Self-Employed Bike Mechanic Tax Guide 2026/27
Mobile and workshop-based self-employed bike mechanics have specific tool, parts-markup and premises questions. How 2026/27 Self Assessment treats them.
Quick answer
Bike mechanics run a fairly standard trades-based self-employed business, with the main nuance being how parts and stock are treated compared with labour income — parts bought in and fitted are cost of goods sold, not a simple expense to be written off regardless of whether they've been used yet.
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Torque wrenches, truing stands, tyre levers, cassette and bottom-bracket tools, and workshop stands are allowable — lower-cost items as straightforward revenue expenses, higher-value equipment (a full workshop stand and tool wall, for a fixed premises) potentially via the Annual Investment Allowance.
Parts, stock and mark-up
Components bought in specifically to fit for a customer during a repair (chains, cassettes, brake pads, inner tubes) are treated as cost of goods sold rather than a simple overhead — the customer's payment for parts is business income, and the original purchase cost is deducted against it, with the mark-up forming part of taxable profit. A mechanic who also holds retail stock (bikes for resale, accessories on a shop shelf) needs to value unsold stock at year end using cost or lower net realisable value, since unsold stock isn't yet an expense — it only becomes one when sold or written off.
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Open VAT calculatorPremises: workshop rent vs home-based
A rented workshop or unit used exclusively for the business is fully allowable, including rent, business rates (where applicable) and utilities. A mechanic working from a home garage or shed can instead claim a proportion of home running costs via HMRC's simplified flat-rate scheme or apportioned actual costs, based on the extent of business use.
Mobile mechanics and vehicle costs
Mobile bike mechanics who travel to customers' homes or workplaces claim vehicle costs either via the simplified mileage rate (45p/25p) or a proportion of actual running costs — not both for the same vehicle — chosen consistently from year to year.
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Frequently asked questions
Can a bike mechanic claim for tools as a business expense?
Yes, tools such as torque wrenches, truing stands and specialist cassette or bottom-bracket tools are allowable, either as direct expenses or via capital allowances depending on their cost and expected working life.
How are parts fitted during a bike repair treated for tax?
Parts bought in to fit for a customer are treated as cost of goods sold — the amount the customer pays for parts is business income, and the original cost of buying them is deducted against it, with the difference (mark-up) forming part of taxable profit.
Do I need to value unsold bike stock at the end of the tax year?
Yes, if a mechanic also holds stock for resale (bikes, accessories), unsold stock at the year end needs to be valued, usually at cost or lower net realisable value, since it is not yet an expense until it is sold or written off.
Can a mobile bike mechanic claim mileage?
Yes, via the simplified mileage rate (45p per mile for the first 10,000 business miles, 25p after) or a proportion of actual vehicle costs — not both for the same vehicle, chosen consistently.
Is workshop rent tax deductible for a self-employed bike mechanic?
Yes, rent, business rates and utilities for a workshop or unit used exclusively for the business are fully allowable expenses.
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