How to Invoice as a Self-Employed Electrician in the UK (2026 Guide)

1. What must an electrician's invoice include by law?

A legally compliant invoice for an electrician in the UK must include the following information:

• ·Your full name (or business name) and address
• ·Your customer's name and address
• ·A unique, sequential invoice number
• ·The invoice date and the date the work was carried out
• ·A clear description of the work — e.g. 'Consumer unit upgrade to 18th edition compliant dual-RCD board, 28 March 2026'
• ·Labour and materials broken out separately (essential for CIS work)
• ·The total amount charged
• ·Your payment terms and due date
• ·Bank details for payment
• ·If VAT registered: your VAT number, the rate applied, and the VAT amount

If you trade under a business name but operate as a sole trader, you must include your personal name too. For example: James Harris trading as Harris Electrical Services.

2. Part P compliance and registration numbers on invoices

Part P of the Building Regulations requires that certain domestic electrical work is carried out by a competent person or notified to the local authority. As an NICEIC, NAPIT, or ELECSA-registered electrician, you self-certify your work and issue an Electrical Installation Certificate (EIC) or Minor Works Certificate (MWC).

While including your scheme membership number on invoices is not a legal requirement, it is strongly recommended practice for several reasons:

• ·Customers may need your registration number to make insurance claims or when selling their property
• ·It signals professionalism and competence, reducing the likelihood of payment disputes
• ·Mortgage lenders sometimes require evidence of qualified installation for electrical work
• ·It links your invoice to the completion certificate, creating a clean audit trail

A good practice is to add a footer line to all domestic invoices: e.g. NICEIC Approved Contractor — Registration No. 12345678. EIC issued separately.

3. Invoicing for EV charger installation

EV charger installation has become one of the fastest-growing revenue streams for UK electricians. Invoicing for these jobs correctly matters both for your records and for customers who may be claiming grants.

What to itemise on an EV charger invoice

• ·Survey and design fee (if charged separately)
• ·EV charging unit — make, model, and rated output (e.g. Ohme Home Pro 7.4kW)
• ·Labour: first fix cabling and consumer unit work
• ·Labour: second fix and commissioning
• ·Any dedicated circuit or consumer unit upgrades required
• ·Cable containment (trunking, conduit, etc.)
• ·OZEV-compliant installation certificate (if applicable)

For domestic EV charger installations, VAT at the standard 20% rate typically applies to both the unit and installation labour. Some installations on new builds may qualify for zero-rating — check HMRC VAT Notice 708 if you are unsure.

For commercial premises (car parks, offices, fleet charging), invoices are more complex. You may need to include purchase order references, and CIS deductions can apply if you are working as a subcontractor for a developer or facilities management contractor.

4. Domestic vs commercial electrical invoices

The type of customer you invoice makes a significant difference to what your invoice needs to include and how you should approach payment terms.

Domestic customers

• ·Simpler invoices — work description, total, and payment details
• ·Payment typically expected on completion or within 7 days
• ·Include your competent person scheme registration number
• ·Reference any completion certificate or EICR issued
• ·Deposits of 25–50% are standard for larger rewires

Commercial customers

• ·Include their purchase order (PO) number — many commercial clients won't pay without it
• ·Payment terms of 30 or 60 days are common; negotiate 14 or 30 days where possible
• ·If operating as a limited company, include your company registration number
• ·Labour/materials split is essential for CIS compliance
• ·Progress invoicing on large contracts: agree milestone payments upfront

Using TraderInvoice for electricians lets you save customer profiles so commercial invoice details — including PO numbers and payment terms — are pre-filled on every job, saving you time and reducing errors.

5. VAT for electricians

VAT registration becomes mandatory once your taxable turnover exceeds £90,000 in any rolling 12-month period (the 2026 threshold). Below that, registration is optional — but there are good reasons to consider voluntary registration if you work mainly for VAT-registered businesses.

VAT rates for electrical work

• ·20% standard rate — applies to most domestic and commercial electrical work
• ·0% zero rate — new residential builds (labour and some materials)
• ·0% — certain energy-saving installations (including EV chargers on some new builds)
• ·5% reduced rate — converting non-residential buildings to dwellings
• ·5% — some work for disabled people (e.g. specialist wiring for mobility equipment)

Domestic reverse charge

If you supply electrical services to another VAT-registered business in the construction sector, you may be required to use the domestic reverse charge (DRC). Under DRC, you do not charge VAT on your invoice — instead, the customer accounts for VAT themselves. Your invoice must state: "Domestic Reverse Charge applies — customer to account for VAT to HMRC."

DRC applies to most construction services including electrical installation, but does not apply when supplying to end users (e.g., directly to a homeowner or a business that is the final occupier of the building).

6. CIS for electrical contractors

The Construction Industry Scheme applies to electricians who work as subcontractors on construction projects. If you are fitting out new builds, working on commercial developments, or providing electrical labour to a main contractor, you are likely within CIS.

Under CIS, the contractor deducts tax from the labour element of your invoice:

• ·20% if you are CIS registered with HMRC
• ·30% if you are not registered (a costly mistake to avoid)
• ·0% if you have gross payment status (requires clean tax history and minimum turnover)

Critically, CIS deductions apply only to labour — not to the cost of materials or equipment you supply. This makes it essential to clearly separate these on your invoice. Here is an example:

You reclaim the deducted tax through your Self Assessment tax return, offsetting it against your income tax liability.

7. Payment terms and getting paid faster

Late payment is a persistent problem for self-employed electricians, particularly on larger domestic rewires and commercial projects. Setting clear payment terms upfront — and including them on every invoice — dramatically reduces disputes.

• ·Small domestic jobs (fault finding, adding sockets): payment on completion
• ·Consumer unit upgrades and rewires: 25–50% deposit, balance on completion
• ·Commercial clients: 14 or 30 days net from invoice date
• ·Emergency call-outs: payment on the day by card or bank transfer
• ·New build contracts: stage payments tied to first fix, second fix, and commissioning sign-off

Always include your bank account details directly on the invoice. The fewer steps a customer has to take to pay you, the faster the money arrives. Sending invoices via TraderInvoice means you can send professional invoices from your phone the moment you finish a job — no waiting until you get home to the laptop.

For commercial debts, you are legally entitled to charge statutory interest at 8% above the Bank of England base rate and a fixed compensation fee (£40–£100 depending on debt size) under the Late Payment of Commercial Debts (Interest) Act 1998. Stating this on your invoices — even if you never enforce it — often encourages faster payment.

8. Frequently Asked Questions