Short answer. Yes. Even if your contract never uses the word 'solidary,' Article 1207 of the Civil Code says solidary liability also exists when the law itself requires it or when the nature of the obligation requires solidarity. So each of you can be liable for the whole even without express words, though the default is otherwise.
What the law says
There is a solidary liability only when the obligation expressly so states, or when the law or the nature of the obligation requires solidarity.
Civil Code, Article 1207 — Joint and Solidary Liability Defined. Read the full provision →
The default is joint liability
When several people owe one obligation, the law's starting assumption favors them. Article 1207 of the Civil Code says the mere fact that two or more debtors share one obligation does not mean that each one of the latter is bound to render, entire compliance with the prestation. In plain terms, if nothing more is said, each debtor is presumed to owe only his own share, not the whole. This is called a joint obligation. A creditor generally cannot force one joint debtor to pay everything and then leave that debtor to chase the others. Solidarity, being the harsher rule, is the exception that must be shown.
The three ways solidarity arises
The article then tells us exactly when the harsher rule applies. It states: There is a solidary liability only when the obligation expressly so states, or when the law or the nature of the obligation requires solidarity. That gives three sources. The first is the parties' own words, an express stipulation of solidarity. But the other two answer your question directly: even with no such words, solidarity exists when the law imposes it, or when the nature of the obligation requires it. So the absence of the word "solidary" in your contract does not settle the matter.
When the law or the nature requires it
Take the two non-contractual sources in turn. Solidarity by law means a specific statute declares certain debtors solidarily liable regardless of what they agreed; scattered provisions of the Civil Code and other laws do this for particular relationships and wrongs. Solidarity by the nature of the obligation means the very character of the undertaking makes divided liability senseless, so that each debtor must answer for the whole. In both cases the source of the solidarity is outside the contract's wording. A person can therefore find himself liable for the entire debt because a law or the essence of the obligation says so, even though he never signed up to that in so many words.
Why the difference matters
The stakes are real. If liability is only joint, a creditor can collect from each debtor only that debtor's proportionate share. If it is solidary, the creditor may demand the full amount from any one debtor, who must pay it all and then seek reimbursement from the others, a real risk if his co-debtors are insolvent or hard to find. That is why it matters whether your obligation falls under one of the three sources of solidarity. Before assuming you owe only your share, check whether a statute or the nature of the obligation quietly makes each of you answerable for the whole.
Cases citing this provision
These Supreme Court decisions cite the provision above. We list them so you can read them yourself; the summaries of what each decided are not ours to give.
- Subic Bay Yacht Club, Inc. vs. Gomeco Metal Corporation, G.R. No. 265921, July 7, 2025 — read the decision on LawPhil →
- AFP Retirement and Separation Benefits System (AFPRSBS) vs. Eduardo Sanvictores, G.R. No. 207586, August 17, 2016 — read the decision on LawPhil →
- Metropolitan Bank and Trust Company, etc. vs. BA Finance Corporation and Malayan Insurance Co, Inc, G.R. No. 179952, December 4, 2009 — read the decision on LawPhil →
- Salvador P. Escano et al. vs. Rafael Ortigas Jr, G.R. No. 151953, June 29, 2007 — read the decision on LawPhil →