FILO Tranches and Over-Advance Facilities: How ABL Stretches Beyond the Borrowing Base

The Liquidity Gap

The standard middle-market ABL borrowing base produces availability roughly equal to the lender's risk box: 80 to 85 percent of eligible AR, 50 to 65 percent of inventory cost or NOLV, plus equipment and real estate at appraised liquidation values. For most healthy borrowers that capacity is sufficient. For others, it is not. A retailer entering peak season with three months of inventory build, a manufacturer financing a major equipment installation, a sponsor closing on an LBO with tight day-one liquidity -- in each case, the senior ABL revolver alone produces a number that does not work.

The market has two main structural answers to that gap. The first is the over-advance facility, where the ABL lender extends additional advance against the existing collateral pool, typically on a temporary or seasonal basis. The second is the FILO tranche -- first-in, last-out -- where a separate lender takes a junior tranche of the same collateral pool, providing additional capacity at a higher rate than the senior revolver.

Both structures stretch capacity beyond what the senior ABL alone would produce. They are not interchangeable. The over-advance is a senior product layered on top of the borrower's existing relationship; the FILO is a separate tranche, typically separately underwritten, separately documented, and separately priced. Sponsors and CFOs evaluating their options need to understand the mechanics and the trade-offs cold.

At Don Clarke Enterprises we have placed and structured FILO and over-advance solutions across multiple market cycles. Donald Clarke founded Asset Based Lending Consultants in 1986, was inducted into the SFNet Hall of Fame in 2021, and authored Asset Based Lending Disciplines -- the first textbook on the discipline. He has trained more than 5,000 lending professionals at GE Capital, JP Morgan Chase, Lloyds, and Barclays on these exact structures. We do not consult. We execute.

The FILO Tranche: How It Works

A FILO -- first-in, last-out -- is a separate loan tranche layered behind the senior ABL revolver, sharing first-priority collateral with the senior lender but subordinated in the payment waterfall. The name describes the cash flow mechanics: in the ordinary course, daily collections from the lockbox apply to pay down the senior ABL first ("first in"); the FILO is repaid only from collateral proceeds after the senior is fully repaid ("last out") in a liquidation.

The structure delivers two outcomes simultaneously. The borrower gets incremental availability beyond what the senior ABL alone would extend -- often an additional 10 to 25 percent of the eligible borrowing base, sometimes more in deals where the FILO lender takes a deeper view on collateral. The senior ABL lender keeps a comfortable risk position because the FILO sits in front of it on first-loss exposure to the working capital collateral.

The ordinary-course cash flow mechanics are worth understanding. Even though the FILO is "last out" in a liquidation, daily lockbox collections in the ordinary course pay the senior ABL revolver down first. The FILO functions as a more term-loan-like layer below the revolver -- it does not turn over with daily collections the way the revolver does, and so behaves like a separate, longer-duration tranche even though it is secured by the same working capital collateral. That structure is exactly why senior ABL lenders are increasingly comfortable bringing FILO partners in: their most liquid exposure is continually refreshed through daily sweeps, while the FILO sits underneath as a stable layer absorbing more of the collateral volatility.

FILO Pricing

FILO pricing reflects the additional risk. Senior ABL revolvers in the middle market typically run SOFR plus 175 to 300 basis points depending on credit. FILO tranches typically run 300 to 600 basis points wider than the senior, landing at SOFR plus 500 to 900 basis points in most middle-market deals. Some FILO structures carry PIK toggles or step-up features that increase the effective rate over time. The blended cost of capital across the senior plus FILO is typically meaningfully lower than a unitranche or mezzanine alternative would produce for the same incremental capacity, which is the core economic argument for the structure.

Sizing is driven by collateral coverage. FILO lenders look at the same eligible borrowing base the senior ABL lender does, then size their tranche based on the residual collateral value above the senior advance rate. A senior advancing at 85 percent of eligible AR plus 60 percent of NOLV inventory leaves headroom in the collateral; the FILO tranche sizes against that headroom and typically lifts effective combined advance rates to the high 90s on AR and 70 to 80 percent on inventory NOLV.

The Over-Advance Facility: How It Works

Over-advance facilities are a different structural answer to the same problem. Instead of bringing in a separate FILO lender, the senior ABL lender extends additional capacity on top of the standard borrowing base -- typically on a temporary or seasonal basis. The over-advance is documented within the existing credit agreement as a separate sub-facility or as a defined permitted excess, with its own advance limit, its own amortization schedule, and often its own pricing.

The most common over-advance structures are:

• Seasonal over-advances. Common in retail and consumer products. The lender allows availability to exceed the borrowing base by a defined amount during the inventory-build season (typically July through October for holiday retail), with mandatory paydown to within the borrowing base by a defined date (usually January 31 or February 28).
• Term over-advances. A defined dollar amount of additional advance over the borrowing base, amortized over twelve to twenty-four months. Often used in acquisition financing or to fund a specific capital project.
• Standby or accordion over-advances. A pre-negotiated right to draw above the borrowing base, available for a defined period, with notice requirements and conditions to drawing.

Pricing on over-advances is typically 100 to 300 basis points wider than the senior revolver rate. The senior lender is taking incremental risk by stretching the advance rate, but is not taking the same kind of risk the FILO lender takes -- the senior still controls collateral and remedies, and the over-advance is amortized away on a defined timeline rather than sitting underneath as a permanent layer.

Over-Advance Conditions and Amortization

Every over-advance has covenants and conditions attached. Standard structures include: (a) a covenant that the over-advance balance amortizes to zero by a defined date or on a defined schedule; (b) a tighter springing FCCR test or other financial covenant during the over-advance period; (c) blocked-account or hard cash dominion during the over-advance period; (d) accelerated reporting obligations (often weekly borrowing base certificates rather than monthly); and (e) cleanup periods requiring the borrower to be at or below the standard borrowing base for a defined window each year.

The over-advance is the right tool for borrowers whose excess capacity needs are temporary, well-defined, and supported by predictable cash flow back to the standard borrowing base. The structure trades higher operational discipline (tighter monitoring, stricter covenants, hard dominion) for the ability to stretch capacity without bringing in a separate lender. The deeper guide on cash dominion covers the operational side of the trade-off.

FILO vs. Over-Advance: Which Fits

The right structure depends on the duration and nature of the capacity gap.

Over-advance fits when:

• The capacity need is temporary or seasonal and predictable.
• The borrower has a strong existing senior ABL relationship that can be expanded.
• The borrower can operate under tighter monitoring and dominion during the over-advance period.
• The amortization schedule fits the borrower's cash flow and collateral generation.

FILO fits when:

• The capacity need is permanent or long-term -- supporting growth, an acquisition, or a structural change in working capital intensity.
• The borrower wants to preserve revolver flexibility rather than amortize incremental capacity.
• The senior ABL lender will not stretch its own advance rate but will accept a FILO partner behind it.
• The borrower can absorb higher pricing on the incremental tranche in exchange for permanent capacity.
• The transaction supports a unitranche-replacement narrative -- senior ABL plus FILO at a blended rate that beats unitranche or mezzanine alternatives.

Acquisition financing is one of the cleanest use cases for FILO -- it provides the additional day-one liquidity that often makes ABL workable for an LBO. We covered this dynamic in detail in our ABL acquisition financing guide; the FILO structure is one of the principal reasons ABL has gained share in mid-cap LBO financing over the last decade.

Documentation and Intercreditor Considerations

FILO documentation can be handled two ways. The simpler structure is a single credit agreement with separate tranches, where the senior revolver and the FILO term loan share the same agent, the same collateral package, and the same security agreement, with the waterfall and payment priority defined inside the credit agreement itself. This is most common when the senior ABL lender brings in a FILO partner as part of a structured deal at signing.

The more complex structure is separate credit agreements with a stand-alone intercreditor agreement governing the relationship between the senior ABL and FILO lenders. This is more common when the FILO is added later, or when the FILO lender is a non-bank that has its own preferred form of documentation. The intercreditor agreement covers payment priority, lien priority, voting and amendment rights, remedies, and DIP financing -- the same body of issues we covered for senior/junior ABL/term-loan structures in our ABL intercreditor agreement guide, applied within the same collateral pool.

Over-advance documentation lives entirely within the existing credit agreement. The over-advance is a defined sub-facility, an exception to the borrowing base availability test, or a defined permitted excess, with its own conditions, amortization, and pricing. Documentation complexity is meaningfully lower than a FILO. The trade-off is that the over-advance lives inside the senior ABL credit agreement, which means amendments to the over-advance terms typically require senior ABL lender consent under the same amendment provisions that govern the rest of the agreement.

Lender Map

Most major ABL lenders offer over-advance facilities for their existing borrowers. Whether they will offer them, and at what size, is a function of credit relationship, collateral quality, and current credit appetite.

The FILO lender universe is more specialized. Traditional bank ABL desks generally do not extend FILO tranches against their own collateral; the FILO product more often comes from a separate non-bank specialist. Specialty finance firms, BDCs, private credit funds with ABL strategies, and certain insurance balance sheets are the most common FILO providers in middle-market deals. Some sponsors use the same direct lender for both the term loan in their capital stack and the FILO behind their ABL. The deeper lender taxonomy in our how to choose the right ABL lender guide applies directly to FILO partner selection.

Why DCE

FILO and over-advance structures are exactly the kind of work where pattern recognition pays off. We know which senior ABL desks pair with which FILO providers, which senior lenders will stretch their own advance rate before bringing in a FILO partner, and where the pricing concessions and structural give-backs typically land. We have negotiated FILO intercreditor agreements with most of the active FILO desks in the market and seen multiple cycles of how those structures perform in workout. Don's four decades in the discipline mean the senior credit officers underwriting these tranches have often trained on material he developed.

If you are looking at a capacity gap on your existing ABL facility, structuring an LBO that needs incremental day-one liquidity, or evaluating unitranche versus ABL-plus-FILO alternatives, we can help. Our work runs from initial sizing through term sheet negotiation, lender selection, and post-closing facility management.

We do not consult. We execute.