Can this letter be signed electronically?

Yes. Electronic signatures are enforceable in interstate commerce under the ESIGN Act (15 U.S.C. §7001) and in most states under UETA. Ensure the signature capture demonstrates intent, consent, attribution, and retention to meet the ESIGN legal-validity test.

Is notarization required to make it binding?

Typically no for standard business customisation letters. Notarization may be required only if the letter replaces a notarized instrument or includes an affidavit; verify state law for specific use cases and document types.

How do I change or update an executed letter?

Create an amendment document clearly referencing the original letter, dated and signed by the same authorized parties. Do not alter executed copies without a signed amendment to avoid enforceability questions.

What if the signer’s name differs from official records?

Ensure the signature block uses the signer's full legal name matching official records; discrepancies can impede enforcement and may require a corrective affidavit or re-execution by the authorized signatory.

How should I store the signed letter?

Store executed documents in encrypted, access-controlled repositories with versioning and audit logs. Retain per applicable federal or industry rules (for example, IRS or HIPAA retention standards).

Can I revoke or cancel the letter after signing?

Revocation depends on the letter’s terms and governing law. If the parties agree, execute a written termination or amendment signed by authorized parties. For unilateral revocations, legal remedies depend on contract language and applicable state law.

Electronic Signature
Templates
Miscellaneous
Business Customisation Letter

Business Customisation Letter

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

BUSINESS CUSTOMISATION LETTER

This Business Customisation Letter (the "Letter") is entered into as of by and between:

Client Name: , Address:

Vendor Name: , Address:

WHEREAS

WHEREAS, Client is engaged in the business of operating and offering its products or services and desires certain customisations to be provided by Vendor in accordance with the terms set forth herein;

WHEREAS, Vendor has represented that it has the expertise, personnel and resources necessary to perform the customisation work described in this Letter and is willing to perform such work for Client under the terms and conditions set forth below;

NOW, THEREFORE, in consideration of the mutual covenants contained in this Letter, the parties agree as follows:

SCOPE OF WORK

Project Title Detailed Scope of Work Deliverables and Acceptance Criteria

PAYMENT TERMS

Total Fee:

Payment Schedule

Late Payment Fee:

All payments shall be made in lawful currency of the United States unless otherwise agreed in writing. Client shall pay undisputed invoices within the timeframe set forth in the Payment Schedule. Disputed amounts will be resolved in good faith and any undisputed portion must be paid when due.

TERM AND TERMINATION

Term Start Date: Term End Date:

Either party may terminate this Letter for convenience upon providing written notice to the other party at least days prior to the effective termination date. Termination for material breach shall be effective immediately if the breaching party fails to cure the breach within thirty (30) days after receipt of written notice specifying the breach.

CONFIDENTIALITY

Definition. "Confidential Information" means non-public information disclosed by either party to the other, whether oral, written or electronic, that is identified as confidential or that reasonably should be understood to be confidential given the nature of the information and the circumstances of disclosure, including but not limited to trade secrets, technical data, business plans and customer information.

Obligations. Each party shall (a) protect Confidential Information of the other party with at least the same degree of care it uses to protect its own confidential information but in no event less than reasonable care; (b) use Confidential Information solely to perform its obligations under this Letter; and (c) not disclose Confidential Information to any third party except to employees, contractors or advisors who have a need to know and who are bound by confidentiality obligations no less protective than those set forth herein.

Exclusions. Confidential Information does not include information that: (i) is or becomes generally available to the public through no fault of the receiving party; (ii) is rightfully received from a third party without restriction; (iii) was known to the receiving party prior to receipt as shown by written records; or (iv) is independently developed without use of the disclosing party’s Confidential Information.

INTELLECTUAL PROPERTY

Ownership. Unless otherwise agreed in writing, Vendor shall retain ownership of pre-existing intellectual property and tools used to perform the services. Client shall own deliverables specifically created for Client and paid for in full, subject to Vendor's rights in any underlying tools, methodologies or software incorporated therein. The parties shall execute any further documents reasonably necessary to effectuate such ownership transfer.

LIMITATION OF LIABILITY

Except for liability arising from willful misconduct, gross negligence or breaches of confidentiality, neither party shall be liable to the other for any consequential, incidental, special or punitive damages. The aggregate liability of either party for claims arising out of this Letter shall not exceed the total fees paid by Client to Vendor under this Letter.

GOVERNING LAW

This Letter shall be governed by and construed in accordance with the laws of the State of , without regard to its conflicts of law rules.

ENTIRE AGREEMENT

This Letter, together with any exhibits or attachments expressly incorporated herein, constitutes the entire agreement between the parties with respect to the subject matter and supersedes all prior and contemporaneous agreements, proposals and communications, whether oral or written. Any amendment or modification to this Letter must be in writing and signed by authorized representatives of both parties.

MISCELLANEOUS

Notices shall be in writing and delivered to the addresses set forth above or to such other address as either party may specify in writing. If any provision of this Letter is held invalid or unenforceable, the remainder of the Letter shall remain in full force and effect.

Client Printed Name:

By:

Date:

Vendor Printed Name:

By:

Date:

What a Business Customisation Letter Is

A Business Customisation Letter is a formal written instruction that specifies tailored terms, deliverables, or configurations for a product or service supplied to a client or partner. It documents the scope of customization, timelines, responsibilities, and any fees or approvals required, and serves as a binding reference once signed by authorized parties. Organizations use this letter to reduce ambiguity when altering standard offerings and to create a clear, auditable record of mutually agreed changes.

Why a Clear Business Customisation Letter Matters

A concise, well-structured letter reduces disputes by documenting agreed changes, clarifies expectations for delivery and costs, and provides an auditable record for compliance and accounting.

Who Typically Prepares and Signs This Letter

Final signatories should be individuals with explicit authority to commit the business to the described changes; see the authority section for guidance.

Small business owners and founders who need to formalize bespoke service arrangements or product specifications with vendors.
Operations and project managers coordinating scope, timelines, and acceptance criteria across internal and external stakeholders.
Legal or contracts teams reviewing terms, liability limits, and approval language before execution.

Essential Sections to Include in the Letter

A professional Business Customisation Letter should include clear identifiers, a precise scope of changes, timeline milestones, pricing or fees, acceptance criteria, and signature blocks to ensure enforceability and traceability.

Header

Include date, sender and recipient company names, addresses, and a unique reference or purchase order number to link the letter to existing contracts or invoices.

Recipient Details

List the recipient contact name, title, department, and preferred contact method so approvals and clarifications route to the correct individual.

Scope of Customisation

Describe in plain language what will change compared to the standard product or service, including exact specifications, deliverables, and any exclusions.

Timeline & Milestones

Specify start and completion dates, milestone checkpoints, and any acceptance testing periods so responsibilities and deadlines are explicit.

Costs & Payment Terms

List fixed fees, hourly rates, payment schedule, invoicing timing, and consequences for late payment or scope changes.

Terms & Signatures

Reference governing agreement if applicable, state law choice, indicate who may sign on behalf of each party, and provide dated signature blocks for authorized signatories.

How to Prepare and Execute the Letter—Step by Step

Use this quick sequence to draft, review, finalize, and archive a Business Customisation Letter with control and clarity.

01

Draft: Populate template fields, describe customizations, and attach technical exhibits as needed.
02

Review: Have legal and finance review costs, liability, and tax implications before approval.
03

Obtain Signatures: Collect signatures from authorized parties using agreed authentication and e-signature methods.
04

Archive: Store the executed letter with related contracts and invoices in a secure, searchable system.

Practical Workflow for Sending and Tracking the Letter

A standard workflow moves the document from preparation through authentication to distribution and final storage, capturing an audit trail at each step.

Prepare Document: Complete the letter, attach specifications or SOW exhibits, and convert to a final file format such as PDF.
Select Signing Method: Choose e-signature, in-person signing, or notarization if required by the parties or jurisdiction.
Deliver for Signature: Send to the recipient via secure email, signed link, or integrated contract workflow with routing rules.
Confirm and Store: Capture signed copies and audit logs, then store them in a compliance-ready repository for retention.

Recommended Online Configuration Settings

When using an electronic workflow, configure these core settings to reduce signer friction and strengthen the audit trail.

Field	Configuration
Template	Lock core fields and allow editable sections only where customization is expected
Conditional Fields	Show or hide pricing or scope items based on earlier selections to prevent contradictory entries
Authentication	Use email plus SMS code or stronger verification for high-value agreements
Delivery Method	Enable signing links and email reminders; allow guest signing where allowed
Storage	Save executed copies to a secure document repository with versioning

Digital Signing and File Compatibility Considerations

Confirm that your chosen platform captures an audit trail (timestamp, IP, actions) and retains copies in encrypted storage for compliance.

File Formats: PDF, DOCX, and HTML are commonly supported for final signed copies
Integrations: Connectors to CRM and ERP systems help automate routing and record linkage
Authentication: Email link, SMS code, KBA, or advanced signer authentication depending on risk

Typical Timelines and Deadlines to Track

Set realistic internal deadlines to avoid bottlenecks and to align expectations for acceptance testing, approvals, and final delivery.

Acknowledgement Window:

Request a written acknowledgment within 3 business days of receipt

Customization Completion:

Define completion within a stated number of days (e.g., 30–90 days) depending on complexity

Signature Deadline:

Specify any required signature-by date to lock rates or resource allocation

Acceptance Period:

Allow a defined acceptance or testing window, for example 7–14 days after delivery

Revision Turnaround:

State expected response times for change requests, typically 5–10 business days

Common Mistakes That Cause Delays or Disputes

Vague scope language that fails to specify deliverables, leading to differing expectations and scope creep.
Using informal signatures or initials without clear authorization, which can create enforceability issues.
Omitting reference to the controlling master agreement or purchase order, causing conflicts about precedence.
Failing to record version history or attachments, making it difficult to confirm which specifications were accepted.

Risks and Potential Consequences of Errors

Contract Ambiguity: May cause disputes or claims

Missing Signature: Document may be unenforceable

Incorrect Party Name: Can invalidate obligations

Late Delivery: May trigger penalties or chargebacks

Tax Impacts: Misstated fees can affect reporting

Data Exposure: Poor storage increases breach risk

Who Is Authorized to Sign and What That Means

Authorized Officer

An individual with corporate authority—such as a CEO, CFO, or other officer—who is empowered under corporate bylaws or board resolution to bind the company to contractual changes. Confirm signatory authority in writing to prevent acceptance disputes or claims of ultra vires acts.

Operations Manager

A delegated manager may sign for operational or technical approvals when the company’s internal policy or a signed delegation of authority explicitly permits such execution. Ensure delegation limits and financial thresholds are documented and current.

Typical eSignature Platform Pricing and Capability Snapshot

Pricing and feature availability vary by vendor and plan. The table compares core starting prices and common capabilities used when delivering and executing Business Customisation Letters.

	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 plan	Varies by plan	Varies by plan	Varies by plan
Bulk Send	Yes (Premium)	Yes	Yes	Yes	Limited
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 by plan	Varies by plan

Frequently Asked Questions About Using the Letter

Answers to common questions about validity, e-signatures, notarization, revisions, and storage for Business Customisation Letters.

Need help? Contact support

Can this letter be signed electronically?
Yes. Electronic signatures are enforceable in interstate commerce under the ESIGN Act (15 U.S.C. §7001) and in most states under UETA. Ensure the signature capture demonstrates intent, consent, attribution, and retention to meet the ESIGN legal-validity test.
Is notarization required to make it binding?
Typically no for standard business customisation letters. Notarization may be required only if the letter replaces a notarized instrument or includes an affidavit; verify state law for specific use cases and document types.
How do I change or update an executed letter?
Create an amendment document clearly referencing the original letter, dated and signed by the same authorized parties. Do not alter executed copies without a signed amendment to avoid enforceability questions.
What if the signer’s name differs from official records?
Ensure the signature block uses the signer's full legal name matching official records; discrepancies can impede enforcement and may require a corrective affidavit or re-execution by the authorized signatory.
How should I store the signed letter?
Store executed documents in encrypted, access-controlled repositories with versioning and audit logs. Retain per applicable federal or industry rules (for example, IRS or HIPAA retention standards).
Can I revoke or cancel the letter after signing?
Revocation depends on the letter’s terms and governing law. If the parties agree, execute a written termination or amendment signed by authorized parties. For unilateral revocations, legal remedies depend on contract language and applicable state law.

be ready to get more

Join over 28 million airSlate SignNow users

Sign Now