What Is a Borrowing Base Certificate?

A borrowing base certificate is a periodic report a borrower submits to its lender showing the current value of the collateral securing a revolving line of credit, and therefore how much the borrower is entitled to draw. It takes the accounts receivable and inventory balances, subtracts the ineligible items, applies an advance rate to what remains, and compares the result against the loan balance outstanding. If the borrowing base falls below what is drawn, the borrower is over-advanced and usually has to pay the difference down immediately.

This article covers what goes into the calculation, the advance rates lenders actually apply, the ineligibles that quietly shrink the base, and what happens when the certificate comes back short.

Last updated July 2026.

What is a borrowing base certificate?

A borrowing base certificate is the document that connects a revolving credit facility to the collateral behind it. In asset-based lending the loan is not sized once at closing; it floats with the value of the assets pledged. As receivables are collected and new invoices are raised, as inventory turns, the collateral pool changes, and the certificate is how the lender sees that change.

The borrower prepares it, an officer of the company certifies it, and the lender uses it to confirm that availability under the line still supports the outstanding balance. It is simultaneously a funding request, a compliance document and, when it is prepared carelessly or dishonestly, the earliest evidence of trouble.

What goes into a borrowing base?

Two asset classes carry most facilities: accounts receivable and inventory. Some borrowing bases also include equipment or real estate at a much lower advance rate, though those are usually financed as separate term debt rather than revolving collateral.

The calculation runs in the same order every time:

Start with the gross balance of each asset class from the aging report or the inventory ledger
Subtract the ineligible portion of each class
Multiply the eligible balance by that class's advance rate
Add the classes together to get gross availability
Subtract any reserves the lender holds against dilution, disputes or priority claims
Compare the result against the loan balance outstanding

How is the borrowing base calculated?

A worked example makes the mechanics concrete. Assume a distributor with $4,000,000 of gross receivables and $2,600,000 of inventory at cost, on a facility advancing 85% against eligible receivables and 50% against eligible inventory.

Step	Accounts receivable	Inventory
Gross balance	$4,000,000	$2,600,000
Less ineligibles	($700,000)	($600,000)
Eligible collateral	$3,300,000	$2,000,000
Advance rate	85%	50%
Availability by class	$2,805,000	$1,000,000
Gross availability: $3,805,000
Less lender reserves (dilution, disputes): ($150,000)
Net borrowing base: $3,655,000
Loan balance outstanding: $3,400,000
Excess availability: $255,000

Notice how much work the ineligibles did. Gross collateral was $6,600,000 and the borrower can draw $3,655,000, a little over half. Nothing improper happened; that gap is the ordinary operation of a properly structured facility.

What are advance rates on accounts receivable and inventory?

Advance rates express how much the lender will lend against a dollar of eligible collateral, and they track how reliably that collateral converts to cash. Receivables are a promise from a creditworthy third party and convert quickly. Inventory has to be sold first, and in a liquidation it rarely fetches cost.

Collateral	Typical advance rate	Why
Eligible accounts receivable	70% to 85%, occasionally up to 90%	Short conversion cycle; high-quality business-to-business receivables sit at the top of the range
Eligible inventory	20% to 65% of cost	Must be sold to become cash; rate reflects marketability and liquidation value
Finished goods vs raw materials	Finished goods advance higher	Work in process has almost no standalone liquidation value

These ranges follow the OCC's Comptroller's Handbook guidance on accounts receivable and inventory financing. A lender advancing 90% against receivables is signaling real confidence in the quality of the account debtors, the borrower's collection history and low dilution.

What are ineligibles in a borrowing base?

Ineligibles are the collateral the lender will not lend against, because in a workout it could not reliably collect them. Every credit agreement defines its own list, but the categories recur:

Aged receivables. Invoices past a stated age, commonly 90 days from invoice date, drop out entirely.
Cross-aging. If more than a set percentage of one customer's balance is past due, the entire balance for that customer becomes ineligible, not merely the aged portion. This clause surprises borrowers more than any other.
Concentration limits. Exposure to a single customer above roughly 10% to 20% of the receivables base is excluded, or advanced against at a reduced rate.
Affiliate and intercompany receivables. Money owed by related entities is not an arm's length obligation.
Contra accounts. Where a customer is also a supplier, they can set off what they owe, so that portion is excluded.
Foreign receivables. Excluded unless supported by credit insurance or an acceptable letter of credit, because enforcement across borders is impractical.
Government receivables. Excluded unless the borrower has complied with the Assignment of Claims Act.
Disputed, consigned or bill-and-hold items. Anything where the sale is not final and collectible.

Dilution deserves separate attention. It measures the gap between what is invoiced and what is actually collected, through credit memos, returns, discounts and write-offs. A borrower with 12% dilution is delivering 88 cents of cash for every dollar of receivables, and lenders respond by cutting the advance rate or holding a reserve.

How often must a borrowing base certificate be submitted?

Monthly is the common baseline, delivered within 15 to 30 days of month end alongside a receivables aging and an inventory report. Facilities with higher risk, tighter availability or faster asset turns move to weekly, and borrowers drawing daily on a revolver may certify daily. The credit agreement sets the frequency, and it often steps up automatically when excess availability drops below a stated threshold or a financial covenant is breached.

Frequency is a risk control. The longer the gap between certificates, the longer a deteriorating collateral position stays invisible, and the more the borrower can draw against receivables that have already gone bad. Field exams and third-party collateral audits sit alongside the certificate for exactly that reason: the certificate is what the borrower says, and the field exam is what the lender verifies.

What happens if the borrowing base falls below the loan balance?

The borrower is over-advanced, meaning it has drawn more than the collateral now supports. Nearly every asset-based credit agreement requires an immediate mandatory prepayment of the shortfall, typically within one to three business days of the certificate that reveals it.

An over-advance is dangerous precisely because it arrives at the worst moment. A borrowing base shrinks when receivables age out, when a large customer stops paying, or when inventory stops turning. Those are the same conditions that drain cash. The borrower is asked to repay the lender exactly when it can least afford to, which is why over-advance events so often precede a covenant default. A lender that spots a deteriorating trend across successive certificates has time to act. One that reads a single certificate in isolation does not. The same logic applies to loan covenant compliance monitoring: the trend across periods carries the signal.

Where the work actually goes

Preparing and reviewing a borrowing base certificate is document work. The receivables aging has to be reconciled to the general ledger, the ineligibles recalculated against the current definitions, the inventory report tied to the perpetual ledger, and the whole thing checked against last period. Borrowers do this in spreadsheets. Lenders re-derive it in different spreadsheets, and the two rarely agree on the first pass.

Some lenders shortcut this by pulling the receivables and ledger detail straight from the borrower's accounting system rather than from documents, a data-source trade-off we weigh on our Validis alternative page.

The reconciliation gets faster when the underlying detail is structured rather than retyped. Teams that need the invoice-level detail behind a receivables aging in a spreadsheet spend less time keying and more time testing the ineligibles, which is the part that requires judgment.

On the credit side, the borrowing base is only one view of the borrower. It says what the collateral supports today, not whether the business generates enough cash to service the debt, which is why lenders run collateral and cash flow analysis together. Our comparison of asset-based lending vs cash flow lending explains where each test governs, and LenderAnalyzer's loan underwriting software spreads the financial statements and analyzes the operating account behind them, so the collateral report and the cash flow tell a consistent story. Lenders financing receivables directly will also want the underwriting software for factoring companies, which handles the same aging and concentration analysis from the funder's side.