Can an addendum be signed electronically?

Yes; electronic signatures are generally valid under the federal ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted. Confirm agency procurement rules and any industry-specific signature requirements before relying solely on e-signature evidence.

What if the addendum changes price or scope?

Document pricing adjustments clearly and require bidder acknowledgement. Significant changes may require bid extensions or re-evaluation to ensure equal opportunity and to avoid successful protests.

Who must sign the addendum to bind the issuer?

Only designated contracting officers or authorized signatories bind the issuing agency. Verify internal authority matrices before release to prevent unauthorized modifications and downstream disputes.

Is notarization ever required for an addendum?

Not typically for ordinary procurement amendments, but some agencies or local rules may require notarized affidavits or attestations for specific certifications; check agency solicitation instructions.

How should acknowledgement be collected and stored?

Collect signed acknowledgements or written confirmations and retain them with the procurement record. Electronic platforms should capture an audit trail including signer identity, IP, and timestamps.

Can an issuer revoke or replace an addendum?

Yes; an issuer may rescind or supersede an addendum by issuing a subsequent addendum that explicitly revokes prior versions. Record the revocation and redistribute to all bidders to maintain transparency.

Electronic Signature
Templates
Miscellaneous
Tender Proposal Addendum

Tender Proposal Addendum

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

TENDER PROPOSAL ADDENDUM

Addendum Number: Effective Date:

Original Tender No.: Project/Contract Title:

RECITALS

WHEREAS, Procuring Entity: issued a tender identified above for the Project described in the Original Tender Documents; and

WHEREAS, Bidder/Offeror: submitted a Proposal in response to the Original Tender Documents; and

WHEREAS, the Procuring Entity and Bidder wish to amend certain terms of the Proposal and the Original Tender Documents as set forth in this Addendum, which shall form part of and modify the Proposal and Original Tender Documents as specified below.

SCOPE OF AMENDMENT

Scope of Work Affected Detailed Amendments and Instructions

ADJUSTMENTS TO PRICE AND SCHEDULE

The Bid Price is adjusted as follows:

Revised Contract Price (if applicable)

The Project schedule is adjusted as follows:

New Completion Date (if applicable) Explanation of Price or Schedule Change

PAYMENT TERMS

Payment Amount Affected by This Addendum Payment Schedule / Milestones Late Payment Fee

TERM AND TERMINATION

This Addendum shall become effective on and shall remain in effect until , unless earlier terminated in accordance with the Original Tender Documents or upon written notice.

Notice Period for Termination

CONFIDENTIALITY

All information exchanged in connection with this Addendum that is designated confidential or that reasonably should be understood to be confidential given the nature of the information and the circumstances of disclosure shall be treated in accordance with the confidentiality provisions of the Original Tender Documents. Neither party shall disclose Confidential Information to any third party except to its employees, consultants, or subcontractors with a need to know and who are bound by confidentiality obligations no less restrictive than those herein. The obligations in this clause shall survive termination of this Addendum for a period of three (3) years.

GOVERNING LAW

This Addendum shall be governed by and construed in accordance with the laws of the jurisdiction of without regard to conflict of laws principles.

ENTIRE AGREEMENT

Except as expressly amended by this Addendum, all terms and conditions of the Original Tender Documents and the Bidder's Proposal remain in full force and effect. This Addendum, together with the Original Tender Documents and the Proposal (as amended), constitutes the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior oral or written agreements relating thereto.

ATTACHMENTS AND ACKNOWLEDGMENTS

The following documents are attached to and incorporated into this Addendum (check all that apply):

Revised Drawings Revised Specifications Cost Breakdown

Reason for Issuing Addendum

The parties acknowledge and agree that this Addendum shall modify only those provisions expressly set forth herein; all other terms of the Original Tender Documents not modified by this Addendum shall remain unchanged and in full force and effect.

Procuring Entity - Printed Name:

By (Signature):

Date:

Bidder / Offeror - Printed Name:

By (Signature):

Date:

What a Tender Proposal Addendum Is and When it’s Used

A Tender Proposal Addendum is a written amendment that changes, clarifies, or supplements an existing tender or proposal submission. Common uses include extending deadlines, revising scope, correcting specification errors, or updating pricing and deliverables. The addendum becomes part of the original tender package and must reference the original solicitation clearly, identify the authorized issuer, and be distributed to all prospective bidders or proposers to preserve fairness in the procurement process. When executed properly, it creates enforceable modifications to the original documents.

Why an Addendum Matters for Clear, Enforceable Procurement

A properly drafted addendum prevents bidder confusion, ensures consistent evaluation, and preserves the integrity of the procurement timeline and award process.

Who Prepares and Who Signs Tender Proposal Addenda

Typical creators and recipients include procurement officers, contract managers, vendors, and legal counsel involved in the solicitation.

Procurement teams and contracting officers responsible for issuing formal clarifications to all bidders.
Proposers and vendors who must acknowledge and incorporate the addendum into revised proposals or bids.
Legal and compliance staff who review language for regulatory or contractual risk and authorize changes.

Ensure each party named in the addendum has the authority to act and receives the same version to avoid disputes.

Step-by-step: Prepare and Issue an Addendum

Follow a consistent, auditable workflow from drafting through distribution and acknowledgement to reduce disputes and ensure timely supplier responses.

01

Draft: Reference the original solicitation and describe the specific change.
02

Review: Obtain internal legal and procurement approvals before release.
03

Publish: Distribute the addendum to all bidders using the official channels.
04

Acknowledge: Record or collect bidder acknowledgements and retain proof of receipt.

Core Sections to Include in a Professional Addendum

A robust addendum contains standardized headings and explicit cross-references so recipients can apply changes without reinterpreting the entire solicitation.

Header

Identify the issuing agency, solicitation number, and addendum number prominently to prevent misapplication of the amendment during proposal preparation or evaluation.

Scope Reference

Cite the exact sections, pages, or attachment identifiers being revised so proposers can quickly locate and replace the prior language in their submissions.

Revised Language

Present replacement clauses in full, not just redline notes, to reduce interpretation errors during bid evaluation and contract award.

Dates and Deadlines

State any changes to submission deadlines, pre-bid meeting times, or site visit windows with explicit time zones and date formats to avoid late bids.

Acknowledgement Instructions

Specify how proposers must acknowledge receipt — by signed form, confirmation email, or eSignature — and whether acknowledgement is mandatory for bid acceptance.

Authority and Contact

List the authorized contracting officer or buyer and a point of contact with phone/email for clarification; include the official approval signature and title.

Security and Compliance Essentials for Digital Addenda

Encryption in Transit: TLS 1.2/1.3

Encryption at Rest: AES-256

Audit Trail: IP, timestamps, action log

Federal eSign Laws: ESIGN and UETA compliant

HIPAA Support: BAA available

21 CFR Compliance: Part 11 capable

Typical Online Workflow Settings for an Addendum

When configuring an electronic workflow, choose authentication, field behavior, and retention settings that match procurement rules and audit expectations.

Field	Configuration
Authentication Method	Email link, SMS code, or KBA depending on required signer identity assurance
Conditional Fields	Show or hide sections when certain checkboxes or responses are selected to reduce signer errors
Template	Save standard addendum layout for reuse to speed issuance and maintain consistency
Audit Trail	Enable IP capture, timestamps, and signer actions for evidentiary record

Distribution Channels and Technical Requirements

Choose delivery channels that satisfy the solicitation terms and preserve an auditable record of distribution and acknowledgement.

Integrations: Salesforce, NetSuite, Microsoft 365
File Formats: PDF, DOCX, HTML supported
Authentication: Email OTP, SMS, SSO available

Confirm that chosen platforms meet agency security requirements and produce downloadable signed copies and full audit trails for the procurement file.

How Electronic Issuance and Acknowledgement Works

Electronic workflows mirror manual processes while adding recordability—follow the steps below to issue and capture acknowledgements consistently.

Prepare Document: Upload the addendum and apply clear reference fields.
Place Fields: Add signature, date, and acknowledgement fields for recipients.
Send to Signers: Distribute via official procurement contact list or secure links.
Archive Record: Store signed addenda and audit trail in the procurement record.

Key Timing Considerations and Typical Deadlines

Timely issuance and sufficient notice are essential; many procurement policies require a minimum notice window before closing to preserve fairness.

Issue Before Closing:

Best practice: publish addenda at least 72 hours before bid close when possible.

Acknowledge Deadline:

Set a clear deadline for proposer acknowledgement and incorporate it into bid evaluation if required.

Revised Submission Deadline:

If submissions are extended, state the new date/time and time zone explicitly.

Award Date Impact:

Note that significant changes can delay evaluation and award timelines.

Recordkeeping:

Retain addenda and proofs of distribution for procurement audit periods.

Typical Milestones from Draft to Acknowledgement

A concise milestone sequence helps coordinate internal approvals, external distribution, and bidder responses.

01

Draft Completed

Legal and procurement officials finalize amendment text.

02

Internal Approval

Authorized signer reviews and signs the document.

03

Public Release

Addendum is posted to official procurement channels and emailed to bidders.

04

Receipt Recorded

Acknowledgements collected and stored for evaluation.

Common Preparation and Distribution Errors to Avoid

Failing to cite the original solicitation or section numbers, creating ambiguity about which provisions are amended and leading to misapplied changes during evaluation.
Distributing different versions to different bidders or failing to publish the addendum on the official procurement portal, which can result in bid protests or disqualification.
Using vague or open-ended replacement language instead of explicit replacement clauses, which increases interpretation disputes and can slow evaluation.
Not recording acknowledgements or relying on informal confirmations, leaving the procuring entity without proof that all proposers received and accepted the change.

Consequences of Incorrect or Untimely Addenda

Bid Rejection: Submission may be invalid

Contract Voidance: Award may be rescinded

Debarment Risk: Serious misrepresentation consequences

Financial Liability: Costs from remediation or delay

Procurement Protest: Competing bidders may file challenges

Administrative Penalties: Sanctions per agency rules

Representative eSignature Pricing and Feature Comparison

Comparison of entry-level pricing and common procurement features across major eSignature providers; signNow appears first per vendor ordering rules.

	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	Varies by vendor	Varies by vendor	Varies by vendor	Varies by vendor
Bulk Send	Yes	Yes	Yes	Yes	Yes
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes (BAA required)	Varies by plan	Varies by plan	Varies by plan	Varies by plan
Envelope Cap	No cap	100 envelopes/user/year	Varies by plan	Varies by plan	Varies by plan

Frequently Asked Questions About Tender Proposal Addenda

Answers to common practical and legal questions encountered when drafting, issuing, and receiving addenda in U.S. procurements.

Need help? Contact support

Can an addendum be signed electronically?
Yes; electronic signatures are generally valid under the federal ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted. Confirm agency procurement rules and any industry-specific signature requirements before relying solely on e-signature evidence.
What if the addendum changes price or scope?
Document pricing adjustments clearly and require bidder acknowledgement. Significant changes may require bid extensions or re-evaluation to ensure equal opportunity and to avoid successful protests.
Who must sign the addendum to bind the issuer?
Only designated contracting officers or authorized signatories bind the issuing agency. Verify internal authority matrices before release to prevent unauthorized modifications and downstream disputes.
Is notarization ever required for an addendum?
Not typically for ordinary procurement amendments, but some agencies or local rules may require notarized affidavits or attestations for specific certifications; check agency solicitation instructions.
How should acknowledgement be collected and stored?
Collect signed acknowledgements or written confirmations and retain them with the procurement record. Electronic platforms should capture an audit trail including signer identity, IP, and timestamps.
Can an issuer revoke or replace an addendum?
Yes; an issuer may rescind or supersede an addendum by issuing a subsequent addendum that explicitly revokes prior versions. Record the revocation and redistribute to all bidders to maintain transparency.

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