Somebody tells you a number. A friend who spent a winter there, a forum post, an index that ranks cities against each other. It sounds manageable, you do a little mental arithmetic against your salary, and the plan starts to feel real.
Then the first month arrives and costs three or four times the figure, and the second month costs less than it. Neither of those is a surprise once you know what the quoted number actually measures. This article is a method rather than a table of amounts: which categories the usual figures leave out, why an aggregated index misleads for a stay of one to six months in particular, and the questions that tell you within ten minutes whether a number someone has given you is worth anything.
Key takeaways
- A monthly figure describes a resident in a steady state. Your first month is not a steady state and never will be.
- Sort every cost by its clock — paid once, paid monthly, or paid on the way out — and never average the three together.
- The categories people forget are the ones with no monthly rhythm: deposits, agency fees, health cover, the visa run, the currency spread, and leaving.
- Work in ratios, not amounts. A ratio survives inflation, exchange rates and the year you happen to read it in.
The Quoted Figure Is Somebody Else's Month
Almost every cost-of-living number in circulation describes a person who already lives there. They signed a lease a while ago, they know which market is cheaper on a Thursday, they have a local bank account, a phone contract, a doctor and a bicycle. Their monthly outgoings are the outgoings of a settled life.
You are buying a different product. For the first weeks you pay a newcomer's premium on almost everything: shorter rental terms, the shop nearest the flat rather than the cheaper one two streets away, taxis while you work out the transport map, restaurant meals while the kitchen has no pans in it. None of that is waste, all of it is real, and none of it appears in the figure you were quoted. The gap is structural, and it is largest for exactly the stay this article is about: long enough to pay every setting-up cost, too short to amortise any of them.
Three Clocks, not One Budget
The single most useful move is also the simplest. Before estimating anything, sort every cost you can think of into three groups by when it is paid, and refuse to average them together.
| Clock | Typical costs | How to treat it |
|---|---|---|
| Once, up front | Deposit, agency fee, visa, furnishing | Divide by months of stay |
| Every month | Rent, food, transport, data | All an index estimates |
| On the way out | Notice, cleaning, shipping | Budget it on day one |
Dividing the first row by the length of the stay is where the method earns its keep. The same setting-up cost is trivial over three years and dominant over three months, so two people can quote wildly different monthly figures for the same city and both be telling the truth. Always ask how long they stayed.
What Lands before You Have Slept a Night
The up-front group is the one people underestimate, because it has no rhythm to remember it by. A reasonable checklist: the security deposit, an agency or finder's fee, the first month of rent in advance and sometimes the last month too, a utility connection, furniture and kitchen basics if the place is bare, a transport card, a health policy, and the permit fee itself.
Unfurnished means different things in different places, and the difference can run to a month of rent in pans, bedding and a lamp. Ask what is in the photographs, and what is only in the photographs.
Where deposits are regulated, they are regulated as a multiple of the rent rather than as a sum of money. Under the Tenant Fees Act 2019 in England, a landlord or agent may take a tenancy deposit of at most five weeks' rent for most tenancies, and a holding deposit of at most one week's. Notice the shape as much as the content: the legislator wrote a ratio, because a ratio still means something after five years of rent rises. Write your own budget the same way.
Warning
A deposit is not a cost, it is a loan you make to your landlord — but it is money you cannot spend, held for the whole stay, and returned late often enough that you should plan for it to arrive after you have already left.
An Aggregated Index Is a Lagging Average
Cross-country indices are useful for a narrower job than the one people give them, and two things about how they are built decide what they can honestly answer.
The crowdsourced ones are exactly that. The largest, Numbeo, describes itself as leveraging crowdsourcing, combined with figures gathered manually from supermarket, taxi and government websites and weighted three times higher than user submissions. Its retention policy is the part worth reading: entries older than twelve months are removed by default, and where fresh data is unavailable it may use data up to eighteen months old if inflation indicators suggest prices have been stable. That is a reasonable design, and it means the headline can be an average of last year's prices. Its main index also excludes rent, which for most newcomers is the largest line in the budget.
The official statistics are the other kind. Eurostat's price level indices are built from purchasing power parities covering more than two thousand goods and services at annual national average prices, and Eurostat itself cautions that they "are not intended to rank countries strictly". An annual national average is a real measurement of a real thing. It is not the price of a one-bedroom flat in the neighbourhood you are considering, in the month you are going.
An index answers "is this country broadly dearer than mine?" It has never claimed to answer "what will my March cost?"
Health Cover Is Two Questions, not One
Health is the category most often reduced to a single line in a spreadsheet, and it is really two questions asked at once.
The first is what the state system where you are going will do for you, and on what basis. Reciprocal arrangements exist and they are narrower than people assume. A UK Global Health Insurance Card, for instance, covers state healthcare that "cannot reasonably wait until you come back to the UK", and the NHS states plainly that it "does not replace travel and medical insurance": it does not cover treatment in a private facility, ski or mountain rescue, or being flown home for medical reasons. Those exclusions are precisely the expensive events.
The second question is what your visa or permit obliges you to buy. Long-stay routes often require proof of insurance at a stated level of cover before the permit is issued, which makes it a fixed cost of the visa rather than an optional extra. Look the requirement up on the issuing authority's own pages, price the policy that satisfies the wording, and put the figure in the up-front column.
The Visa Run Is a Budget Line
If your stay outlasts the visa-free allowance and you have not applied for a permit, you are planning to leave and come back, and that is a cost with several parts. Non-EU nationals visiting the Schengen area are limited to short stays of "up to 90 days in any 180-day period" — a rolling window rather than a per-entry allowance, which is the detail that catches people out.
Count all of it: the transport out and back, the nights away, any entry fee, and the working days lost if your income depends on your hours. Then divide by the months of the stay, because that is what the trip costs per month of living there. Done honestly, a cheap city with a required exit every three months can land above a dearer one that issues a permit for the whole period.
Every Conversion Has a Spread, so Count the Conversions
Money changing hands between currencies is priced, always, and the total depends less on finding a good rate than on how many times you convert. Salary into local currency, local currency back out at the end, a card that converts at every purchase, cash withdrawn in the wrong place: each is a separate spread on a separate amount.
So stop thinking about rates and start counting events. Write down every point in the stay where money crosses a currency boundary, note roughly how much crosses at each, and treat the spread as a share of that total rather than as a fee you might avoid. Our guide to paying abroad without losing money to fees takes the mechanics apart; for budgeting, the shape is that fewer, larger conversions cost less than many small ones.
Note
Build the estimate in one currency and convert once, at the end. Mixing currencies inside a spreadsheet is how a budget quietly acquires a second exchange rate nobody chose.
What It Costs to Leave
The exit column is the one nobody writes down, and it arrives when the money is thinnest. It typically holds a notice period you may have to pay through, an end-of-tenancy cleaning charge, deductions from the deposit that you will not agree with, shipping or excess baggage for everything you accumulated, the cost of closing local accounts, and in some places a formal deregistration step with a fee and a queue attached. None of these is large on its own. Together they routinely add up to more than a month of ordinary living, and they land in the same fortnight.
Do the Arithmetic in Ratios, not Amounts
Here is the habit that makes the exercise durable. Express each cost as a ratio rather than a figure: the deposit as weeks of rent, the agency fee as a fraction of a month, groceries as a share of rent, the whole budget as a multiple of what you spend at home now.
Prices move, currencies move, and so does the year on the article you are reading. A rule like "the up-front cost is roughly three months of rent" stays approximately true long after every amount in the same paragraph has gone stale.
Ratios also make comparison possible at all. Two cities quoted in two currencies with two inflation rates cannot be compared as amounts by anyone reading quickly, but "housing takes about half the budget here and a third there" is a sentence you can act on. And the ratio to your own spending answers the question you are really asking, which is not "is this place cheap?" but "can I afford this place?"
How to Sanity-Check a Figure Someone Quotes You
When somebody hands you a monthly number, five questions tell you what it is worth. Ask them in this order; the first two usually settle it.
-
How long did you stay?
Under a year, and the up-front costs still weigh on their average. Over three years, they have vanished from it entirely.
-
What is in it, and what is not?
Rent, health cover, visa costs and flights are the four most commonly left out. A figure missing all four can be less than half the real one.
-
Who paid for the things that were not money?
A partner's lease, an employer's relocation package, a friend's spare room, furniture inherited from the last tenant. Any of these makes a number unrepeatable.
-
When was it true?
Ask for the year. Rents and utilities can move faster than a traveller's memory of them.
-
Which neighbourhood, and how did they get to work?
The cheaper district plus a daily commute is a different budget from the dearer one on foot, and an average hides the trade entirely.
Two independent answers that agree are worth more than one confident one. Where you can find only a single source, treat its number as the optimistic end of a range.
Common Questions
Are Cost-of-Living Indices Worth Using at All?
Yes, for the job they do well: sorting candidate countries into broad bands before you look closely. They are poor at absolute amounts and poor at short stays. Use one to shorten a list, never to set a budget.
How Much Should I Add for Being New?
Rather than adding a percentage, list the things that are temporary — eating out until the kitchen works, taxis until the transport makes sense, the shorter and dearer rental term — and price those. A named list is easier to reduce in month two than a vague contingency.
Should I Budget in My Own Currency or the Local One?
Estimate in the local currency, because that is what the prices are in, then convert once to compare with what you earn. Keeping two live currencies in one spreadsheet is how errors hide.
Does a Short Stay Change Which Costs Matter Most?
Completely. Over a year, rent dominates and the rest is detail. Over two months, the up-front and exit columns can outweigh the rent entirely, and a place with a simpler set-up beats a cheaper one.
Build Your Own Number
The sequence is short. Sort every cost into the three clocks. Fill the monthly column from an index or two and treat it as a range rather than a figure. Fill the up-front and exit columns yourself, from the specifics of the place and the permit, because no index will do it for you. Divide the up-front total by the months you will stay, add the three, and express the result as a ratio to what you spend now.
Then settle the line that is easier to fix before you go than at the airport: how you will be online the moment you land, since half of the checks above are done from a phone in the first week.
Check what data costs where you are going Live plans and coverage for the country you are moving to, so one line of the budget is settled before you land.
