In Texas , an addendum is a document added to a contract that modifies, supplements, or adds specific terms to the original agreement. The Texas Commission (TREC) promulgates several mandatory addenda that licensees must use in specified transaction types. Understanding which addenda are promulgated (required), when each must be used, and what each covers is both a practical requirement for working as a estate agent and a significant component of the estate licensing examinations.
TREC addenda are distinct from contract forms in that they do not stand alone — they are attached to and become part of a base contract (typically the One to Four Contract or another promulgated contract form). Each addendum addresses a specific issue or contingency that the base contract form does not cover in sufficient detail. When the circumstances of a transaction trigger the use of a required addendum, the licensee must attach it to the contract — failure to use a required promulgated addendum where one is indicated is a violation of .
Texas law requires that licensees use TREC-promulgated forms in the transactions they handle — they may not substitute forms created by attorneys, brokers, or other sources for the promulgated versions in ordinary residential transactions. Licensed attorneys, however, may draft alternative forms for their own client transactions. The use of unauthorized forms by licensees exposes them to disciplinary action by TREC and potentially to civil liability. This mandatory-use rule makes familiarity with the specific promulgated addenda and their proper application critical knowledge for any Texas agent or broker.
For the estate licensing exam, questions about addenda frequently test whether candidates know which addendum is required for specific transaction scenarios, what each addendum accomplishes, and what specific terms and conditions are included in commonly tested forms. The HOA addendum, Third Party Financing Addendum, and Addendum for Sale of Other Property by Buyer are among the most heavily tested addendum topics on the state licensing exam.
Candidates preparing for the estate licensing exam should approach addenda study as a distinct topic area rather than an afterthought to contract law. The exam dedicates a significant portion of its contract-related questions to addenda — testing when each must be used, what each requires the parties to do, and what happens when the conditions of an addendum are not met. Building a systematic mental framework of addendum trigger conditions and key provisions is more effective preparation than trying to read and memorize each form in full.
The distinction between promulgated and non-promulgated addenda is fundamental to Texas practice. A promulgated addendum is one that has been officially approved and required by TREC for use in specific transaction types. A non-promulgated addendum is one drafted outside the TREC form system — typically by attorneys or commercial brokers for specialized transactions. estate licensees engaged in most residential transactions must use the promulgated version of each applicable addendum, not a substitute.
TREC updates its promulgated forms periodically. When TREC issues a new or revised version of an addendum, the old version is eventually retired and transition to using the current version. Staying current with TREC form updates is part of the ongoing compliance responsibility for Texas licensees. The (trec.texas.gov) maintains the current versions of all promulgated forms and addenda and is the authoritative source for current form numbers and content.
The Texas Association of Realtors (TAR) also publishes its own set of forms that supplement TREC promulgated forms for members. TAR forms are not TREC-promulgated and are available only to TAR members. When a TAR form exists alongside a TREC promulgated form covering similar ground, licensees must understand which is mandatory and which is optional. In transactions where a TREC form is promulgated and applicable, it takes precedence over TAR alternatives.
On the TREC licensing exam, questions about the promulgated versus non-promulgated distinction frequently appear as scenario-based questions: given a transaction type, which form must the licensee use? Which party may draft an alternative addendum? What is the consequence of using a non-promulgated form in place of a promulgated one? Mastering these conceptual distinctions — not just knowing the names of individual forms — is the level of knowledge required to answer exam questions correctly.
The update cycle for TREC promulgated forms can create a practical challenge for agents who use forms regularly. When TREC issues a revised version of a form, the old version typically has a brief window during which it can still be used before the new version becomes mandatory. Missing the transition deadline and using an outdated form creates technical compliance issues.
Most software platforms that generate automatically update to new versions — agents who generate forms manually from the TREC website should confirm they are downloading the current version by checking the form number and effective date listed on the footer of each form.
Texas real estate licensees must use TREC-promulgated forms when they are required and available for the type of transaction being conducted. Using a non-promulgated form in place of a promulgated one is a violation of TREC rules regardless of the reason. Only a licensed attorney acting on behalf of a client may draft alternative language. Agents and brokers do not have this authority. The mandatory-use requirement exists to protect consumers and standardize transaction documentation across Texas.
The Addendum for Property Subject to Mandatory Membership in an Owners' Association — commonly called the HOA Addendum or TREC Form 36-9 — is one of the most commonly used and heavily tested TREC addenda. It is required whenever the property being purchased is subject to a mandatory homeowners' association that charges dues, assessments, or other fees. This addendum protects the buyer by establishing what HOA-related information the seller and creating a termination right if certain conditions are not met.
Under the HOA Addendum, the seller is required to provide the buyer with a Subdivision Information Form (SIF) — a document that discloses HOA fees, pending assessments, rules and restrictions, and other relevant association information. The buyer has a specified number of days after receiving the SIF to review it and, if not satisfied, to terminate the contract. This review period and termination right are the core buyer protections provided by the addendum.
The HOA Addendum also addresses who is responsible for obtaining the SIF, the costs of obtaining it, and how those costs are handled between buyer and seller. Some HOAs charge a fee to prepare the SIF, and the addendum allocates this expense. understand who is responsible for ordering the SIF, when it must be delivered, what happens if it is not delivered on time, and how the termination right works — all of these details are fair game for exam questions.
For the TREC licensing exam, the HOA Addendum is tested in several ways: which transactions require it (any property with mandatory HOA membership), who is responsible for obtaining the SIF, how long the buyer has to review it, what the buyer can do if dissatisfied, and what happens if the addendum is not used when required. Candidates should know Form 36-9 by its common name, purpose, and key operative provisions.
One aspect of the HOA Addendum that is frequently misunderstood is the deadline structure. The addendum specifies the number of days the seller has to deliver the SIF after the contract execution date, and a separate number of days the buyer has to review it once received. These are sequential deadlines, not simultaneous.
If the seller delivers the SIF late, the buyer's review period still runs from the actual delivery date — but the seller's failure to deliver on time may give the buyer additional rights depending on the specific contract terms. Understanding this sequential structure is important for both agents and exam candidates.
The Addendum Concerning Right to Terminate Due to Lender's Appraisal — commonly called the Third Party Financing Addendum — is used when the buyer is financing the purchase with a mortgage loan. It establishes buyer protections related to lender approval and property appraisal, and creates specific termination rights if financing or appraisal conditions are not met.
Several other promulgated TREC addenda appear on the licensing exam and in common residential transactions.
The Addendum Regarding Municipal Utility District (MUD Addendum) is required when the property is located within a Municipal Utility District — a special-purpose governmental entity that provides utility services (water, sewer, drainage) to a development and has the authority to levy taxes and assessments on property within its boundaries. The MUD Addendum discloses the existence of the district, the current tax rate, any outstanding bonds, and other financial obligations associated with the district that the buyer assumes upon purchase.
MUDs are common in Texas suburban developments, particularly in the Houston metropolitan area and other fast-growing suburban rings around major Texas cities. Buyers purchasing in a MUD area without understanding the MUD tax rate and bond obligations can face unexpected annual tax bills that significantly exceed the county tax rate they may have anticipated. The MUD Addendum is specifically designed to ensure that buyers receive this information before they are contractually committed to the purchase.
The Seller's Disclosure Notice — while technically not an addendum to the contract but a separate statutory disclosure document — works in conjunction with the contract addenda system to provide buyers with comprehensive information about the property's condition and known material defects. Texas law requires sellers of residential property to provide the Seller's Disclosure Notice unless a specific exemption applies. know which transactions require the disclosure and which are exempt (such as foreclosure sales, transfers between family members, and new construction sold directly by the builder).
For the TREC licensing exam, the MUD Addendum is tested primarily through scenario questions: does this transaction require a MUD Addendum? What information is the seller required to disclose about the MUD? What are the buyer's rights if the MUD information reveals unexpectedly high obligations? Candidates who understand the purpose and key provisions of the MUD Addendum can answer these questions correctly even when the exam uses variations in transaction detail that require applying principles rather than recalling memorized text.
One important nuance about the MUD Addendum involves what happens after the buyer receives the MUD disclosure. Unlike the HOA Addendum, which gives the buyer an explicit termination right based on dissatisfaction with the SIF, the MUD Addendum is primarily a disclosure document — it informs the buyer of the MUD's existence and financial structure rather than creating an independent termination right based on the disclosure alone.
The buyer's option to terminate the contract based on MUD disclosure must be exercised through the termination option period or other contractual provisions, not through a specific MUD-based right in most standard residential contracts. Scenario practice builds this analytical skill more effectively than passive reading of form text.
Required for properties subject to mandatory HOA membership. Triggers delivery of Subdivision Information Form (SIF) and gives buyer a review period with termination right if dissatisfied with HOA terms or fees.
Required when buyer uses a mortgage loan. Establishes financing approval deadline, lender appraisal protections, and buyer's right to terminate if financing or appraisal conditions are not met.
Used when buyer's purchase is contingent on selling their current home. Defines the contingency period and seller's right to continue marketing with a kick-out clause allowing acceptance of other offers.
Required for properties within a Municipal Utility District. Discloses MUD tax rates, outstanding bonds, and financial obligations the buyer assumes. Particularly common in Houston-area suburban developments.
The estate licensing exam tests addendum knowledge through a combination of scenario-based questions and conceptual questions about when each addendum is required, what it covers, and what rights it creates. Understanding the exam's approach to addenda helps candidates prepare efficiently rather than attempting to memorize every provision of every form.
Scenario-based questions present a transaction situation and ask which addendum is required or what the parties' rights are. For example: a buyer is purchasing a property in a subdivision with a mandatory HOA and is using a mortgage loan — which addenda are required? The answer involves identifying both the HOA Addendum and the Third Party Financing Addendum. Candidates who understand the trigger condition for each addendum — what fact about the transaction requires it — can answer these questions without needing to memorize form numbers.
Conceptual questions about addenda often test the distinction between promulgated and non-promulgated forms, the mandatory-use requirement, and the consequences of non-compliance. Questions may also test the specific rights created by each addendum — such as the buyer's termination right under the HOA Addendum or the appraisal protection under the Third Party Financing Addendum. These are the operative provisions that protect buyers in real transactions and that the exam treats as critical knowledge.
Time-sequencing questions about addenda test candidates' understanding of deadlines: when must the SIF be delivered under the HOA Addendum? How long does the buyer have to review it? When does the financing approval deadline run under the Third Party Financing Addendum? These timing details are precise and exam questions test them specifically. Creating a summary of the key deadlines and action triggers for each major addendum — organized by the form name and the triggering condition — is an effective study technique for this exam content area.
One study technique that works particularly well for addendum exam content is creating a two-column reference chart: on one side, list the transaction scenario or condition that triggers each addendum; on the other side, list the key operative provisions and rights each addendum creates. This format directly mirrors how exam questions are structured — they give you the scenario and ask which addendum applies or what rights the buyer has. Practicing with this chart until you can answer both columns from memory produces the kind of reliable, retrievable knowledge that exam conditions require.
Agents who work with first-time homebuyers or buyers relocating to Texas from other states often encounter confusion about the role and purpose of TREC addenda. Buyers who have purchased homes in other states may be unfamiliar with the promulgated form system and may question why specific addenda must be used rather than letting their attorney or agent draft custom language.
Taking a few minutes to explain the TREC mandatory-use framework — and why it exists to protect buyers through standardized, tested language — builds client confidence and reduces the risk of misunderstandings during the transaction. It also reinforces why using the correct form is the agent's professional responsibility, not just an optional procedural preference.