Are side letters legally enforceable?

Yes, when they meet contract elements and are properly executed. Electronic signatures meeting ESIGN (15 U.S.C. ch. 96) and UETA standards are generally enforceable, subject to exceptions such as certain testamentary or court-ordered documents.

Should a side letter be recorded?

Generally no; side letters are often confidential contracts. Recordation is only required if the letter creates an interest in real property or affects title; consult title counsel before recording.

Can a side letter be e-signed?

Yes; electronic execution that demonstrates intent, consent, attribution, and retention satisfies ESIGN/UETA rules. Consumer-facing changes may require ESIGN consumer disclosures per 15 U.S.C. §7001(c).

Is notarization or RON required?

Not usually required for a simple side letter, but notarization or RON may be advisable where acknowledgment is needed or to strengthen evidentiary value; follow state RON and notary rules if used.

How do I amend or revoke a side letter?

Amendments should follow the express modification clause in the side letter or be signed by all parties. Revoke only where contractually permitted and document the revocation in writing.

Who should review the side letter before signing?

Have loan counsel, title counsel, and relevant internal stakeholders review for conflicts with recorded instruments and operational feasibility to avoid unintended risks.

Electronic Signature
Templates
Finance
Side Letter Mortgage Agreement

Side Letter Mortgage Agreement

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

SIDE LETTER MORTGAGE AGREEMENT

This Side Letter Mortgage Agreement ("Agreement") is made as of between:

Lender Name:

Borrower Name:

RECITALS

A. Lender and Borrower are parties to that certain Loan Agreement and related Mortgage, Deed of Trust or Security Instrument identified as the "Mortgage Instrument" dated and recorded at under instrument number or book/page .

B. The parties desire to set forth certain supplemental agreements, clarifications and limited modifications relating to the Mortgage Instrument and Loan Documents as set forth in this Side Letter, without releasing, discharging or otherwise constituting a novation of the Mortgage Instrument, Loan Documents or other security.

MORTGAGE / LOAN REFERENCE

Loan / Mortgage Reference Principal Amount Property Legal Description

AGREEMENT

1. Incorporation. The recitals above and the defined terms of the Mortgage Instrument and Loan Documents are incorporated by reference. This Side Letter is supplemental to, and does not supersede, amend or otherwise modify except as expressly provided herein, the Mortgage Instrument or Loan Documents.

2. Limited Amendment. Subject to the terms and conditions of this Agreement, Lender and Borrower agree that the following limited modification shall apply to the Mortgage Instrument:

3. No Novation; Continuing Security. Except as expressly amended by this Side Letter, the obligations secured by the Mortgage Instrument remain in full force. This Side Letter shall not constitute a waiver, release, discharge or novation of any obligation or security unless expressly stated in writing.

4. Priority; Recording. The parties agree that the Mortgage Instrument remains secured by the Property and shall retain its original priority except to the extent this Side Letter expressly affects priority. Recording of this Side Letter is: Required Not Required

5. Representations and Warranties. Each party represents and warrants to the other that: (a) it has full power and authority to enter into this Side Letter; (b) the execution and delivery and performance of this Side Letter have been duly authorized; and (c) this Side Letter constitutes a valid and binding obligation enforceable in accordance with its terms.

6. Covenants. Borrower covenants that all representations in the Mortgage Instrument remain true and correct as of the date hereof except as disclosed in writing to Lender. Borrower shall execute and deliver such further instruments as reasonably requested by Lender to effectuate the terms of this Side Letter.

7. Costs and Expenses. The prevailing party in any dispute with respect to this Side Letter shall be entitled to recover reasonable attorneys' fees and costs from the non‑prevailing party, in addition to any other relief awarded.

8. Notices. Notices under this Side Letter shall be given in writing to the addresses set forth below and shall be effective upon personal delivery or three (3) business days after deposit with a nationally recognized overnight courier or certified mail, return receipt requested.

NOTICES

Lender Notice Address Borrower Notice Address

MISCELLANEOUS

9. Governing Law. This Side Letter shall be governed by and construed in accordance with the laws of the state of without regard to its conflicts of law principles.

10. No Waiver. No delay or failure to exercise any right or remedy shall operate as a waiver. No single or partial exercise shall preclude further exercise of any right or remedy.

11. Entire Agreement. This Side Letter, together with the Mortgage Instrument and Loan Documents, contains the entire agreement between the parties relating to the subject matter hereof and supersedes all prior and contemporaneous agreements relating to such subject matter to the extent expressly amended herein.

12. Counterparts and Electronic Signatures. This Side Letter may be executed in counterparts and by electronic signature, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Additional Terms or Conditions

CERTIFICATION

Each party executing below certifies that the individual signing on its behalf is authorized to bind such party and that the representations and covenants set forth above are true and correct as of the date of execution. Execution of this document shall not be effective until delivered to the other party in accordance with the Notices provisions above.

Lender Printed Name:

By:

Date:

Borrower Printed Name:

By:

Date:

What a Side Letter Mortgage Agreement Is and When It’s Used

A Side Letter Mortgage Agreement is a supplemental contract that records negotiated exceptions, clarifications, or additional covenants tied to an existing mortgage or loan agreement. It runs alongside the primary loan documents and typically addresses lender concessions, payment arrangements, subordination, collateral carve-outs, borrower waivers, confidentiality terms, or special servicing instructions. Although often confidential, a properly executed side letter can create binding contractual obligations between parties and affect priorities among creditors if its terms modify the legal relationships established by the mortgage and related security instruments.

Why a Side Letter Mortgage Agreement Matters

A side letter clarifies deal-specific exceptions that the main mortgage omits, reduces closing delays, memorializes lender-borrower understandings, and helps prevent disputes over priority, payment treatment, or permitted transfers.

Common Parties Who Prepare or Sign a Side Letter Mortgage Agreement

Typical parties involved before, during, and after mortgage closings.

Commercial lenders and syndicates: Lead lenders or agent banks draft and approve side letters to document concessions and servicing instructions.
Borrowers and sponsors: Borrower entities request or accept side letters to secure bespoke terms that differ from the standard loan agreement.
Legal, title, and closing counsel: Attorneys and title companies review side letters for enforceability and consistency with recorded instruments.

Each signatory should confirm authority to bind the entity and coordinate delivery with closing packages.

Essential Elements to Include in a Professional Side Letter Mortgage Agreement

A well-drafted side letter is concise, tracks back to the principal loan documents, and includes clear operational details so it can be implemented and enforced without contradicting recorded instruments.

Parties

Identify each party by full legal name, entity type, and contact details; include borrower, lender(s), agent, and any guarantor(s).

Effective Date

State the effective date exactly and note whether it is simultaneous with the loan closing or a later agreed date tied to performance.

Relation to Mortgage

Explain how the side letter interacts with the mortgage and loan documents — whether it amends, supplements, or interprets specified provisions.

Payment & Forbearance

Document any modified payment schedules, temporary forbearance, fee waivers, or capitalization terms and the conditions triggering them.

Priority / Subordination

Clarify priority effects, subordination, or non-disturbance commitments and whether recording or consent is required for effectiveness.

Confidentiality and No Waiver

Include confidentiality obligations, non-waiver language for defaults, and dispute resolution or governing law provisions.

Key Information You Must Capture

Loan Identifier: Loan number or file ID

Borrower Legal Name: Exact entity name

Lender Name: Lead lender / agent name

Property Description: Legal description

Effective Date: MM/DD/YYYY

Signatory Authority: Signer title or role

Step-by-Step: How to Prepare and Execute a Side Letter

Follow these practical steps to create, review, and finalize a side letter that aligns with the loan documents and closing process.

01

Review Loan Documents: Compare terms to avoid contradictions
02

Draft Limited Language: Keep scope narrow and specific
03

Obtain Internal Approvals: Get sign-off from credit and legal teams
04

Execute and Distribute: Sign, notarize as needed, and circulate

Configuring an Online Workflow for Side Letter Execution

Set up a digital workflow that matches your signing order, authentication needs, and retention policy to reduce errors at closing.

Field	Configuration
Signature Authentication	Email + SMS code or stronger KBA
Conditional Fields	Show clauses only when applicable
Template Reuse	Save redlined master as template
Audit Trail	Enable timestamps and IP capture

Technical Requirements for Digital Completion and Storage

Ensure your eSignature platform supports required formats, authentication, and long-term storage before using it for a side letter.

File Formats: PDF, DOCX supported
Integrations: Salesforce, NetSuite, Google Workspace
Authentication: Email, SMS, KBA, 2FA

Verify the chosen platform meets ESIGN/UETA requirements and any industry-specific compliance such as HIPAA or 21 CFR Part 11 where applicable.

Where to Send and Who Should Receive Executed Side Letters

After execution, route the signed side letter to internal and external stakeholders to ensure consistent implementation and recordkeeping.

Lender Counsel: Primary copy for loan file
Borrower Representative: Retain for corporate records
Loan Servicer / Agent: Operationalize servicing instructions
Title Insurer / Escrow: Provide copy when relevant

Practical Tips for Accurate and Efficient Completion

Simple habits reduce post-closing issues and preserve enforceability; adopt consistent naming, version control, and distribution practices.

Use Consistent Names

Match borrower and lender names to loan documents to avoid identity disputes.

Limit Scope

Keep side letters narrowly focused to reduce conflicts with recorded instruments.

Document Approvals

Record internal approvals and signatory authority to support enforceability.

Retain Originals

Keep executed originals or certified electronic copies in the loan file.

Timing Considerations and Common Deadlines

Timing expectations vary by transaction; coordinate side letter execution and distribution with the main loan closing timeline to avoid implementation gaps.

Execution Timing:

Execute on or before the loan closing date

Delivery to Lender:

Provide signed copy immediately after execution

Title/Insurance Delivery:

Send to title insurer within standard underwriting period

Recording:

Record only when required by effect on title

Retention:

Preserve copies per corporate and regulatory policies

Key Risks and Consequences of Errors

Priority Disputes: Conflicts over lien priority

Default Triggers: Unintended covenant breaches

Enforcement Issues: Ambiguous language handicaps remedies

Tax Exposure: Unclear consideration may create tax issues

Confidentiality Breach: Leaks may harm negotiations

Invalid Execution: Wrong signer or format risks invalidity

How a Side Letter Differs From Other Mortgage Addenda

Compare typical characteristics of side letters and related instruments to choose the right vehicle for a negotiated change.

Document Type	Side Letter	Subordination Agreement
Purpose	contractual exceptions	alters lien priority
Confidentiality	often confidential	typically public or recorded
Recording	usually not recorded	may be recorded
Typical Use	deal-specific concessions	priority adjustments

Comparing eSignature Vendors for Side Letter Execution

Basic vendor pricing and capability snapshot for eSigning and managing side letters; signNow is listed first per platform comparison guidance.

	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	Yes	Yes	Yes	No
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes	Yes	Yes	No	No

Real-World Examples of Document Execution and Use

These brief examples show how organizations use digital signing for side letters and related closing documents.

Martin Properties — Tim Martin

Tim Martin found online execution reliable for closings.

He highlighted full compliance and mobile signing convenience.
"I can process and execute all of these documents online with 100% compliance and built-in security. Whether on mobile or working offline, I can get forms back to their necessary parties efficiently."

Optica Ventures — Brian Fitzgibbons

Optica used a simple interface to speed document turnaround.

The team emphasized ease of use for customers.
"The interface is simple and easy-to-use for our team; more importantly, it is just as easy for our customers."

Frequently Asked Questions About Side Letter Mortgage Agreements

Answers to common questions about enforceability, eSigning, notarization, confidentiality, and amendment procedures for side letters.

Need help? Contact support

Are side letters legally enforceable?
Yes, when they meet contract elements and are properly executed. Electronic signatures meeting ESIGN (15 U.S.C. ch. 96) and UETA standards are generally enforceable, subject to exceptions such as certain testamentary or court-ordered documents.
Should a side letter be recorded?
Generally no; side letters are often confidential contracts. Recordation is only required if the letter creates an interest in real property or affects title; consult title counsel before recording.
Can a side letter be e-signed?
Yes; electronic execution that demonstrates intent, consent, attribution, and retention satisfies ESIGN/UETA rules. Consumer-facing changes may require ESIGN consumer disclosures per 15 U.S.C. §7001(c).
Is notarization or RON required?
Not usually required for a simple side letter, but notarization or RON may be advisable where acknowledgment is needed or to strengthen evidentiary value; follow state RON and notary rules if used.
How do I amend or revoke a side letter?
Amendments should follow the express modification clause in the side letter or be signed by all parties. Revoke only where contractually permitted and document the revocation in writing.
Who should review the side letter before signing?
Have loan counsel, title counsel, and relevant internal stakeholders review for conflicts with recorded instruments and operational feasibility to avoid unintended risks.

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