G.R. No. L-68118 October 29, 1985
JOSE P. OBILLOS, JR., SARAH P. OBILLOS, ROMEO P. OBILLOS and REMEDIOS P. OBILLOS, petitioners, vs. COMMISSIONER OF INTERNAL REVENUE and COURT OF TAX APPEALS, respondents.

FACTS

Petitioners, four siblings, acquired two parcels of land from their father in March 1973. Their original intention was to build their residences on these lots. In 1974, after holding the properties for over a year, they resold the lots and realized a total profit of P134,341.88. They treated this profit as a capital gain, paying individual income tax on one-half of their respective shares.
In April 1980, the Commissioner of Internal Revenue assessed deficiency taxes against the petitioners. The Commissioner theorized that by jointly purchasing and later selling the properties, the siblings had formed an unregistered taxable partnership or joint venture. Consequently, he assessed them for corporate income tax on the total profit, plus fraud surcharges and interest, and also treated their individual shares as ordinary income taxable in full, not as capital gains. This resulted in a total assessment of P127,781.76 on a profit of P134,336, in addition to the capital gains tax already paid.

ISSUE

Whether the co-ownership of the petitioners over the two lots, and their subsequent single act of selling the same, constituted an unregistered partnership subject to corporate income tax under the National Internal Revenue Code.

RULING

The Supreme Court ruled in favor of the petitioners and reversed the Court of Tax Appeals. The legal logic centers on the fundamental distinction between a co-ownership and a partnership. A partnership, under Article 1767 of the Civil Code, requires a mutual agreement to contribute money, property, or industry to a common fund with the intention of dividing the profits among themselves. The sharing of returns from property, by itself, does not establish a partnership.
The Court found no evidence of an unmistakable intention to form a partnership. The petitioners were mere co-owners who acquired the property for a specific, non-commercial purpose—to build their homes. The subsequent sale was an isolated transaction necessitated by the impracticality of their original plan, and the division of proceeds was merely incidental to the dissolution of the co-ownership. This temporary state of co-ownership, aimed at holding and later liquidating the property, is distinct from engaging in a joint venture for profit.
The Court distinguished this case from precedents where parties used common funds to engage in business or repeatedly derive income, which were correctly taxed as unregistered partnerships. To treat this single, liquidating transaction as a partnership would obliterate the legal distinction between co-ownership and partnership and lead to oppressive taxation. The assessments were therefore cancelled.