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Invoice finance for contractors: funding applications for payment and retentions

Invoice finance for contractors can fund some construction payments, but not all. Here is what lenders fund, what they leave out and what they check.

Reading time 5 min read
Category Business guides
Written by The bizbritain team
Invoice finance for contractors can work, but construction payments are harder to fund than most invoices. You are often paid against an application for payment, not a simple invoice. Part of the money is held back as a retention, and tax may be deducted under the Construction Industry Scheme. Some lenders will fund that. Some will not touch it.
That matters more this winter. According to S&P Global, UK construction activity fell again in October. Housebuilding was the weakest part of the industry, and input costs rose at the fastest rate since June.
43.6UK construction PMI in October, below 50 for the 22nd month running
35.1housebuilding, its lowest reading since December 2025
34%of firms expect output to grow in the next year, against 27% expecting a fall
4%Bank Rate after the Bank of England's rise on 5 November
The PMI figures are from S&P Global's October survey. A reading below 50 means activity is shrinking.

Section 01

Why are construction payments harder to fund?

Most invoice finance is built for simple invoices. You deliver the goods, send the invoice and the customer pays a fixed amount on a known date. The lender advances part of that amount and is repaid when the customer pays.
Construction rarely works like that. Four things make it different.
  • Applications for payment. You claim for work done so far, and the main contractor values it. The amount you are paid can be lower than the amount you claimed.
  • Deductions and set-off. The main contractor may hold back money for delays, defects or charges they say you owe. A lender cannot be sure what will actually be paid.
  • Retentions. A share of each payment is often held back until the job is finished, and sometimes until a defects period ends. According to the Department for Business and Trade, retained money can be paid late, paid in part or lost if a firm higher up the chain fails.
  • CIS deductions. If you are registered for the Construction Industry Scheme, the contractor must deduct 20% from your payments and pass it to HMRC. If you are not registered, the deduction is 30%. Subcontractors with gross payment status have no deduction taken.
Each of these makes the amount, or the date, less certain. That is the risk a lender is pricing.

Section 02

Can invoice finance for contractors fund an application for payment?

Often, yes, but rarely all of it. A lender that funds construction usually works from the amount agreed or certified, not the amount you applied for.
Retentions are usually left out of the amount a lender will advance against. So are disputed sums. CIS deductions come off too, because that money goes to HMRC rather than to you.
Some invoice finance providers will not fund construction work at all. Others specialise in it and understand how applications, valuations and retentions work. If one provider says no, that is not the answer from the whole market.
Ask any provider three questions before you sign. Do you fund applications for payment, or only invoices? How do you treat retentions? What happens if the main contractor deducts part of a payment?

Section 03

What does a lender look at?

A lender is judging how likely it is that the money arrives in full and on time. These are the usual checks.

  1. The contract

    The lender will want to read the payment terms, the retention terms and any rules on deductions. Clear terms are easier to fund.

  2. The firm that pays you

    The main contractor's own finances matter as much as yours. A lender is more comfortable when the payer is well established.

  3. Your payment history

    Records of past applications and what was actually paid help. They show how often valuations are cut and how late payments arrive.

  4. Disputes and claims

    Open disputes with the main contractor make funding harder. Settle or document them before you apply if you can.

  5. Your tax status

    Lenders will ask about your CIS registration. It tells them how much of each payment will reach you.

Section 04

Invoice finance or a short-term loan?

Invoice finance grows with your work. As you claim for more, you can draw more. That suits a business with steady contracts and payers who pay, if slowly.
A short-term loan gives you a fixed sum for a set period. It can suit a business with one gap to bridge, such as wages and materials before a large payment lands. It is also simpler when your payments are hard for an invoice finance provider to fund.
For the general comparison, see our guide to invoice finance or a business loan when customers pay slowly.
If you are not sure which fits, a broker can look at your contracts across a wider range of lenders. We help trades and contractors find business growth finance that matches how they are paid.

This guide is general information, not financial advice. Applications are subject to status, affordability and lender criteria.

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