Making Tax Digital for Glaziers —
Emergency Call-Outs & Glass Costs Explained
Emergency Boarding-Up and Scheduled Replacements Both Count
Glazing work splits fairly evenly between emergency call-outs (break-ins, accidents, storm damage needing urgent boarding-up and glass replacement, often at premium out-of-hours rates) and scheduled work (window and door unit replacements booked in advance). Every payment, however urgent or planned the job, counts identically towards your MTD qualifying income.
Glass and Unit Costs Are a Substantial Share of Each Job
Like other materials-heavy trades, your qualifying income is the full invoice amount — glass, sealed units, and framing materials included — before deducting what you paid your glass supplier or merchant. This is worth understanding clearly since glass costs can represent a large share of a job's total invoice value, meaning your gross qualifying income may look considerably higher than your actual margin.
Insurance Work, Emergency Jobs and Your Records
Glazing income is a mix of emergency call-outs, planned replacements and work paid for by insurers. The timing of payment differs for each, so your records need to show when the money actually arrived.
- Record insurer-paid jobs when the insurer pays you, and keep the claim reference with the invoice.
- For made-to-measure units, record the deposit on receipt and the balance on completion.
- Keep glass and unit supplier invoices matched to the job they were bought for, so the margin on each job is visible.
- Log emergency boarding-up and call-out premiums as normal income with a note of the date and time.
- Keep waste glass disposal, van racking and safety equipment receipts in their own categories.
Common Mistakes Glaziers Make
- Netting off glass cost from income. The threshold is tested on what you invoice, not on what is left after buying the glass.
- Waiting for the insurer before recording a job. You still need an accurate record of the work, even if payment arrives next quarter.
- Forgetting breakage and wastage. Spoiled or incorrectly measured glass is a business cost, so log it rather than burying it in materials.
- Missing CIS deductions. If a main contractor deducts tax from your payments, record the gross invoice and the deduction separately.
- Skipping vehicle mileage records. A fitted work van is still a vehicle with business and private use.
A Sample Quarter: What the Update Looks Like
A sample quarter for a glazier mixing planned replacements, emergency work and insurance jobs.
| Q2: 6 July to 5 October 2026 | Amount |
|---|---|
| Replacement units and domestic work | £14,200 |
| Emergency boarding-up and call-outs | £3,300 |
| Insurer-paid jobs received | £4,900 |
| Total income | £22,400 |
| Glass and units from suppliers | £9,100 |
| Van, racking and fuel | £2,200 |
| Waste and disposal | £380 |
| Insurance and tools | £640 |
| Total expenses | £12,320 |
| Profit for the quarter | £10,080 |
An insurer that pays in the next quarter moves that income into the next update, so keep the job record and the claim reference on file.
Worked Example
Emergency call-outs (gross, including glass and boarding materials): £19,800
Scheduled unit replacements (gross, including glass): £16,400
Total qualifying income: £36,200 — above the £30,000 Phase 2 threshold. Wren joins MTD from April 2027. The glass units he buys from his supplier are claimed as a business expense, but his qualifying income remains the full amount customers pay, both for scheduled work and premium emergency call-outs.
What You Can Claim
- Glass, sealed units, and framing materials — claimed at what you paid your supplier
- Van costs — fuel, insurance, or the 55p/mile mileage rate
- Tools and equipment — glass cutting and handling equipment, usually claimed in full
- Public liability insurance
- Boarding-up materials kept on hand for emergency call-outs
- Trade merchant account fees
Best MTD Software for Glaziers
Software links are affiliate, help fund CheckMyMTD. Recommendations based on ease of use for self-employed income tracking.
Frequently Asked Questions
Does an emergency out-of-hours call-out count differently to scheduled work?
No, however your pricing varies by urgency, every payment counts identically towards your qualifying income.
Is my qualifying income the glass price, or my margin after what I paid the supplier?
It's the full amount you invoiced the customer, including the glass or unit. What you paid your supplier is claimed back separately as a business expense.
My gross income looks high because of glass costs, but my actual profit is much lower. Does that matter for MTD?
No, MTD eligibility is based on your gross qualifying income, not your profit margin, which is worth being aware of given how material-heavy this trade is.
Can I claim boarding-up materials I keep in stock for emergencies?
Yes, materials and consumables kept on hand for your work are a normal allowable business expense.
Do domestic and commercial glazing jobs combine into one figure?
Yes, all self-employment income combines into a single qualifying income figure regardless of whether the client is domestic or commercial.