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// WORKED EXAMPLETHE ARITHMETIC A DECISION RESTS ON

Borrowing Base Certificate: a Worked Example

The borrower does the sum; the lender checks the working.

BY MICHAEL SHANG · SIXTEEN YEARS IN COMMERCIAL BANKING · UPDATED

// THE SHORT ANSWER

A borrowing base certificate is how an asset-based facility finds out, each period, how large it is. The borrower, not the bank, does the calculation: it takes debtors and stock from its own ledgers, removes what the agreement says cannot be lent against, applies the advance rates and reserves, and signs the result. Drawings above the figure have to be repaid. Because the bank is lending on the borrower's arithmetic, much of its work goes into testing that arithmetic against the ledgers, the cash coming in and periodic examinations of the books, so that a generous certificate is caught before it becomes a larger loan.

BASIS  Practitioner judgment from sixteen years in commercial banking, set out in How Bankers Think (Highbank Press, 2026). Every borrower on this site is a composite constructed for teaching, not a client. The market is mid-market commercial lending as practised in New Zealand and Australia; where a convention differs elsewhere, the page says so.

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// 01 — WHY THE BORROWER DOES THE SUM

An overdraft has a limit that stays put until someone changes it. An asset-based facility has a limit that moves with its collateral: as debtors are collected and stock is sold, the amount the lender will advance changes, faster than any credit review could follow. The certificate keeps the limit current. The borrower produces the figures because they come from its own sales ledger and stock system; the lender writes the rules for what counts. The signature matters. An officer of the borrower certifies the figures, and in many agreements a materially wrong certificate is a default in itself.

Frequency follows risk. Monthly reporting is common, and weekly or even daily reporting is used where collateral turns over fast or the borrower is under strain. In the United States, the national-bank supervisor's handbook describes weekly or monthly certificates as common in asset-based lending, with field examinations before the facility is booked and regularly after, often quarterly. Asset-based lenders in New Zealand, Australia and the UK work to broadly similar routines, set facility by facility.

// 02 — HOW THE CERTIFICATE IS BUILT

Gross receivables, from the aged debtors report
− ineligible receivables (aged, cross-aged, related party, contra, disputed …)
= eligible receivables × receivables advance rate
+ eligible stock × stock advance rate, where stock is in the base
− reserves
= borrowing base
Availability = the lower of the base and the facility limit
Headroom = availability − drawings

Every line is a definition in the agreement. Ineligibles are the invoices the lender will not lend against, for reasons running from age and cross-ageing to contra balances with customers that are also suppliers. Reserves are amounts held back for risks the advance rate does not cover, such as the cost of collecting the ledger after a default, or claims that would be paid ahead of the lender in an insolvency. Some employee entitlements are among those claims in all three markets, but each reaches different collateral: in the UK, assets under a floating charge; in Australia, assets under a circulating security interest, which a purchase of the debts is not; in New Zealand, receivables and inventory, unless the lender's interest is a perfected purchase-money interest or a perfected purchase of the receivables for new value. Where stock is in the base, its advance rate is commonly lower than on receivables and set with an eye to what the stock would fetch in a sale.

// 03 — THE EXAMPLE

A plumbing and heating distributor, constructed for this page, has a US$7.5m facility secured on its debtors and stock. Its month-end certificate, in US$000, uses the agreement's rates, which are the example's and not a market norm:

Gross receivables 8,400
over 90 days − 620
cross-aged − 180
related party − 240
contra balances − 160
Eligible receivables 7,200 × 80% = 5,760
Stock 5,000 less slow-moving and in transit 1,000
Eligible stock 4,000 × 50% = 2,000
Reserve for preferential claims − 400
Borrowing base (below the 7,500 limit) 7,360
Drawn 7,100
Headroom 260

The quarterly field examination tests the certificate against the books and finds two things. Invoices of US$300,000 dated the last day of the month were for goods dispatched in the first week of the next, so they were not yet debts. And credit notes of US$250,000, issued after month-end, related to goods returned before it. Both come out. The stock line stands, because the warehouse system counted both lots of goods at the month end; on the certificate they were being lent against twice:

Eligible receivables 7,200 − 300 − 250 = 6,650 × 80% = 5,320
Borrowing base 5,320 + 2,000 − 400 = 6,920
Drawn 7,100
Over-advance (180)

The certificate showed US$260,000 of headroom; the true position was US$180,000 over. Neither finding needed dishonesty. Invoicing ahead of dispatch to meet a month-end target, and booking returns slowly, are habits of a busy finance team. Together they overstated the base by US$440,000, and the agreement requires the excess to be repaid, in this example within two business days, at the point the borrower's cash is tightest.

// 04 — WHAT THE LENDER READS BESIDE IT

The certificate is a summary, and the lender checks it against what sits underneath. The aged debtors report should total to the gross receivables line, and the sales ledger should agree with the general ledger. Receipts should match what reached the collection account. And the debtors should roll forward:

Opening debtors + invoices raised − cash received − credit notes ± adjustments = closing debtors

A gap in the roll-forward means something entered or left the ledger outside the normal flow. Dilution, the share of invoices that end as credit notes rather than cash, shows whether the advance rate still leaves enough margin. Between examinations, lenders confirm balances with debtors where the facility allows it, test samples of invoices against delivery records, and watch trends: ineligibles rising as a share of the ledger, cash received falling against sales, a certificate that lands just under the limit month after month.

DEFINED IN ONE PARAGRAPH → · AVAILABILITY → · ELIGIBLE RECEIVABLES →

// 05 — WHERE IT DECIDES A FILE

At approval, the question is whether the borrower can produce an accurate certificate at all: a ledger that ages invoices correctly, a stock system that counts at cost by location, a finance team that books returns when the goods come back. A lender that doubts the systems can lower the advance rate, add reserves or ask for more frequent reporting. Each of those terms is negotiated, and each is availability given or withheld.

In monitoring, the certificate is often the earliest warning a lender gets. A business under pressure tends to show it here first, in rising ineligibles, in credit notes booked later, in invoices raised a little earlier each month. A credit officer who reads the certificates as a series rather than one number at a time sees the pressure before it reaches the accounts.

PRODUCT FILE: INVOICE FINANCE → · WHAT TO SEND YOUR BANK EACH MONTH →

// SOURCES

The documents the statements on this page rest on. Each was opened and checked when cited.

  1. Office of the Comptroller of the Currency, Comptroller's Handbook: Asset-Based Lending (version 1.1, 2017) — 'Field Audits' and 'Financial Reporting Requirements', pp. 22–23 — The US national-bank supervisor's description of borrowing base certificates as often required weekly or monthly, and of field audits testing collateral against the certificates before a facility is booked and regularly after, often quarterly — section 01.

// QUESTIONS PEOPLE ASK

How often is a borrowing base certificate submitted?
As often as the agreement says, which usually depends on how fast the collateral moves and how much risk the lender sees. Monthly is common for a stable business; weekly or daily reporting is used for fast-turning stock, seasonal peaks or a borrower under strain. Some agreements also require a fresh certificate with each drawing request, so that the lender is not advancing on stale figures.
What is an over-advance?
An over-advance is a drawn balance that exceeds the borrowing base, so the loan is larger than the collateral the lender agreed to lend against. It can arise because collateral has fallen, because a certificate was wrong, or occasionally because the lender agrees to a temporary excess for a seasonal peak. Agreements generally require an unagreed over-advance to be repaid promptly, and an unpaid one is usually a default.
What do lenders check in a borrowing base certificate?
That it ties to the borrower's records: the aged debtors report and stock listing behind it, the general ledger, a roll-forward of debtors from last period, and the cash that reached the collection account. Field examinations go further, testing invoices against delivery records, confirming balances with debtors and checking that credit notes are booked in the right period. Trends across certificates matter as much as any single one.
What happens if a borrowing base certificate is wrong?
An honest error is corrected: the certificate is restated, and any excess over the corrected base has to be repaid. The lender may also tighten the terms, with more frequent reporting, extra field examinations, higher reserves or a lower advance rate. A certificate the borrower knew to be false is a different matter. It is usually a default in its own right and destroys the trust on which the facility depends.

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