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Identifies issuing party, address, and contact information so the recipient can verify origin and contact the signer for questions.
A concise Business Source Letter reduces ambiguity about ownership or origin, supports audit trails, and documents representations relied on by counterparties or regulators.
Organizations and individuals use Business Source Letters when provenance affects contractual rights, compliance, or payment authorization.
Use the letter as supporting documentation; retain it per your recordkeeping policy and attach related invoices, contracts, or identification documents.
Identifies issuing party, address, and contact information so the recipient can verify origin and contact the signer for questions.
Names the individual or organization intended to rely on the statement to avoid ambiguity about the letter’s audience.
Specifies exactly what was provided (goods, funds, documents, IP) with dates and identifiers to create a clear audit trail.
A concise declaration of origin and any relevant limitations, warranties, or conditions attached to the source.
Printed name, title, and signature of someone with corporate authority to bind the issuer; include date of signing.
List supporting documents such as invoices, receipts, purchase orders, or notarized IDs that corroborate the representation.
| Field | Configuration |
|---|---|
| Signature Type | Email link or certificate-based as needed |
| Signer Authentication | Email, SMS, or KBA depending on risk |
| Routing Order | Sequential or parallel signers configurable |
| Retention | Immutable PDF plus audit log |
Confirm integrations, file formats, and authentication methods before sending to ensure recipient acceptance.
Align platform capabilities with legal and internal retention needs; record an audit trail and store signed copies in secure repositories.
Supply the letter promptly when requested by a counterparty or regulator
Allow 3–5 business days for legal and finance review
Sign within the effective date period stated in the letter
Retention period begins on the signature date
Acknowledge and respond within 30 days to dispute notices
| Criteria | Business Source Letter | Cover Letter | Power of Attorney |
|---|---|---|---|
| Purpose | provenance proof | introductory note | authority delegation |
| Legal Formalities | formal statement | informal | formal, often notarized |
| Typical Signers | authorized officer | sender | principal |
| Notarization Needed | sometimes | rarely | often |
| 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 (Business Premium) | Yes | Yes | Yes | No |
| Audit Trail | Yes | Yes | Yes | Yes | Yes |
| HIPAA Compliant | Yes (BAA) | Yes (BAA) | Yes (BAA) | No | No |
A venture firm documented funding provenance for LP audit
A real estate manager attached a source letter to tenant credits
CFOs or delegated finance officers commonly certify source-of-funds statements and sign letters that affect accounting, audit, and tax positions. Their signature indicates financial authority and access to supporting records.
Corporate officers or managers with delegated authority sign letters used in contracts or vendor disputes. Documentation of that delegation should accompany the signed letter where authority could be questioned.