Short answer. Usually no. Article 1771 says a partnership may be constituted in any form, so an oral or even an implied arrangement can create one. The exception is real property: where immovable property or real rights are contributed, a public instrument is necessary and further formalities follow.

What the law says

A partnership may be constituted in any form, except where immovable property or real rights are contributed thereto, in which case a public instrument shall be necessary.

Civil Code, Article 1771 — Form of a Partnership. Read the full provision →

You may already be in one

A partnership may be constituted in any form, subject to the exception the same article states. Read alongside Article 1767, which has two or more persons bind themselves to contribute money, property or industry to a common fund with the intention of dividing the profits among themselves, the practical effect is that a partnership can exist without anyone signing anything. If you and a friend each put in capital or effort and agreed to split the profits, the law may already treat you as partners whatever you called the arrangement. That cuts both ways: the duties come with the status.

Land is the real exception

Where immovable property or real rights are contributed, Article 1771 requires a public instrument, and Article 1773 goes further with a sanction people underestimate. A contract of partnership is void whenever immovable property is contributed to it if an inventory of that property is not made, signed by the parties, and attached to the public instrument. Not unenforceable, not defective: void. So if the land your business stands on was contributed as capital, the inventory is not a filing formality. It is a condition of the partnership existing at all.

Registration is a separate question from validity

Article 1772 requires every contract of partnership having a capital of three thousand pesos or more, in money or property, to appear in a public instrument recorded in the Office of the Securities and Exchange Commission. The article then answers the question everyone asks next: failure to comply shall not affect the liability of the partnership and the members thereof to third persons. An unregistered partnership is therefore not a shield. Suppliers and customers may still hold the partnership and the partners to what was promised, so non-registration removes benefits without removing exposure.

Why to write it down anyway

Validity is the low bar. The document earns its cost by settling what the Code otherwise fills in by default: how profits and losses are shared, who manages and what needs consent, whether there is a fixed term, and how a partner leaves and is bought out. Article 1784 has the partnership begin from the moment of execution of the contract unless otherwise stipulated, which is itself worth stating clearly. If you are already operating on a handshake, reducing the existing understanding to writing now is easier than reconstructing it during a dispute.

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.

Related provisions

Note. Statute text quoted on this page is reproduced from the official enactment and is linked to the full provision. The explanation around it is general legal information from Vivas & Nobles Law Office, not legal advice. Whether it applies to your situation depends on facts only a lawyer reviewing them can assess.