What it means
In an asset-based lending facility, the loan size is not a fixed number agreed once at signing. Instead the lender says it will lend against a defined pool of collateral, and the company's borrowing capacity moves with the value and quality of that pool month by month or even weekly.
Two adjustments do the work. Eligibility rules strip out collateral the lender does not trust, such as invoices more than 90 days old, balances owed by related parties or slow-moving inventory, and advance rates then discount what remains to leave a cushion if the assets have to be liquidated.
Advance rates reflect how easily an asset converts to cash. Good quality receivables typically attract 80% to 90%, finished goods inventory perhaps 50% to 60%, and raw materials or work in progress considerably less or nothing at all.
The company proves its position through a borrowing base certificate, usually a monthly submission signed by an officer showing eligible balances, exclusions and the resulting availability. Getting this wrong is serious, because an inaccurate certificate can be a default event in its own right.
The critical nuance is behaviour under stress. Precisely when a business is struggling, its receivables age, its inventory turns slower and its borrowing base shrinks, so credit availability contracts at the moment the company needs it most.
In practice
Real-world examples
Example 1
A seasonal garden products wholesaler builds inventory each winter and watches its borrowing base rise as stock arrives, then sees it swing towards receivables in spring as the stock ships and invoices are raised. The facility flexes with the season without renegotiation.
Example 2
An engineering services firm loses eligibility on $1,200,000 of receivables when its largest customer disputes a milestone. Availability drops overnight, and the finance director has to accelerate collections elsewhere to stay within the base.
Example 3
A food manufacturer negotiates an inventory advance rate of 55% rather than the lender's opening offer of 45% by commissioning an independent appraisal showing strong resale values. The extra ten points add roughly $400,000 of availability on a $4,000,000 inventory pool.
Think of it
Think of a pawnshop loan where the lender checks the value of your watch or gold ring before handing over cash. A borrowing base is simply that same idea applied to a whole business, using invoices and stock instead of jewellery as collateral.
Formula
Calculation
Borrowing base = (eligible receivables x receivable advance rate) + (eligible inventory x inventory advance rate) - reserves
Availability = the lower of the borrowing base and the facility limit, minus amounts already drawn and letters of credit outstanding
A distributor has $4,000,000 of eligible receivables at an 85% advance rate and $2,500,000 of eligible inventory at a 50% advance rate, with $250,000 of reserves for disputed items and accrued rent.
Receivables contribute $4,000,000 x 85% = $3,400,000, and inventory contributes $2,500,000 x 50% = $1,250,000, so the gross base is $3,400,000 + $1,250,000 = $4,650,000. After reserves the borrowing base is $4,650,000 - $250,000 = $4,400,000.
The facility limit is $5,000,000, so the base is the binding constraint at $4,400,000. With $3,900,000 already drawn, excess availability is $4,400,000 - $3,900,000 = $500,000, and if slow collections pushed $700,000 of receivables past the eligibility cut-off, the base would fall by $700,000 x 85% = $595,000 and the company would immediately be over-advanced.Case study
Seen in the real world
Larkspur Components is a fictional electronics distributor used purely as an illustrative example. It ran a $6,000,000 asset-based facility and for two years treated the monthly borrowing base certificate as a routine administrative chore delegated to a junior accountant.
When one large customer slipped from 45-day to 100-day payment behaviour, roughly $900,000 of receivables crossed the 90-day eligibility line in a single month. At an 85% advance rate the borrowing base fell by $765,000, and because Larkspur was drawn close to its ceiling, it became over-advanced and technically in default.
In this illustrative outcome the lender granted a waiver but tightened the reporting to weekly. Larkspur responded by building a rolling forecast of its own borrowing base, projecting eligibility 13 weeks ahead rather than reporting it after the fact, which turned an accounting formality into a genuine cash planning tool.
Watch out
Common mistakes
- Treating the facility limit as the amount you can actually borrow. The borrowing base is usually the lower of the two, so the headline facility size can badly overstate real availability.
- Ignoring concentration limits. Many facilities cap how much of the eligible pool can come from any one customer, so a dominant client can be partially excluded even when it pays perfectly.
- Preparing the borrowing base certificate carelessly. Overstating eligible collateral, even innocently, can constitute a default and damage the lending relationship permanently.
Questions
People also ask
How often is a borrowing base recalculated?
Most facilities require monthly certificates, though weekly or even daily reporting is common for higher-risk borrowers or during covenant stress.
What are reserves in a borrowing base?
Deductions the lender takes for expected claims against the collateral, such as unpaid rent, tax liabilities, customer credits or disputed invoices.
Can advance rates be renegotiated?
Yes, particularly after a field examination or appraisal that demonstrates better collateral quality, though lenders can also reduce them if performance deteriorates.