Can the addendum be signed electronically?

Yes. Electronic signatures are legally enforceable for most transactions under the ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted. Ensure the signer demonstrates intent, consents to electronic records, attribution is clear, and the record can be retained.

When is notarization required?

Notarization is rarely required for a plain information addendum unless state law or the attachment to a specific instrument (deed, POA) requires it. Remote online notarization rules vary by state; verify local notary statutes before notarizing.

What if the TIN provided is incorrect?

An incorrect TIN can trigger backup withholding at 24% and subject payers to IRS penalties. Promptly request corrected information and, if necessary, a corrected W-9 to avoid withholding and reporting issues.

Who must sign to bind the client entity?

An authorized signer with delegated authority must sign to bind an entity. If authority is unclear, obtain a corporate resolution or power of attorney documentation to confirm signing authority.

How should executed addenda be stored?

Store executed addenda in a secure, access-controlled archive with tamper-evident logs. Maintain backups and retain records according to IRS, HIPAA, and industry-specific retention requirements.

How can the addendum be updated or revoked?

To revise, prepare an amendment signed by the same authorized parties and reference the original addendum. To cancel data consents, follow the withdrawal procedure specified in the addendum and document the change in writing.

Electronic Signature
Templates
Miscellaneous
Client Information Addendum

Client Information Addendum

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

CLIENT INFORMATION ADDENDUM

THIS CLIENT INFORMATION ADDENDUM (the "Addendum") is entered into as of by and between Client Name: and Service Provider: .

WHEREAS

WHEREAS, Client and Service Provider are parties to one or more agreements for professional services and desire to supplement such agreements with up-to-date client contact, billing and engagement information for administration and invoicing purposes;

WHEREAS, the parties wish to confirm the Scope of Work, Payment Terms, confidentiality obligations and governing law applicable to the engagement as set forth in this Addendum;

NOW, THEREFORE, in consideration of the mutual covenants herein, the parties agree as follows:

1. Client Information

Legal Entity Name Doing Business As (DBA) Entity Type (check all that apply)

Individual Corporation LLC Partnership Other:

Primary Contact Name Title Contact Email Contact Phone Address Tax Identification Number

2. Billing Information

Billing Contact Billing Address Invoice Email Preferred Payment Method (check all that apply)

ACH / Bank Transfer Check Credit Card

If ACH selected, Routing Number If ACH selected, Account Number

3. Scope of Work

The parties confirm and describe the services or deliverables to be provided under the governing agreement. Unless otherwise agreed in writing, the Scope of Work set forth below supplements the primary engagement document.

4. Payment Terms

Client shall pay Service Provider as follows. All fees are due in United States Dollars unless otherwise agreed in writing.

Total Fee or Rate Payment Schedule Late Payment Fee

Invoices are due within the period specified in the governing agreement or, if none, within days of receipt. Client is responsible for all reasonable collection costs, including attorneys' fees, for overdue amounts.

5. Term and Termination

This Addendum commences on Start Date: and, unless earlier terminated, will continue until End Date: .

Either party may terminate for convenience upon days' prior written notice. Either party may terminate immediately for material breach that remains uncured after thirty (30) days' written notice of such breach.

6. Confidentiality

"Confidential Information" means non-public information disclosed by one party to the other that is designated as confidential or that, by its nature, should reasonably be treated as confidential. Receiving party shall (a) use Confidential Information solely to perform its obligations under the governing agreement and this Addendum, (b) limit disclosure to employees, contractors or advisors with a need to know and who are bound by confidentiality at least as protective as this Addendum, and (c) take commercially reasonable measures to protect Confidential Information from unauthorized use or disclosure.

Confidentiality obligations do not apply to information that: (i) was known to the receiving party prior to disclosure as evidenced by written records; (ii) becomes public other than through a breach of this Addendum; (iii) is rightfully received from a third party without restriction; or (iv) is independently developed without use of Confidential Information. All confidentiality obligations survive termination of this Addendum for a period of three (3) years, except for trade secrets which shall survive for as long as they qualify as trade secrets under applicable law.

7. Governing Law

This Addendum and any dispute arising out of or relating to it shall be governed by and construed in accordance with the laws of the State of , without regard to conflict of law principles.

8. Entire Agreement and Amendments

This Addendum, together with the governing agreement(s) between the parties, constitutes the entire agreement with respect to the subject matter hereof and supersedes all prior and contemporaneous understandings and agreements, whether written or oral. Any amendment to this Addendum must be in writing and signed by authorized representatives of both parties.

9. Miscellaneous

If any provision of this Addendum is held invalid or unenforceable, the remaining provisions shall remain in full force and effect. Neither party may assign its rights or obligations without the prior written consent of the other party, except to a successor in interest by merger or sale of substantially all assets.

Notices required or permitted hereunder must be in writing and delivered to the addresses set forth in this Addendum or to such other address as a party designates by written notice to the other.

Acknowledgment

The undersigned each represent and warrant that they are authorized to execute this Addendum on behalf of the party for whom they sign and that by signing below such party agrees to be bound by the terms set forth herein.

Client:

By:

Date:

Service Provider:

By:

Date:

What the Client Information Addendum Is

The Client Information Addendum is a short, standardized attachment to an agreement that collects and confirms key client data needed for onboarding, billing, compliance, and recordkeeping. It typically records legal entity name, primary contacts, tax identification, billing instructions, authorized signers, and any required privacy or HIPAA data-use permissions. Organizations use this addendum to reduce back-and-forth, create a single source of truth for administrative details, and ensure the main agreement references accurate client information throughout the engagement lifecycle.

Why organizations include a Client Information Addendum

A clear addendum minimizes administrative errors, speeds onboarding, and centralizes client data for billing, tax reporting, and compliance. It also documents signer authority and consent for electronic records where required under U.S. law.

Who completes the Client Information Addendum and why

Use it as part of your onboarding checklist to prevent rework and to document consent for electronic communications under ESIGN and UETA.

Law firms and legal departments who must record authorized signers and retain verifiable contact records.
Finance and accounting teams that need accurate billing, W-9/TIN data, and invoicing instructions.
Client success and onboarding teams that require primary contacts and delivery preferences to begin work quickly.

Core elements of a professional Client Information Addendum

A complete addendum is concise but comprehensive: it confirms identity, tax and billing details, contact points, signer authority, confidentiality choices, and any regulatory consents relevant to the engagement.

Client Identity

Full legal name, DBA if applicable, and entity type (individual, LLC, corporation). This ensures legal accuracy for contracts and tax reporting.

Tax and TIN

Federal Tax ID or SSN and W-9 attachment or confirmation. Accurate TINs prevent backup withholding and support 1099 reporting.

Primary Contacts

Names, roles, phone numbers, and business email addresses for billing, technical, and legal contacts to streamline communications.

Authorized Signers

Name, title, and authorization scope for each signer. Identifying authority avoids later disputes over contract validity.

Data & Privacy Notes

Indicate HIPAA, FERPA, or other data protections and whether a Business Associate Agreement or privacy addendum is required.

Billing Instructions

Preferred billing address, payment terms, PO number if required, and electronic payment preferences to reduce invoicing delays.

Required client data fields (short reference)

Full legal name: Exact name on government ID

Tax identifier: EIN or SSN/TIN

Primary email: Business address for notices

Billing address: Street, city, state, ZIP

Authorized signer: Name and title

Data classification: HIPAA/FERPA indicator

Step-by-step: completing the addendum

Follow these practical steps to complete and verify the Client Information Addendum before attaching it to the main agreement.

01

Gather documents: Collect W-9, formation documents, and an ID for verification.
02

Fill core fields: Enter legal name, TIN, address, and contact details.
03

Confirm signer: Record authorized signer name and job title precisely.
04

Attach consents: Include privacy/HIPAA addenda and signature block.

How to set up an online completion workflow

Configure your digital workflow to minimize friction and ensure required fields are completed before submission.

Field	Validation \| Required
Legal Name	Exact match validation \| Yes
TIN / SSN	Numeric format check \| Yes
Email	Email format check \| Yes
Authorized Signer	Role dropdown + upload ID \| Yes

Where to send or store the completed addendum

Decide routing and storage points so the addendum is usable across invoicing, legal, and customer records systems.

Billing system: Attach to the client account in accounting software.
Contract file: Store with the executed master services agreement.
CRM record: Update contact and company records for sales and support.
Secure archive: Retain in compliance-controlled storage for audits.

Digital delivery and signing requirements

Ensure the platform you choose supports required authentication, audit trails, and export formats for compliance and recordkeeping.

Formats: PDF, DOCX accepted
Integrations: CRM, accounting, cloud storage
Security: TLS 1.2/1.3 and AES-256

Timelines to collect and process the addendum

Set clear internal deadlines so client onboarding and compliance checks proceed without delay.

Submission deadline:

Provide addendum within 5 business days of engagement acceptance

Tax reporting:

Obtain TIN before year-end 1099 processing (prepare by Jan)

Onboarding hold:

Delay work start until required fields verified

Record export:

Export executed addendum to archive within 24 hours

Periodic review:

Reconfirm data annually or on contract renewal

Common mistakes when preparing a Client Information Addendum

Entering a trade name instead of the legal entity name, causing mismatch with tax and payment systems.
Failing to capture the authorized signer’s title and scope, which can invalidate subsequent approvals.
Omitting a required HIPAA or privacy addendum when handling protected health information.
Allowing partial or handwritten TINs that trigger backup withholding or tax-reporting delays.

Risks and potential penalties from incorrect or missing information

Backup withholding: 24% may apply for incorrect or missing TIN

Tax penalties: Late or incorrect 1099s incur IRC §6721 penalties

HIPAA exposure: Improper consents increase regulatory liability

Contract disputes: Unclear signer authority risks enforceability issues

Payment delays: Missing PO or billing info stalls invoices

Recordkeeping failures: Insufficient retention can hamper audits

How the Client Information Addendum compares to similar templates

This table contrasts the addendum with related documents so teams select the correct form for each administrative need.

Criteria	Client Information Addendum	Client Intake Form
Primary purpose	administrative details	intake + needs assessment
Length	short, 1–2 pages	longer, multiple pages
Signature required		sometimes
Used for billing		often

eSignature vendor comparison for signing the addendum

Basic pricing and capability differences for common eSignature vendors. signNow is listed first per standard comparison formatting.

	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	Varies	Varies	Varies
Bulk Send	Yes	Yes	Yes	Yes	No
Audit Trail	Yes	Yes	Yes	Yes	Yes
Envelope Cap	No cap	100 envelopes/user/year	Varies	Varies	Varies

Who may sign the addendum

Client Representative

Typically the client’s primary administrative contact signs for nonbinding confirmations or operational updates; if signature must bind the entity, confirm the person is an officer or has documented delegated authority.

Authorized Signer

An officer, partner, or an individual with explicit delegation signs binding agreements; include title, attach delegation evidence if entity structure requires proof.

Real-world examples using a Client Information Addendum

These two examples show how organizations use an addendum to streamline onboarding and enforce compliance requirements.

Martin Properties

The property management firm standardized an addendum to capture owner and tax details at lease inception.

This reduced repeated follow-ups for missing W-9s.
Tim Martin, Founder, reported processing and executing documents online with compliance and security, enabling efficient remote closings across multiple properties.

Fertility Centers

A healthcare provider added HIPAA flags and required BAAs to its addendum during patient onboarding.

This ensured PHI handling rules were documented before services began.
John Butler, Founder, praised the platform’s responsiveness and API flexibility that helped integrate signed addenda with clinical and billing systems.

Frequently asked questions about the Client Information Addendum

Answers to common questions about completion, signing, storage, and legal validity for U.S. transactions.

Need help? Contact support

Can the addendum be signed electronically?
Yes. Electronic signatures are legally enforceable for most transactions under the ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted. Ensure the signer demonstrates intent, consents to electronic records, attribution is clear, and the record can be retained.
When is notarization required?
Notarization is rarely required for a plain information addendum unless state law or the attachment to a specific instrument (deed, POA) requires it. Remote online notarization rules vary by state; verify local notary statutes before notarizing.
What if the TIN provided is incorrect?
An incorrect TIN can trigger backup withholding at 24% and subject payers to IRS penalties. Promptly request corrected information and, if necessary, a corrected W-9 to avoid withholding and reporting issues.
Who must sign to bind the client entity?
An authorized signer with delegated authority must sign to bind an entity. If authority is unclear, obtain a corporate resolution or power of attorney documentation to confirm signing authority.
How should executed addenda be stored?
Store executed addenda in a secure, access-controlled archive with tamper-evident logs. Maintain backups and retain records according to IRS, HIPAA, and industry-specific retention requirements.
How can the addendum be updated or revoked?
To revise, prepare an amendment signed by the same authorized parties and reference the original addendum. To cancel data consents, follow the withdrawal procedure specified in the addendum and document the change in writing.

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