings every month.
You do not need to review fixed expenses every month; checking them once a quarter is enough. Even canceling one unused subscription, such as 12,000 won per month, saves 140,000 won a year.
Money to Cut and Money to Review Are Different
Fixed expenses repeat every month, so reducing them once has a lasting effect. But many, such as rent or insurance, are difficult to change immediately. Variable expenses, on the other hand, can be adjusted right away through this month’s behavior. When you mix the two, it becomes unclear what to do first.
At first, focus on the nature of the expense rather than the exact category name. If it goes out automatically every month, it is a fixed expense. If it changes each time you make a choice, it is a variable expense. For confusing items, it is easier to decide by asking, “Could I reduce this if I made up my mind this month?”