Buying Reagents on a US Federal Grant: What 2 CFR 200 Requires

When research materials are charged to a US federal award, what do the Uniform Guidance cost principles require for the purchase to be allowable, allocable and documented, and what changed in the 2024 revision?

A purchase of research materials charged to a US federal award is allowable when it passes the cost principles in 2 CFR Part 200: the cost is necessary and reasonable for the award, allocable to it, treated consistently, and adequately documented ^[1][3]. Materials and supplies needed to perform the award are allowable direct costs under section 200.453 ^[2].

The 2024 revision of the Uniform Guidance did not rewrite those tests. It moved some numbers and some procurement flexibility, most visibly the dollar line between supplies and equipment ^[4]. What an auditor wants for a reagent order is the same thing it was before: a purchase tied to the award, a record of how the vendor was chosen, and an invoice that matches what arrived.

The tests every charge has to pass

Section 200.403 opens by saying that unless a statute says otherwise, a cost must meet its criteria to be allowable under a federal award ^[3]. Read as a checklist, the criteria are short.

Paragraph (f) is the one most people forget: a cost counted toward cost sharing on another federal program cannot be reused here ^[3]. In a lab with several overlapping awards, that matters more than it sounds.

Materials and supplies under section 200.453

Section 200.453 is brief. Costs of materials, supplies and fabricated parts needed to perform the award are allowable. Purchased items are charged at actual prices after applicable credits. Items drawn from a general stockroom are charged at actual net cost under a recognised inventory pricing method applied consistently. Incoming transportation charges are allowable ^[2].

Two practical points follow. First, the freight on an inbound reagent shipment belongs with the cost of the reagent, so the carrier invoice belongs in the same file. Second, credits matter: a returned or replaced item, or a vendor credit note, reduces the allowable amount, and a charge that ignores it is overstated.

Section 200.453 also lets materials and supplies be charged as direct costs. That is the usual treatment for reagents used in a specific project. A reagent used across the whole lab for every project is a different question, and the answer depends on how your institution classifies shared consumables in its indirect cost proposal. Whatever the institution decides, section 200.403(d) requires it to decide the same way every time ^[3].

Supplies versus equipment after the 2024 revision

The revision published at 89 FR 30046 raised the equipment threshold in the definitions of section 200.1 from $5,000 to $10,000 per unit ^[4]. As the definition reads on 10 October 2026, equipment is tangible personal property with a useful life of more than one year and a per-unit acquisition cost at or above the lesser of the recipient's capitalization level or $10,000. Supplies are all tangible personal property other than equipment ^[1].

For reagents the distinction is rarely close. A vial of research material is consumed in use and has no multi-year life, so it is a supply whatever its price. The threshold matters at the edges of a purchase: a freezer, a balance or a data logger can cross the line, and equipment carries inventory, title and disposition rules that supplies do not.

The sponsor's own rules sit on top

The regulation is the floor. Each agency adds its own terms, and the award document says which apply. For National Institutes of Health awards, the NIH Grants Policy Statement sets the agency's terms and conditions and its cost considerations, and it is incorporated into the award by reference ^[5].

Do not rely on a summary of the Statement for any numeric limit or date. It is revised on a schedule of its own, and a figure remembered from an earlier edition is a common source of disallowed charges. Read the current edition on the agency page and note the edition date in the file.

The same applies to institutional policy. Universities usually add purchasing rules the regulation does not require, such as preferred-vendor lists, approval levels and card limits. A charge can be allowable under the regulation and still breach the institution's own rule, and an audit will test both.

The documentation an auditor expects

Section 200.403(g) requires adequate documentation ^[3]. The regulation does not list the pages, so institutions define the file. A reagent order is well supported when the following can be produced in one pull from the system or the lab binder.

1. The requisition or purchase request, approved by someone with authority over the award, naming the award and the project purpose.
2. The quote or the vendor-selection note, matched to the procurement tier the amount falls into.
3. The purchase order or card transaction record.
4. The vendor's invoice, showing the item description, quantity, unit price, freight and tax.
5. Proof of receipt: a packing slip signed and dated, or a goods-in record.
6. The certificate of analysis, safety data sheet and lot number for the material received.
7. Evidence of payment, and any credit note or return.

The last two items in the middle of that list are the ones that tie the money to the science. The lot number on the invoice, the lot number on the vial and the lot number in the lab register should be the same string. If they are not, the auditor has a financial record and the lab has a research record that cannot be shown to describe the same object.

Vendor selection and the conflict-of-interest standard

Part 200 requires recipients to maintain written standards of conduct covering conflicts of interest in procurement, and it applies those standards to employees involved in selecting and awarding. Practically, that means a researcher should not choose a vendor in which they or a close relative hold a financial interest without the disclosure and approval the institution's policy requires ^[1].

The selection note is where this shows up. A single line is enough for a small purchase: which vendors were considered, why the chosen one was selected, and a statement that no conflict exists. The supporting article on procurement tiers sets out what each dollar band needs. For a research reagent the reasons that usually matter are documentation quality, lot traceability and delivery time, not only unit price.

Charging across awards and moving costs

A reagent bought for work funded by two awards must be split by a reasonable, documented basis, such as the quantity used by each project, and not by whichever award has money left. Allocation is the second half of the allowability test: a cost is allocable to an award only to the extent it is chargeable to that award in proportion to the relative share of the cost the award bears under the cost principles ^[1].

Cost transfers deserve particular caution. Moving a charge from one award to another late in the budget period, because the first award is running short, is a recognised audit finding. If a charge was put on the wrong award, correct it promptly with a written explanation of what happened and who approved the move. A transfer that is made without a stated reason looks like exactly what the rule is written to catch.

Keeping the record with the lot register

The purchasing file and the lot register answer different questions and should point at each other. The purchasing file answers: was this lawful to charge? The register answers: which material did the experiment use? Put the purchase order number in the register entry and the lot number on the receiving record, and a question from either direction can be answered in minutes.

Retention is set by the regulation and by the award. Under Part 200, records are generally kept for a period running from the submission of the final financial report, and the award or the institution may require longer ^[1]. Confirm the period in your institution's record schedule, and do not discard a purchase file while an audit, query or litigation hold is open.

What to check next

Before the next order, open three documents: the award terms, the sponsor's policy statement edition cited in them, and your institution's purchasing and capitalisation policy. Note the date you read each. Then confirm that your requisition template asks for the award, the purpose, the selection basis and the lot number on receipt. If it does not, add those fields. Those four items answer most of what an audit asks about a reagent charge.