Short answer. Yes. Under the Family Code, any amount advanced by the conjugal partnership on installment property that belongs exclusively to one spouse must be reimbursed by the owner — but the reimbursement falls due upon liquidation of the partnership, not the moment the advance is made or the ownership is settled.
What the law says
any amount advanced by the partnership or by either or both spouses shall be reimbursed by the owner or owners upon liquidation of the partnership
Family Code, Article 118 — Property Bought on Installments. Read the full provision →
Why the property is yours in the first place
Article 118 answers two questions at once: who owns installment property paid from mixed funds, and who owes whom afterwards. On ownership, the test is timing — property bought on installments belongs to the buyer or buyers if full ownership was vested before the marriage and to the conjugal partnership if such ownership was vested during the marriage. So if ownership vested in you before you married — typically because the contract transferred it to you then, even though installments kept falling due — the property is exclusively yours, no matter that conjugal money later serviced the balance.
The money and the title travel separately
The article's second sentence is the part your question turns on: in either case, any amount advanced by the partnership or by either or both spouses shall be reimbursed by the owner or owners upon liquidation of the partnership. Ownership does not swallow the advances. The property stays exclusive, but the partnership acquires a money claim against you for what it paid — and the rule cuts symmetrically: had the property been conjugal, a spouse whose exclusive funds paid installments would be the one reimbursed. Whoever ends up owner pays back whoever advanced.
Reimbursement waits for liquidation
Note when the obligation matures: upon liquidation of the partnership. Liquidation happens when the conjugal partnership ends and its assets and accounts are settled — not while the marriage is running normally. Nobody sends a demand letter mid-marriage for installments the partnership advanced; the advance sits as an accounting item until the settling of accounts, where it is charged against the owner-spouse's share. This is why the question usually surfaces during annulment, separation of property, or estate settlement — the moments when the partnership's books are finally balanced.
Protect the paper trail now
By the time liquidation arrives, the payments may be decades old, so the practical task is documentary. Keep — or start reconstructing — the contract to sell or deed showing when ownership vested, the schedule of installments, and proof of which funds paid which amortisations: receipts, bank records, payslips matching the periods. The distinction between exclusive and conjugal funds is exactly the kind of fact that becomes contestable when memories and marriages have both broken down. A lawyer valuing your position in a liquidation will ask for precisely these documents, because the reimbursement is only as strong as the proof of the advances.