QUICK ANSWER

On the Texas exam, three form types get confused. An addendum adds supplemental terms to a contract, usually attached when the contract is formed, like the Third Party Financing Addendum. An amendment changes a term of a contract that is already signed and executed, like moving the closing date or the price, and both parties sign it. A notice is a one-party communication that exercises a right the party already holds, like the Notice of Buyer's Termination of Contract delivered during the option period. Addendum adds, amendment changes, notice exercises.

EXAM PREP ONLY

This guide explains TREC form categories for the Texas sales agent exam. It is educational content, not legal advice. TREC revises its promulgated forms periodically, so verify the current version before you rely on any point. Confirm the primary sources below and work under your sponsoring broker.

Addendum
adds terms, usually at contract formation
Amendment
changes a term of an executed contract
Notice
exercises a right one party already holds
2 signers
an amendment needs both parties, a notice does not

What is an addendum?

Snippet answer: An addendum is a promulgated form that adds supplemental terms to a contract. It is usually prepared and attached when the contract is formed, and it becomes part of the agreement the parties sign. Common examples are the Third Party Financing Addendum, the addendum for mandatory property owners association membership, and the temporary residential leases.

Think of an addendum as a bolt-on. The base contract cannot cover every situation, so TREC promulgates addenda that attach the extra terms a specific deal needs.

You reach for an addendum when a condition of the deal needs its own terms. A buyer getting a lender loan needs the Third Party Financing Addendum. A home in a mandatory homeowners association needs the property owners association addendum. A seller staying past closing needs the Seller's Temporary Residential Lease.

The key exam idea is timing and role. An addendum is normally part of the deal from the start, and it defines terms rather than changing terms that already exist.

What is an amendment?

Snippet answer: An amendment changes a term of a contract that is already executed. The TREC Amendment form is used to modify an existing contract, for example to change the sales price, move the closing date, or reflect agreed repairs after an inspection. Both the buyer and the seller sign the amendment for the change to take effect.

An amendment is a mutual do-over of one or more terms. The parties already have a binding contract, and now they agree to change something in it.

The classic trigger is the inspection. During the option period the buyer inspects, asks for repairs or a price reduction, and if the seller agrees, that agreement is written on an Amendment. Another common trigger is extending the closing date when a lender needs more time.

TREC's own guidance points here. When asked how to extend the time on or otherwise change a One to Four Family Residential Contract, TREC directs license holders to the Amendment. It changes the executed contract by mutual agreement.

Want to test this by scenario instead of by definition? Run the free "Which TREC form applies?" trainer and see the amendment, addendum, and notice choices in context.

What is a notice?

Snippet answer: A notice is a one-party communication that exercises a right the party already holds under the contract. It does not require the other party's signature to be effective. The Notice of Buyer's Termination of Contract is the common example, delivered to end the contract under a right such as terminating during the option period.

A notice is not a negotiation. It is one side telling the other that it is using a right the contract already gave it.

The buyer's option-period termination is the cleanest example. The buyer paid the option fee for the unrestricted right to terminate, so when the buyer walks, they deliver a notice. The seller does not have to agree, because the buyer is exercising a right, not asking for a change.

That is the distinction students miss. An amendment needs both signatures because it changes the deal. A notice needs only the delivering party because it exercises an existing right.

Amendment vs addendum vs notice: the decision

Snippet answer: Match the form to the job. If you are adding terms as the contract forms, use an addendum. If you are changing a term of a contract already signed, use an amendment. If you are exercising a right you already hold, deliver a notice. Only the amendment always needs both signatures.

Question Form Signatures Example
Adding terms to the deal? Addendum Both, as part of the contract Third Party Financing Addendum
Changing a signed contract? Amendment Both parties sign Move the closing date
Exercising a right you hold? Notice Delivering party only Notice of Buyer's Termination

Read the timing first. Before or at formation points to an addendum. After execution points to an amendment or a notice. Then read who has to agree. If both must agree, it is an amendment. If one party is exercising a right, it is a notice.

How the exam tests this

Snippet answer: Exam questions describe a situation and ask which form is correct. The traps are using an amendment to add a financing condition that belongs in an addendum, using an addendum to change an executed contract that needs an amendment, and thinking a termination notice needs the seller's agreement when it does not.

Watch for these patterns.

  • A buyer needs lender financing. That is a condition added at formation, so it is the Third Party Financing Addendum, not an amendment.
  • The parties agree to lower the price after inspection. That changes an executed contract, so it is an Amendment.
  • The buyer terminates during the option period. That exercises a right, so it is a Notice, and the seller's agreement is not required.
  • The seller will stay a week after closing. That adds terms, so it is the Seller's Temporary Residential Lease addendum.

Say the verbs to yourself. Add, change, exercise. Addendum adds, amendment changes, notice exercises.

Who may fill out these forms?

Snippet answer: A sales agent may complete TREC promulgated forms by filling in the blanks and attaching the correct addenda, working under a sponsoring broker. An agent may not draft contract language or add clauses that define the parties' legal rights and remedies. Under TREC Rule 537.11, drafting language such as escalation, appraisal, or contingency clauses is prohibited.

Form selection is exam material, but so is the limit on what an agent may do with the form. You choose the right promulgated form and complete its blanks. You do not write new contract language.

This ties to the unauthorized practice of law. Drafting terms that create or affect legal rights crosses into practicing law, which a license holder may not do. When a deal needs custom language, the parties use an attorney.

Frequently asked questions

Is an addendum the same as an amendment?

No. An addendum adds supplemental terms, usually when the contract is formed, and it becomes part of the agreement. An amendment changes a term of a contract that is already executed. If the contract already exists and you are changing it, use an amendment.

Does a notice need both parties to sign?

No. A notice exercises a right one party already holds, so only the delivering party is required. The Notice of Buyer's Termination of Contract is effective when properly delivered, and the seller does not have to agree to it.

Which form changes the closing date on a signed contract?

The Amendment. Changing a term of an executed contract, such as the closing date or the price, is done with the TREC Amendment form, signed by both the buyer and the seller.

Is the Third Party Financing Addendum an addendum or an amendment?

It is an addendum. It adds a financing condition to the contract, usually at formation. It is not changing an already-executed term, so it is not an amendment.

Can a sales agent write a custom clause on an amendment?

No. An agent completes promulgated forms but may not draft language that defines or affects the parties' rights and remedies. TREC Rule 537.11 lists escalation, appraisal, and contingency clauses as examples an agent may not draft. Custom language is for an attorney.

Practice questions

1. The buyer and seller have an executed contract and now agree to move the closing date back one week. Which form do they use? A. Third Party Financing Addendum B. Amendment C. Notice of Buyer's Termination D. Addendum for Back-Up Contract

Answer: B. Changing a term of an already-executed contract is done with an Amendment, signed by both parties. The addenda add terms, and a notice exercises a right.

2. A buyer will obtain a new loan from a lender as a condition of the purchase. What is attached to the contract? A. An Amendment B. A Notice C. The Third Party Financing Addendum D. The Seller's Temporary Residential Lease

Answer: C. A financing condition added at formation uses the Third Party Financing Addendum. It adds terms, so it is an addendum, not an amendment.

3. During the option period, the buyer decides to terminate. Which statement is correct? A. The buyer files an amendment that the seller must sign B. The buyer delivers a notice, and the seller's agreement is not required C. The buyer must attach a new addendum D. The buyer cannot terminate once the contract is executed

Answer: B. Option-period termination exercises a right the buyer already holds, so it is a notice. The seller does not have to agree for it to be effective.

4. Which document normally needs the signatures of both the buyer and the seller to take effect? A. A notice of termination B. An amendment C. A seller's unilateral disclosure D. A buyer's option notice

Answer: B. An amendment changes the contract by mutual agreement, so both parties sign. A notice is effective when the delivering party sends it.

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Sources and methodology

This guide was written from TREC promulgated form categories and Texas primary sources, and reverified on July 21, 2026. It teaches exam-level form recognition, not legal advice.

  • The addendum, amendment, and notice roles come from the TREC promulgated contract forms and addenda and the TREC contract FAQs.
  • The rule that changing an executed contract uses the Amendment comes from TREC's contract guidance.
  • The limits on what a license holder may draft come from TREC Rule 537.11 on the unauthorized practice of law.
  • Form versions change periodically through the TREC Broker-Lawyer Committee. Use the current promulgated version in practice.

Official source links

This article is exam-prep education for the Texas real estate sales agent license. It is not legal advice. TREC promulgated forms and their proper use depend on current Texas law and the current form versions. Always confirm the current TREC forms and rules and work under the supervision of your sponsoring broker before acting.