What evidence is missing from a bill of materials for BABA compliance

A bill of materials can list every part of a product and still fail to support a BABA determination. The list tells you what you are buying. The evidence tells you where each part was mined, produced or manufactured, and what it cost. Most of the gaps that stall a federally funded bid are not disputes about the verdict. They are missing paperwork behind it.

This guide sets out the evidence a domestic-content determination needs, where bills of materials usually fall short, and how to record a gap honestly. It is not legal advice, and the funding agency's own guidance controls.

Why a bill of materials is not yet evidence

A bill of materials normally records quantities, part numbers and sometimes prices. A determination needs more. For each component it needs an acquisition cost, a place where the material was mined, produced or manufactured, and a document you can point an auditor to. Where the list is silent on any of those, the honest status of that line is unknown. It is not compliant, and it is not non-compliant until the facts are in.

The four gaps that stall most bids

Most incomplete files have the same four holes. The table below pairs each one with the document that usually closes it. Requirements differ between programmes, so check the current guidance for the agency funding your project before you rely on any of them.

Component cost: the number people estimate

The 55 percent test divides the cost of US-origin components by the cost of all components, and the threshold is greater than 55 percent. The cost used is the acquisition cost of each component, which includes shipping, sales tax and duties. It excludes final-assembly labour, factory overhead and profit on the finished product, because those are not components. The most common error is pasting the price of the finished product into the BOM, which mixes in costs the test does not count. Take each component figure from an invoice or purchase order and note its currency and date. The calculation guide walks through how the arithmetic then works.

Origin: a claim the supplier has to back up

Origin is where a bill of materials stays vaguest. A word such as domestic or imported written beside a line is a claim, not evidence. What an auditor wants is a statement from the manufacturer that names the production location for each material. Georgia's CDBG guidance treats a manufacturer's signed certification letter as the most direct proof that delivered products comply. Its basic elements are a product description and the manufacturing location, ideally tied to a purchase order, invoice or bill of lading for the delivery. The certification letter guide covers how to set that letter out.

Sub-components: the gap inside a manufactured product

A manufactured product can be assembled in the United States from components that were themselves made abroad, and the 55 percent test counts the components, not the assembly. A BOM that lists only the finished product's top-level parts therefore hides the calculation. The guidance on what counts toward the cost of components sits in 2 CFR part 184, and EPA's June 2026 job aid for manufacturers works through the calculation. Ask the manufacturer for the next level down rather than accepting the top level as final. The guidance also recognises that a manufacturer may make its own components, so a vertically integrated supplier may be able to answer for its sub-components directly.

Process evidence for iron, steel and construction materials

Iron and steel and construction materials have no percentage to hit, so the gap is the process chain. A line that says steel pipe tells you nothing about where the melt happened or where the coating was applied, and one offshore step fails the whole article. The evidence you need is a list of each manufacturing step with its location. The iron and steel guide sets out the chain from melt to coating that the list has to cover.

Waivers need their own paperwork

When a line cannot be closed with evidence, a waiver is the route to a decision, and it asks for different documents. EPA's Office of Water checklist for project-specific waivers asks for a product-category designation for each item, approximate product costs, the total project cost, and engineering specifications tied to the products concerned rather than vendor catalogue pages. It also asks for records of supplier efforts, including the domestic suppliers contacted and the correspondence with them. Oregon's clean water state revolving fund form asks for the quantity and materials of each product. A waiver therefore does not make a missing BOM line go away: the request needs the same product-level detail. The waiver guide explains which category each request falls under, and a waiver still has to be granted by the agency before the line counts as compliant.

Record the gap instead of filling it with an estimate

An insufficient-data outcome is a legitimate result. If the origin of a component is unknown, the line should read as unverified, with the reason recorded and the request you sent. It should not be marked domestic because the supplier is a US company, and a supplier's head office is not the place the product was made. A written request log, showing what you asked for, from whom, when, and what came back, turns an open question into a documented item that can be closed. A documented gap is easier to defend than a confident guess, and it is what an auditor will ask to see.

• Per-component acquisition cost from an invoice or purchase order, with currency and date
• A written statement of the mining, production or manufacturing location for each material
• The next level of sub-components for every manufactured product
• For iron, steel and construction materials, the list of manufacturing steps and where each one took place
• A signed certification letter that describes the product and references the delivery documents

For the government-wide framework, start with the Made in America guidance from OMB. The 2023 Federal Register notice on the guidance for grants and agreements sets out the rules the funding agency applies, and the checklist for the full sequence of compliance steps shows where the evidence is needed in the bid.

Sources

• EPA, job aid for manufacturers on the cost of components
• Georgia Department of Community Affairs, BABA compliance requirements for CDBG
• EPA Office of Water, project-specific waiver checklist
• Oregon Department of Environmental Quality, CWSRF BABA waiver request form
• Federal Register, 2023 guidance for grants and agreements