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GSA7 min readUpdated June 7, 2026

Letter of Supply for Nonmanufacturer Guide: Reseller Proof, Product Scope, and Supplier Detail

A guide to nonmanufacturer letter-of-supply situations in a GSA offer, including reseller proof, supplier detail, product scope, and supply-chain support.

Built for
GSA MAS offer teams building an eOffer upload package from the Refresh 32 checklist
By the end
Know what the Nonmanufacturer LOS file proves and how to prepare it without creating review friction.
Field guide

Nonmanufacturer LOS review checks

Check 1
A letter that only says 'authorized reseller' without product scope can be too thin for a review package.
Signal
The manufacturer or supplier relationship is clear.
Response
Make the file clear enough that a reviewer can follow it without calling the offer team for basic context.
Check 2
Do not let this upload contradict pricing, SAM data, or narrative responses.
Signal
Product scope and brands are specific.
Response
Make the file clear enough that a reviewer can follow it without calling the offer team for basic context.
Check 3
Do not let this upload contradict pricing, SAM data, or narrative responses.
Signal
The letter date and signer are acceptable.
Response
Make the file clear enough that a reviewer can follow it without calling the offer team for basic context.
Part 1

What this upload proves

The nonmanufacturer letter of supply supports reseller authority and product availability when the offeror is not the manufacturer.

It sits in the product supply-chain lane with Product File data, supplier agreements, and TAA evidence.

Part 2

How to prepare it cleanly

Start by naming the proof role, file owner, source system, date pulled or signed, and whether the file is required, conditional, or optional for the selected offer.

Then compare the file against the pricing workbook, SAM record, eOffer narrative, and category/SIN instructions so the package tells one story.

  • The manufacturer or supplier relationship is clear.
  • Product scope and brands are specific.
  • The letter date and signer are acceptable.
Part 3

What to watch before upload

A letter that only says 'authorized reseller' without product scope can be too thin for a review package.

Use filenames that help the reviewer understand the document before opening it. A clear file name with document type, company, SIN or category when relevant, and date is usually better than an internal shorthand.

The upload goal is calm review: current file, clear purpose, no contradictions.
Examples

What this looks like in practice

Real-world exampleHow a clean Nonmanufacturer LOS upload helps

A dealer offering multiple manufacturer product families obtains separate letters or clear attachments so each product family can be traced to supplier authority.

Frequently asked questions

Is Nonmanufacturer LOS always required?

Treat it as conditional for planning purposes, then confirm the live requirement against the solicitation, eOffer prompts, and selected SIN/category instructions.

Where does Nonmanufacturer LOS fit in the offer package?

It sits in the product supply-chain lane with Product File data, supplier agreements, and TAA evidence.

What is the safest review habit?

Check the document against the pricing file, SAM record, narrative responses, and source instructions before uploading it.