When the Tariff Bill Lands in the Borrowing Base: ABL Mechanics Under Import-Cost Inflation

The first-order effect of the 2025 tariff escalation on middle market manufacturing has registered most visibly in income statements, but its second-order effect — reshaping the asset-based lending market that finances working capital cycles — is equally consequential and considerably less discussed. Understanding both requires starting with the macroeconomic foundation before descending to the borrowing-base mechanics that determine whether a manufacturer can fund its operations on any given Tuesday.

The tariff regime assembled through 2025 is, by any historical measure, a structural break. The Yale Budget Lab’s September 2025 analysis found that new 2025 tariff actions had raised the overall U.S. average effective tariff rate to 17.9 percent — the highest level since 1934 — from a pre-2025 baseline of roughly 2.4 percent.¹ The manufacturing sector, which imports nearly 19 percent of its total inputs, faces cost pressures that are proportionally larger than any other major sector of the economy. Federal Reserve researchers at the San Francisco Fed estimated that a full-passthrough 25 percent across-the-board tariff would raise investment-goods prices — equipment, tooling, production inputs — by approximately 9.5 percent, far outpacing the 2.2 percent consumption-goods effect.² Manufacturers are simultaneously the biggest tariff-cost absorbers and the least insulated from pass-through, because their customers are often constrained in their own pricing flexibility. Section 232 tariffs on steel and aluminum, reinstated and expanded under Proclamations 10895 and 10896 of February 10, 2025, have added a specific structural floor beneath input costs for metal-intensive producers that operates independently of whatever relief packages emerge from ongoing trade negotiations.³

How NOLV Takes the Hit Before the Borrower Does

Asset-based lending operates on a simple premise that becomes complicated quickly in an inflationary environment: lenders advance against the net orderly liquidation value of collateral, not its book value. The OCC’s Comptroller’s Handbook on Asset-Based Lending defines the standard — advance rates on inventory typically range up to 65 percent of book value or 80 percent of NOLV — and requires that advance rates reflect realistic liquidation scenarios rather than accounting carrying values.⁴ The mechanics establish a critical wedge: book value now reflects the full landed cost of imported inventory, including embedded tariff costs, while NOLV reflects what a liquidator can actually recover by selling that inventory into a market where buyers and competing suppliers can source the same goods tariff-free or at different tariff rates. The gap between those two numbers is the tariff-driven NOLV haircut, and it falls directly on borrowing-base availability.

The ABF Journal’s examination of inventory-as-collateral mechanics describes the structural logic: lenders rely on NOLV appraisals to set advance rates, and any factor that reduces realizable liquidation value — product-cycle risk, market illiquidity, origin restrictions — compresses availability relative to book value.⁵ Tariff-embedded carrying costs meet multiple ineligibility criteria simultaneously: they may create slow-moving or obsolete inventory if the cost base pushes pricing above market-clearing levels; they complicate country-of-origin determinations when inputs cross borders multiple times; and they introduce documentation requirements that borrowers without SKU-level origin tracking cannot satisfy. Field examiners conducting quarterly or semi-annual collateral reviews are now running separate NOLV tracks for tariffed versus untariffed inventory categories, and several have begun requiring documentary evidence of country of origin at the item level as a prerequisite to full advance-rate eligibility.

The SFNet Q2 2025 ABL Market Survey observed that tariff-induced distortions in inventory values were creating specific lender-side monitoring challenges: borrowers could present strong revenue performance and healthy inventory balances while the underlying collateral quality had quietly deteriorated because the book value no longer aligned with what a liquidator could recover.⁶ This dynamic is particularly acute in specialty categories — branded consumer goods, custom-fabricated industrial components, fashion-cycle products — where secondary market depth is thin even in normal conditions and tariff-driven cost inflation erodes margin on any forced sale. Fungible commodities and generic raw materials, which have deep secondary markets and are priced internationally, absorb smaller NOLV adjustments; the variation between categories has produced a quiet realignment in which lenders favor commoditized inventory over specialty inventory.

The Working-Capital Compression

The NOLV adjustment would be manageable if the underlying working-capital requirement were stable. It is not. The same tariff environment that reduced the advance rate against each dollar of inventory has simultaneously forced manufacturers to hold more inventory for longer. Tariff volatility through 2025 — rates shifting with each round of escalation, then negotiated pauses, then re-escalation — drove a defensive inventory accumulation strategy that the Deloitte 2026 Restructuring Outlook characterizes as one of the primary channels through which tariffs translated into downstream financial distress: “inventory dislocations, rerouting costs, softer demand, and procurement and logistics disputes.”⁷ Manufacturers with the storage capacity and balance-sheet flexibility to front-load imports ahead of announced tariff increases gained a temporary cost advantage, but at the cost of elevated working-capital requirements. Manufacturers without that flexibility faced the worst of both worlds: higher per-unit input costs and shorter effective operating windows before the next tariff adjustment forced another round of inventory strategy revision.

The ISM Manufacturing PMI data through late 2025 and into 2026 tracked this dynamic in real time. The ISM Prices Paid index registered elevated readings throughout the period, driven explicitly by steel and aluminum tariff pass-through into the full manufacturing value chain. Survey respondents consistently cited tariffs as the primary driver of both cost pressure and supplier delivery uncertainty, with the Supplier Deliveries index reflecting the disruptions that accompany tariff-driven import surges and the subsequent customs backlogs.⁸ The practical consequence for ABL borrowers was an inventory pile that was simultaneously larger by volume, more expensive by unit cost, and worth less per dollar as collateral — a combination that compresses availability in three directions at once.

ABL lenders have responded with a mix of structural accommodations and escalated monitoring. The most common accommodation has been the introduction of dynamic reserve structures — temporary borrowing-base adjustments timed to known tariff-driven inventory builds — that give borrowers incremental availability during the accumulation phase while preserving the lender’s ability to reduce availability if the inventory does not move through as projected. The monitoring escalation has taken the form of more frequent field exams, expanded reporting requirements for country-of-origin documentation, and tighter eligibility criteria for slow-moving inventory categories that tariff-elevated cost bases have pushed above normal velocity thresholds. For sponsors and CFOs, the practical consequence is that ABL facility maintenance has become substantially more operationally intensive than it was before 2025.

Distress Concentrations and the Credit Cycle

The tariff-driven ABL stress does not fall evenly across manufacturing subsectors. Yale Budget Lab’s sectoral analysis found that tariffs fall most heavily on metal products and electrical equipment, with motor vehicles and apparel also significantly affected — reflecting the import content of each sector’s production inputs.¹ Manufacturers in these categories face both the largest direct input-cost inflation and the sharpest NOLV compression on their tariff-embedded inventory. The Deloitte 2026 Restructuring Outlook identified industrials as one of three primary stress concentrations entering 2026, alongside consumer discretionary and health care, and noted that restructuring distress in manufacturing has been characterized by “slow-burn balance-sheet stress” rather than sudden liquidity collapses — a pattern consistent with the gradual compression of borrowing-base availability that the ABL mechanics produce.⁷

The Lincoln International Senior Debt Index data for Q3 2025 provides useful context on market-wide credit conditions: covenant defaults declined quarter-over-quarter to 3.2 percent but had increased 1.0 percent year-over-year, and the LSDI commentary noted explicitly that “the macroeconomic impact of higher tariffs has caused heightened global market volatility” with an uncertain forward outlook.⁹ For ABL-anchored manufacturing credits specifically, covenant defaults that originate in borrowing-base compression — availability covenants, minimum liquidity requirements — are structurally different from the operating-performance defaults that dominate cash-flow-lending distress. They can arrive quickly and without the early-warning signals that revenue or EBITDA deterioration provides, because the collateral value decline is driven by lender methodology changes rather than borrower performance.

What Renewal Now Requires

The ABL renewal cycle has changed in ways that are not yet fully reflected in how manufacturers and their advisors approach the process. Under pre-tariff conditions, a facility renewal was primarily a pricing and size negotiation driven by the borrower’s financial performance and the lender’s portfolio management goals. Under current conditions, it is also a collateral methodology review, a country-of-origin audit, and an inventory-NOLV stress test. Borrowers who arrive at renewal without having modeled the tariff impact on their borrowing base — separating tariff-embedded inventory from untariffed inventory, documenting origin at the SKU level, and applying the lender’s updated NOLV assumptions rather than prior-year advance rates — risk discovering a material availability gap at the worst possible moment in the negotiation cycle.

The SFNet ABL market data for full-year 2025 confirms that the market overall remained resilient, with bank ABL commitments stable at approximately $369.5 billion and non-bank commitments growing through the year.⁶ The structural health of the ABL market as a whole does not, however, distribute evenly to import-dependent manufacturing borrowers, who face a combination of collateral compression and working-capital expansion that has no obvious parallel in recent ABL history. The lenders best positioned to serve those borrowers are those whose field exam capacity, NOLV methodology, and collateral monitoring infrastructure can keep pace with tariff-driven volatility — not those whose systems were calibrated to a pre-2025 import-cost environment.

Conclusion

The tariff escalation of 2025 has produced two distinct financial stories for middle market manufacturers: a visible income-statement story of input-cost inflation and margin compression, and a quieter borrowing-base story of advance-rate adjustments, expanded ineligibles, and collateral documentation requirements that did not exist two years ago. The income-statement effects are well-documented and increasingly priced into valuations. The borrowing-base effects are less understood and, for manufacturers approaching facility renewal, potentially more immediately consequential. The asset class’s core discipline — collateral-secured lending against monitored, monetizable assets, priced to liquidation value rather than book value — is doing exactly what it was designed to do: reflecting the actual recoverable value of the collateral. For borrowers, that discipline is a constraint to be managed with advance planning, granular origin documentation, and direct engagement with lenders on reserve structures before the renewal window compresses the options. The manufacturers who model the borrowing-base impact before their lender does are the ones who arrive at renewal with a plan. The manufacturers who do not are the ones for whom renewal becomes a liquidity event.

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Footnotes

1. Yale Budget Lab — “State of U.S. Tariffs: September 26, 2025” (Average effective tariff rate 17.9%, highest since 1934; manufacturing imports ~19% of total inputs; long-run manufacturing output up 2.7% but construction down 3.7%.)
2. Federal Reserve Bank of San Francisco — Hobijn, Bart and Nechio, Fernanda, “The Effects of Tariffs on Inflation and Production Costs,” FRBSF Economic Letter 2025-12, May 19, 2025 (Full-passthrough 25% tariff raises investment-goods prices ~9.5% vs. ~2.2% for consumption goods; ~38% of investment-goods cost traceable to imports.)
3. Federal Register — “Adoption and Procedures of the Section 232 Steel and Aluminum Tariff Inclusions Process,” 90 Fed. Reg. 18,948 (May 2, 2025), citing Presidential Proclamations 10895 and 10896 of February 10, 2025 (Section 232 tariffs on steel and aluminum reimposed and expanded at 25%; all country exemptions eliminated effective March 2025.)
4. Office of the Comptroller of the Currency — Comptroller’s Handbook: Asset-Based Lending (Inventory advance rates typically up to 65% of book value or 80% of NOLV; appraisals must use NOLV as the standard for collateral valuation; advance rates lower than receivables because inventory must be sold before collected.)
5. Malhotra, Neha — “Examining The Eligibility of Inventory as Collateral in Asset-Based Lending Agreements,” ABF Journal, March 21, 2024(NOLV defined as liquidation value on day of appraisal; lender discounts NOLV by advance rate; slow-moving and obsolete inventory categories ineligible; SKU-level perpetual inventory reports are a prerequisite to inventory lending.)
6. SFNet Data Committee — “ABL Resurgence: New Client Growth, Stabilized Portfolios, and Cautious Optimism Mark Q2 2025” and “A Market of Contrasts: ABL Closes 2025 Strong Amid Slowing Growth and Structural Shifts,” The Secured Lender (Bank ABL commitments $369.5B Q4 2025; utilization ~39.4%; tariff-induced inventory distortions creating collateral monitoring challenges; borrowing bases dominated by receivables 42-60% and inventory 28-48%.)
7. Deloitte — “2026 Turnaround and Restructuring Outlook” (Industrials identified as key stress concentration entering 2026; tariffs drove distress via inventory dislocations, rerouting costs, softer demand; intermediate manufacturing input prices up 4.6%; Economic Policy Uncertainty Index peaked at 7,955 in April 2025.)
8. Institute for Supply Management — ISM Manufacturing PMI Reports, 2025-2026 (ISM Prices Paid elevated throughout 2025-2026; increases driven explicitly by steel and aluminum tariff pass-through across the manufacturing value chain; respondents cited tariffs as primary driver of cost pressure and supplier delivery uncertainty.)
9. Lincoln International — “Q3 2025 Lincoln Senior Debt Index” (Covenant defaults 3.2% Q3 2025, down Q/Q but up 1.0% year-over-year; spread 6.17% over SOFR, lowest since inception; commentary: “macroeconomic impact of higher tariffs has caused heightened global market volatility.”)