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Dealer’s Heavy Equipment Inventory Tax Statement (Form 50-266), page 1
Complex · 74/100Form Complexity Index

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What this form asks for

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Form 50-266 is a confidential quarterly property tax statement required for dealers who hold heavy equipment inventory in Texas. It reports each item of heavy equipment sold, leased, or rented during the preceding quarter and calculates the unit property tax due using the local unit property tax factor. The form must be filed with payment to the county tax assessor-collector (not the Texas Comptroller) by the 20th day of the month following each quarter. Timely filing is important to avoid statutory penalties and to document compliance with recordkeeping and audit requirements.
Fillable fields170
Pages3
Sections30
Tables and lists1
Form Complexity IndexComplex, 74/100

The AI checks your answers before you download

17 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Appraisal District Account Number presence and format validation

Validates that the Appraisal District Account Number is provided and matches the expected local account number format (e.g., allowed characters, length, and no placeholder text). This is critical to correctly associate the filing and payment with the dealer’s account in the county system. If missing or malformed, the submission should be rejected or routed to an exception queue for manual resolution because payment may be misapplied.

Reporting Quarter and Year completeness and valid range check

Ensures the Reporting Quarter and Year are present, the quarter is one of Q1–Q4, and the year is a valid four-digit year within an acceptable range (e.g., current year ± a configured tolerance). This prevents misclassification of the filing period and incorrect delinquency/penalty calculations. If invalid, the system should block submission and prompt the filer to correct the reporting period.

Dealer identity fields required (Section 1) and non-placeholder text check

Checks that the dealer name and mailing address are completed and not left blank or filled with underscores/placeholder characters. These fields are required to identify the taxpayer and to support correspondence and payment reconciliation. If incomplete, the form should fail validation and require completion before acceptance.

Dealer phone number format validation (Section 1)

Validates that the dealer phone number includes an area code and contains only valid phone characters, and normalizes to a standard format (e.g., 10 digits for US numbers). A valid phone number is important for resolving discrepancies quickly and for compliance follow-up. If the phone number is missing or invalid, the system should flag the record and require correction (or allow submission with a warning if policy permits).

Email address format validation (Dealer and Authorized Representative)

Ensures any provided email address conforms to standard email syntax (local-part@domain) and is not obviously invalid (e.g., missing '@' or domain). Email is often used for confirmations and deficiency notices, so invalid emails reduce successful communication. If invalid, the system should reject the email field and require correction or allow submission only if email is optional per configuration.

Authorized Representative section requiredness and authority selection logic (Section 2)

If the filer is not an individual dealer filing on their own behalf, validates that Section 2 is completed, including at least one authority basis checkbox selection. This ensures the person signing has legal authority to file and certify the statement. If no authority is selected (or Section 2 is blank when required), the submission should be rejected as unauthorized.

And 11 more checks
  • Agent for tax matters requires Form 50-162 attachment indicator
  • Business information completeness and physical address validation (Section 3)
  • Date Business Opened format and logical constraint check (Section 3)
  • Inventory Schedule presence or 'no transactions' declaration validation (Section 4)
  • Inventory line item required fields and column conformity check (Section 4)
  • Type of Sale/Lease/Rental code validation and allowed set enforcement
  • Transaction amount and sale/lease/rental amount numeric validation
  • Unit Property Tax Factor presence, numeric format, and reasonableness check
  • Unit property tax calculation consistency by transaction type
  • Totals reconciliation across schedule pages and quarterly totals (Sections 4 and 5)
  • Certification and signature completeness with date validation (Section 6)

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How to Fill Out Form 50-266 Online for Free in 2026

What the AI walks you through.

  1. Enter the appraisal district account number (or attach supporting documentation if unavailable) and the reporting quarter and year, and confirm the correct county assessor-collector mailing address for submission with payment.
  2. Complete Section 1 with the dealer’s identifying information (dealer name, phone, email, and mailing address).
  3. If applicable, complete Section 2 by identifying the authorized representative, selecting the basis of authority (e.g., officer, partner, attorney, or tax agent with Form 50-162), and providing representative contact and mailing information.
  4. Complete Section 3 with the business name and the physical address of the inventory location; attach a list of all business locations where you conduct business and any required account documentation.
  5. Prepare Section 4 (Inventory Schedule) by listing each sale/lease/rental from the preceding quarter (description, type code, price or payment amount, date, item name/serial number, purchaser/lessee/renter) and compute unit property tax using the current unit property tax factor; attach additional sheets or substitute documentation that matches the column headers.
  6. Complete Section 5 by summarizing the number of units and transaction amounts for the quarter by category (Net Heavy Equipment Inventory, Fleet Transactions, Dealer Sales, Subsequent Sales) and total the unit property tax due for the quarter.
  7. Sign and date Section 6 certification (dealer or authorized representative), then submit the completed form and the quarterly tax payment to the county assessor-collector by the filing deadline.

Common Mistakes in Completing Form 50-266

The ones the AI is built to catch.

Using the wrong filing destination (sending to Comptroller instead of county assessor-collector)
People often see “Texas Comptroller” on the form and mistakenly mail the statement and payment to the Comptroller rather than the county tax assessor-collector where the business is located. This can result in the filing being treated as not received, triggering late-file penalties and delayed posting of payments. Always send the completed Form 50-266 and payment to the county assessor-collector listed for the business location, and keep proof of mailing/payment.
Missing the quarterly deadline or using the wrong reporting quarter/year
A frequent error is filing after the 20th day of the month following the quarter, or entering the wrong “Reporting Quarter Year,” especially around year-end. Late filing can lead to a $500-per-month penalty for late statements and additional penalties for late remittance of unit property tax. Confirm the quarter you’re reporting (preceding quarter) and calendar the due date (20th of the next month) before submitting.
Leaving the appraisal district account number blank without attaching supporting documentation
Dealers sometimes don’t know the appraisal district account number and leave it empty without attaching a tax bill or appraisal district/tax office correspondence as instructed. This can slow processing, cause misapplication to the wrong account, or prompt follow-up requests that push the filing past deadlines. If the account number is unavailable, attach the required documentation and ensure the business name/address match what the county has on file.
Confusing dealer name, business name, and physical location address
Many submissions mix the “Name of Dealer” (legal entity), “Name of Business,” mailing address, and the physical address where the inventory is located. This creates mismatches that can affect the unit property tax factor (which depends on location) and can cause the account to be credited incorrectly. Enter the legal dealer name in Section 1, the business name and physical inventory location in Section 3, and use the correct mailing address for correspondence.
Failing to complete Section 2 when required (authorized representative authority not documented)
Non-individual dealers often skip Section 2 or check an authority box without providing the representative’s details or required appointment documentation. If an agent is filing, the form specifically references Tax Code Section 1.111 and a completed/signed Form 50-162, which is commonly omitted. Incomplete authorization can lead to rejection, delays, or requests for resubmission—complete Section 2 fully unless you are an individual dealer filing for yourself.
Not attaching the required inventory schedule or providing non-conforming documentation
A common mistake is submitting only totals (or a generic sales report) without the item-by-item details required by the Inventory Schedule, or attaching documentation that doesn’t match the schedule’s column headers. This can prevent the assessor-collector from verifying unit property tax calculations and may trigger audits or requests for corrected filings. Attach the schedule (or a substitute report) that clearly maps to each required column: description, type code, amount, date, serial/ID, purchaser/lessee/renter, and unit property tax.
Using incorrect or missing type codes (HE/FL/DL/SS) and misclassifying transactions
Dealers frequently miscode transactions or treat fleet transactions, dealer sales, and subsequent sales as taxable net inventory when they may be excluded from net heavy equipment inventory. Misclassification can inflate or understate the unit property tax due and create inconsistencies between Section 4 and Section 5. Use the definitions provided (HE, FL, DL, SS), apply them consistently per transaction, and ensure Section 5 counts/amounts reconcile to the schedule.
Applying the wrong unit property tax factor or calculating it incorrectly
People often reuse last year’s factor, use the wrong location’s factor, or miscompute it (e.g., forgetting to convert a rate “per $100” by dividing by 100 before dividing by 12). This leads to incorrect unit property tax amounts and can result in underpayment penalties or the need for amended filings. Obtain the current factor from the assessor-collector/appraisal district for the correct location and document the factor used on the form.
Incorrect unit property tax calculation for leases/rentals (using total contract value instead of monthly payment received)
For leases and rentals, filers commonly multiply the factor by the full lease term or contract total rather than the monthly lease/rental payment received, as the instructions require. This can significantly overstate tax due and complicate reconciliation with accounting records. For each lease/rental entry, use the monthly payment received for the period and multiply that amount by the unit property tax factor.
Leaving required transaction details blank or inconsistent (dates, serial numbers, purchaser names, amounts)
Missing dates, incomplete serial/identification numbers, or vague purchaser/lessee/renter names are frequent data-entry issues, especially when pulling from invoices that use internal shorthand. Incomplete details reduce traceability, increase audit risk, and often trigger follow-up requests that delay acceptance. Use source documents to enter full legal names, exact transaction dates, complete serial/ID numbers, and amounts that match invoices/receipts.
Not filing a statement for a “no activity” quarter
Some dealers assume that if there were no sales, leases, or rentals, they do not need to file—however, the instructions state a statement is still required indicating no activity. Skipping the filing can trigger the $500-per-month late statement penalty even when no tax is due. Submit the quarterly statement on time and clearly indicate that there were no transactions for the preceding quarter.
Missing certification elements (printed name, signature, date) or signing as the wrong party
Forms are often submitted without the printed name, signature, or date, or signed by someone who is not the dealer or properly authorized representative. An unsigned/undated certification can invalidate the filing and lead to rejection or requests for resubmission, risking late penalties. Ensure the signer matches Section 1/2, print the name clearly, sign, and date the form before mailing with payment.

Frequently Asked Questions About Form 50-266

 

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How does the AI fill out Form 50-266?
You answer a few questions in plain words, or upload a document you already have. The AI reads what you give it and puts each answer into the right field of Form 50-266, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is Form 50-266 to fill out?
Form 50-266 has a Form Complexity Index of 74 out of 100, in the complex tier: 170 fillable fields across 3 pages. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is Form 50-266 (Dealer’s Heavy Equipment Inventory Tax Statement) used for?
Form 50-266 is used by heavy equipment inventory dealers to report heavy equipment sold, leased, or rented during the prior quarter and to submit the related quarterly unit property tax payment under Texas Tax Code Section 23.1242.
Who is required to file this form?
Any dealer that holds heavy equipment inventory and sells, leases, or rents heavy equipment must file this quarterly statement. Even if you had no transactions during the quarter, you must still file a statement indicating no sales, leases, or rentals.
Where do I send Form 50-266 and the payment?
File the completed form and payment with the county tax assessor-collector in the county where the business is located. Do not file this form with the Texas Comptroller of Public Accounts.
When is the filing deadline each quarter?
The statement and payment are due on or before the 20th day of the month following each quarter. For example, Q1 is due by April 20, Q2 by July 20, Q3 by October 20, and Q4 by January 20.
What information do I need before I start filling out the form?
You’ll need your appraisal district account number (if available), the reporting quarter and year, dealer contact information, business location details, and transaction records for each sale/lease/rental in the preceding quarter (including dates, amounts, and buyer/lessee/renter details).
What if I don’t know my appraisal district account number?
If the account number is not available, attach a copy of your tax bill or appraisal district/tax office correspondence that shows the account. The form instructions specifically allow this as a substitute.
Do I have to complete Section 2 (Authorized Representative)?
If you are an individual dealer filing on your own behalf, you can skip Section 2. All other filers must complete Section 2 and indicate the basis of authority (e.g., officer, general partner, attorney, or appointed agent).
If I’m an agent for tax matters, what additional document is required?
If you are an agent appointed under Tax Code Section 1.111, you must have a completed and signed Form 50-162. Indicate that option in Section 2 and ensure the appointment documentation is in place.
What business locations do I report in Section 3?
Report the business name and the physical address of the inventory’s business location. If you conduct business at multiple locations, attach a list showing the name and business address of each location.
How do I complete the Inventory Schedule in Section 4?
List each item sold, leased, or rented in the preceding quarter with the item description/name, identification/serial number, transaction type, date, purchaser/lessee/renter, and the sale/lease/rental amount. You may use additional sheets or attach separate documentation as long as it matches the schedule’s column headers.
What are the transaction type codes (HE, FL, DL, SS) and how do they affect tax?
HE is net heavy equipment inventory transactions; FL is fleet transactions (5+ items to the same buyer in a calendar year); DL is dealer sales; SS is certain dealer-financed subsequent sales. Unit property tax is generally calculated for HE transactions, while FL/DL/SS transactions that are not included in net heavy equipment inventory have unit property tax of $0.
How do I calculate the unit property tax for a sale versus a lease or rental?
For a sale, multiply the sales price by the unit property tax factor. For a lease or rental, multiply the monthly lease/rental payment received by the unit property tax factor.
What is the “unit property tax factor,” and where do I get it?
The unit property tax factor is one-twelfth of the aggregate tax rate for the location where the inventory is located on January 1 of the current year. Contact the tax assessor-collector or the appraisal district to obtain the current factor (the form also explains how it is calculated).
What happens if I file late or don’t pay the unit property tax on time?
A late-filed statement can trigger a $500 penalty for each month (or part of a month) it is late. If unit property tax is not remitted when due, a 5% penalty applies, plus an additional 5% if not paid within 10 days after the due date.
How long do I need to keep records supporting the transactions reported on this form?
You must retain complete and accurate records documenting the disposition of each item sold, leased, or rented for at least four years from the item’s disposition date. The chief appraiser or collector may examine your records under the cited Tax Code sections.
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