Asset-Based Lending for Construction Subcontractors: Progress Billing, Retainage, Bonding, and Receivable Eligibility

For specialty trade and subcontracting firms — electrical, mechanical, HVAC, plumbing, concrete, steel, drywall, glazing — the cash gap between performing work and getting paid is the defining financial problem of the business. You buy materials and pay crews this week; you bill at month-end against a schedule of values; the general contractor pays 30 to 60 days later, less retainage; and the retainage itself may not be released until the entire project reaches substantial completion months after your scope is done. Asset-based lending for construction subcontractors can bridge that gap — but construction receivables are among the most heavily scrutinized, reserved, and excluded collateral in the entire ABL market.

This guide explains, from the lender's chair, why construction accounts receivable are hard collateral, how progress billing and retainage change what is eligible, how bonding and lien rights interact with the lender's position, and what a subcontractor can do to maximize availability. It is educational and commercial in nature; it is not legal, tax, or investment advice, and the lien, bond, and trust-fund issues discussed below are legal matters you should review with qualified construction counsel.

Why construction receivables are hard collateral

An asset-based revolver advances against the liquidation value of your receivables — what the lender could collect if it had to step in. In most industries an invoice represents a completed, accepted delivery: the goods shipped, the customer owes the money, and the only real risk is creditworthiness and dilution. Construction is different in ways that directly attack collectibility:

• The receivable is conditional. A progress billing is a claim for payment for work performed to date, subject to inspection, certification, and acceptance. Until the work is certified, the "receivable" is really an unbilled or partially-earned claim.
• Payment often depends on a third party paying first. Pay-when-paid and pay-if-paid clauses tie your collection to whether the general contractor (GC) gets paid by the owner — a contingency outside your control and the lender's.
• A portion is contractually withheld. Retainage (commonly 5–10%) is held back on every billing until completion, so even a "current" invoice is only partially collectible now.
• Disputes are structural, not occasional. Change orders, back-charges, scope disagreements, and punch-list deductions are a normal part of every job, which means dilution runs higher than in a typical commercial AR book.
• Offset and lien-priority risk. Owners and GCs have setoff rights; sureties have subrogation rights; and competing mechanic's lien claimants can complicate who is owed what if a job goes bad.

None of this means construction firms can't get ABL financing — many do. It means the lender builds the borrowing base carefully and reserves against the specific risks. Understanding those mechanics is how you negotiate better availability. For the general framework of which invoices make the cut, start with our explainer on eligible vs. ineligible receivables in asset-based lending.

Progress billing, the schedule of values, and certification

Most commercial construction is billed on a schedule of values — the contract price broken into line items (mobilization, rough-in, fixtures, finishes, etc.). Each period you submit an application for payment, typically on AIA forms G702 (Application and Certificate for Payment) and G703 (Continuation Sheet), showing the percentage complete on each line and the amount earned to date, less previous billings and retainage.

From the lender's perspective, the critical question is: has this billing been certified and approved? A billing that the architect or owner's representative has certified — meaning the work to date is accepted — looks much more like a true, hard receivable. An application that is submitted but not yet certified is closer to an unbilled estimate. Many ABL lenders will:

• Make certified, approved progress billings eligible (subject to the usual aging and concentration tests), and
• Treat unbilled / uncertified amounts and pure cost-to-date accruals as ineligible, because there is no agreed, payable claim yet.

This is why disciplined, timely billing is not just good cash management — it directly drives how much of your receivable book is borrowable. A subcontractor that bills promptly, gets clean architect certification, and avoids carrying large uncertified balances will see a materially higher advance against the same revenue than one with sloppy or delayed billing.

Retainage: the holdback the lender usually excludes

Retainage (or retention) is the portion of each progress payment the owner or GC withholds — most commonly 5% or 10% — until the project reaches substantial or final completion. It exists to protect the owner against incomplete or defective work. For the subcontractor it is, in effect, a long-dated receivable that may not be collected for many months after your scope is finished.

Almost universally, ABL lenders treat retainage as ineligible for the borrowing base, for several reasons:

• It is not currently due — collection is deferred to completion, which can be a year or more out on large projects.
• It is contingent on satisfactory completion of the entire project, not just your work, so it carries completion and performance risk you don't control.
• Its aging doesn't behave like normal AR; a retainage balance can sit far past 90 days while being entirely "normal."

Some lenders will, for strong borrowers, advance a modest rate against billed and certified retainage that is contractually due within a defined window, but the conservative default is exclusion. The practical takeaway: model your availability on non-retainage AR, and treat retainage release as a separate, lumpy cash event rather than borrowable collateral. Pushing for prompt retainage release language and reduced retention percentages in your subcontracts is one of the highest-leverage things you can do for working capital.

Pay-when-paid, pay-if-paid, and conditional payment

Two contract clauses materially affect collectibility, and lenders read subcontracts to find them:

• Pay-when-paid generally sets the timing of payment — the GC pays you within a reasonable time after being paid by the owner — but does not eliminate the obligation if the owner never pays. Courts in many jurisdictions read these as timing provisions.
• Pay-if-paid attempts to make the owner's payment a true condition precedent — if the owner never pays, the GC arguably owes nothing. These shift the risk of owner non-payment onto you, and enforceability varies significantly by state.

Whether and how these clauses are enforced is a legal question for your counsel, not the lender. But economically, a receivable governed by a strong pay-if-paid clause is weaker collateral, because the lender's ultimate source of repayment depends on a party two steps removed. Expect closer scrutiny, and in some cases reserves, where pay-if-paid risk concentrates with a particular GC or project.

Bonding, surety subrogation, and the lender's position

On bonded projects — public work and many large private jobs — a surety issues payment and performance bonds. If the subcontractor defaults, the surety may step in to complete the work or pay claimants, and in doing so the surety acquires subrogation and equitable rights that can reach contract proceeds. This creates a potential priority contest between the surety and the ABL lender over the receivables and contract funds on bonded jobs.

Lenders manage this in a few ways: by carving bonded-job receivables out of the borrowing base or reserving against them, by negotiating intercreditor or subordination arrangements with the surety where the relationship is large, and by tracking which receivables arise from bonded versus unbonded work. The federal-contract analogue — where the government's payment process and the Assignment of Claims Act drive how a lender perfects and collects — is covered in our guide to ABL for government contractors and the Assignment of Claims Act; the bonding overlay on commercial construction raises similar "who has priority to the contract proceeds" questions.

Mechanic's lien rights — collateral and complication

Subcontractors generally have mechanic's lien rights against the improved property, plus potential claims against payment bonds and, in some states, trust-fund protections on construction proceeds. These rights are valuable — they are leverage for getting paid — but from a lender's standpoint they cut both ways. Your lien rights can support collection on your own receivables; but other claimants' liens (your sub-subcontractors, suppliers, laborers) can cloud title and complicate the flow of funds on a troubled job, and lien waivers exchanged for payment are part of the normal billing cycle.

Lenders will want to understand your lien-preservation discipline (notice deadlines, waiver practices) because a subcontractor that protects its lien rights is more likely to collect. Lien and trust-fund statutes vary widely by state and are squarely legal matters for construction counsel — flag them early rather than assuming a generic approach applies.

Dilution: change orders, back-charges, and disputes

Dilution — the gap between what you bill and what you ultimately collect — is the single most important driver of the advance rate against receivables, and construction dilution is structurally elevated. The usual culprits:

• Change orders performed before they are formally approved, then partially disallowed or repriced.
• Back-charges the GC imposes for cleanup, delays, or damage attributed to your crew.
• Punch-list and warranty deductions at closeout.
• Scope and quantity disputes on lump-sum and unit-price work.

A lender measures your historical dilution from your own books and credit memos and sizes a dilution reserve accordingly; high or volatile dilution lowers the advance rate. The mechanics of how that reserve is calculated are explained in our deep dive on how credits, returns, and disputes size the dilution reserve. The borrower lesson: get change orders approved and priced in writing before doing the work, document back-charge disputes promptly, and keep credit-memo activity clean — it pays back directly in availability.

Customer concentration on the GC roster

Many subcontractors run a handful of relationships with a few general contractors, which means concentration risk is common. If one GC represents 40–60% of your receivables, the lender's exposure to that single payer's solvency and payment behavior is high, and the borrowing base will reflect it through concentration caps (limiting how much of any one account counts as eligible) and sometimes payer-specific reserves. Our explainer on customer concentration in the ABL borrowing base walks through how those caps and reserves are set. Diversifying your GC base, or at least demonstrating long, clean payment histories with your anchors, helps loosen these limits.

How the advance rate and availability come together

Putting the pieces in order, here is roughly how a lender builds availability against a construction subcontractor's receivables: start with gross AR; remove retainage; remove unbilled/uncertified amounts; remove ineligibles (over-aged, affiliate, foreign, pay-if-paid-impaired, disputed, and bonded-job carve-outs where applicable); apply concentration caps; subtract the dilution reserve and any payable/lien-priority reserves; then apply the advance rate (often in the 75–85% range against the resulting eligible AR, lower where dilution or concentration is high). For the full walkthrough of that calculation, see how lenders calculate ABL advance rates and availability.

A preparation checklist for construction subcontractors

1. Bill promptly and get certified. Submit G702/G703 applications on schedule and chase architect/owner certification — certified billings are far more borrowable than uncertified ones.
2. Separate retainage in your reporting. Track billed-but-retained amounts distinctly so you and the lender can see true non-retainage AR at a glance.
3. Get change orders approved in writing first. Pricing and approving change orders before performing the work is the most effective way to cut dilution.
4. Map your bonded vs. unbonded work. Know which receivables sit behind a surety, and be ready to discuss intercreditor treatment on large bonded jobs.
5. Preserve your lien and bond-claim rights. Calendar notice and filing deadlines and manage lien waivers carefully — with counsel — so your collateral position stays intact.
6. Show clean dilution and aging history. Bring 12–24 months of AR aging, credit-memo detail, and a job-by-job WIP schedule; the cleaner the data, the better the advance rate.

Construction subcontractors sit at the intersection of long cash cycles, conditional payment, and complex lien and bonding law — which is exactly why a borrowing base built on the right eligibility, concentration, and dilution treatment can unlock working capital that a cash-flow lender won't touch. The key is preparing your billing, reporting, and contract discipline so the strongest possible portion of your receivables qualifies.

For additional industry background on asset-based lending structures and terminology, the Asset Based Lending Consultants (ABLC) resources are a useful reference. As always, the lien, bond, trust-fund, and contract-clause issues raised here are legal matters — review them with qualified construction counsel before acting.