Guide

Revolving credit facility explained

Harbor Retail entered 2026 with $340 million of revenue, $42 million of cash on hand, and a $150 million revolving credit facility marketed as “fully available.” The CFO's liquidity model assumed peak working capital needs of $95 million in Q4 — well inside the commitment. Then a supplier shifted to shorter payment terms, holiday inventory landed six weeks early, and accounts receivable stretched from 38 to 51 days. Eligible collateral under the borrowing base fell while draws rose. By October, gross availability was $150 million but effective availability after the base calculation and a $25 million minimum liquidity covenant was $18 million. Harbor drew $132 million, tripped a springing fixed-charge coverage test, and paid a 25-basis-point pricing-grid step-up plus $400,000 in waiver fees to avoid a default.

A revolving credit facility (revolver) is a committed bank line that companies draw, repay, and re-borrow for short-term liquidity — typically to fund inventory, receivables, payroll, and seasonal swings. Unlike a term loan, principal amortizes only when the borrower chooses (subject to maturity and cleanup periods). Revolvers sit at the top of most corporate capital stacks: senior secured, floating-rate, and often the first place lenders tighten when performance slips. This guide explains commitment mechanics, borrowing-base formulas, covenant design, pricing grids, the Harbor Retail walkthrough, a technique decision table versus term loans and asset-based structures, common pitfalls, and a treasury checklist.

What a revolving credit facility is

A revolving credit facility is a loan agreement that gives a borrower access to a maximum commitment for a defined period (usually three to five years). The borrower can:

Draw — borrow up to available capacity via SOFR (or prime-based) advances, often in $500k–$5M increments.
Repay — return principal at any time without prepayment penalties (unlike most term loans).
Re-borrow — access repaid amounts until maturity, when the facility typically must be refinanced or terminated.
Issue letters of credit — many revolvers include an LC sublimit that reduces availability dollar-for-dollar.

Revolvers fund operating liquidity. Capital expenditures, acquisitions, and dividends usually require separate term debt, equity, or specific baskets carved in the credit agreement. In an LBO capital structure, the revolver is the liquidity backstop; term loans fund the purchase price.

Commitment, utilization, and fees

Three numbers matter for every revolver:

Total commitment — the maximum the bank group will lend (e.g., $150M).
Outstanding borrowings — principal currently drawn plus LC exposure.
Availability — commitment minus borrowings, minus any borrowing-base deficiency, minus reserves.

Borrowers pay interest on utilized amounts (SOFR + spread, often with a 0–10 bps credit adjustment) and an unused commitment fee on undrawn capacity — typically 25–50 bps annually. A $150M revolver drawn to $40M with a 37.5 bps unused fee costs $412,500 per year on the $110M undrawn portion alone. High unused fees incentivize right-sizing commitments; undersized revolvers force expensive alternative funding when liquidity spikes.

Maturity and extension. Investment-grade revolvers often include one-year extension options subject to lender consent. Leveraged borrowers face “amend-and-extend” negotiations tied to EBITDA performance and covenant compliance.

Borrowing-base revolvers vs covenant-lite cash-flow revolvers

Not all revolvers calculate availability the same way:

Asset-based lending (ABL) borrowing base

Common for retailers, distributors, and manufacturers. Availability equals the lesser of commitment and a formula:

Eligible receivables × advance rate (often 80–90%) minus dilution reserves.
Plus eligible inventory × advance rate (often 50–65% for finished goods; lower for raw materials).
Minus reserves for rent, payroll, seasonal shrink, and concentration limits on large customers.

The base is recalculated weekly or monthly. If collateral value falls, availability shrinks even when the borrower has not drawn more — a base deficiency that can force mandatory prepayment.

Cash-flow revolvers (covenant-lite)

Common for sponsors and larger corporates with stable EBITDA. Availability equals commitment minus outstanding borrowings, with no asset formula. Lenders rely on incurrence covenants (limits on additional debt, liens, and dividends) and maintenance covenants that spring only when utilization exceeds a threshold (e.g., 35% of commitment). Springing tests protect lenders when the revolver is actually in use without constraining day-to-day operations when it is undrawn.

Covenants, pricing grids, and events of default

Revolver covenants fall into maintenance (tested quarterly) and incurrence (tested when taking an action):

Maximum leverage — Net debt / EBITDA cap, often 3.0–4.5× for middle-market borrowers.
Minimum fixed-charge coverage — (EBITDA − capex − cash taxes) / (interest + scheduled amortization + dividends) ≥ 1.0–1.25×.
Minimum liquidity — cash plus revolver availability ≥ floor (Harbor's $25M requirement).
Restricted payments basket — dividends and buybacks permitted only within builder amounts tied to cumulative EBITDA.

Pricing grids tie SOFR spreads to leverage tiers. Harbor's grid stepped from SOFR + 200 bps below 2.5× leverage to SOFR + 225 bps above 3.0×. A covenant waiver often comes with a grid step-up, higher fees, or tighter baskets — the economic cost of a near-default.

Events of default include missed payments, covenant breaches, material adverse change (MAC) clauses, cross-defaults to other debt, and change of control. Revolver lenders are typically first to accelerate because their facility is short-dated and fully secured.

How revolvers fit the capital stack

In priority of payment and collateral, a standard corporate stack looks like:

Revolving credit facility — senior secured, first on working-capital assets.
Term loan A / B — senior secured on the same collateral package, with scheduled amortization.
Second lien or mezzanine — subordinated debt with higher coupons and equity kickers.
Common equity — residual claim.

Revolvers are cheaper than term debt on a spread basis because they are short-dated and often undrawn, but unused fees and upfront arrangement fees (50–100 bps on commitment) raise the all-in cost. For a seasonal borrower that draws 60% of peak for three months, the effective annual rate on drawn amounts must include the unused fee spread across the full year.

Harbor Retail: when availability is not the commitment

Harbor's $150M revolver was marketed with a 85% receivables / 60% inventory advance formula. September borrowing-base certificate:

Eligible AR: $118M × 85% = $100.3M
Eligible inventory: $142M × 60% = $85.2M
Gross borrowing base: $185.5M → capped at $150M commitment
Outstanding borrowings + LCs: $132M
Availability before liquidity covenant: $18M
Minimum liquidity covenant: $25M (cash + availability)
Effective headroom: negative $7M — waiver required

Root causes: inventory ineligible due to aged SKUs (>$90 days), a 22% customer concentration cap that excluded a major account's receivables, and DSO stretch that inflated gross AR but not eligible AR. The treasury team had modeled commitment minus draws, not base minus covenant. After the waiver, Harbor tightened SKU aging policies, renegotiated supplier terms, and resized the 2027 renewal target to $175M with a lower inventory advance rate — accepting higher unused fees for true peak capacity.

Technique decision table

Structure	Best when	Strengths	Trade-offs
ABL borrowing-base revolver	Asset-heavy, seasonal, cyclical revenue	Lenders underwrite collateral, not just EBITDA; higher advances in upswing	Weekly certificates; availability shrinks with collateral quality
Cash-flow covenant-lite revolver	Stable EBITDA, sponsor-backed, low seasonality	Simple availability; springing covenants when undrawn	Lower commitment sizes; MAC risk in downturns
Term loan (instead of larger revolver)	Permanent capital need, acquisition, capex	Fixed amortization; no unused fees on drawn amount	Prepayment penalties; not reusable for WC swings
Factoring / supply-chain finance	Single-currency AR, fast setup, smaller firms	Off-balance-sheet options; quick liquidity	Higher all-in cost; customer notification in true factoring
Commercial paper + backstop revolver	Investment-grade issuers	Cheapest short funding	Requires A- rating; backstop reduces available capacity

Common pitfalls

Modeling commitment as availability — borrowing-base and LC sublimits reduce headroom below the headline number.
Ignoring eligibility definitions — aged inventory, cross-border AR, and concentration caps exclude collateral silently.
Underestimating unused fees — oversized commitments tax EBITDA when utilization is chronically low.
Springing covenant surprise — drawing above 35% triggers maintenance tests borrowers have not modeled quarterly.
LC footprint — trade letters of credit count against availability even when never drawn.
Maturity wall clustering — revolver and term loan maturing same year forces simultaneous refinancing risk.
Cross-default chains — a minor lease default can accelerate the entire bank facility.
Reporting lag — monthly base certificates mean treasury learns about deficiencies weeks after inventory aged out.

Treasury and credit checklist

Map peak working-capital need by month using DIO, DSO, and DPO scenarios.
Size commitment to peak draw plus 15–20% buffer, not average utilization.
Build a borrowing-base model with eligibility haircuts and concentration limits.
Stress-test springing covenants at 50%, 75%, and 100% utilization.
Include unused fees and upfront arrangement fees in all-in cost comparisons.
Track LC sublimit usage and trade-finance overlap with AR collateral.
Align revolver maturity with term-loan refinancing timeline.
Negotiate cure periods and equity-cure rights for maintenance breaches.
Document weekly availability reporting for ABL facilities.
Review credit agreement baskets before dividends, buybacks, or acquisitions.

Key takeaways

A revolver is committed liquidity you can draw, repay, and re-borrow — but availability is often less than the headline commitment.
Borrowing-base formulas tie availability to eligible collateral; cash-flow revolvers rely on springing covenants instead.
Unused commitment fees and pricing-grid step-ups are real costs — model them in liquidity forecasts, not just SOFR spreads on drawn amounts.
Harbor Retail shows why treasury must certificate the base monthly, not assume commitment minus outstanding borrowings.
Match facility type to business model: ABL for asset-heavy seasonality, covenant-lite for stable sponsor-backed cash flows.