Short answer. Generally no. Even where the owner genuinely owes you for expenses, you cannot hold the borrowed item hostage until he pays. There is one narrow exception: you may hold on to it for damages you suffered because the owner knew of a flaw in the thing and never warned you.
What the law says
The bailee cannot retain the thing loaned on the ground that the bailor owes him something, even though it may be by reason of expenses. However, the bailee has a right of retention for damages mentioned in article 1951.
Civil Code, Article 1944 — No Retention Except for Damages. Read the full provision →
What the law says
The bailor who, knowing the flaws of the thing loaned, does not advise the bailee of the same, shall be liable to the latter for the damages which he may suffer by reason thereof.
Civil Code, Article 1951 — The Lender's Liability for Known Flaws. Read the full provision →
Why money owed does not buy you a lien
In a free loan of a thing, ownership never moves. You were given the use of someone else's property as a favour, and the duty to hand it back is not a bargaining chip. The Code says this in the plainest terms it has: you cannot retain the thing on the ground that the owner owes you something, even though it may be by reason of expenses. That last clause is there because expenses are the argument borrowers actually reach for. Repairs, servicing, fuel, a new part fitted while the item was in your hands — none of it converts into a right to keep the item until you are reimbursed.
The one exception, and how narrow it is
You may hold on to the thing for damages of one specific kind: those covered by Art. 1951, where the owner knew of a flaw in the item, said nothing, and you were hurt or suffered loss because of it. A lent chainsaw with a defect the owner had already noticed is the classic picture. Notice what the exception requires — actual knowledge on the owner's side, silence, and damage traceable to that flaw. It is not a general right to withhold the thing over any injury. If the owner did not know of the defect, or told you about it, the exception does not open.
Which expenses were ever the owner's to begin with
Before arguing about retention, check whether you are owed anything at all. The ordinary expenses of using and keeping the thing while you have it are yours to bear — that is the price of borrowing something for nothing. What the owner may answer for are the extraordinary ones: unforeseen expenditure needed to preserve the thing itself, as opposed to the cost of running it. A borrower who fuels and services a lent vehicle is spending his own money by design. A borrower who pays for structural repair the thing needed regardless of who was using it stands on very different ground.
What to do instead of holding it
Return the thing and pursue the money separately. Refusing to return is itself a breach, and a borrower in breach can find himself answering for loss or damage that happens afterwards, even from accidents he did not cause. That is a real risk: the item is in your hands, and things go wrong. Send a written demand setting out each expense with receipts, keep the photographs that show the condition of the thing before and after, and be precise about which costs were unforeseen and necessary to preserve it. A documented claim is worth far more than possession you were never entitled to keep.
Related provisions
- Civil Code, Article 1944 — No Retention Except for Damages
- Civil Code, Article 1951 — The Lender's Liability for Known Flaws