It costs nothing unless your bill drops, the Texas fee is 25% against a typical 40% to 50%, and its edge is widest on homes under $250,000. Ownwell appeals your property tax assessment on a contingency basis—you only pay if it successfully lowers your bill. When a county rejects the informal appeal, Ownwell will escalate to a formal one. Dollar figures below are net of the 25% Texas fee, per successful protest. ProsNo upfront Ownwell fee and no charge without savings.