CCTV Installer
Tax & MTD Guide

Fitting CCTV is a hands-on, kit-heavy trade, and the tax that goes with it looks nothing like a desk job's. You are up ladders running cable through soffits, drilling into brick, terminating connectors, configuring NVRs and apps, and driving a van full of tools and stock between jobs. Some weeks you invoice a security company as a subcontractor; other weeks you bill a homeowner directly for a four-camera install. That split, between contractor work that falls under the Construction Industry Scheme and direct retail work that does not, is the thing that shapes your whole tax position.

This guide is written for the self-employed CCTV, alarm and access-control installer. It covers how your profit is taxed, why CIS deductions almost always lead to a refund, the specific expenses a security installer can claim, and how VAT, National Insurance and Making Tax Digital land on this trade. Get your records straight as you go and the annual return stops being a scramble.

How Tax Works for a Self-Employed Installer

As a sole trader you pay Income Tax on your profit, which is everything you invoice (labour and any materials you supply) minus your allowable business expenses. For 2025/26 the personal allowance covers the first GBP 12,570, then you pay 20% up to GBP 50,270, 40% to GBP 125,140 and 45% above. The personal allowance tapers away between GBP 100,000 and GBP 125,140, creating an effective 60% band in that zone. Class 4 National Insurance is 6% on profit between GBP 12,570 and GBP 50,270 and 2% above, while Class 2 NIC is settled through Self Assessment.

Scottish installers pay Scottish Income Tax through six bands (19%, 20%, 21%, 42%, 45% and a 48% top rate) and carry an S-prefixed tax code; National Insurance stays UK-wide. Welsh installers have a C-coded tax code at rates currently matching the rest of the UK. If you also have a PAYE security job alongside your self-employment, or you have just come off the tools as an employee, your code can be wrong and you may be overpaying through the month. Run it through the tax code checker to be sure.

CIS: The Big One for Security Installers

The Construction Industry Scheme is the single most important thing to understand if you work as a subcontractor. CCTV, alarm, intruder and access-control installation that forms part of construction, fit-out, refurbishment or new-build work is generally within CIS. When a contractor (a security firm, electrical contractor or main builder) pays you, they must deduct tax from your labour before you see the money and pay it to HMRC.

• CIS-registered: the contractor deducts 20% from your labour element.
• Not registered: the deduction jumps to 30%, so register with HMRC as a subcontractor.
• Gross payment status: larger, established businesses can apply to be paid with no deduction.

Crucially, CIS is deducted from your labour only, not from the materials you supply, provided your invoice splits them out clearly. So always itemise cameras, NVRs, cable and brackets separately from your labour charge, or the contractor may deduct 20% from the lot. Pure maintenance and monitoring contracts, and work billed directly to a private homeowner, normally fall outside CIS. Our dedicated guide on the CIS subcontractor rules walks through registration, verification and deduction statements in full.

Why CIS Installers Usually Get a Refund

Here is the part many installers do not realise. The 20% CIS deduction is taken off your gross labour with no regard for your personal allowance or your expenses. But your real tax bill is calculated on profit after costs, and after the first GBP 12,570 is tax-free. Because a busy installer racks up serious deductions, van, fuel, tools, cable, insurance and training, the tax actually due is almost always less than what has already been deducted at source. HMRC repays the difference, and for a full-time subcontractor that refund is frequently a four-figure sum.

To get it you have to file Self Assessment and total your CIS deductions against your tax. Estimate the position with the CIS tax calculator, then sanity-check the whole picture, including any direct non-CIS jobs, with the sole trader tax calculator. The single rule that protects your refund is simple: keep every CIS deduction statement, because that paperwork is what proves the tax was taken.

Allowable Expenses for a CCTV Installer

An expense is allowable when it is incurred wholly and exclusively for the business. For a security installer the list is dominated by the van, tools, stock and the costs of working at height and on site.

Van, Mileage and Tools in Detail

Your vehicle is usually the largest running cost. You can claim the actual business proportion of fuel, insurance, tax, servicing and repairs, or use HMRC's simplified mileage rate of 45p per mile for the first 10,000 business miles and 25p after that. You cannot mix the two methods on the same vehicle in the same year, so work it out both ways once. Heavy mileage between scattered jobs often favours the mileage method, while an expensive van with high running costs can favour actual costs. Tools, ladders, testers and a tower scaffold are typically written off in full in the year of purchase through the Annual Investment Allowance, so a year you re-kit can wipe out a big slice of profit.

What You Cannot Claim

The private share of a dual-use van, phone or broadband must be stripped out. Ordinary clothing is never allowable even if you only wear it for work; only genuine PPE and branded uniform count. Travel from home to a regular fixed base is commuting, not business travel, though travel between jobs and to varying sites is allowable. Fines, parking penalties and the cost of entertaining clients are not deductible.

Worked Example: An Installer on GBP 42,000

Take a CIS-registered installer who subcontracts for a security firm and also does some direct homeowner work, with GBP 42,000 of income for the year and GBP 6,000 of CIS already deducted from labour.

Income: GBP 42,000 (labour and recharged materials combined)

Allowable expenses:

• Van running costs and mileage: GBP 4,800
• Tools, ladders and a tower (AIA): GBP 2,200
• Consumables not recharged, small stock: GBP 900
• PPE, insurance and certification: GBP 1,300
• Phone, software and home-office admin: GBP 700
• Accountancy and bank fees: GBP 500
• Total expenses: GBP 10,400

Taxable profit: GBP 42,000 minus GBP 10,400 = GBP 31,600

Income Tax: GBP 31,600 minus GBP 12,570 = GBP 19,030 at 20% = GBP 3,806

Class 4 NIC: GBP 19,030 at 6% = GBP 1,142

Tax and NIC due: GBP 4,948. But GBP 6,000 of CIS has already been deducted at source, so the installer is owed a refund of roughly GBP 1,052 once the return is filed. That is the CIS effect in a nutshell, and why filing promptly after 6 April puts cash back in your pocket.

VAT and the Domestic Reverse Charge

You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period. Installers doing larger commercial jobs reach this faster than they expect because both materials and labour count toward the threshold. Once registered, the construction industry's domestic reverse charge usually applies when you subcontract for another VAT-registered contractor: instead of charging them VAT, you note that the reverse charge applies and they account for it. This stops the cash-flow advantage of holding VAT, but it also removes a common headache. For direct work billed to homeowners, who cannot reclaim VAT, registration simply raises your prices, so think hard before registering voluntarily if most of your work is retail.

National Insurance for Installers

On top of Income Tax you pay Class 4 NIC at 6% on profit between GBP 12,570 and GBP 50,270, then 2% above. Class 2 NIC is collected through Self Assessment and, importantly, protects your State Pension and benefit entitlement. If a lean year leaves your profit below the small-profits threshold, consider paying Class 2 voluntarily to keep your contribution record intact. Remember that CIS deductions cover Income Tax and Class 4 only at the point of payment in a rough sense; your NIC is finalised through the return like everything else.

MTD for Income Tax: What Changes for Installers

Making Tax Digital for Income Tax replaces the once-a-year return with quarterly digital submissions and a year-end finalisation. The thresholds are based on gross income, not profit:

• April 2026: Combined trading and property income over GBP 50,000
• April 2027: Over GBP 30,000
• April 2028: Over GBP 20,000

For a CCTV installer the key trap is that the test is on turnover including materials, so a sole trader who supplies a lot of kit can cross GBP 50,000 of gross income while making a far smaller profit. Instead of bagging up a shoebox of receipts each January, you will record each invoice, CIS statement, fuel fill and material purchase digitally as it happens and send HMRC a quarterly summary. For a trade with steady, frequent transactions that is actually a sensible rhythm. Our guide to MTD for sole traders shows what the quarterly cycle looks like in practice.

Common Mistakes CCTV Installers Make

Not splitting labour and materials on invoices. If your invoice does not separate them, the contractor can apply the 20% CIS deduction to the whole amount, including kit, costing you cash flow until you reclaim it.

Staying unregistered for CIS. The deduction is 30% rather than 20% until you register as a subcontractor, so you hand HMRC more of your money to sit on until you file.

Losing CIS deduction statements. Without them you cannot prove tax already paid, and your refund shrinks or stalls.

Mixing the mileage and actual-cost methods. Pick one per vehicle per year; switching mid-year is not allowed.

Forgetting the VAT reverse charge. Charging a VAT-registered contractor VAT when the reverse charge applies creates errors on both sides.

People also ask

Does a self-employed CCTV installer fall under CIS?

What expenses can a security installer claim against tax?

Why do CIS subcontractors get a tax refund?

When does Making Tax Digital apply to CCTV installers?