Can an annex be signed electronically?

Yes. Electronic signatures are legally valid under the ESIGN Act (15 U.S.C. §7001) and UETA in adopted states, provided intent, consent, attribution, and record retention requirements are met.

What if the annex differs from the master agreement?

Annex terms operate alongside the master agreement; expressly reference the master agreement and specify which provisions are superseded to avoid conflicts.

Who must sign the annex to make it binding?

An authorized signer identified in the master agreement or by corporate delegation must sign. Verify board or officer approvals when required under formation documents.

Is notarization ever required for an annex?

Not typically for service-only annexes, but notarization may be required where the annex affects real property or statutory forms; check state-specific notary rules.

How should I store executed annexes?

Store signed PDFs plus an immutable audit trail for at least the retention period; ensure encryption at rest and access controls are in place.

What happens if a signer’s name does not match official records?

Name mismatches can create enforceability issues. Correct or add an attestation verifying the signer’s authority and identity; consider notarization if identity is contested.

Electronic Signature
Templates
Legal
Annex to Professional Services Agreement

Annex to Professional Services Agreement

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

ANNEX TO PROFESSIONAL SERVICES AGREEMENT

This Annex No. (the "Annex"), effective as of , supplements the Professional Services Agreement dated between Client Name: with Address: and Service Provider Name: with Address: .

RECITALS

WHEREAS, the parties entered into the Professional Services Agreement identified above (the "Agreement") to set forth the terms under which Service Provider will perform certain services; and

WHEREAS, the parties desire to amend and supplement the Agreement to define additional services, deliverables, fees and administrative procedures specific to the projects described in this Annex; and

WHEREAS, capitalized terms used but not defined in this Annex shall have the meanings set forth in the Agreement.

NOW, THEREFORE, in consideration of the mutual covenants contained herein and other good and valuable consideration, the receipt and sufficiency of which are acknowledged, the parties agree as follows:

1. SCOPE OF SERVICES

1.1 Services. Service Provider shall provide the services described in Schedule A attached hereto (the "Services"). The Services include, without limitation, the tasks, milestones and deliverables set forth in Schedule A and any Change Orders agreed under Section 4 of this Annex.

Schedule A — Description of Services

2. TERM

2.1 Term. The term of this Annex shall commence on and shall continue until unless earlier terminated in accordance with Section 10 of the Agreement or Section 9 of this Annex.

3. FEES AND PAYMENT

3.1 Fees. Client shall pay Service Provider the fees set forth in Schedule B (the "Fees"). All Fees are payable in U.S. dollars unless otherwise stated.

Schedule B — Fee Table (summarize rates and milestones)

3.2 Expenses. Client will reimburse Service Provider for reasonable, pre-approved out-of-pocket expenses incurred in the performance of the Services. Reimbursement shall be made upon submission of receipts and documentation.

3.3 Payment Terms. Unless otherwise agreed in Schedule B, invoices are due net days from invoice date. Late payments shall accrue interest at the lesser of 1.5% per month or the maximum rate permitted by law.

4. CHANGE ORDERS

4.1 Any material changes to the scope, schedule or Fees shall be effected only by written Change Order signed by authorized representatives of both parties. A Change Order shall describe the change, the effect on Fees and schedule, and any other reasonable adjustments.

Change Order Procedure

5. CONFIDENTIALITY

5.1 Confidential Information. The parties acknowledge that each may have access to Confidential Information of the other. Each party shall protect and use Confidential Information in accordance with the confidentiality provisions of the Agreement. In the event of any conflict between this Annex and the Agreement with respect to confidentiality, the Agreement shall govern unless this Annex expressly amends the Agreement in writing.

6. INTELLECTUAL PROPERTY

6.1 Ownership. Unless otherwise set forth in Schedule C, Service Provider hereby assigns to Client all right, title and interest in and to Deliverables created specifically for Client under this Annex, subject to Client's payment in full of Fees due for such Deliverables. Provider retains ownership of Provider Background Technology, and grants Client a non-exclusive license to the extent necessary to use the Deliverables.

Schedule C — Intellectual Property Provisions (if different from Agreement)

7. REPRESENTATIONS AND WARRANTIES

7.1 Mutual Representations. Each party represents that it has the full right, power and authority to enter into and perform this Annex and that the execution and delivery hereof has been duly authorized.

7.2 Provider Warranties. Service Provider warrants that the Services will be performed in a professional and workmanlike manner consistent with generally accepted industry standards. Client's sole and exclusive remedy for breach of this warranty shall be re-performance of the nonconforming Services or, if re-performance is not commercially feasible, refund of Fees paid for the nonconforming Services.

8. INDEMNIFICATION

8.1 Indemnification. Each party shall indemnify, defend and hold harmless the other party from and against any third-party claims, damages, losses or expenses arising out of the indemnifying party's gross negligence, willful misconduct, or material breach of this Annex, subject to the limitations and procedures set forth in the Agreement.

9. LIMITATION OF LIABILITY

9.1 Except with respect to liability arising from a party's gross negligence, willful misconduct, or indemnification obligations, neither party shall be liable for incidental, consequential, special or punitive damages. The aggregate liability of each party for claims arising out of or relating to this Annex shall not exceed or the total Fees paid under this Annex, whichever is greater.

10. TERMINATION

10.1 Termination for Convenience. Either party may terminate this Annex for convenience upon days' prior written notice to the other party, subject to payment for Services performed through the effective date of termination.

10.2 Effect of Termination. Upon termination, Service Provider shall deliver all completed Deliverables and Client shall pay all undisputed Fees and reimbursable expenses incurred through the effective date of termination.

11. NOTICES

11.1 All notices required or permitted under this Annex shall be in writing and shall be delivered to the addresses set forth below or to such other address as a party may designate by notice in accordance with this Section.

Client Notices Service Provider Notices

12. AMENDMENTS AND WAIVER

12.1 Amendments. This Annex may be amended only by a written instrument executed by authorized representatives of both parties. No oral statements or course of conduct shall modify this Annex.

12.2 Waiver. No failure or delay by either party in exercising any right shall operate as a waiver thereof, and no single or partial exercise of any right shall preclude further exercise of that or any other right.

13. COUNTERPARTS

13.1 This Annex may be executed in counterparts, each of which shall be deemed an original, and all of which together shall constitute one instrument. Signatures delivered by electronic means shall be binding.

14. GOVERNING LAW; SEVERABILITY; ENTIRE AGREEMENT

14.1 Governing Law. This Annex shall be governed by and construed in accordance with the laws of the state identified in the Agreement, without regard to conflict of law principles, except to the extent the Agreement specifies a different governing law.

14.2 Severability. If any provision of this Annex is held invalid or unenforceable, the remaining provisions shall remain in full force and effect to the fullest extent permitted by law.

14.3 Entire Agreement. This Annex, together with the Agreement and its Schedules, constitutes the entire agreement of the parties with respect to the subject matter hereof and supersedes all prior proposals, negotiations, representations or agreements, whether written or oral, relating to such subject matter.

15. MISCELLANEOUS

15.1 Relationship of Parties. The parties are independent contractors. Nothing in this Annex creates a partnership, joint venture, agency or employment relationship between the parties.

Additional Provisions (if any)

Client Printed Name:

By:

Date:

Service Provider Printed Name:

By:

Date:

What the Annex to Professional Services Agreement Is

An Annex to Professional Services Agreement is a supplemental document that amends, clarifies, or extends the terms of a primary professional services agreement. It typically details specific project deliverables, scope changes, fees, timelines, acceptance criteria, reporting requirements, and any temporary exceptions to the master agreement. Annexes are used to capture discrete work orders, change orders, or scope-limited tasks without rewriting the full contract. When signed by authorized parties, the annex becomes contractually binding and operates together with the main agreement to govern the relationship for the defined scope and period.

Why an Annex Can Be Useful for Managing Scope and Risk

An annex provides a focused, auditable way to record project-specific terms — schedules, deliverables, and compensation — while keeping the master agreement intact.

Who Typically Prepares and Signs an Annex

Organizations and individuals use annexes when adding or adjusting work under an existing services contract; common participants are shown below.

Consulting firms and independent contractors managing discrete projects or task orders, where each annex defines the specific engagement.
Enterprise procurement, project management, and legal teams that need traceable, auditable amendments without redrafting the entire master agreement.
Clients, subcontractors, and vendor account managers who accept clarified deliverables, schedules, or fee changes tied to a particular project.

Ensure the signer list matches who is authorized under the master agreement and confirm any required corporate approvals before execution.

Essential Components to Include in an Annex

A clear annex reduces disputes and speeds execution. Include tightly drafted elements that map to the master agreement and specify measurable outcomes.

Scope Description

Precisely describe tasks, deliverables, and exclusions so parties have a common, measurable expectation for performance and acceptance criteria.

Fees and Rates

Specify fixed fees, hourly rates, milestone payments, expense reimbursement rules, invoicing schedule, and payment terms to avoid later billing disputes.

Deliverables & Milestones

List deliverables, milestone dates, acceptance tests, and deliverable formats or templates that the client must approve or reject within defined review periods.

Term and Termination

State the effective date, expiration or renewal terms, and any early-termination rights or cure periods tied specifically to the annex scope.

Change Control

Define how scope changes are requested, approved, priced, and documented — reference the master agreement’s change-order procedure where applicable.

Confidentiality and IP

Clarify ownership or license rights for work product, any third-party materials, and continue confidentiality obligations consistent with the master agreement.

Required Information and Fields at a Glance

Parties' legal names: As on formation documents

Scope summary: Concise task description

Effective date: MM/DD/YYYY format

Compensation terms: Rates and schedule

Signatory title: Authorized signer role

Governing law: State selected

Step-by-Step: How to Prepare and Execute an Annex

Follow a consistent sequence to ensure legal and operational readiness before sending the annex for signature.

01

Draft: Create annex referencing master agreement clauses
02

Review: Legal and project teams verify scope and pricing
03

Authorize: Obtain internal approvals and confirm signer authority
04

Execute: Sign, record execution date, and distribute fully executed copies

Configuring an Online Annex Workflow

When setting up an eSignature workflow, choose authentication, field behavior, and storage options aligned with risk and compliance needs.

Field	Configuration
Authentication	Email link plus optional SMS code
Signature type	Electronic signature field (typed or drawn)
Conditional fields	Enable for optional scope sections
Storage	Save signed PDF and audit trail

Where to Send, File, or Submit an Executed Annex

Choose logical routing and retention destinations to align contract management, invoicing, and audit needs.

Primary recipient: Send signed copies to contracting party
Contract repository: Upload executed annex and audit trail
Accounts payable: Deliver invoice and payment schedule
Project team: Share deliverables and milestone dates

Digital Signing and eSubmission Considerations

Select eSignature settings that match the annex’s sensitivity and regulatory context.

Authentication: Email or SMS verification
Audit trail: Timestamp, IP, and signer history
Storage encryption: AES-256 at rest

Ensure the platform you use supports required compliance frameworks and provides retrievable audit records for enforcement or audits.

Key Dates, Notice Periods, and Timing to Track

Annexes introduce specific dates that drive performance, payment, termination rights, and acceptance; track them carefully.

Effective Date:

Date obligations commence; enter as MM/DD/YYYY

Notice periods:

Specify days for cure, termination, or claims

Payment due:

Net terms (e.g., Net 30) from invoice date

Acceptance window:

Client review period for deliverables

Record retention:

Preserve executed annex per policy

Common Mistakes to Avoid When Preparing an Annex

Using inconsistent party names with the master agreement, which creates enforceability uncertainty and administrative delay.
Failing to reference the master agreement or specific clause numbers, leaving interpretive gaps between documents.
Omitting clear acceptance criteria or deliverable formats, which leads to disputes over whether work was completed.
Skipping internal authorization steps and allowing an unsigned or unauthorized annex to be treated as binding.

Risks and Legal Consequences of an Incorrect Annex

Unenforceable terms: Missing signatures risk unenforceability

Payment disputes: Vague fee language creates collection risk

Scope creep: Poor change control causes cost overruns

Regulatory exposure: Noncompliance may breach industry rules

Confidentiality breach: Improper clauses risk data disclosure

Authority gaps: Unauthorized signer may void agreement

Comparing eSignature Vendor Pricing and Key Capabilities

Cost and capabilities vary by plan and vendor. The table below summarizes common decision criteria for executing annexes and similar contract amendments.

	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	Yes, 7-day trial	No	No	Yes, limited	Yes, limited
Bulk Send	Yes	Yes	Yes	Yes	No
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes	Yes	Yes	No	No

Frequently Asked Questions and Troubleshooting

Answers to common questions about execution, enforceability, and eSigning of an annex to a professional services agreement.

Need help? Contact support

Can an annex be signed electronically?
Yes. Electronic signatures are legally valid under the ESIGN Act (15 U.S.C. §7001) and UETA in adopted states, provided intent, consent, attribution, and record retention requirements are met.
What if the annex differs from the master agreement?
Annex terms operate alongside the master agreement; expressly reference the master agreement and specify which provisions are superseded to avoid conflicts.
Who must sign the annex to make it binding?
An authorized signer identified in the master agreement or by corporate delegation must sign. Verify board or officer approvals when required under formation documents.
Is notarization ever required for an annex?
Not typically for service-only annexes, but notarization may be required where the annex affects real property or statutory forms; check state-specific notary rules.
How should I store executed annexes?
Store signed PDFs plus an immutable audit trail for at least the retention period; ensure encryption at rest and access controls are in place.
What happens if a signer’s name does not match official records?
Name mismatches can create enforceability issues. Correct or add an attestation verifying the signer’s authority and identity; consider notarization if identity is contested.

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