Asset-Based Lending Explained: How ABL Works, the Borrowing Base, and What It Costs
By Zolvo · 6 min read
Asset-based lending is the backbone of middle-market commercial finance. When a growing company needs more working capital than its earnings alone would justify, but it holds real, liquid assets, receivables, inventory, sometimes equipment, an asset-based loan lets it borrow against those assets rather than against its cash flow. That single shift, from lending on profitability to lending on collateral, is what makes ABL work for companies that are asset-rich but cash-flow-constrained: fast growers, turnarounds, seasonal businesses, and cyclical manufacturers. This guide explains how an ABL facility is structured, how the borrowing base is built and monitored, what it costs, and why the servicing behind it is the whole game.
What asset-based lending is
Asset-based lending is a revolving line of credit secured by a company's assets, most commonly its accounts receivable and inventory. Instead of setting a fixed loan amount, the lender ties the available credit directly to the value of the collateral: as receivables and inventory rise, borrowing capacity rises with them, and as they fall, capacity contracts. It is usually structured as a revolving credit facility, so a business draws and repays continuously as its working capital needs move.
The defining feature is that the collateral, not the borrower's profit, sets the loan size. A cash-flow lender asks how much a company earns; an asset-based lender asks how much sellable collateral it holds and how reliably that collateral converts to cash. This is why ABL suits businesses that a cash-flow lender would decline, and why the entire discipline centers on measuring and monitoring collateral accurately.
The borrowing base is the heart of ABL
Everything in an asset-based facility runs through the borrowing base, the calculated amount a business can borrow at any given moment. The lender does not lend against the face value of the collateral. It advances a conservative percentage of eligible assets, and the two words that do the work are eligible and advance.
Not all collateral counts. Lenders separate eligible receivables from ineligible receivables, excluding invoices that are too old, owed by related parties, disputed, or concentrated in a single risky customer. Then they apply an advance rate to what remains, commonly around 80 to 85 percent on quality receivables and considerably less on inventory, which is harder to sell. The result, tracked through a borrowing base certificate the borrower submits regularly, is the real credit available. Our borrowing base calculator shows how eligibility rules and advance rates translate into availability.
Two forces constantly erode that base. Dilution, the gap between invoiced and collected amounts from credit memos, disputes, and returns, reduces what receivables are really worth, and our dilution calculator quantifies it. Concentration, too much of the collateral resting on one customer, caps how much of that exposure counts; our concentration limit calculator models the effect. Both are why the borrowing base is recalculated continuously rather than trusted from closing.
How lenders control and verify the collateral
Because the loan is only as good as the collateral behind it, asset-based lenders build in control and verification that cash-flow lenders do not need. Many ABL facilities route customer payments through a lockbox, a controlled account the lender monitors, so collections are visible and can be applied against the loan. Lenders periodically send examiners on-site for a field examination, auditing the receivables and inventory to confirm the collateral reported on the borrowing base certificate actually exists and is valued correctly. On real estate or equipment collateral, a loan-to-value discipline governs the advance just as it does the receivables and inventory.
This control apparatus is what separates ABL from ordinary lending. The lender is not making a one-time credit decision; it is running a continuous verification loop on a pool of collateral that changes every single day.
ABL versus factoring
ABL and factoring both turn receivables into working capital, but they are structurally different, and the choice matters. In an asset-based loan the business borrows against its receivables and keeps ownership and collection of them; in factoring it sells the invoices outright and the factor collects. The full comparison of ABL versus factoring comes down to control, cost, and size: ABL is usually cheaper and less intrusive and suits larger, established borrowers, while invoice factoring is easier to obtain, funds faster, and suits smaller or younger companies that value speed over cost. Many businesses graduate from factoring to ABL as they scale.
What ABL costs and where it fits
An ABL facility is priced with interest on the outstanding balance plus fees, an unused-line fee, servicing and collateral-monitoring fees, and field-examination costs. It is generally cheaper than factoring or a merchant cash advance because the lender's risk is mitigated by tightly controlled collateral, but it carries more monitoring and reporting obligations than an unsecured line. It fits asset-rich, growing, or transitional companies, distributors, manufacturers, staffing firms, and businesses working through a turnaround, that need flexible working capital scaled to their assets and can handle the reporting discipline that comes with it.
For the lender, that reporting discipline is the business. Recalculating borrowing bases, verifying certificates, monitoring dilution and concentration, reconciling lockbox collections, and scheduling field exams across a portfolio is an enormous, unforgiving operational load, and it is exactly where servicing infrastructure decides whether an ABL book is profitable or leaks value. For how lenders secure and monitor collateral in general, see our guide on how lenders secure a commercial loan, and for the metrics tracked over a loan's life, the key metrics lenders underwrite and monitor.
Frequently asked questions
What is asset-based lending?
Asset-based lending is a revolving line of credit secured by a company's assets, most often its accounts receivable and inventory. The amount a business can borrow is tied to the value of that collateral rather than to a fixed loan amount or the borrower's cash flow, so borrowing capacity rises and falls with the collateral. It suits asset-rich companies that need more working capital than their earnings alone would support.
How is the borrowing base calculated?
The borrowing base is the eligible collateral multiplied by an advance rate. Lenders first exclude ineligible assets, such as receivables that are too old, disputed, from related parties, or overly concentrated in one customer, then advance a conservative percentage of what remains, commonly 80 to 85 percent on quality receivables and less on inventory. The borrower reports the collateral on a borrowing base certificate, and the lender recalculates availability continuously.
What is the difference between asset-based lending and factoring?
In asset-based lending, a business borrows against its receivables and keeps ownership and collection of them. In factoring, the business sells its invoices to a factor, which then collects from the customers. ABL is generally cheaper and less intrusive and suits larger, established borrowers, while factoring is easier to qualify for and funds faster, making it common for smaller or younger companies. Businesses often move from factoring to ABL as they grow.
Why do asset-based lenders require field examinations?
A field examination is an on-site audit of a borrower's receivables and inventory that confirms the collateral reported on the borrowing base certificate actually exists and is valued correctly. Because an ABL facility lends against collateral that changes daily, lenders verify it periodically to protect against overstated assets, dilution, and fraud. Combined with lockbox control of collections, field exams are how the lender keeps the reported collateral honest.
Related guides
Related reading: invoice factoring, purchase order and inventory financing. For the full map of commercial financing options, see the types of commercial financing.