Working as an electrician in the UK often means moving between jobs, contractors, agencies, and sites. Whether you’re installing wiring in new builds, fixing lighting in commercial units, or working on shop-fit projects, most electrical work is treated as self-employed for tax purposes.
And that means one thing:
You need a Unique Taxpayer Reference (UTR) before you can work correctly, get verified by contractors, or claim back expenses.
A UTR is the number HMRC uses to identify you for tax and without it:
- contractors may deduct 30% tax,
- you won’t be properly registered under CIS,
- and you won’t be able to submit your Self Assessment or claim refunds.
This guide explains exactly how UTRs work for electricians, why CIS matters, and how to avoid being overtaxed, a problem we see every week with new and experienced electricians at Tax2u.
How Electricians Are Treated for Tax Purposes
Unlike PAYE employees, electricians typically work:
- short-term contracts
- site-based jobs
- agency placements
- through multiple contractors
- with uneven weekly earnings
This pattern fits HMRC’s definition of self-employment, which is why most electricians must register as self-employed and receive a UTR before starting. Registering formally through the Self-Employed Registration ensures HMRC receives accurate details and issues your UTR without delays. Once you’re registered, your UTR becomes your identity for all future electrical jobs and tax returns.
Why most Electricians fall under CIS (even domestic ones sometimes do)
Many electricians assume that CIS only applies to “construction workers,” but HMRC uses a much broader definition.
Electricians fall under CIS when they work on:
- rewires and refurb projects
- new build installations
- commercial lighting and testing
- industrial maintenance
- shopfits and office refits
- fire alarm and CCTV installations
- landlord certification and EICRs on behalf of contractors
If the work is connected to construction, renovation, repair, or installation, CIS often applies. Once your UTR is active, your next step is usually to join the Construction Industry Scheme, which ensures contractors deduct 20% tax, not 30%. You can complete CIS registration with us.
Getting paid as an Electrician: CIS Deductions & how they affect you
When working under CIS, your contractor deducts tax before paying you. This deduction is meant to cover your annual tax but for electricians, the system rarely matches real-world costs.
Electricians typically have high expenses such as:
- tools and equipment (often replaced regularly)
- testers, meters, drills, ladders
- materials like cable, fixings, and accessories
- van costs, fuel, and insurance
- PPE and workwear
- mileage for site visits
- software, trade memberships, public liability insurance
Because contractors deduct a flat 20%, the deduction rarely reflects your real profit. And that’s why electricians almost always get a tax refund at the end of the year, often between £2,000 and £3,500, depending on work patterns.
What your First Self-Employed Tax Return looks like
Once you have your UTR and begin working, HMRC expects you to file a CIS tax return every year.
Your return will include:
- all CIS income
- all CIS deductions
- tool and equipment costs
- material costs
- travel and mileage
- van insurance and running costs
- training, safety courses, and certification costs
- any PAYE income (if you worked both ways)
Electricians often miss significant deductions because they:
- don’t track mileage accurately
- don’t claim for small tools
- forget to claim home-office or admin work
- don’t keep all CIS statements
- underestimate how much materials cost across the year
Tax2u handles these details for you and ensures your claim includes everything you’re entitled to.
Common mistakes Electricians make with their UTR, CIS & Tax Return
Through years of working with electricians, we see the same problems repeatedly:
- Registering too late, causing HMRC penalties
- Getting taxed 30% because CIS wasn’t set up with the contractor
- Entering the wrong start date when registering
- Not claiming tool costs because receipts were lost
- Forgetting van/mileage claims
- Not realising EICR work can be claimed as self-employed income
- Mixing PAYE and CIS income incorrectly
- Missing the Self Assessment deadline
- Assuming contractors handle everything
These mistakes cost electricians thousands every year but all are avoidable with the right setup.
Why Electricians Choose Tax2u
Electricians trust Tax2u because we understand the trade. Your work is hands-on, unpredictable, and often involves moving from job to job. Our role is to take the stress out of HMRC rules so you can focus on earning, not paperwork.
Electricians use Tax2u because:
- We handle UTR, self-employment, CIS and tax returns all in one place
- We know which electrical expenses can be claimed and which can’t
- We maximise your refund by checking every tool, material, and mileage claim
- We manage all the HMRC registration steps for you
- We help you avoid penalties and missed deadlines
- We support you year-round, not just at tax time
For many electricians, Tax2u becomes their long-term tax partner, filing returns, managing CIS, and keeping them compliant as they grow.
FAQs for Electricians
- Do electricians always need to join CIS?
If you work for contractors, agencies or on construction-related projects, yes. Domestic-only electricians may be exempt, depending on how they work.
- Can I start working before my UTR arrives?
Yes but contractors must deduct 30% tax until you have your UTR and are registered under CIS.
- Do electricians get larger refunds than most trades?
Often yes, because tools, mileage, and materials costs are higher.
- Can I be both PAYE and CIS at the same time?
Yes. Many electricians work both ways, the tax return combines both income types.
Ready to start working as a Self-Employed Electrician?
Tax2u can help you get your UTR, register under CIS, and file your Self Assessment tax return making sure you keep more of what you earn.