Fixed vs variable expenses: definitions and examples
Updated October 7, 2026 · By the Souski team
Fixed expenses and variable expenses: this simple split is the key to any budget. The first come round every month no matter what; the second depend on your choices. Separating them tells you how much you really have to live on, and where to look for savings. Definitions, examples and method.
Fixed expenses: the costs that come round every month
A fixed expense comes back every month, for the same or nearly the same amount, and you can't stop it overnight. It's often paid by direct debit.
- Rent or mortgage, and service charges
- Electricity, gas and water (when paid monthly)
- Insurance: home, car, health
- Phone and broadband
- Transport pass
- Subscriptions: streaming, gym, news, apps
- Loan repayments (car, personal loans)
- Childcare, school meals, maintenance payments
Variable expenses: the costs you decide
A variable expense changes from month to month depending on your choices and lifestyle. That's where most day-to-day money management happens.
- Groceries
- Fuel and one-off journeys
- Eating out, takeaways, going out
- Clothes, shopping, hobbies
- Gifts, haircuts, personal care
The special case: yearly costs
Some costs only come once or twice a year: tax bills, an insurance premium paid in one go, a car service, end-of-year presents, back-to-school costs. They're what make certain months blow up. The fix: spread them yourself by setting aside 1/12 of their amount each month.
Example: Paul's budget
Paul takes home €2,000 a month. Here are his fixed costs:
| Fixed cost | Per month |
|---|---|
| Rent and charges | €700 |
| Energy | €90 |
| Insurance | €60 |
| Transport | €75 |
| Phone and broadband | €45 |
| Subscriptions | €30 |
| Car loan | €150 |
| Yearly costs spread monthly (car service, holiday presents: €540 ÷ 12) | €45 |
| Total | €1,195 |
Paul has €805 left for variable spending and savings: that's his disposable income. His fixed costs are about 60% of his income, which leaves him little margin. For him, the priority is cutting fixed costs rather than going without day to day.
How to reduce each type of expense
Fixed expenses: one decision, savings every month
A fixed cost is cut once and for all: renegotiate insurance, switch phone plans, cancel a subscription, compare energy suppliers. The effort is one-off; the saving comes back every month with no willpower needed. Our guide on how to cut your subscriptions is a good place to start.
Variable expenses: a budget and some tracking
Variable costs are kept in check with a budget per category and regular tracking. Envelope budgeting is the simplest: one amount per category, and when the envelope is empty, you wait until next month. For groceries, see also how to save on groceries.
Fixed and variable expenses in Souski
In Souski, your fixed costs become recurring transactions: rent, subscriptions or loan repayments are added automatically every month. You then set a budget for each variable category, and the dashboard always shows what you can still spend before the end of the month. For the full method, read how to make a monthly budget.
Your budget ready in 3 minutes, your spending logged in 5 seconds. Free, no bank connection.
Frequently asked questions
Are groceries a fixed or variable expense?
Variable: you need them every month, but the amount depends on your choices (shop, products, quantities). They're also one of the easiest variable expenses to cut.
What share of income should go on fixed expenses?
There's no official threshold, but the higher your fixed costs, the less room you have for surprises and savings. The 50/30/20 rule suggests keeping needs, including fixed costs, around 50% of income. Above that, your budget becomes fragile at the slightest surprise.
Is a loan a fixed expense?
Yes: its repayment comes round every month for the same amount until the loan ends. It's often one of the heaviest fixed costs, which is why it's worth knowing your payoff date and, where possible, repaying the most expensive loans first.
How do I handle yearly costs like insurance or tax?
Divide the amount by 12 and set that sum aside every month. When the bill arrives, the money is already there, and it no longer blows up that month's budget.
This guide gives general pointers and isn't personalised financial advice.