French Phrase
À quoi sert la caution ?
Meaning
The sentence asks about the purpose of a security deposit. It is typically heard when someone is signing a lease, borrowing equipment, or entering any agreement that requires a financial guarantee.
When to use
Use this question when you want to know why a deposit is being requested – for example, during a conversation with a landlord, a bank officer, or a friend who is renting out an apartment.
✦Grammar Breakdown
Àquoisertlacaution?
À quoi
The interrogative phrase ‘à quoi’ means ‘what for’ or ‘for what purpose’; it is used with verbs to ask about the function of something.
sert (servir)
‘sert’ is the third‑person singular present of the verb ‘servir’ (to be used for, to serve).
la caution
In the context of rentals, ‘caution’ is a feminine noun meaning a security deposit; it is preceded by the definite article ‘la’.
Question mark
In written French, the question mark follows the whole sentence without a space before it.
🗨In Conversation
À quoi sert la caution ?
What is the deposit for?
Elle sert à couvrir d'éventuels dégâts ou impayés.
It is to cover possible damages or unpaid rent.
✕Common Mistakes
Pour quoi sert la caution ?
‘Pour quoi’ is not used to ask about purpose; the correct form is ‘à quoi’.
À quoi cautionner la caution ?
‘Cautionner’ means ‘to guarantee’ a person, not the deposit itself.
À quoi serait la caution ?
Use the present ‘sert’ for a factual question; ‘serait’ would make it conditional and sound odd here.
↔Alternatives
Pourquoi la caution ?
Why the deposit?
Quel est le but de la caution ?
What is the purpose of the deposit?
À quoi ça sert, la caution ?
What does the deposit do, exactly?
Cultural Tip
In France, a ‘caution’ for a rental is usually equal to one month’s rent and is returned at the end of the lease if the property is left undamaged. Asking ‘À quoi sert la caution ?’ shows you’re aware of the practice and want to be sure you’ll get your money back.