Invoice Finance for Construction Companies: Stage Payments, Retention and Cash Flow
Construction firms face a double cash-flow squeeze: stage payments tied to certified valuations and retention sums withheld for months or years after practical completion. Invoice finance can bridge both gaps, but the structure of a facility matters. This guide explains how construction invoice finance works, what lenders will and will not fund, and what to check before signing.
Why construction cash flow is different from other sectors
Construction companies routinely wait 30 to 90 days for certified payment on interim applications, while paying subcontractors, plant hire firms and material suppliers on much shorter terms. That gap is structural, not a sign of poor management.
Retention compounds the problem. Clients typically withhold 3 to 5 per cent of each certified sum until the defects liability period ends, which can be 12 months or more after practical completion. A firm turning over £4 million a year could have £80,000 to £200,000 locked in retention at any one time, none of which appears as usable cash.
How invoice finance works for construction firms
Invoice finance releases a percentage of the value of an approved invoice or certified payment application before the client pays. The two main structures are factoring, where the provider manages your sales ledger and collects payment directly, and invoice discounting, where you retain control of collections and the facility sits confidentially in the background.
Most construction firms prefer confidential invoice discounting because relationships with main contractors and clients are long-term and sensitive. The lender advances typically 70 to 85 per cent of the certified sum, with the balance released minus fees once the client pays.
The advance rate is lower than in other sectors because construction invoices carry more credit risk: disputes, set-offs and contra charges are common, and lenders price for that uncertainty.
What lenders will and will not fund in construction
Lenders are cautious about construction receivables. Most will fund interim payment applications that have been certified by a contract administrator or quantity surveyor, because certification reduces the risk of a dispute reducing the payable amount.
Retention balances are harder to fund. Some specialist lenders will advance against retention, but typically at a lower rate of 50 to 60 per cent, and only once practical completion has been certified. Uncertified applications, anticipated valuations or disputed sums are almost never fundable.
Most standard invoice finance providers exclude construction outright because of the Payment Act mechanisms, set-off rights and the risk of employer insolvency. If a provider says yes immediately without asking about contract type, that is worth probing carefully.
Construction-specific invoice finance providers in the UK
A small number of lenders have built products specifically for the construction sector. Bibby Financial Services, Ultimate Finance and Close Brothers Invoice Finance all have specialist construction desks with underwriters who understand JCT, NEC and bespoke contracts.
Some regional and challenger lenders also offer tailored facilities, particularly for London and South East subcontractors where deal sizes justify the complexity. High street banks, including HSBC and Lloyds, have largely withdrawn from construction invoice finance for smaller firms, directing clients toward asset-based lending or term loans instead.
When comparing providers, ask specifically whether they fund applications before payment notice is issued, how they treat pay-less notices, and whether their legal charge interferes with any project bond or retention bond already in place.
The impact of the 3.75% base rate on construction finance costs
Most invoice finance facilities price on a margin above the Bank of England base rate, currently 4.50 per cent as of March 2026. The discount charge, which is the interest element applied to drawn funds, typically runs at base rate plus 2.5 to 4.5 per cent for construction, reflecting the higher risk profile of the sector.
At current rates, a construction firm drawing £500,000 continuously for 60 days would pay approximately £7,500 to £12,500 in discount charges for that period, depending on the margin agreed. That compares with roughly £5,000 to £7,500 at the 2020 base rate of 0.10 per cent. Higher base rates make the facility materially more expensive, so it is worth modelling the all-in cost against the value of releasing tied-up cash.
Retention release finance: a separate product worth knowing
Some lenders offer a distinct retention finance product, separate from a revolving invoice finance facility. This is essentially a term loan or structured advance secured against the certified retention balance owed by a named employer.
The lender takes an assignment of the retention debt and advances a lump sum, typically 50 to 70 per cent of the gross retention, to be repaid when the employer releases the funds. Fees are higher than standard invoice finance, but for firms with significant retention tied up across multiple contracts, the liquidity benefit can outweigh the cost.
Before using retention finance, check your subcontract terms. Some JCT and NEC subcontracts restrict assignment of receivables without employer consent. Breaching that clause can create a contractual dispute on top of a finance arrangement.
Practical steps before applying for construction invoice finance
Preparation significantly improves approval speed and the terms offered. Lenders will want to see a debtor schedule broken down by contract, with certified amounts, expected payment dates and any known disputes or set-offs noted against each line.
You will also need to provide your main contracts or subcontracts so the lender can assess the payment mechanism, retention terms and any pay-less notice provisions. Companies House filings, management accounts for the last six months and HMRC payment records are standard requirements.
If you use specialist construction accounting software such as Causeway or Coins, most lenders can integrate directly, which speeds up the ongoing administration of the facility considerably.
Key questions to ask a construction invoice finance provider
Before committing to a facility, ask the provider how they handle a pay-less notice issued after you have drawn against an application. Understand whether the advance becomes immediately repayable or whether they allow a short cure period while the dispute is resolved.
Ask about concentration limits. If 60 per cent of your turnover comes from one main contractor, some lenders will cap the advance against that debtor, reducing the facility's usefulness. Also clarify the minimum service period, the exit fee structure and whether the debenture they take will conflict with any plant finance or property charge already registered at Companies House.
Getting clear written answers to these questions before signing saves significant difficulty later in the contract term.
| Facility type | Typical advance rate | Typical discount charge (above base) | Best suited to | Notes |
|---|---|---|---|---|
| Confidential invoice discounting | 75 to 85% | +2.5 to +3.5% | Established firms, £1m+ turnover, long-term client relationships | Client unaware of facility; firm manages own collections |
| Disclosed factoring | 70 to 80% | +3.0 to +3.75% | Smaller firms or those with weaker credit control | Provider collects payment; clients notified |
| Selective or spot finance | 70 to 80% | +4.0 to +6.0% (flat fee common) | Firms needing occasional funding on specific contracts | No long-term commitment; higher cost per invoice |
| Retention finance | 50 to 70% of retention balance | +4.5 to +7.0% | Firms with significant retention locked across multiple contracts | Check contract assignment clauses before applying |
| Asset-based lending with invoice element | Up to 85% invoices, plus plant and property | +2.0 to +3.5% | Capital-intensive firms with owned plant or property | Higher availability but more complex security package |
Step by step
- Prepare a full debtor schedule listing each certified application, the contract it relates to, the amount, the expected payment date and any known disputes or set-offs.
- Gather your main contracts or subcontracts so the lender can review payment mechanism clauses, retention terms, set-off rights and any restrictions on assignment of receivables.
- Obtain management accounts for the last six months, your latest Companies House filing, and evidence that HMRC payments are up to date, as lenders will request all three early in the process.
- Request written terms from at least two specialist construction invoice finance providers, comparing advance rates, discount charge margins, service fees, concentration limits and minimum contract periods side by side.
- Before signing, ask each provider specifically how they handle a pay-less notice issued after an advance has been drawn, and confirm that their debenture will not conflict with existing charges registered at Companies House.
Example
A Birmingham groundworks subcontractor with £3.2 million annual turnover had £140,000 in certified retention across four commercial contracts and a 60-day gap between submitting applications and receiving payment from its main contractor. It arranged a confidential invoice discounting facility with a specialist construction lender, advancing 80 per cent against certified sums. Cash flow stabilised within the first month, allowing the firm to pay its own subcontractors promptly and avoid late payment charges under the Late Payment of Commercial Debts Act.
FAQs
Can a construction company use standard invoice finance rather than a specialist construction product?
Most standard invoice finance providers exclude construction because of the complexity of payment mechanisms, set-off rights and retention. A few generalist lenders will consider simple subcontract arrangements where applications are certified promptly and disputes are rare, but they tend to apply lower advance rates and tighter concentration limits. For most construction firms, a specialist lender with underwriters who understand JCT and NEC contracts will offer better terms and fewer unexpected restrictions.
Do invoice finance providers fund applications before they have been certified?
Almost all lenders require certification by a contract administrator or quantity surveyor before they will advance against an application. Uncertified applications carry too much dispute risk for most lenders to accept as eligible receivables. Some providers will fund on submission of an application if there is a strong track record and no history of significant pay-less notices on the contract, but this is the exception rather than the rule and usually comes with a lower advance rate.
How does retention finance differ from including retention in a standard invoice discounting facility?
Standard invoice discounting facilities typically exclude retention entirely, or include it only after practical completion is certified. Retention finance is a separate structured product where the lender takes a specific assignment of the retention debt owed by a named employer and advances a lump sum against it. The cost is higher than standard discounting, but it unlocks cash that a revolving facility would not reach. The two products can run alongside each other if the firm has both current certified applications and significant retention to release.
What happens if a main contractor issues a pay-less notice after we have drawn funds against an application?
This is the key risk question to ask any lender before signing. The pay-less notice reduces the amount legally payable on that application, which means the certified sum you drew against is no longer fully supported. Some lenders treat this as an immediate clawback, requiring repayment of the advance above the revised payable amount within a short period. Others allow a brief dispute resolution window. Understanding the lender's contractual position on pay-less notices before you sign is essential, not optional.
Is the interest cost of construction invoice finance tax deductible?
The discount charge and service fees paid on an invoice finance facility are generally treated as a finance cost and are deductible against trading profits for corporation tax purposes, subject to the usual HMRC rules on business expenses. The specific treatment can depend on the structure of the facility and how it is reflected in your accounts. You should confirm the tax position with your accountant before entering into any significant finance arrangement, particularly where retention finance or a structured asset-based product is involved.
Director, Market Invoice
Oliver leads Market Invoice's editorial and comparison research. With a background in UK commercial finance, he oversees provider analysis, rate verification, and industry reporting across all verticals.
Last reviewed: 1 May 2026