Invoicing for Tradespeople: Materials, Labour and VAT

Tradespeople — electricians, plumbers, builders — invoice for both labour and materials, which brings its own invoicing considerations.

Labour and materials

Itemise labour (hours or a lump sum) separately from materials. Clear separation helps the client understand the bill and makes disputes easier to resolve.

Show labour and materials as distinct sections on the invoice. A client who sees exactly what they are paying for is far less likely to challenge the total.

Itemise labour with the hours and rate, or as an agreed lump sum, so the basis of the charge is transparent.

List materials with quantities and unit prices, and note any markup if you apply one. Hidden or lumped material costs are the most common source of trades disputes.

• Itemise labour separately.
• Itemise materials separately.
• Show quantities and rates.

VAT considerations

If you are VAT-registered, the correct rate applies to the supply as a whole. Some construction-related services also have specific reverse-charge rules between registered businesses.

When you are VAT-registered, the applicable rate applies to the whole supply, including both labour and materials, unless specific rules say otherwise.

Certain construction services between registered businesses can be subject to a reverse-charge or reporting mechanism rather than the ordinary rate. Confirm which applies to your trade.

If you are not VAT-registered, you do not charge VAT at all, but you must also not show VAT on the invoice. Getting the registration threshold and treatment right matters.

• Apply the correct rate to the whole supply.
• Check reverse-charge rules for construction.
• Do not show VAT if not registered.

Document the work

Reference the work order or quotation number on the invoice, so the bill maps back to what was agreed. A bill with no anchor is easy to dispute.

Record any change requests and their agreed cost, and reflect them on the invoice. Changes made on site are the most frequent dispute trigger.

Keep photos or notes of the work where useful. In a trades dispute, visual evidence of what was done settles arguments faster than words.

• Reference the work order.
• Record and bill change requests.
• Keep evidence of the work done.

Handle deposits and payment

Trades work often involves buying materials up front, which justifies a deposit. Structure payment to protect your cash flow and the materials you have already bought.

Take a deposit that at least covers the materials you must purchase. A client who has paid for materials is committed to the job.

Agree staged payments for larger projects, tied to completed phases rather than a single sum at the end. This keeps cash flowing and reduces your exposure.

State the payment terms clearly on the invoice, including the due date and any late-payment consequences. Trades invoices are often paid late without a clear deadline.