Self-employed plumbers and heating engineers are taxed on profit after materials, tools, van costs, insurance and certification. Working under CIS? The CIS calculator handles your deductions and refund.
Often, if you subcontract for a contractor. If CIS is deducted from your pay, use the CIS tax calculator instead.
On your profit — income minus allowable expenses. You pay income tax above your personal allowance, plus Class 4 National Insurance on profit above the threshold.
Costs incurred wholly for your work — tools, materials, travel, phone, insurance and more. Keeping them recorded reduces your taxable profit.
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