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About O’Connor & Associates

O’Connor is the largest property tax consulting firm in the United States. O’Connor’s team of professionals possess the resources and unparalleled market expertise in the areas of property tax, cost segregation, and commercial and residential real estate appraisals. The firm was founded in 1974 and employs more than 900 professionals worldwide.

With our proprietary protest filing system, we coordinate more lawsuits and settle more binding arbitration cases than any other tax consulting firm in the nation.

  • O’Connor provides its customers with property tax protest values ranging from $5,000 to $100 million.
  • In 2023, the firm filed more than 295,000 protests on behalf of its residential and commercial clients. This lowered assessed values by $6.7 billion.
  • For the 2022 tax year, the firm lowered assessed values by more than $5.7 billion. The appeals resulted in an estimated tax savings of around $154 million (not including exemption data).


O’Connor’s mission is to be the leading property tax advocate for taxpayers and to drive reforms in the Texas property tax appeal process. Our proven solutions continue to help taxpayers reduce their annual property tax rates. We are a pioneering expert in aggressive property tax reduction. O’Connor is also a leading expert in business personal property valuation. The book What You Need to Know about Personal Property Valuation was written by Patrick O’Connor, President of O’Connor.

Your property taxes will be aggressively protested every year by the #1 property tax firm in the country. If your taxes are not reduced you PAY NOTHING, and a portion of the tax savings is the only fee you pay when your taxes are reduced! Many FREE benefits come with enrollment.

Property Tax Protection Program Benefits