Joiners and carpenters working under CIS typically supply both labour and significant materials (timber, sheet materials, fixings, hardware). Getting the split right on every job is critical to avoiding overpayment. Combined with mileage, tools and PPE, the allowable expenses available to a self-employed joiner or carpenter are considerable.
Timber, sheet materials, ironmongery and fixings you supply for a job are all excluded from CIS deductions. The 20% rate applies only to the labour element. Many main contractors either do not separate the two, or use a rough estimate rather than the actual materials cost. We review your deduction slips and identify where overpayment has occurred.
Joiners and carpenters typically have substantial tool and equipment costs: table saws, routers, planers, chisels, clamps, vans. Capital allowances let you claim the cost of tools and equipment against your taxable income. We ensure every qualifying item is included.
A joiner's van is essential and expensive. You can claim the actual running costs (fuel, insurance, repairs, road tax, finance interest) or use the mileage rate of 55p per mile from April 2026. We model which approach produces the larger deduction for your specific usage.
We calculate your full refund, verify the deduction base on your monthly statements, account for all allowable expenses, and submit your Self Assessment return. We handle any follow-up with HMRC.
Once your annual CIS turnover exceeds £30,000 net of materials, you may qualify for GPS and receive payments without any deduction. We handle the application and maintain the compliance record that keeps it in place.
Annual Self Assessment, income and expense records, and Making Tax Digital preparation from April 2026 if your gross income exceeds the threshold.
Book a free call. We will talk through your CIS position, your deduction history and whether there is anything worth changing. No hard sell, no obligation.
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