A construction invoice has to do three jobs at once: split labour from materials, show any CIS deduction and retention clearly, and state the right VAT treatment. This guide gives you the trade-specific lines, a worked example that combines all three, and a ready structure you can copy today.
What should a construction invoice include?
A construction invoice should include your business name, address and contact details, a unique invoice number, the client name and site address, the project or job reference, invoice and work dates, separate labour and materials lines, any CIS deduction, retention and VAT treatment, the amount payable now, payment terms and your bank details.
You want a template you can send today, with CIS lines that are correct. Build the same layout in LancerBill’s invoice generator and send it in minutes.
Trade-specific line items builders should list
Generic lines like “building work” invite queries and slow payment. Lines that mirror the job do not. Use this set as your default:
| Line item | What to show | Example wording |
|---|---|---|
| Labour | Days or hours and the rate, split by stage or trade where rates differ | Labour, groundworks stage: 10 days at 280 pounds per day |
| Materials | Each main material at cost, with quantity, kept separate from labour | Bricks, blocks and cement at cost: 1,800 pounds |
| Plant and scaffolding | Hire period and supplier cost, as its own line | Mini digger hire, 2 weeks |
| Preliminaries | Site setup, welfare, skips and waste removal where charged | Skip hire and waste disposal |
| Variations | Agreed extras, with the agreement date and who approved them | Variation 2, extra stud wall, agreed 28 September |
| Retention | Percentage held and the condition for release, as a deduction line | Less retention held under the contract |
| CIS deduction | Rate applied and the labour amount it was applied to, as a deduction line | Less CIS deduction at 20 percent on labour only |
Tip: keep supplier receipts for materials with the invoice number written on them. If a contractor questions the materials figure, one receipt ends the argument and protects the split.
How does CIS change a construction invoice?
Under the Construction Industry Scheme, a contractor deducts tax from a subcontractor’s labour payment and pays it to HMRC as an advance towards that subcontractor’s tax bill. The deduction is 20 percent for a CIS-registered subcontractor, 30 percent if the subcontractor is not registered or cannot be verified, and zero if the subcontractor holds gross payment status.
HMRC sets the rates through verification, not either party. Our explainer, CIS explained for UK construction subcontractors, covers registration and gross payment status.
Three rules matter on the invoice itself. First, the deduction applies to labour only. You exclude VAT and the direct cost of materials the subcontractor paid for, as HMRC sets out in its guidance on the VAT domestic reverse charge for building and construction services and its CIS guidance. Second, show the deduction as a separate negative line, stating the rate and the labour figure it came from. Third, remember it is not your final tax bill. It is a payment on account, reconciled later through Self Assessment or, for a limited company, against its tax liabilities.
Watch out: never let a contractor deduct CIS from the materials portion. On a materials-heavy job that single error can take hundreds of pounds out of a payment that was never taxable at source. Check every payment and deduction statement against your own invoice split.
Worked example: a subcontractor invoice with CIS, retention and reverse charge VAT
Assume you are a CIS-registered subcontractor in the UK for the 2026/27 tax year, VAT-registered, billing a VAT-registered main contractor for a groundworks stage. The work is reported under CIS, your client is not the end user, so the VAT domestic reverse charge applies. Your contract holds retention until practical completion. Rates last reviewed: October 2026.
| Description | Calculation | Amount |
|---|---|---|
| Labour, groundworks stage | 10 days at 280 pounds, plus 8 days at 300 pounds | 5,200 pounds |
| Materials at cost (bricks, blocks, cement, drainage) | Supplier invoices, at cost | 1,800 pounds |
| Net subtotal | 5,200 + 1,800 | 7,000 pounds |
| Less CIS deduction | 20 percent of labour only: 5,200 x 0.20 | -1,040 pounds |
| Less retention held | 5 percent of net subtotal: 7,000 x 0.05 | -350 pounds |
| VAT | Reverse charge, customer accounts for VAT | 0 pounds added |
| Amount payable now | 7,000 – 1,040 – 350 | 5,610 pounds |
Check the arithmetic step by step. Labour: 10 x 280 = 2,800 pounds, plus 8 x 300 = 2,400 pounds, giving 5,200 pounds. Add materials: 5,200 + 1,800 = 7,000 pounds net. CIS: only the 5,200 pounds labour figure is deducted on, so 5,200 x 0.20 = 1,040 pounds. Retention: 7,000 x 0.05 = 350 pounds. Payable now: 7,000 – 1,040 – 350 = 5,610 pounds.
For VAT, add this wording to the invoice: “Domestic reverse charge applies. Customer to account for VAT to HMRC.” State the VAT that the customer must account for: 7,000 x 20 percent = 1,400 pounds. That 1,400 pounds is information for the customer’s VAT return. It is not added to what they pay you.
A lump sum would break this: 20 percent of the full 7,000 pounds is 1,400 pounds, a 360 pound over-deduction caused only by a missing materials split. Rebuild this layout in LancerBill’s construction invoice generator and check the VAT side with LancerBill’s VAT calculator.
Which VAT and CIS treatment fits your job? A decision framework
Most template sites give you one blank layout and leave the tax treatment to guesswork. In practice the right treatment depends on who your customer is. Use this framework first, then pick the invoice wording.
| Your customer | CIS deduction | VAT treatment | Invoice must state |
|---|---|---|---|
| VAT-registered main contractor, not the end user, work reported under CIS | Contractor deducts at your verified rate, on labour only | Domestic reverse charge, no VAT added by you | Reverse charge wording and the VAT the customer must account for |
| Homeowner using the property themselves | No CIS deduction, a householder is not a CIS contractor | Normal VAT if you are registered | Your VAT number, rate and VAT amount in the usual way |
| Business end user who confirms end user status in writing | CIS can still apply if they are a contractor | Normal VAT, reverse charge does not apply | Keep their written end user confirmation with the invoice |
| Client for zero-rated work, such as most new-build homes | CIS applies in the usual way if they are a contractor | Zero rate, reverse charge does not apply to zero-rated supplies | Zero rate shown, with the reason recorded |
The domestic reverse charge has applied to most standard and reduced rate construction services between VAT-registered businesses in the CIS chain since 1 March 2021, according to HMRC guidance on the VAT domestic reverse charge. It does not apply where the customer is an end user, where the supply is zero-rated, or where either party is not VAT-registered. If you are unsure which row fits, ask the customer to confirm their end user status in writing before you invoice, not after a dispute starts.
Rule of thumb: CIS decides how much tax is held back from your labour. The reverse charge decides who accounts for the VAT. They are separate tests, and a construction invoice often has to show both.
How do you fill in a construction invoice, step by step?
Start with a sequential invoice number and project reference, add your details, the client’s details and the site address, then list labour, materials, plant and variations as separate lines. Show the net subtotal, deduct CIS on labour only and any retention as separate lines, state the VAT treatment, and finish with the amount payable now and an exact due date.
1. Reference the project and stage. Use one job reference on every application, invoice and statement for that project. On a long job, the stage label, such as “Stage 3, first fix complete”, is what lets the client certify the right amount.
2. Price variations separately. Never bury an extra in a revised labour line. A separate variation line with an agreement date protects you if the client later says the extra was never approved. Send the price first with a quote generator so the approval is written, not verbal.
3. Invoice the certified amount. On larger contracts you apply for payment and the client certifies a possibly lower amount. Invoice that certified figure, not your application figure.
4. Track retention as money owed. Record each amount, the project and the release condition, and diary the release date the day you send the invoice.
5. State an exact due date. Write “Payment due by 10 November 2026” rather than only a term. Our invoice payment terms guide explains how terms differ between domestic and commercial work, and our general guide on how to write an invoice covers the fields every trade needs.
Should builders and subcontractors charge VAT on invoices?
You charge VAT only if you are VAT-registered and the reverse charge does not apply. In the UK you must register when your taxable turnover passes 90,000 pounds in any rolling 12-month period, according to GOV.UK guidance on registering for VAT. If you are not registered, you add no VAT line, reverse charge or not.
Do not mix the two systems. If the reverse charge applies, do not also add VAT to the amount payable. If it does not apply, for example for a homeowner end user, a registered builder charges VAT normally. Getting this backwards creates a VAT return error and a payment delay.
Our plumber invoice template guide and electrician invoice template guide show the same labour and materials discipline for neighbouring trades.
For timber and joinery work, our carpenter invoice template guide covers staged billing on custom builds, and the painter and decorator invoice template guide covers per-room pricing and prep work.
Payment terms and late payment on construction jobs
Construction payment runs in stages, so timing matters as much as the rate you charge.
Invoice on the day the stage completes. A stage certified a week late is often paid a month late, because it misses the client’s payment run.
Reconcile every deduction statement. Match each contractor statement to your invoice split. Challenge a deduction taken on materials, or at 30 percent when you are registered, straight away.
Know the late payment route for business clients. For business customers, UK rules can allow statutory interest and fixed compensation on overdue amounts. Our guide to late payment fees on UK invoices explains the position, and the late payment fee calculator works out the figures. For a homeowner, start with a clear reminder that restates the stage, the amount and the exact due date.
Tip: keep a simple retention ledger per project: amount held, stage, release condition and release date. Retention is easy to forget on a job that finished a year ago, and unclaimed retention is pure margin handed back.
Common mistakes on construction invoices
Merging labour and materials. This is the costliest mistake on this page. It exposes materials to a CIS deduction they should never carry and makes the reverse charge figure harder to check.
Adding VAT on a reverse charge invoice. If the customer must account for the VAT, your invoice shows the net amount, the rate and the reverse charge wording, not a VAT amount in the payable total.
Forgetting the site address and stage. A main contractor running several sites cannot certify an invoice they cannot place. Site, stage and job reference belong on every document.
Hiding retention in the total. Show the gross stage value, then retention as its own deduction line, so both sides agree what is held and what will be released later.
No record of agreed variations. An extra agreed on site and invoiced from memory is the variation most likely to be refused. A short written quote or message approval, referenced on the invoice line, fixes it.
Sending a receipt instead of an invoice. An invoice or application asks for payment. A receipt confirms payment arrived. If a client needs proof after paying, issue one with LancerBill’s receipt generator rather than re-sending the invoice.
Key takeaways
- Every construction invoice needs a unique number, project and site references, the stage billed, separate labour and materials lines, and the amount payable now.
- CIS is deducted on labour only, at 20 percent if you are registered, 30 percent if you are not registered or verified, and zero with gross payment status.
- Show CIS and retention as separate deduction lines with the rate, the base figure and the release condition stated.
- Where the VAT domestic reverse charge applies, add no VAT to the payable total, state the reverse charge wording, and show the VAT the customer must account for.
- Pick the treatment by customer type first: main contractor, homeowner, written end user, or zero-rated work each need a different invoice.
Plumbing subcontractors can use the matching plumber invoice template with the same trade-specific line items.
Frequently asked questions
What should a construction invoice include?
Include your business details, a unique invoice number, the client name, the site address and project reference, the stage billed, separate labour, materials, plant and variation lines, the net subtotal, any CIS deduction and retention as separate lines, the VAT treatment, the amount payable now, an exact due date and your bank details.
How is a CIS deduction calculated on an invoice?
Take the labour amount only, excluding VAT and materials the subcontractor paid for, and apply the verified rate: 20 percent if CIS-registered, 30 percent if not registered or unverified, zero with gross payment status. On 5,200 pounds of labour at 20 percent, the deduction is 1,040 pounds.
Do I charge VAT on a construction invoice under the reverse charge?
No. Where the domestic reverse charge applies, you add no VAT to the amount payable. You state that the reverse charge applies, show the VAT rate, and the customer accounts for the VAT on their own VAT return. Normal VAT applies instead if the customer is an end user or the work is outside the reverse charge rules.
What is retention on a construction invoice?
Retention is a percentage of the amount due that the client holds back under the contract, usually released after practical completion and the defects period. Show it as a separate deduction line with the percentage and release condition, and keep a ledger so you claim it when it falls due.
Can I use this template as a sole trader builder?
Yes. Sole traders can invoice in their own name plus any trading name, with their business address and contact details. If you work as a subcontractor, your CIS status still applies, so keep the labour and materials split and check each payment and deduction statement you receive.
What is the difference between an application for payment and an invoice?
An application for payment is a request valuing work done on a larger contract, which the client then certifies, sometimes at a lower amount. The invoice follows for the certified amount. Invoice the certified figure, not the application figure, and reference the same project and stage on both.
This guide is for general information only and is not financial, tax or legal advice.