Borrowing Base
Definition
A borrowing base is the amount a lender allows a borrower to draw based on eligible collateral, advance rates, concentration limits, and reserves. In asset-based lending, warehouse facilities, receivables finance, and marketplace private credit, the borrowing base is usually recalculated from collateral reports rather than fixed at closing.
Why it matters
The borrowing base is often the real credit limit. A deal can advertise a large facility size while actual availability shrinks if receivables age, inventory becomes ineligible, obligor concentrations breach limits, collateral marks decline, or lender reserves increase. Investors should read the borrowing base mechanics because they determine whether the collateral package is actively protecting the note or merely described in broad terms.
Common misconceptions
- •Facility size is not the same as borrowing availability.
- •A borrowing base is not static; it can move daily, weekly, or monthly with collateral performance.
- •High collateral value does not help if the collateral fails eligibility tests or is subject to reserves.
Technical details
Core formula
A typical formula is: borrowing base = eligible collateral x advance rate - reserves. Different collateral pools can have different advance rates, such as receivables at 80-90%, inventory at 40-65%, and equipment at a value tied to orderly liquidation.
Eligibility comes before the advance rate. A $10 million receivable pool with $2 million of aged or disputed invoices may have only $8 million of eligible receivables, and then the advance rate applies to that smaller base.
Reserves are lender-controlled reductions for taxes, rent, dilution, disputes, concentration risk, chargebacks, shipping claims, or other priority claims that could reduce recoveries.
Where to diligence it
Look for borrowing base certificates, collateral reports, security agreements, credit agreements, PPM supplements, and platform credit snapshot tables.
Ask who prepares the report, how often it is delivered, whether the lender can independently verify collateral, and what happens after a borrowing base deficiency.
For marketplace notes, check whether investors are exposed to the direct borrower, a participation interest, a series issuer, or a warehouse structure that relies on a borrowing base upstream.
Stress behavior
Borrowing bases can create protective deleveraging when collateral weakens, but they can also force a liquidity squeeze. If the borrower is over-advanced, it may need to repay immediately, pledge additional collateral, or accept a default.
In stressed deals, the key question is whether the borrowing base was enforced before losses grew or waived repeatedly until the collateral cushion was gone.