Contracts exam concept
Addendum vs. amendment in real estate
A financing page comes with the offer. A week later, the parties want to change the closing date. Both documents add words to the file, but they do different jobs. Start with whether a contract already exists, then read what the new document does. Its title alone cannot settle the question.
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The short answer
An addendum supplements an agreement, often as part of the original deal. An amendment changes an existing contract. A counteroffer proposes different terms before agreement is reached. These labels overlap in practice: a later document titled Addendum can function as an amendment. For an exam question, identify formation and the document's effect. For an Illinois transaction, also apply the writing, consent, signature and delivery rules; the correct label does not make a change valid.
Reviewed October 24, 2026. This lesson supports National V: Contracts in the June 24, 2026 PSI broker outline. The whole Contracts area accounts for 19 of 100 scored national questions, not 19 questions on addenda and amendments. The basic comparison is national exam vocabulary. The document-handling, compensation and court examples below are specifically Illinois guidance.
Follow the agreement from offer to later change
- Locate formation. Read the offer, response, acceptance requirements and communication. A signature does not establish agreement if the response materially changes the offered terms. A contract can also already exist while an attorney-review or other contract right remains available.
- Identify the function. A financing addendum accepted with the original contract supplies part of the bargain. A later writing that replaces an existing closing date, repair duty or credit is a modification. A request to discuss a change is still only a request until validly adopted.
- Check the actual agreement. Identify the parties, property, contract date and exact paragraph or duty to be changed. Make the replacement term and its effective date clear. Read the priority provision and the rest of the document together; the newest attachment does not automatically override everything. This is a study checklist for reviewing the document, not a template for drafting custom legal terms.
- Check assent, authority and legal requirements. Ross v. May Company states the Illinois common-law modification elements, including offer, acceptance and consideration. An agent needs authority, and a person's silence or a broker's explanation is not a substitute for the required agreement. Writing and signature requirements are a separate question from whether value was exchanged.
- Apply Illinois licensee document rules even to a document that is signed but not yet accepted. Rule 1450.775(b) prohibits a licensee's addition, deletion or alteration without written consent or direction from all signatories. An altered signed document must also have each change signed or initialed by all signatories at the time of the change. Do not use a general verbal approval as a substitute.
- Deliver and retain the complete version. Rule 1450.775(c) requires a true copy to the person signing or initialing within 24 hours of that act. Give the person the original or correction that they adopted, rather than waiting for final acceptance or every other signature. Electronic form can work under the applicable law; it does not supply missing assent or authority.
| Document or action | When it appears | What it does | Example |
|---|---|---|---|
| Addendum | Often part of the original bargain; labels can also be used later. | Supplies supplemental terms that the parties adopt. | Financing terms incorporated in the offer and accepted with it. |
| Counteroffer | While the original offer remains unaccepted. | Proposes a materially different bargain instead of accepting the offer as made. | Seller responds: I will sell for $325,000, not the offered $315,000. |
| Amendment or modification | After a contract exists. | Changes the parties' existing rights or duties if validly adopted. | The parties agree to replace the closing date. |
| Request for discussion | Before or after formation. | Asks about possible terms; does not necessarily reject an offer or change a contract. | Would you consider a later closing? The original proposal remains under consideration. |
| Existing contractual election | After formation, within the existing clause. | Exercises a right the parties already granted. | Buyer gives the extension notice expressly permitted by the agreed clause. |
| Unauthorized alteration | Whenever signed text is changed without the required authority. | Changes the file without establishing a valid agreed modification. | Broker increases a signed credit and sends the revised page to the lender. |
The distinctions that matter
| Distinction | How it works | What to notice |
|---|---|---|
| Attachment vs. adopted contract term | Putting a page in the file does not by itself prove the parties adopted its terms. Check incorporation, assent and any required signature. | Was the page part of the accepted package or merely delivered later? |
| Amendment vs. counteroffer | A modification changes an existing contract. A counteroffer proposes a different bargain before acceptance. A mere inquiry need not be either. | Build the timeline and read the actual response. |
| Amendment vs. contractual notice | An agreed extension clause may already let one party extend by the specified notice. Exercising that right is different from inventing a new extension. | Does the existing clause supply authority and conditions? |
| Assent vs. licensee handling duty | The parties' enforceable bargain and the broker's handling of signed documents are separate issues. Rule 1450.775 applies to signed transaction documents, not just binding contracts. | A pending offer can still be a signed document. |
| Electronic signature vs. authority | An attributable electronic signature can satisfy a form requirement. It does not prove the signer could bind another person or agreed to an incomplete term. | Check who acted, what was adopted and the authority to do so. |
| Purchase agreement vs. brokerage compensation | Buyer-seller terms belong to the purchase agreement. Rule 1450.770(j)-(k) separately governs brokerage commission changes and prohibits using real estate contract forms to change previously agreed commission-payment terms. | Which agreement and which parties govern the fee? |
Work through the facts
Financing addendum delivered with the offer
A buyer submits a purchase offer that expressly incorporates the identified financing addendum. The seller receives and accepts the same complete package without changing its terms.
- The supplemental financing terms accompanied the offer.
- The stated facts establish incorporation and acceptance of the supplemental terms; physical attachment alone would not.
- The seller accepted the original package rather than modifying an existing contract.
Answer: The financing document is an addendum to the original purchase agreement.
The closing moves after formation
An existing purchase contract sets closing for November 3. In exchange for the seller's agreement to move it to November 17, the buyer promises an additional earnest-money deposit sooner than the original agreement required. Assume the agreed change satisfies the applicable formalities and other legal requirements.
- The original contract already exists.
- The later bargain replaces a deadline and adds a new promise; the example supplies an exchange rather than assuming signatures alone provide consideration.
- It changes the existing deal instead of forming the initial bargain.
Answer: This is an amendment or modification. The facts expressly assume the requirements for the change are satisfied.
Seller changes an unaccepted offer
A buyer offers $315,000. Before accepting, the seller communicates a response stating that the seller will sell only for $325,000. No option or other special rule changes the ordinary offer analysis.
- No purchase contract formed at $315,000 because the seller did not accept that offer as written.
- The seller communicates a different required price, not a tentative question about whether the buyer might pay more.
- The seller's changed response proposes a new offer.
Answer: This is a counteroffer, not an amendment.
Repair agreement titled addendum after inspection
After a contract is binding, the parties validly agree to a document titled Inspection Addendum that replaces the seller's repair obligation with a $4,000 closing credit. Assume the required consideration, authority and formalities are satisfied.
- The heading says addendum, but the contract already exists.
- The document replaces an existing duty and creates a different credit obligation.
- Its legal function is a post-formation modification.
Answer: Treat it as an amendment despite the addendum label.
Broker alters the signed credit alone
A licensee changes a seller credit from $3,000 to $5,000 on a signed contract without written consent or direction from all signatories, then sends the edited page to the lender.
- The change affects a financial term in a signed transaction document.
- The licensee lacks the written consent or direction of all signatories.
- The alteration is not transformed into an amendment by delivery to a third party.
- Sending a version to the lender does not supply the missing agreement. It also does not establish that the lender approved the credit.
Answer: This is an unauthorized alteration, not a valid amendment.
Attempt to change commission in purchase amendment
A broker inserts a paragraph in the buyer-seller inspection amendment that reduces compensation stated in a separate buyer brokerage agreement.
- The inspection amendment belongs to the purchase contract between buyer and seller.
- Brokerage compensation is governed by the separate brokerage agreement.
- Illinois rules bar using a real estate contract form to change previously agreed commission-payment terms.
Answer: Use a compliant written brokerage-agreement amendment signed by its parties, not the purchase amendment.
An extension notice uses a right already in the contract
A binding contract gives the buyer one five-day extension upon written notice received before a stated deadline. The buyer gives a notice that meets the clause's requirements, and no other limitation applies.
- The parties already granted the specific extension right.
- The notice exercises that right rather than proposing a new one.
- A different or longer extension would need its own contractual or legal basis.
Answer: This is exercise of the existing clause, not necessarily a new amendment requiring a fresh bargain. The actual clause controls.
Mistakes to avoid
- Addenda are always signed before the main contract. That is a common teaching distinction, not a universal naming rule. A later Addendum can modify an existing contract.
- Any request for a different term is a counteroffer. A tentative inquiry is not necessarily a rejection or a new offer. Read whether the response insists on the changed term.
- A proposed amendment cancels the original agreement. A request does not automatically change or terminate the contract. Check any attorney-review, termination, deadline or other applicable clause.
- Every attachment has to carry a separate signature. The adopted agreement and applicable formality control. Do not infer either automatic enforceability or automatic invalidity from a missing standalone signature block.
- A later signed page always wins. Check whether the writing was validly adopted, which term it changes and the agreement's priority language. Do not decide a genuine conflict from page order.
- The 24-hour clock waits for the final signer. The copy is due to the person who signed or initialed within 24 hours of that act, including a correction.
- An electronic signature cures missing consent. UETA recognizes the medium. Agreement, attribution, authority, complete terms and other substantive requirements remain. Preserve a version the recipient can retain when the applicable delivery rule requires it; a disappearing view is not automatically a true delivered copy.
- A broker can draft any amendment if the parties request it. A request does not expand legal-practice authority. The narrow Quinlan and Tyson preliminary-form role is not permission for custom legal drafting.
Check your understanding
These are original teaching questions, not recalled or predicted PSI questions. Answer first, then explain why the other choices fail.
1. The offer identifies and incorporates a financing page, and both parties accept the complete package. Which label best describes that supplemental page?
- Unauthorized alteration
- Novation
- Counteroffer
- Addendum
Show answer and explanation
Answer: D. Addendum
The page supplies part of the original accepted bargain. No later change to an existing contract or substitution/release of a party is stated. Incorporation and assent, not physical attachment alone, support the answer.
2. After a contract forms, the parties validly agree to replace its closing date. The later writing is titled Closing Addendum. What is its function?
- It is only a counteroffer because any changed date prevents formation
- It is only a disclosure receipt
- It is an amendment or modification of the existing agreement
- It is ineffective solely because the title is Addendum
Show answer and explanation
Answer: C. It is an amendment or modification of the existing agreement
The facts establish an existing contract and a validly agreed replacement term. The heading does not prevent the document from functioning as an amendment. The question assumes validity; it does not make every signed closing extension automatically enforceable.
3. Before accepting a $315,000 offer, a seller states: I will sell only for $325,000. No special option rule applies. What is this response?
- Acceptance of the original offer
- Amendment of a binding $315,000 contract
- Exercise of an existing extension clause
- Counteroffer
Show answer and explanation
Answer: D. Counteroffer
The seller insists on a materially different price before acceptance, so the response is a counteroffer. It is not assent to the original price or a change to a contract that already exists.
4. An offeree asks, Would you consider closing a week later? I am still considering your original offer. What should you avoid assuming?
- That the original offer remains subject to its own expiry and revocation rules
- That the actual words and circumstances matter
- That any discussion of another date necessarily rejects the original offer
- That this may be only an inquiry
Show answer and explanation
Answer: C. That any discussion of another date necessarily rejects the original offer
A tentative inquiry does not necessarily insist on a different bargain. Patel v. McGrath discusses the distinction between a suggested modification and a demand or rejection. The stated inquiry is not automatically a counteroffer; it also does not freeze the original offer indefinitely.
5. A licensee increases a credit in a signed transaction document after receiving only the buyer's verbal approval. The seller has not agreed. Which response fits Rule 1450.775(b)?
- Sending the edited page to the lender supplies consent
- Do not make or process that alteration without the required all-signatory written consent or direction and contemporaneous signatures or initials for the change
- The rule applies only if closing already occurred
- The change is permitted because the buyer requested it
Show answer and explanation
Answer: B. Do not make or process that alteration without the required all-signatory written consent or direction and contemporaneous signatures or initials for the change
The rule addresses signed documents. It requires written consent or direction from all signatories and bars processing an altered signed document unless each change is signed or initialed by all signatories at the time of the change. One person's verbal approval and lender delivery do not meet it. This handling duty applies to a signed transaction document even when the offer has not yet become a binding contract.
6. A buyer signs a corrected amendment at 2 p.m. Friday. Another party plans to sign Monday. When is that buyer's true copy due under Rule 1450.775(c)?
- Within 24 hours of the buyer's act, by 2 p.m. Saturday
- The next business day after closing
- Monday after the final signature
- Only after the buyer asks
Show answer and explanation
Answer: A. Within 24 hours of the buyer's act, by 2 p.m. Saturday
The clock runs from that person's signing or initialing of the original or correction. It does not wait for another person or convert the period into business hours. Deliver the version the buyer actually adopted.
7. Buyer and seller sign a purchase amendment purporting to change previously agreed payment terms in a separate buyer-broker agreement. Which Illinois rule is relevant?
- The newest buyer-seller document always binds the broker
- A brokerage agreement can be changed only orally
- A signature by the seller replaces the sponsoring broker's agreement
- Rule 1450.770 requires the proper written signed brokerage change and prohibits using real estate contract forms to change previously agreed commission-payment terms
Show answer and explanation
Answer: D. Rule 1450.770 requires the proper written signed brokerage change and prohibits using real estate contract forms to change previously agreed commission-payment terms
Subsections (j) and (k) address the brokerage agreement and the prohibited real estate contract-form workaround. Identify the parties to the fee agreement; buyer-seller signatures do not by themselves amend the broker-client bargain.
Common questions
What is the difference between an addendum and an amendment in real estate?
An addendum supplies supplemental terms, often incorporated when the original bargain is made. An amendment modifies an existing contract. The names overlap in actual forms. First ask whether a contract exists and what the document does; then check whether the parties validly adopted it.
Can an addendum be signed after the contract?
Yes. A later document titled Addendum can operate as a modification if it changes an existing agreement. Its heading does not avoid the requirements for assent, authority, consideration where required, and the applicable writing and signature rules.
Is a counteroffer the same as an amendment?
No. Under the ordinary offer rule, a response insisting on a different material term before acceptance is a counteroffer. An amendment changes a contract that already exists. A tentative inquiry about another term need not be a counteroffer. An existing contract's attorney-review clause can require a more specific analysis.
Does an inspection repair request cancel the purchase contract?
Not merely because it requests different performance. Read the inspection, attorney-review, termination, notice and deadline provisions and the actual communication. A proposal does not automatically become an accepted amendment, and it does not automatically eliminate a contract. Patel v. McGrath illustrates why the particular attorney-review language and correspondence matter.
Does every addendum need separate signatures?
Do not apply a universal rule from the label. Check whether the main agreement incorporates the identified document, whether the parties adopted the complete terms and what the particular form and applicable law require. Illinois licensees must also meet Rule 1450.775 when handling changes to already signed documents.
Who must agree to a contract amendment?
The required parties or their authorized representatives must assent to the modification. One broker cannot rewrite the bargain for them. For Illinois licensee handling of a signed transaction document, Rule 1450.775(b) specifically requires written consent or direction from all signatories and contemporaneous signing or initialing of each change by all signatories.
Does an Illinois real estate amendment have to be in writing?
Use a properly adopted written, signed amendment and check the contract's change clause. The land-contract writing and signature requirements in 740 ILCS 80/2, applicable modification law and Illinois licensee document rules all matter. Possible litigation doctrines about waiver, reliance or oral changes are not permission for a licensee to bypass Rule 1450.775.
Does an amendment need new consideration?
Ross v. May Company states that an Illinois common-law modification needs the elements of a valid contract, including offer, acceptance and consideration. Consideration is the bargained exchange, which can include a new promise, performance or forbearance. Signatures alone do not create the exchange. The case concerned employment handbooks; its general contract rule is used here, not its employment-specific result.
Does an original addendum need a separate payment to be valid?
Not merely because it is a separate page. If the parties adopt it as part of the original bargain, consider the exchange supporting the combined agreement. Do not confuse that question with a later modification, for which the applicable consideration rule must be tested. Neither a separate payment nor a separate signature block automatically settles enforceability.
Can a real estate contract be amended electronically in Illinois?
When UETA applies and the parties agree to conduct the transaction electronically, qualifying electronic records and signatures can satisfy writing and signature requirements. Check attribution, authority and the adopted terms. A delivered electronic record must meet applicable retention and delivery requirements. A typed name or email message does not automatically prove a completed amendment.
Does an amendment always override the original contract?
A valid amendment changes the terms it actually addresses. The rest of the agreement ordinarily continues subject to the adopted wording. Read any conflict or priority clause and the complete contract set. A newer attachment that was never agreed to does not automatically displace an earlier binding term.
Can a purchase amendment change the broker's commission?
Illinois Rule 1450.770(j) requires written brokerage agreements to provide that changes to commission amount or payment timing are binding only when written and signed by the parties. Subsection (k) prohibits a licensee from using real estate contract forms to change previously agreed commission-payment terms. Use the proper broker-client agreement and obtain its required parties' assent.
Can a broker prepare any custom amendment the parties want?
No. The task must stay within lawful authority. Quinlan and Tyson allows a narrow factual role in the customary preliminary offer or earnest-money form; it does not authorize custom legal provisions, deeds, mortgages or legal advice merely because a client asks or no separate fee is charged. Refer drafting that requires legal skill to an appropriately authorized lawyer.
Can an Illinois licensee use a form called Offer to Purchase for a binding contract?
Rule 1450.775(d) requires forms intended to become binding real estate contracts to say so clearly in a large, bold heading. It prohibits a licensee from using a form designated Offer to Purchase when it is intended to become a binding real estate contract. The narrow factual-form role discussed in Quinlan and Tyson does not remove this separate current form-labeling requirement.
Are these official PSI questions?
No. These are seven original teaching scenarios aligned with the national Contracts topic and relevant Illinois document rules, reviewed October 24, 2026. They are not recalled or predicted PSI items, a comprehensive contract-law examination or a validated measure of readiness.
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Official sources and scope
Reviewed October 24, 2026. Illinois provisions and court opinions support the state-specific rules. Ross concerns employment handbooks and supplies the general modification principle, not a decision approving a particular real estate amendment. Patel concerns its own attorney-review clause; its contractual deadlines are not universal Illinois deadlines. The California reference is used only for national offer vocabulary, not California law as an Illinois rule. The Quinlan source is a reproduction of the majority opinion, not a publisher's summary. Examples teach classification and do not approve a transaction form. Rule 1450.775's current form-labeling requirement remains separate from the older court decision's description of the preliminary form.
- PSI Illinois booklet, June 24, 2026: national V, Contracts
- 68 Ill. Adm. Code 1450.775(a)-(d): signed documents, alterations, 24-hour copies and binding-contract headings
- 68 Ill. Adm. Code 1450.770(j)-(k), July 13, 2026: brokerage commission changes
- Ross v. May Company, No. 1-06-0239 (2007), pages 6-10: modification and consideration
- Patel v. McGrath, No. 2-06-0472 (2007), pages 4-8: requests, counteroffers and the specific attorney-review clause
- 740 ILCS 80/2: land-contract writing and signature requirements
- 815 ILCS 333/3, /5, /7, /8 and /9: UETA scope, electronic agreement, recognition, retention and attribution
- Quinlan and Tyson, 34 Ill. 2d 116 (1966), majority pages 120-123: narrow preliminary-form role; opinion reproduced by Justia
- California DRE Reference Book, chapter 6, printed pages 91-92: general offer, counteroffer and inquiry vocabulary only
This is exam preparation, not advice for a specific transaction. State law and the applicable facts control. Our editorial and corrections process explains how to report an issue.