Written and maintained by CASRAI Editorial Board
Published · Last updated
On this page
Short answer
A net 30 account is a supplier-extended trade credit arrangement: you receive goods or services now and pay the invoice within 30 days. Before you open one with a lab or clinic supplier, get four things in writing: the event that starts the 30 days, the late-payment and account-restriction terms, whether and to which credit bureaus the supplier reports, and the documents the supplier needs from you. This page is general procurement information, not legal or financial advice.
Definition and scope
“Net 30” means the full invoice amount is due 30 days after a start date. In commercial practice that start date is commonly the invoice date, but it is a contract term, not a universal rule, so it can instead be the shipping date or the receipt date. Business-credit guidance from Nav (a commercial source, checked 2026-11-03) describes a net 30 account as supplier or trade credit with payment due 30 days after the invoice date.
A net 30 account is therefore the standing arrangement under which a supplier invoices you on those terms. The wording “net 30 account”, “net 30 accounts” and “business net 30 account” all describe the same thing: a buyer account with 30-day terms. The terms of any single order are covered in net 30 terms for medical supply orders, and the verification side in the net 30 payment terms and vendor account verification entry.
How a net 30 account works in practice
The usual sequence is an application, a supplier decision, an order, an invoice, and payment within the window. Each step has something worth confirming before you rely on the account.
- Application. The supplier typically asks for business identity details and may ask for references. See the vendor application form guide and the vendor onboarding documentation checklist for what such requests usually cover.
- References. Some suppliers ask for trade references; trade references in vendor qualification explains how those are used.
- Invoice and due date. Your accounts-payable process needs a due date it can compute. Invoice processing describes how invoices move to payment.
- Payment or late payment. What happens next depends on the supplier’s written terms (see below).
Worked example: why the start event must be in writing
The U.S. federal Prompt Payment rules show how much the start event matters. Under 5 CFR 1315.4(g)(1)(iv) (via Cornell LII, checked 2026-11-03), the default due date for federal payments is 30 days after the start of the payment period, and that period begins on receipt of a proper invoice, if the contract does not specify otherwise, no discount is taken and no accelerated payment method is used. The U.S. Treasury Bureau of the Fiscal Service’s Prompt Payment page (checked 2026-11-03) ties timeliness to a proper invoice reaching the correct agency office. This is a federal rule for federal agencies. It does not govern private net 30 accounts, but it illustrates the point: “30 days” is only as clear as the event that starts the clock.
Related terms and variants
Net 30 accounts for new business
Whether and on what terms a supplier opens an account for a new business is that supplier’s own policy. Ask it directly which documents and references it needs rather than assuming a standard.
Net 30 accounts with “instant approval”
Approval speed is a supplier claim, not a feature of net 30 terms. Treat it as a question to ask: what is checked, and are the terms the same as those shown at checkout? Compare the written terms, not the headline.
Related payment-term concepts
Longer or shorter terms and discounts are separate decisions. See net 30 vs net 60 vs net 90 terms, the 2/10 net 30 early payment discount and due upon receipt.
Where it matters for lab and clinic purchasing
Lab and clinic purchasing often runs through recurring consumables and equipment orders, so the payment terms apply to many invoices, not one. That makes a short pre-opening checklist the practical decision aid. Each row is a question to put to the supplier, and the answer should be on paper before you place a first order.
| Ask the supplier | Why it matters |
|---|---|
| What event starts the 30 days: invoice date, ship date or receipt? | Sets the due date your payables team will track. Federal rules key the clock to a proper invoice, as above. |
| What happens on a late payment: fees, interest, a hold on new orders, a change of terms? | Private accounts follow the supplier’s written terms. See late payment fees. |
| Does the supplier report payment history to business credit bureaus, and to which? | Nav notes that only some vendors report, so a net 30 account is not always a credit tradeline, and that reporting policies change. |
| What documents and references does the supplier need? | Lets you prepare before applying. See the onboarding checklist linked above. |
Common misunderstandings
- “30 days always starts at delivery.” Not necessarily; it is whatever the contract says.
- “Every net 30 account builds business credit.” Only if the supplier reports. Ask in writing, and do not rely on a promotional claim.
- “The federal 30-day rule applies to my account.” It applies to federal agency payments, not private buyers.
FAQ
What does the term net 30 mean?
Net 30 means payment of the full invoice is due 30 days after a start date set by the contract, commonly the invoice date. Confirm the start event with the supplier.
What happens if a company does not pay net 30?
For private accounts, the consequence is whatever the supplier’s written terms say, such as a late fee, interest, a hold on future orders or a change in terms. For payments by U.S. federal agencies, 5 CFR 1315.4(i) provides that when payments are made after the due date, interest is paid automatically under the procedures in that part, and the Treasury Prompt Payment page says an agency paying late must in most cases pay interest. Read your own agreement; this is not legal advice.
Is net 30 illegal?
Nothing in the federal sources cited here treats 30-day terms as unlawful. 30 days is the default payment period in the federal Prompt Payment rule cited above, which indicates it is an ordinary standard. Whether a particular contract term is enforceable is a legal question for counsel, not something this page can answer.
Do net 30 accounts report to business credit bureaus?
Some do and some do not. Nav reports that only some vendors report to the bureaus and that new accounts can take one to three billing cycles to appear. Ask the supplier in writing whether it reports and to which bureau.
Sources
- U.S. Department of the Treasury, Bureau of the Fiscal Service, Prompt Payment, checked 2026-11-03.
- 5 CFR 1315.4, Prompt payment, via Cornell Legal Information Institute, checked 2026-11-03.
- Nav, Net 30 accounts, a commercial business-credit guide, checked 2026-11-03.
