Property Finance

How much cash should remain after buying in Luxembourg

The riskiest position in this market is not a large mortgage. It is completion with nothing left, in a building whose general assembly can vote a call for funds you did not choose and cannot refuse.

Why the buffer is structural here rather than prudent

An apartment in Luxembourg is a lot inside a copropriété governed by the amended law of 16 May 1975. Decisions taken by the general assembly bind every owner, and the syndic is obliged to pursue recovery of unpaid amounts on its own initiative, without needing the assembly's authorisation.

So a call for funds is not a bill you can defer while you rebuild savings. It is an obligation attaching to your lot, allocated by your millièmes, on a timetable other people set. That is the specific risk the buffer exists for, and it does not exist in the same form for a house.

The four demands on your cash at completion

• The deposit, set by your loan-to-value ceiling. Under CSSF Regulation 20-08 of 3 December 2020 the general principle is 80%, with first-time buyers of a principal residence able to reach 100% of the price, other principal-residence purchases generally at 90%, and buy-to-let at 80%.
• Acquisition costs, which are normally excluded from financing. Duties of 7%, being 6% registration and 1% transcription, less the Bëllegen Akt at €40,000 per buyer and €80,000 for a couple acquiring together, permanent since July 2025, with a minimum €100 always payable. Then regulated notary emoluments of roughly 1% to 1.5% plus VAT, disbursements and the mortgage deed.
• Works, whether financed or not, since staged drawdowns follow progress.
• The buffer, which is what remains.

A 100% loan-to-value does not mean no cash is required. It refers to the price, not to the cost of acquiring.

Sizing it against the building, not against a rule

Generic advice suggests a number of months of expenses. In a Luxembourg co-ownership the more useful method is to size the buffer against the building's documented liabilities.

Three inputs. The balance and annual contribution of the fonds de travaux, compulsory since 1 August 2023 under the law of 30 June 2022, with a minimum fixed by grand-ducal regulation per square metre of energy reference surface and graded by the building's thermal insulation class. The minutes of the last three general assemblies, where works voted and not yet called for are an existing liability rather than a risk. And the age of the major elements: roof, facade, lift and heating plant, with facade renovation typically arising every fifteen to twenty years.

A new build with a young fund and distant liabilities justifies a modest buffer. An older building with a thin fund and a facade approaching renewal justifies a substantial one, and the difference between the two is not a matter of temperament.

The second claim: the property itself

Alongside the building sits your own lot. Ask the seller for four dates and the documents behind them: when the electrical installation, the plumbing, the heating and the windows were last replaced.

Where those are documented and recent, the interior risk is low. Where nobody can answer, the answer is unfavourable by default and the buffer should reflect it, because services in an older property are the category whose scope is discovered rather than specified.

What the buffer should not be spent on

It is not the renovation budget, and holding one figure for both is how owners find themselves negotiating with a bank while a property is open. Keep them as separate lines with separate purposes.

It is also not a substitute for the acquisition costs. Those are known, quantifiable and due on the day, and treating a buffer as their source simply means completing with no buffer.

Where the buffer interacts with the lending decision

Lenders assess remaining disposable income alongside the debt-service ratio commonly cited around 40%, which is banking practice rather than a legal rule, and apply a stress test so the loan is sized against a rate materially higher than the one offered.

A file that leaves a visible reserve after completion is a stronger file, not merely a safer one. Where the property is classed F to H on its energy passport, expect stricter analysis with the necessary works integrated into the financing plan, which makes the distinction between works money and reserve money something the bank will look at rather than something only you know.

Three questions we are asked

Can I count an available credit facility as the buffer? It is better than nothing and it is not equivalent. A facility can be reduced or withdrawn, and it is typically at a higher rate than anything secured on the property.

Should I reduce the deposit to keep more cash? Sometimes, and it depends on the rate and on your loan-to-value ceiling. Where the alternative is completing with nothing in reserve in an older building, a slightly larger mortgage is frequently the better risk.

How long should I hold it for? Until you have been through one full charges reconciliation and one general assembly, which is when the building's real cost and its immediate intentions both become visible.

A worked example

Take a €700,000 apartment in an older building, bought by a couple who are both first-time buyers with their full allowances intact, financed at 100% of the price.

Duties of €49,000 are entirely absorbed by the combined €80,000 Bëllegen Akt, leaving the statutory €100 minimum and €31,000 of credit still available for a future principal residence. What remains payable in cash is the notary's regulated emoluments with VAT, the disbursements and the mortgage deed, which on a purchase of that size is a substantial four-figure sum rather than a rounding item.

Now add the two claims that follow completion. The building is thirty years old, the works fund holds little, and the last assembly discussed a facade study. That is a foreseeable call for funds, allocated by millièmes, on a timetable the assembly sets. Separately, the seller cannot say when the electrical installation was last replaced.

A couple completing that purchase with nothing left is not merely uncomfortable. They are exposed to two obligations, one of which they cannot refuse and neither of which they control.

Rebuilding it after completion

Where the buffer has been partly consumed, rebuild it before doing anything cosmetic. The first twelve months bring the information that matters: one full charges reconciliation, which shows what the building actually costs rather than what the provision suggested, and one general assembly, which shows what the owners intend.

Decorating before both have happened is spending against an unknown. Waiting costs nothing except a year of living with someone else's paint.

Three questions we are asked

Does the buffer change what I should offer? It should. A building with documented liabilities and a thin works fund justifies either a lower offer or a larger reserve, and treating those as alternatives rather than as separate lines is how buyers end up with neither.

Is it different for a house? The obligation is, the need is not. There is no assembly able to vote a call for funds, and equally no compulsory works fund forcing you to provision for a roof. The discipline has to be voluntary.

What is the most common mistake? Treating a 100% loan-to-value as meaning no cash is required. It refers to the price, and the acquisition costs, the works and the reserve are three further requirements on top.