Can an addendum be signed electronically?

Yes. Electronic signatures meet U.S. legal standards under the ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted, provided the parties demonstrate intent, consent, attribution, and retention capability.

Do I need a notary for an addendum?

Not usually for commercial amendments, but state or contract-specific clauses may require notarization. If the base contract or local law requires acknowledgment, follow state rules for notarization.

What if the signer lacks authority?

If a signer is unauthorized, the addendum may be voidable. Confirm corporate authority or a written delegation; consider adding a representation of authority clause to avoid disputes.

How should I reference the original contract?

Identify the original agreement by full name and effective date and specify the exact sections amended. Attach a copy or cite exhibit numbers to avoid misidentification.

Are electronic records admissible in court?

Yes. Under ESIGN (15 U.S.C. ch. 96) and UETA, properly authenticated electronic records and signatures are admissible if they meet legal validity tests for intent and integrity.

How to correct a signed addendum with errors?

Do not alter a signed document. Prepare a subsequent corrective addendum signed by all parties referencing the erroneous addendum and stating the correction explicitly.

Electronic Signature
Templates
Sales
Sales Supply Agreement Addendum

Sales Supply Agreement Addendum

This template is fully customizable. Edit the text, fill out the fields, and send it for signature. Give it a try!

SALES SUPPLY AGREEMENT ADDENDUM

Parties and Background

This Addendum is made effective as of and amends the Sales Supply Agreement dated (the "Agreement") by and between the parties identified below.

Seller Name: Seller Address for Notices: Seller Contact: Buyer Name: Buyer Address for Notices: Buyer Contact:

Amendment Scope

Pursuant to Section(s) identified herein, the parties hereby agree to amend the Agreement as set forth in this Addendum. This Addendum supersedes only those provisions expressly modified below and leaves all other terms of the Agreement in full force and effect.

Products and Quantities

The Seller will supply the following items under the amended terms:

Item	Description	Quantity	Unit Price	Total

Subtotal: Taxes (specify): Shipping & Handling: Total Amount Due:

Payment Terms

Payment shall be made in accordance with the Agreement except as modified below. Invoices issued under this Addendum are payable within days from invoice date. Accepted payment methods (check all that apply): Check Wire/ACH Card Other

Late payments shall accrue interest at a rate of after a grace period of days from the invoice due date. In addition, Seller may suspend deliveries for undisputed overdue amounts upon seven (7) days written notice.

Delivery and Risk of Loss

Delivery shall be made by on or about , subject to production and shipping lead times. Risk of loss transfers to Buyer upon unless otherwise agreed in writing.

Warranty

Seller warrants that supplied products will conform to the agreed specifications and be free from material defects in workmanship and materials for a period of from date of delivery. Remedies for breach of warranty are limited to repair, replacement, or refund at Seller's option. Warranty exclusions include wear from normal use, misuse, alteration, or unauthorized repair.

Warranty Exclusions/Clarifications:

Returns and Refunds

Returns require prior written authorization from Seller. Authorized returns must be returned in original packaging within days of delivery. Restocking fee (if any): . Shipping costs for non‑defective returns are the responsibility of Buyer unless otherwise agreed.

Limitation of Liability

Except for liability arising from gross negligence or willful misconduct, neither party shall be liable to the other for indirect, incidental, special, or consequential damages, including lost profits, arising out of or in connection with this Addendum. Aggregated direct liability of the Seller under this Addendum shall not exceed the total amounts paid by Buyer to Seller under this Addendum for the affected goods.

Confidentiality

Each party agrees to hold in confidence and not disclose to any third party any confidential information received under or in connection with this Addendum, except as required by law. Confidential information shall not include information that is publicly available or rightfully received from a third party without breach of any obligation of confidentiality.

Governing Law and Dispute Resolution

This Addendum shall be governed by and construed in accordance with the laws of the State of without regard to conflict of law principles. Any dispute arising out of or relating to this Addendum shall be resolved in accordance with the dispute resolution provisions of the Agreement, except as expressly modified herein.

Additional Amendments, Special Instructions, or Clarifications:

Notices

All notices required or permitted under this Addendum shall be in writing and delivered to the addresses set forth above or such other address as a party designates by written notice to the other party.

Seller Billing / Remittance Address: Buyer Billing / Remittance Address:

Except as modified by this Addendum, all other terms and conditions of the Agreement remain unchanged and in full force and effect. In the event of any conflict between the terms of the Agreement and this Addendum, the terms of this Addendum shall control.

Seller (Printed Name):

By:

Date:

Buyer (Printed Name):

By:

Date:

What a Sales Supply Agreement Addendum Is and When It Applies

A Sales Supply Agreement Addendum is a written amendment that modifies specific terms of an existing sales or supply contract without replacing the original agreement. It records agreed changes such as pricing adjustments, delivery schedules, payment terms, scope expansions, or new compliance obligations. Properly drafted addenda reference the original contract, identify affected sections, state the effective date of the changes, and are signed by authorized representatives. When executed correctly, an addendum preserves the underlying contract while documenting negotiated changes in a clear, enforceable format.

Why Use an Addendum Instead of a New Contract

An addendum lets parties change limited terms quickly while keeping the original contract intact. It reduces negotiation overhead, preserves prior negotiated protections, and provides a focused record of amendments that courts and auditors can review alongside the base agreement.

Who Typically Prepares or Signs This Addendum

Ensure the person signing has authority under the main agreement and that the addendum explicitly references the original contract by date and title.

Procurement teams and contract managers who negotiate delivery schedules and prices.
Sales or account managers who finalize updated commercial terms with customers.
Legal or compliance staff who add regulatory obligations or data-handling clauses.

Step-by-Step: Executing an Addendum

Follow a short, repeatable process to ensure the addendum is valid and enforceable.

01

Identify Change: Pinpoint the exact clause or schedule to amend.
02

Draft Amendment: Draft clear replacement language or strike-throughs.
03

Review Internally: Have legal and finance review revised terms.
04

Execute & Distribute: Obtain authorized signatures and distribute final copies.

Essential Components to Include in the Addendum

A professional addendum is concise but precise: reference the original contract, state changes, include effective dates, and secure proper authority and signatures.

Reference Clause

Cite the original agreement title and date so the addendum unambiguously amends that specific contract and not another agreement.

Scope of Change

Define which sections, exhibits, or schedules are altered and whether other provisions remain unchanged and in full force.

New Terms

Insert exact replacement language or numeric adjustments (prices, quantities, delivery windows) to eliminate interpretive gaps.

Effective Date

State the precise date when the amendment takes effect and whether it applies retroactively or prospectively.

Signatory Authority

Include signer names, titles, and a statement confirming they are authorized under the original agreement to bind their party.

Attachment List

Attach any revised exhibits, SOWs, or technical specifications and identify them by exhibit number or name.

Security, Compliance, and Record Integrity

Encryption in Transit: TLS 1.2/1.3

Encryption at Rest: AES-256

Federal eSign Laws: ESIGN and UETA compliant

Industry Certifications: SOC 2 Type II, ISO 27001

Healthcare Controls: HIPAA (BAA required)

Regulated Records: 21 CFR Part 11 support

Key Risks from a Poorly Drafted Addendum

Ambiguous Terms: Disputes and litigation

Unauthorized Signature: Contract may be voidable

Missing Effective Date: Conflicting obligations

Inconsistent Exhibits: Operational delays

Failure to Notify: Breach claims

Regulatory Noncompliance: Fines or enforcement

Typical Digital Signing and Routing Flow

Use a predictable routing workflow to ensure each party reviews and signs in the correct order.

Upload Document: Place addendum and attachments in a single file.
Assign Signers: Add signer emails and roles in sequence.
Authenticate: Choose required authentication strength per risk.
Record Audit: Capture timestamps, IPs, and completion certificate.

Configuring an Online Addendum Workflow

Set up fields, authentication, and integrations before sending to reduce back-and-forth and ensure compliance.

Field	Setting
Signature Fields	Signature \| Required with date
Authentication	Email link \| SMS code or KBA optional
Reminders	Automatic \| 3 reminders typical
Integrations	CRM \| Salesforce, NetSuite, Microsoft 365

eSignature Vendor Comparison for Executing Addenda

Compare baseline pricing and core features relevant to contract addendum workflows; signNow appears first for reference.

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
Starting Price	$8/user/mo	$15/user/mo	$14/user/mo	$19/user/mo	$15/user/mo
Free Trial	7-day free trial	No trial	No trial	Yes, trial	Yes, trial
Bulk Send	Yes	Yes	Yes	Yes	No
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes	Yes	Yes	No	No
Envelope Cap	No cap	100 envelopes/user/year	Varies by plan	Varies	Varies

Practical Tips to Reduce Risk and Delay

Follow these practical recommendations to keep addenda enforceable and operationally effective.

Reference the Original Agreement

Always cite the original agreement title, effective date, and section numbers so the amendment ties directly to the intended contract and avoids ambiguity.

Use Clear, Specific Language

Replace or add exact language and numeric values rather than vague phrasing like 'reasonable' or 'as agreed' to limit disputes.

Confirm Signatory Authority

Verify signers have actual authority per the base agreement or corporate resolution; consider including a representation of authority clause.

Keep Version Control

Label each addendum with a version or amendment number and store it with the original contract to preserve an audit trail.

Common Questions and Practical Answers

Answers below address typical execution, enforceability, and technical questions when creating or signing a Sales Supply Agreement Addendum.

Need help? Contact support

Can an addendum be signed electronically?
Yes. Electronic signatures meet U.S. legal standards under the ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted, provided the parties demonstrate intent, consent, attribution, and retention capability.
Do I need a notary for an addendum?
Not usually for commercial amendments, but state or contract-specific clauses may require notarization. If the base contract or local law requires acknowledgment, follow state rules for notarization.
What if the signer lacks authority?
If a signer is unauthorized, the addendum may be voidable. Confirm corporate authority or a written delegation; consider adding a representation of authority clause to avoid disputes.
How should I reference the original contract?
Identify the original agreement by full name and effective date and specify the exact sections amended. Attach a copy or cite exhibit numbers to avoid misidentification.
Are electronic records admissible in court?
Yes. Under ESIGN (15 U.S.C. ch. 96) and UETA, properly authenticated electronic records and signatures are admissible if they meet legal validity tests for intent and integrity.
How to correct a signed addendum with errors?
Do not alter a signed document. Prepare a subsequent corrective addendum signed by all parties referencing the erroneous addendum and stating the correction explicitly.

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