Tax Guide for Self-Employed Glaziers
What expenses can a self-employed glazier claim? CIS deductions, glass tools, van racking, FENSA fees — with a worked tax calculation and refund example.
Tax Essentials
- CIS Status
- Yes — 20% deduction
- Typical Income
- £28,000–£40,000
- HMRC Flat Rate
- £120/year (tools & clothing)
- VAT Threshold Risk
- Monitor turnover
- Industry Body
- Glass and Glazing Federation
- Key Certifications
- CSCS card (Blue Skilled Worker) · NVQ Level 2 in Glazing · FENSA registration (for replacement windows/doors)
Self-employed glazier tax can be straightforward once you know what to claim. Glazing installation is construction work that falls under the Construction Industry Scheme (CIS) — if you work as a subcontractor fitting windows, doors, or glass panels on site, your contractor deducts 20% from your payments and sends it to HMRC. At the end of the tax year, you file Self Assessment, and the expenses you claim often mean a significant refund.
Glaziers carry specialist tools and transport fragile materials, which means higher spending on glass handling equipment, van modifications, and replacement PPE than most construction trades.
Glazier Allowable Expenses: What You Can Claim
| Expense | Examples | Typical Annual Cost |
|---|---|---|
| Glass handling tools | Bohle Silberschnitt glass cutter ( | £200–£600 |
| Hand tools | Putty knives, glazing hammers, sealant guns, glass drill bits, window scrapers | £100–£300 |
| PPE & workwear | Cut-resistant gloves (Level 5), safety goggles, steel-toe boots, hard hat, hi-vis | £200–£400 |
| Consumables | Silicone sealant cartridges, glazing putty, pins, cutting fluid, cutter wheels | £400–£900 |
| Vehicle costs | Van fuel, insurance, MOT, servicing, road tax | £3,500–£5,500 |
| Van glass racking | Vanax or similar internal A-frames and glass racks (~£1,500–£2,200 fitted) | One-off (AIA) |
| Insurance | Public liability ( | £120–£350 |
| FENSA & certifications | FENSA annual fee ( | £200–£500 |
| Phone | Mobile contract (business portion), job management apps | £100–£250 |
| Accounting fees | Tax return preparation, bookkeeping | £150–£400 |
Vehicle Costs and Glass Racking
Glaziers rely on a van fitted with internal glass racks or A-frames to transport panes safely. The racking itself (£1,500–£2,200 from suppliers like Vanax) qualifies for the Annual Investment Allowance — deduct the full cost in the year you buy. For the van itself, you can claim either the simplified mileage rate (45p/mile for the first 10,000, then 25p) or actual costs. At 10,000 business miles, the mileage method gives you £4,500. Once you pick a method for a vehicle, you stick with it.
FENSA and Certifications
- FENSA registration — required if you install replacement windows or doors. Application fee ~£267 + VAT (one-off), then ~£172 + VAT per year. Fully deductible
- CSCS Blue Skilled Worker card — needed for site access. Requires NVQ Level 2 in Glazing plus the CITB HS&E test (~£58 combined, valid 5 years)
- NVQ Level 2 in Glazing — on-site assessment fees (~£750 + VAT) are deductible as training that maintains your existing skills
HMRC Flat Rate Alternative
HMRC allows a £120/year flat rate deduction for tools and specialist clothing for glaziers. For most glaziers, consumables and PPE alone exceed this — claim real figures with receipts.
Expenses Glaziers Can't Claim
- Commuting to a regular site — travel to the same location for over 24 months isn't deductible. Travel between different sites and short-term jobs is
- Glass stock you supply to customers — if a customer pays you to supply and fit glass, the glass itself is stock, not an expense. It reduces your profit but is accounted for differently
- Everyday clothing — jeans and jumpers don't qualify even if you only wear them on site. Only specialist PPE counts (cut-resistant gloves, safety goggles, steel-toe boots)
- Your original glazing qualification — your initial NVQ or apprenticeship isn't deductible. Only renewals, FENSA fees, and CPD courses count
- Food and drink — not deductible unless you're working away from your normal area overnight
- Fines and penalties — parking tickets, PCNs, late filing penalties
Example: How Much Tax Does a Glazier Pay?
Tom works as a self-employed glazier through CIS. Here's his 2025/26 tax year:
| Item | Amount |
|---|---|
| CIS income (gross) | £35,000 |
| CIS deducted (20%) | £7,000 |
| Consumables (sealant, putty, cutting supplies) | −£700 |
| Vehicle costs (mileage) | −£4,500 |
| PPE, tools, and glass handling equipment | −£500 |
| FENSA, CSCS, insurance, phone, accounting | −£800 |
| Taxable profit | £28,500 |
| Income Tax (after £12,570 personal allowance) | £3,186 |
| Class 4 NI (6% on £12,570–£50,270) | £956 |
| Total tax + NI due | £4,142 |
| CIS already deducted | £7,000 |
| Refund due | £2,858 |
For 2025/26, Class 2 NI is no longer charged separately — you receive NI credits automatically if your profits exceed £6,845.
Without claiming expenses, his refund would be just £1,168. Expenses save Tom £1,690 — and most of that is mileage and consumables he'd spend anyway. You can claim back your CIS deductions through your Self Assessment return.
Record Keeping Tips for Glaziers
- Log every sealant and consumable purchase — silicone cartridges, putty, and cutting fluid add up fast but are easy to forget. Keep a running total or photograph Screwfix and Toolstation receipts on the day
- Record van mileage daily — glaziers travel between sites constantly. Note the site address, round-trip mileage, and purpose of each journey in a diary or app
- Save your CIS payment statements — you need these to reclaim the 20% deduction. Chase your contractor for missing ones before January
- Keep the van racking invoice separately — this is a capital allowance claim, not a running expense. Store the invoice with a note of the fitting date and van registration
- Track FENSA and CSCS renewal dates — FENSA runs annually from 1 January; CSCS cards last 5 years. Claim the renewal fees in the year you pay them
Key Deadlines
| Deadline | What |
|---|---|
| 5 April | Tax year ends — finalise your income and expense records |
| 31 January | File Self Assessment and pay any tax owed (or receive your refund) |
| 31 July | Second payment on account (if applicable) |
If this is your first year, register for Self Assessment by 5 October after the tax year ends.
VAT Threshold
With day rates of £160–£400, glaziers who also supply glass can approach the £90,000 VAT threshold (2025/26) more quickly than labour-only subcontractors. If you supply and fit — rather than just fit — your turnover includes the glass value. Monitor your rolling 12-month turnover, which is based on income, not profit. Read more about how VAT interacts with CIS.
This guide is for informational purposes only and does not constitute tax, legal, or financial advice. Tax rules change frequently. Always verify current requirements on GOV.UK or consult a qualified accountant for your specific situation.
Official Sources
- Expenses if you're self-employed — GOV.UK
- Construction Industry Scheme — GOV.UK
- Simplified expenses for vehicles — GOV.UK
- Self-employed National Insurance rates — GOV.UK
- Check if you need to register for VAT — GOV.UK
- FENSA installer registration — FENSA