The short answer
In Texas you can protest the value the appraisal district assigns to your home. In Denton County that means filing a protest with the Denton Central Appraisal District, usually by the deadline on your notice of appraised value, and then presenting evidence informally to the district or at an Appraisal Review Board (ARB) hearing.
You can't protest the tax rate itself through this process. You're arguing that your home's market value, or its value compared with similar homes, is lower than the district says.
Read your notice before you file
Your notice shows the market value and, if you have a homestead exemption, the capped appraised value. Check the property details the district has on file: square footage, number of baths, pool, lot size and condition. Errors in those records are some of the simplest wins.
The Texas Comptroller's guide to property tax protests explains the general deadlines. In most cases the deadline is May 15 or 30 days after the notice was delivered, whichever is later, but confirm the date on your notice.
What evidence helps
Recent sales of truly similar homes near you that sold for less than your appraised value, ideally from around January 1 of the tax year. Photos and repair estimates for problems that a buyer would discount: foundation movement, roof damage, an outdated kitchen, drainage issues. A recent appraisal or closing statement if you bought the home recently.
You can request the evidence the appraisal district plans to use before your hearing. Reviewing it helps you respond to the specific comparisons they rely on.
At the hearing
Many protests settle at an informal meeting with an appraiser before an ARB hearing. If you go to the hearing, keep it short and factual: what value you're requesting, the comparable sales and condition evidence that support it, and copies for the panel. Stay calm and organized.
If you disagree with the ARB decision, Texas offers further options such as binding arbitration or district court, each with its own requirements and deadlines. Check the Comptroller's guidance before pursuing them.
Should you hire a tax consultant?
Some homeowners hire a property tax consultant who works for a share of the savings. Others do it themselves in an afternoon. If your home is unusual or the dollars are large, help may be worth it; if your home is typical and you have good comparable sales, you can often present the case yourself.
If you want a property-specific look at recent sales, Shaune Corbett Group's Home Value Request can be a useful starting point for gathering comparable sales.