Carpenters and joiners: timber yard trade accounts, workshop costs, and MTD

A bespoke cabinet can involve a timber-yard order, several days in the workshop and a final visit to fit it. A kitchen installation might reverse the pattern: most of the time is on site, with tools and materials moving between the van and the job.

Those differences matter when keeping tax records. Materials, machinery, workshop overheads and travel all belong to the business, but they do not always receive identical treatment.

Making Tax Digital for Income Tax adds regular updates. A useful system should also show whether your quoted price covers the timber, finishing work and installation costs involved.

Start with gross income when checking MTD

For sole traders, MTD entry generally depends on qualifying income before expenses. Income from other sole-trader businesses and relevant property income is combined; PAYE salary and dividends are excluded from that test.

The timetable is 6 April 2026 for more than £50,000 in 2024–25, 6 April 2027 for more than £30,000 in 2025–26, and 6 April 2028 for more than £20,000 in 2026–27. Exemptions may apply. HMRC’s entry guidance sets out the rules.

The relevant year matters: a large order this month does not create an immediate switch that day. Limited companies and partnerships also need a different assessment.

Worked example: the customer’s price includes the timber

Imagine a sole-trader joiner supplies and fits shelving for £3,200. The business is not VAT registered and the figures are illustrative.

The sales figure is £3,200, with £1,700 of separate direct costs. Your own labour is not a deductible wage simply because you put an hourly value on it when pricing the work.

Repeating a job with that sales value 17 times produces £54,400 of income, before other work. That illustrates why substantial material costs can coexist with an MTD entry obligation. HMRC explains the gross qualifying-income test.

Keep timber purchases connected to jobs and stock

A timber-yard statement can cover hardwood, sheet materials, hinges, fixings and deliveries for several jobs. Keep individual invoices and credit notes so you can identify what was bought and where it went.

Useful distinctions include:

• Materials bought for a named customer job.
• Stock held for future work.
• Consumables such as adhesives, abrasives and sealants.
• Reusable tools and machinery.
• Purchases taken for private DIY or other personal use.

Section 34 of the Income Tax (Trading and Other Income) Act 2005 provides the business-purpose test. HMRC explains the requirement. Applying it means a personal timber purchase should not remain in the deduction merely because it was charged to the trade account.

Under cash basis, allowable material purchases normally follow payment. Traditional accounting may require adjustments for stock, creditors and work in progress. A cut list or simple job sheet remains commercially useful under either method: it can show where an extra sheet or damaged panel affected the margin.

Claim workshop running costs with clear evidence

Commercial workshop rent, business rates, power and relevant insurance can normally qualify as business costs. HMRC’s premises guidance explains the general categories.

Keep three-phase power charges, dust-extraction servicing, blade sharpening, waste collection and routine machinery maintenance identifiable. These records can also help you see which overheads rise with production and which continue during a quiet month.

For a workshop at home, do not claim the entire household bill automatically. Establish an appropriate business share and keep the calculation. Domestic garage use, shared electricity and alterations to a building can need different consideration from renting a wholly commercial unit.

Separate repair work from substantial improvements. Replacing a worn component is not necessarily the same as installing a new extraction system or extending the workshop. Describe what the invoice actually covers so the correct tax treatment can be applied.

Distinguish machinery purchases from depreciation

A table saw, CNC machine or dust extractor can represent a major investment. Tax relief depends on the accounting method, the asset and any financing arrangement.

For eligible cash-basis businesses, qualifying equipment bought outright is normally deducted when paid for. HMRC’s cash-basis capital-expenditure guidance explains the treatment and exceptions.

Under traditional accounting, plant and machinery normally receives relief through capital allowances. Qualifying expenditure may be covered by annual investment allowance, subject to the conditions and available limit. HMRC explains AIA.

Accounting depreciation is not itself the tax deduction. Avoid claiming the machine’s purchase, depreciation and capital allowances as if they were three separate costs.

Keep smaller tool spending understandable

Router cutters, cordless-tool batteries, track-saw accessories and replacement blades can appear on the same invoice as a major tool. Keep enough detail to distinguish replacement consumables, maintenance and equipment purchases.

If an item is financed, keep the agreement. Loan principal, interest, hire purchase and rental arrangements should not all be categorised simply as “tools”. When you sell or part-exchange old equipment, retain that record too; the proceeds may affect the tax calculation.

Separate workshop journeys from site installation travel

A regular journey from home to a permanent workshop is not automatically deductible. Journeys from the workshop to customers or between business sites can have a different treatment.

If you genuinely work from a home business base and travel to temporary jobs, the facts require assessment. HMRC’s guidance on travel to and between sites explains the importance of the base of operations and working pattern.

Record the date, destination and reason for site visits, deliveries and collections. A mileage log can distinguish installing a customer’s kitchen from collecting material for your own house.

For the van, choose an appropriate actual-cost approach or eligible simplified mileage. Avoid duplicating fuel and other costs covered by a mileage rate. Keep leasing or purchase agreements, racking invoices and any private-use calculation available.

Check whether installation work brings CIS duties

Manufacturing joinery and installing it on a construction site can produce different CIS questions. Do not assume that every workshop sale is a construction payment, or that adding fitting has no effect.

If a contractor deducts CIS from your payment, record gross income and the tax withheld separately. If you pay construction subcontractors, you may also have contractor duties. HMRC’s CIS overview is the starting point for checking the arrangement.

Keep the contract and scope of work so supply-only work can be distinguished from supply-and-install contracts. A merchant-style invoice description should not substitute for the actual facts.

Build your quarterly review from completed jobs

The Income Tax (Digital Obligations) Regulations 2026 and HMRC’s quarterly reporting direction govern the reporting framework.

Standard 2026–27 updates are due on 7 August 2026, 7 November 2026, 7 February 2027 and 7 May 2027. They accumulate from 6 April. HMRC explains the update periods.

Review customer deposits, final payments, material returns and mixed invoices. Under cash basis, ordinary advance payments generally count when received, even if fabrication or installation happens later.

The annual 2026–27 return is due by 31 January 2028. Updates do not introduce quarterly tax payments, and first-year quarterly penalty relief does not remove annual filing or payment obligations.

Choose a routine that supports the craft

Clear records make it easier to see whether workshop production and site installation are both paying their way. Avona.app costs £15/month, with Avona AI helping categorise transactions for review. Keep itemised timber invoices and stage-payment records so the suggested categories can be checked.

For managed support from chartered accountants, Avona Concierge starts from £60/month. Explore the Avona options and choose the support that fits the way you work.