How to Appeal Property Taxes in Collin County, Texas (2026 Guide)

Direct answer: For most Collin County homeowners, the 2026 deadline to protest a real-property appraisal was midnight Friday, May 15, 2026. File with the Collin Appraisal Review Board (ARB) through Collin CAD’s Taxpayer Portal, or deliver/mail a written protest to Collin Central Appraisal District, 250 Eldorado Pkwy, McKinney, TX 75069.

As of July 13, 2026, the normal 2026 residential protest window has closed. Late protests are limited—most importantly, good-cause late protests before ARB approval of the records, or certain notice-failure and correction remedies.

How assessments work in Collin County

Collin Central Appraisal District values taxable property in Collin County each year at market value as of January 1. For 2026, January 1, 2026 is the valuation date, real estate notices were scheduled to mail April 15, and the district’s reappraisal plan set May 15 as the timely filing deadline for real estate notices dated April 15.

The CAD does not set your tax rate or collect your taxes. It sets the value and administers exemptions; cities, school districts, the county, Collin College, MUDs/WCIDs, and other taxing units adopt rates later. Collin CAD says tax-rate information for the year is updated through CollinTaxes.org during August and September.

For residential property, Collin CAD uses mass appraisal methods. That means the appraiser studies market areas, verified sales, permits, inspections, aerial/oblique imagery, closing statements, appraisals, listing data, and property characteristics such as building class, quality, square footage, condition, depreciation, and location. The three appraisal approaches are cost, direct sales comparison, and income; residential protests usually turn on the sales comparison approach and equal/uniform appraisal.

A key local detail: Collin CAD’s own May 2026 protest report said 148,066 protests had been filed as of May 15, including about 119,974 residential protests; agents filed about 132,675, while owners filed about 15,391 directly. The district estimated those protested properties represented about $138 billion, or 41% of the appraisal roll. Collin CAD did not publish a 2026 median reduction or homeowner success rate in the official sources reviewed, so do not rely on anyone promising an “average” savings.

Whether you should appeal

Appeal if you can show one of two things: market value is too high or your value is unequal compared with similar properties. Collin CAD’s 2026 protest form has a combined “Market & Equity” reason—use it if both may apply.

Good evidence in Collin County is concrete and property-specific:

• A 2025 or very early 2026 arm’s-length purchase price, closing disclosure, sales contract, or appraisal.
• Comparable sales from your subdivision or nearby market area, adjusted for size, age, condition, pool, lot, and upgrades.
• Photos and contractor estimates for foundation, roof, water, HVAC, drainage, or interior condition issues that existed on January 1, 2026.
• Evidence that CAD has the wrong square footage, construction quality, pool, garage, finished area, or condition.
• A list of similar neighboring properties assessed lower on a per-square-foot basis.

Be realistic: arguing “my taxes are too high” will not win by itself. The ARB decides the appraised value or another protest issue; it does not lower city, county, school, MUD, or PID rates.

Also check exemptions before you protest. Collin CAD’s residence homestead application is Form 50-114 / CCAD-114, Residential Homestead Exemption Application. It covers the general homestead, over-65, disabled person, 100% disabled veteran, and over-55 surviving spouse situations. For 2025 rates, the Collin County rate sheet listed Collin County’s own homestead exemption as 5% / $5,000 minimum, Collin College as 20% / $5,000 minimum, and school districts with a $140,000 homestead exemption. Cities vary: Plano and Frisco listed 20% homestead exemptions, while McKinney listed no general city homestead exemption on that sheet.

Step-by-step how to file

1. Find your notice and PIN. The Taxpayer Portal requires your Owner ID and eFile PIN from the mailed Notice of Appraised Value or exemption notice. Newly purchased owners should not use the prior owner’s PIN.

2. Use the right form if filing on paper. Collin CAD’s local 2026 form is “Property Appraisal – Notice of Protest – Tax Year 2026,” form CCAD-132 [Rev 2026-v1]. The Comptroller’s general form is Form 50-132, Property Owner’s Notice of Protest; Collin’s own form is better because it includes local hearing choices and instructions.

3. Choose a filing method. Collin CAD says protests must be filed through the Online Appeals / Taxpayer Portal, by mail, in person, or by drop box. The Taxpayer Portal is at OnlinePortal.CollinCAD.org. Mail or deliver to: Collin Central Appraisal District, 250 Eldorado Pkwy, McKinney, TX 75069. The drop box is outside the main entrance.

4. Do not file by email or fax. Collin CAD’s informal-review instructions say the ARB will not accept protests filed by fax, email, or helpdesk. Email is used later for certain hearing evidence or ARB communications, not for starting the protest.

5. State your opinion of value. Put the value you believe is correct. If you do not know yet, file before the deadline anyway and upload evidence later.

6. Upload evidence early. Collin CAD asks for evidence in PDF if possible through the Online Appeals portal. It will accept Word, Excel, PowerPoint, and common image files, but not audio/video files, HEIC/HEIF, external links, flash drives, memory cards, phones, tablets, or media that cannot be retained. Total combined file size is limited to 20 MB per property.

There is no listed fee to file the initial protest with the ARB. Fees or deposits can apply only if you later appeal the ARB order to district court, binding arbitration, or SOAH.

What happens after

First, Collin CAD staff may conduct an informal review. For in-person informal reviews, homeowners schedule using the QR code on the appraisal notice. Filing an informal review alone is not enough—you must file a written protest by the deadline to preserve ARB rights.

If unresolved, the Collin Appraisal Review Board schedules a hearing. It is an independent citizen board that resolves disputes between taxpayers and the appraisal district. Hearings are held at 250 Eldorado Pkwy, McKinney, and Collin CAD’s workflow says residential and commercial hearings typically run from mid-May to early July. For 2026, the reappraisal plan set ARB panels to meet May 22 through July 10, and the May protest report said the ARB would run 16 panels concurrently.

You can appear in person, by notarized affidavit or written declaration only, or by telephone/video conference if requested. For a phone or video hearing in 2026, Collin’s procedures require a written request no later than the 5th day before the hearing if you have no agent, or the 10th day before if you do have an agent. Phone/video participants must submit evidence with an affidavit or declaration before the hearing; the ARB requests it three business days before.

At the hearing, the district appraiser and recorder are in the panel room, proceedings are audio recorded, witnesses testify under oath, and each side generally gets 5 minutes to present evidence plus time for rebuttal or clarifying questions. The panel is evidence-driven—think of it like a short, document-heavy bench hearing. The ARB then renders a decision and sends its final order by certified mail with appeal rights.

If you still disagree, you generally have 60 days from receiving the ARB order to seek district court review or regular binding arbitration if eligible, and 30 days for a SOAH appeal if eligible.

Local tips

• Use both market and equity when appropriate. Collin’s form lets you check “Market & Equity.” That protects both arguments.
• Lead with Collin-specific comps. A Plano comp is usually not helpful for a McKinney, Frisco, Celina, or Princeton subdivision unless the market area truly overlaps.
• Watch new-construction and purchase-year resets. Collin CAD uses permits, construction data, and percent-complete reviews. If your January 1 condition was incomplete or damaged, prove it with dated photos and builder documents.
• PID/MUD areas need extra caution. The county rate sheet lists many MUDs and PID assessments. A value reduction lowers ad valorem taxes, but a PID assessment may be calculated separately and may not drop dollar-for-dollar.
• Worked savings example: assume a Frisco ISD homeowner in Frisco with Collin County, Frisco ISD, City of Frisco, and Collin College only. Using 2025 listed rates—County 0.149343, Frisco ISD 1.019400, Frisco City 0.425517, Collin College 0.081220—the combined rate is 1.67548% before any MUD/PID. If the ARB reduces taxable value by $40,000, estimated annual savings are $40,000 × 1.67548% = about $670. Your actual savings depend on homestead caps, exemptions, school-tax ceilings, MUD/PID units, and the final 2026 rates adopted later in the year.