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Joinder Agreement Form

All states
4.5 (5 reviews)
Updated Jan 19, 2024
~ 2 pages
A joinder agreement form is an essential legal document when a new party is added to an existing contract. This form ensures that everyone's interests are protected, the original contract stays the same, and all legal obligations are met, allowing for flexible and adaptable business collaborations. Download this free joinder agreement form from Lawrina and fill it out with our guidelines in minutes.
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A joinder agreement form is an essential legal document when a new party is added to an existing contract. It is commonly used when a new participant is needed in a contract already in effect. A joinder agreement form ensures that everyone's interests are protected, the original contract stays the same, and all legal obligations are met, allowing for flexible and adaptable business collaborations.

You may find a free customizable joinder agreement template on Lawrina to make sure your document meets legal requirements and serves its intended purpose effectively.

When to Use a Joinder Agreement

Joinder agreements are frequently employed in various business and legal situations. Key examples include:

  1. Investments: When new investors put capital into a company, they typically agree to the terms of the original investment agreement via a joinder agreement. 
  2. Mergers and Acquisitions: Joinder agreements are often used for M&A transactions to bind new entities to existing agreements.
  3. Multi-party Agreements: In agreements like consortiums or alliances where multiple parties are involved, a joinder agreement can be an efficient way to bring in new members. 
  4. Real Estate: In real estate, if a co-owner is added to a property, a joinder agreement might be used to bind the new co-owner to the terms of the original mortgage or lease agreement.


  • Original Contract Holder: This is the individual or entity that initially agreed. They have accepted the rights and responsibilities outlined in the contract. When there is a need to extend certain obligations or benefits to a new party, the original contract holder initiates a joinder agreement. They also have the authority to enforce the terms of the existing contract with the new party.

  • Joining Entity: This entity refers to any person, group, or organization that willingly enters an existing agreement through a joinder agreement. The joining entity agrees to fulfill specific obligations or receive certain benefits outlined in the joinder agreement and the underlying contract. As the joining entity, they must follow the contract terms and promise to fulfill all contractual obligations. Not meeting these obligations can result in legal consequences, like breaching the original contract.

Key Terms

  1. Original agreement: This is the pre-existing contract that remains in place before the joinder agreement occurs. It specifies the initial obligations, conditions, and rights the new party will adapt or gain.

  2. Joining party: The joining party is the new entity or individual that consents to become a part of an existing contract via a joinder agreement. They assume the privileges and duties outlined in the original agreement.

  3. Original parties: Original parties are entities or individuals that constituted the initial agreement before the joinder agreement was enacted. The original parties are typically responsible for validating the addition of the new party and accepting any alterations to their contractual duties.

  4. Terms and conditions: Terms and conditions are the guidelines and stipulations detailed in the original agreement. They can encompass many aspects, from breach penalties and payment plans to usage rights and obligatory confidentiality practices. The joining party must comply with these stipulations upon the effective date.

  5. Effective date: This denotes when the joining party will formally assume a part of the original agreement. The effective date is crucial for defining the duration of the contract, the commencement of obligations, and comprehending when their rights and duties take effect.

How to Write a Joinder Agreement

To draft an effective joinder agreement form, follow these key stages:

  1. Identify the Original Agreement:
    Begin by clearly identifying the original agreement that the joining party will be entering into. Include all pertinent details, such as the agreement's name and the date it was initially executed.

  2. Specify the Joining Party:
    Mention the joining party, including their legal entity name and address. Ensure all key details are recognized to avoid any legal ambiguities.

  3. Outline the Terms and Conditions:
    Recognize the terms and conditions of the original agreement that will now apply to the joining party. Ensure these are consistent with the original deal and clarify that they will bind the joining party.

  4. Determine the Effective Date:
    Specify when the joinder agreement will become effective. This is the day when the joining party's rights and obligations under the original contract officially commence.

  5. Signatures:
    Lastly, ensure all parties, including the joining party, sign the joinder agreement form. This substantiates the agreement legally and symbolizes each party's agreement to uphold the identified terms.

A joinder agreement meaning is that this essential legal document allows the inclusion of a participating party into an existing contract. Its primary purpose is to expand the contractual terms, conditions, and responsibilities of the original agreement to this newly added entity. By signing the joinder agreement, the third party agrees to abide by the contract terms, promoting a transparent and responsible involvement within the contractual framework.

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