The C.A.R. Form AOAA, or Assignment of Agreement Addendum, is the California Association of REALTORS® form used to add a buyer, remove a buyer, or fully reassign the buyer’s side of an existing Residential Purchase Agreement. To complete it, you match the original RPA’s identifying details exactly, specify which type of assignment you’re making, identify the parties coming in or going out, and collect signatures from every buyer, every seller, and anyone being added or removed before delivering the signed addendum to escrow, the lender, and the agents.
When the AOAA Is the Right Form
Three situations call for it. The first is a partial assignment that adds a buyer to a contract that’s already been accepted. A couple who signed with only one name on the RPA might decide both should be on title; a parent might join to strengthen the loan file. The new person becomes a party to the existing contract instead of writing a fresh offer.
The second is removing a buyer. If a co-buyer can’t qualify, backs out, or steps aside, the AOAA documents the departure and the remaining buyer continues under the same terms.
The third and rarest is a total assignment, in which the original buyer transfers the entire agreement to a different person and drops out completely. Any assignment requires the seller’s agreement; the AOAA doesn’t override the seller’s right to choose who they’re doing business with.1California Association of REALTORS. California Residential Purchase Agreement and Joint Escrow Instructions
What to Gather First
Before opening the form, pull together:
- The date of the accepted RPA, the property address, and the escrow or transaction number.
- Every current buyer name, spelled exactly as it appears on the RPA.
- The full legal name of anyone being added, or clear identification of anyone being removed.
- Every seller name from the existing contract.
Agents pull the current AOAA through C.A.R.’s zipForm platform, which stays current with the revision approved by C.A.R.’s Legal Department.2California Association of REALTORS. California Association of REALTORS List of Standard Forms The form is proprietary to C.A.R. members, so buyers and sellers working with a REALTOR® will have their agent prepare it.
Filling Out the Form
Start with the identifying information that ties the addendum to the original agreement: property address, date of the original RPA, and the names of all current buyers and sellers. These fields must match the original contract exactly. Even a minor spelling difference can create title issues later.
Then select the type of assignment. For a partial assignment adding a buyer, identify the new party by full legal name and specify that the original buyer remains on the agreement. For a removal, identify which person is being deleted. For a total assignment, name both the departing buyer and the replacement. In every case, the form should make clear whether the original buyer keeps any rights or obligations under the contract or is being released entirely.
The current C.A.R. Residential Purchase Agreement was most recently revised in December 2024, so confirm your AOAA version is compatible with the RPA version your transaction uses.2California Association of REALTORS. California Association of REALTORS List of Standard Forms Using a mismatched revision can raise enforceability questions if paragraph numbering has shifted between versions.
Signatures and Delivery
Every party to the transaction has to sign: the seller, the original buyer, and any buyer being added or removed. A total assignment needs the departing buyer’s signature and the incoming buyer’s. Without all signatures, the assignment is incomplete and escrow won’t process the change.
Most agents execute through electronic signature platforms integrated with zipForm. Paper signatures work, but electronic execution is faster and creates a timestamped record that escrow officers and lenders prefer. Once fully signed, deliver the AOAA to escrow, the lender if financing is involved, and all agents. It then becomes a permanent addendum to the escrow file.
What the AOAA Changes and What It Doesn’t
The AOAA changes who is buying. It does not change the purchase price, contingency deadlines, or any other financial term in the original RPA. But the buyer change usually affects loan qualification, and the lender will need to underwrite the new or modified borrower separately. Adding a buyer with weaker credit can delay closing. Removing a buyer who was the primary wage earner can kill the loan entirely. Talk to the loan officer before executing the AOAA so you know whether the change is survivable.
Title and vesting are also affected. When a new buyer is added, escrow needs updated vesting instructions specifying how the parties will hold title, whether as joint tenants, tenants in common, community property, or another form. The AOAA itself doesn’t dictate vesting; a separate vesting instruction or amendment handles how ownership is structured.
Seller Consent Is Not Optional
Sellers sometimes resist signing an AOAA because they worry the replacement or additional buyer is less creditworthy than the original. That concern is legitimate and the seller can refuse. A buyer cannot unilaterally assign the purchase agreement; the C.A.R. RPA requires seller consent.1California Association of REALTORS. California Residential Purchase Agreement and Joint Escrow Instructions If the seller refuses, the original contract stays in force with the original buyer, and the buyer’s options are to proceed under the existing terms or negotiate.
From the seller’s side, reviewing the new buyer’s proof of funds or pre-approval letter before signing is a reasonable precaution. A listing agent should ask for updated financial documentation before recommending the seller execute the addendum.
Common Mistakes
The most frequent error is treating the AOAA as optional when adding a name. Agents sometimes skip the addendum and simply update the title company’s records, which creates a mismatch between the purchase agreement and the title documents. If a dispute arises, the purchase agreement controls, and a buyer whose name isn’t on it has a much harder time asserting rights.
Timing is the next problem. Submitting the AOAA late in escrow can delay closing because the lender has to re-underwrite the loan with the updated borrower information. If you know a buyer change is coming, execute the AOAA as early as possible. Dropping it on the lender a week before closing invites an extension request or a blown deadline.
Finally, distribute the signed AOAA to everyone who needs it: both agents, the escrow officer, the title company, and the lender. A signed addendum sitting in one agent’s inbox does nothing until the people who need to act on it have it in hand.