MoneyFlowPractical guide
Fixed vs variable expenses: the difference, with examples
Splitting expenses into fixed and variable is the first thing anyone learns about household money. It is not a textbook classification: it tells you which expenses you can act on this month and which you cannot.
Fixed expenses
These come back at regular intervals for the same, or nearly the same, amount whatever you do during the month.
- Rent or mortgage payment
- Loan and financing instalments
- Insurance (car, home, life)
- Plans and memberships: phone, internet, gym, streaming services
- Building or service charges, school or nursery fees
They are not decided month by month: changing them takes a deliberate choice (switching plan, cancelling, renegotiating), and the effect lasts.
Variable expenses
These change according to what you do and what you choose.
- Groceries
- Cafés, restaurants, takeaway and delivery
- Fuel and occasional transport
- Clothing, online shopping, gifts
- Leisure, travel, free time
Here you have room every day: these are the lines where habits make the difference.
The ones in between
Some items do not fit neatly in either box.
- Electricity and gas bills arrive regularly, but the amount changes with usage and season. They are "semi-fixed": you know they are coming, not how much.
- Annual expenses (vehicle tax, insurance paid in one instalment, taxes) are fixed but land only once, which is why they catch you off guard. Divide them by twelve and count them as if they were monthly.
- Groceries are variable, but part of them cannot be squeezed: below a certain amount you cannot go.
💡 The practical test: if changing the amount means signing, cancelling or calling someone, it is a fixed expense. If behaving differently is enough, it is variable.
Why the distinction is useful
- It tells you what an "empty" month costs. The total of your fixed expenses is what leaves even if you buy nothing. It is the number to know before any other decision.
- It tells you what is really left. Income minus fixed expenses: that is the margin to reason about, not the whole salary.
- It tells you where to look. You rarely touch fixed costs, but each change counts for every month that follows. You adjust variable ones often, in small steps.
It is also the third step in building a monthly budget.
How to find your fixed expenses
Take the last three months of transactions (you can download them from your bank) and mark everything that appears every month for a similar amount. You will find a few you had forgotten: because they are always the same, you stop seeing them.
How MoneyFlow does it
MoneyFlow recognises recurring expenses on its own by looking at your transactions, even when you do not log them on the same day each time: it shows how often they come back, how much they are and whether one has changed compared with previous times. Recurring-expense detection is part of the PRO plan; transactions, categories and budgets are in the free plan.
Find out what your fixed expenses are
MoneyFlow recognises the expenses that come back and shows what is really left each month. Start free, no card.
Try it free →Frequently asked questions
What are a household's fixed expenses?
Rent or mortgage, loan payments, insurance, phone and internet plans, memberships, building charges, school fees: everything that comes back at regular intervals for a similar amount.
Are utility bills fixed or variable?
In between: they arrive regularly, but the amount depends on usage and season. Treat them as fixed for timing and estimate the amount from the average of past months.
How do you calculate monthly fixed expenses?
Add up everything that comes back each month, then add one twelfth of the annual ones, such as vehicle tax and insurance paid in a single instalment.