Co-Owning a Home with Unmarried Partners or Siblings: How Fractional Homestead Exemptions Work

As home prices and mortgage interest rates remain elevated, co-buying real estate has become a popular path to homeownership. Unmarried domestic partners, siblings, parents co-purchasing with adult children, and groups of friends are routinely pooling their financial resources to acquire residential property.

However, when co-owners are not legally married, property tax rules diverge sharply from standard married-couple homestead procedures. State tax statutes dictate that an unmarried co-owner can generally claim a homestead exemption only in proportion to their legal ownership percentage in the property deed.

Tenancy in Common vs. Joint Tenancy: Title Determines Tax Relief

How title is held on the deed controls how the county appraisal office calculates exemption amounts:

• Tenancy in Common (TIC): Co-owners hold defined percentage shares (for example, 50/50, 70/30, or 25/25/25/25) without automatic survivorship rights. If one co-owner applies for a homestead exemption, their exemption is prorated strictly by their deeded fractional percentage.
• Joint Tenancy with Right of Survivorship (JTWROS): Co-owners hold equal, undivided ownership shares. When both joint tenants occupy the home as their primary residence, they combine to claim 100% of the available exemption benefit.

The Fractional Exemption Formula: A Real-World Example

Consider two unmarried partners who purchase a home together as tenants in common, with Partner A owning 60% and Partner B owning 40%:

If both partners occupy the home as their primary residence and each applies for the homestead exemption, Partner A receives 60% of the maximum exemption dollar amount and Partner B receives 40%, totaling 100% of the homestead benefit.

However, suppose Partner A lives in the home as their primary residence, but Partner B lives and works in another state. In that scenario, only Partner A qualifies for an exemption. The county will grant only 60% of the standard homestead exemption. The remaining 40% interest of the property is classified as non-homestead and taxed at full value without exemption.

How Senior and Veteran Exemptions Apply to Co-Owners

Fractional allocation becomes particularly critical when one co-owner qualifies for specialized age or military exemptions:

Suppose an adult daughter (owning 50%) and her 70-year-old father (owning 50%) co-own a home as tenants in common. The father qualifies for a senior citizen exemption or veteran property tax break. Under state rules, the father's senior or veteran deduction applies only to his 50% ownership interest in the assessed valuation, not to the daughter's share.

Filing Requirements for Unmarried Co-Owners

When filing an exemption application with the county appraisal district, unmarried co-owners must take specific administrative steps:

• Submit the Recorded Deed: Provide a recorded deed clearly detailing the percentage interest of each co-owner.
• Separate Exemption Applications: In many counties, each unmarried co-owner must submit their own individual application form with matching driver's licenses.
• Affidavit of Ownership: If the deed does not state ownership percentages, the law generally presumes equal shares unless an executed co-ownership affidavit is provided.

Co-ownership allows buyers to achieve homeownership together, but understanding fractional homestead tax rules avoids unexpected property tax bills. Ensure your deed accurately reflects your intended ownership shares before filing with the county assessor.