Invoice finance for construction and CIS subcontractors

Construction is widely regarded as the hardest sector in the country to fund on invoice finance. Cash flow in the trade is brutal. You buy materials and pay labour long before you get paid, retentions sit uncollected for a year or more, and payment down the chain depends on someone above you being paid first. Invoice finance should be the obvious fix, yet many mainstream lenders will decline a construction application before they have finished reading it.

This guide explains why that happens, and what a specialist construction invoice finance lender does differently. If you run a groundworks, civils, mechanical, electrical or fit-out firm, this is the difference between a facility that works and a year of frustration.

Why mainstream lenders avoid construction

A generalist invoice finance lender is built around a simple model. You raise an invoice, the customer owes a fixed sum by a fixed date, and very little can reduce that debt between invoice and payment. Construction breaks almost every part of that model.

• You rarely raise a clean invoice. You submit an application for payment, an estimate of work done that the customer can revise or reject.
• Payment comes in stages through interim valuations, so a single job produces a long series of part payments rather than one settled invoice.
• Retentions of typically 3% to 5% are held back on every valuation, then released in two halves, often 12 months or more after practical completion.
• Pay-when-paid and pay-when-certified clauses mean your money depends on a party further up the chain that you have no contract with.
• Contra charges and set-off let the main contractor deduct for delays, defects, plant hire or attendance, shrinking the sum owed after you have submitted it.
• If a main contractor goes insolvent, the whole chain below is exposed at once, and the lender with it.
• Construction Industry Scheme deductions of 20% or 30% are taken from the labour element before you are paid, so the cash received never matches the certified figure.

Any one of these is enough to make a generalist underwriter nervous. Together they explain why so many panels carve construction out entirely.

In most sectors the invoice is the debt. In construction the invoice is only an opening offer, and the lender that does not understand that difference will always price it wrong or decline it.

Applications for payment versus invoices

The single biggest technical hurdle is the application for payment. Under a JCT or NEC contract you apply for the value of work completed in a period. The contractor then issues a payment notice or certificate confirming what they will actually pay, often less than you applied for. Only certified sums are genuinely reliable.

A specialist construction lender funds against applications and certified valuations rather than refusing them. Some advance against the application itself at a lower rate, then top up once the valuation is certified. Others fund only the certified figure, but quickly and without the friction a generalist would create. Either way, the lender is comfortable with a debt that moves.

Handling retentions

Retention is money you have earned but cannot touch, sometimes for well over a year. Most facilities will not fund retentions at all, because the release date is uncertain and the sum can be reduced by defects. A construction specialist treats retentions as a separate, known part of the ledger, and some offer a dedicated retention funding line that advances a portion of retained sums ahead of release. That frees up cash that would otherwise be dead for 12 months or more.

Getting CIS deductions right

The Construction Industry Scheme trips up lenders who do not know the trade. When a contractor pays a subcontractor, they deduct 20% (or 30% if unverified) from the labour element and pay it to HMRC. So the cash that lands is lower than the certified value, purely because tax has been taken at source.

A lender who does not understand CIS sees the shortfall and treats it as a dispute or a bad debt. A specialist reconciles the deduction correctly and does not penalise you for tax that was always going to be withheld.

Subcontractors versus main contractors

The two sit very differently with a lender. As a subcontractor you fund applications you submit up the chain, so the lender is underwriting the main contractors above you and the risk they fail or apply heavy contra charges. As a main contractor you fund what your clients owe you, but the lender now weighs your own subcontractor liabilities and whether a collapse below you could drag you down. Neither is impossible to fund. Both simply need a lender who reads the contract structure correctly and prices for the real position.

What a lender needs to see

For the best chance of a strong facility, come to the table with your paperwork in order.

1. Your standard contract terms, whether JCT, NEC or bespoke, so the lender can see payment mechanisms, notice periods and any pay-when-paid wording.
2. A clear schedule of applications, certificates and payments for recent jobs, showing how closely certified sums track applications.
3. Your retention position, listing what is held, against which contracts, and expected release dates.
4. CIS status and verification for your subcontractors and your own gross or net payment status.
5. A view of your main-contractor mix, so concentration and counterparty risk can be assessed honestly.

A worked example: a groundworks subcontractor

Take a groundworks firm with £400,000 outstanding in applications for payment across four active sites. A generalist lender that will not fund applications offers nothing until each valuation is certified, leaving the cash stranded for weeks.

A specialist construction lender advances 70% against the applications, releasing roughly £280,000 straight away. As each valuation is certified, the advance moves up to 85% on the certified figure. On a typical £100,000 application certified at £92,000, that lifts funding on that line from £70,000 to about £78,200. CIS deductions on the labour element are reconciled correctly, so the modest gap between the certified value and the cash received is expected rather than flagged as a dispute. Retentions of around £16,000 held across the four sites sit in a separate line, with a portion fundable ahead of release. The result is working capital that tracks the real progress of the jobs.

Why the right lender matters more here

In most sectors the choice of invoice finance lender affects price at the margin. In construction it decides whether you get funded at all. The panel that will genuinely fund applications, handle retentions and reconcile CIS correctly is a specialist minority, and they are not always the names you would recognise. Going to the wrong lender wastes weeks and often ends in a decline that need never have happened.

As a commercial finance broker we are not regulated by the FCA, which is correct for business-to-business commercial finance, and it lets us work across the specialist construction lenders rather than a single provider's book. If your cash flow is being held hostage by valuations, retentions and slow certification, speak to our invoice finance team. We will tell you honestly which lenders fit your contract structure and put your position in front of the ones built for the trade.