IT support technicians: components, software licences, and quarterly MTD updates

One computer repair can involve an SSD bought from a trade supplier, an annual diagnostic licence, an hour of labour and a customer payment that covers the lot. Recording only the labour margin understates the business you have actually done.

For independent IT support technicians, good tax records should connect the job, the parts and the payment. Making Tax Digital adds regular reporting to that process, without changing the principle that genuine business costs reduce taxable profit.

When Making Tax Digital applies

Making Tax Digital for Income Tax changes how qualifying sole traders and landlords keep records and report income. Under HMRC’s timetable, the starting points are:

• From 6 April 2026, if qualifying income exceeded £50,000 in 2024–25.
• From 6 April 2027, if qualifying income exceeded £30,000 in 2025–26.
• From 6 April 2028, if qualifying income exceeded £20,000 in 2026–27.

Qualifying income generally means gross self-employment and property income combined, before expenses. Salary, pension income and dividends do not count towards this particular test. Check HMRC’s qualifying income guidance, including the treatment of VAT and shorter accounting periods where relevant.

The test uses the relevant earlier tax year; passing a figure during a busy month does not mean you join that day. Exemptions can apply. These rules concern your individual business and property income, rather than a limited company’s Corporation Tax reporting.

Customer components belong in gross turnover

When you buy components in your own name and supply them as part of a repair, the customer's payment normally forms part of your business income. This remains true if you charge the SSD, RAM module or power supply at cost. Record the component purchase separately as a business expense.

That is different from a customer ordering and paying for their own part directly. In that case, you may earn only the fitting or diagnostic fee. The contract and invoices establish the difference; a description such as “reimbursement” does not do it by itself.

Keep supplier credits for faulty screens and returned parts. If a replacement is supplied without another charge, do not invent a second purchase expense. A simple job reference can connect the original order, warranty replacement and customer invoice.

Hardware stock, tools and software

Section 34 of the Income Tax (Trading and Other Income) Act 2005 requires a business purpose for deductions. HMRC explains how business and private costs are distinguished.

For the cash basis, eligible parts and most equipment are generally deducted when paid for. Traditional accounting can require stock adjustments and capital allowances for equipment. Neither method allows tax relief for accounting depreciation itself.

Ongoing software subscriptions used for the trade are usually running costs. A substantial one-off acquisition of intellectual property or a different type of licence may need closer analysis. Keep the agreement as well as the payment evidence, especially where the invoice bundles hardware, software and support.

Home test-bench costs and customer visits

A repair bench can use more electricity than an ordinary desk. If you claim actual home costs, make a reasonable allocation supported by your bills and working pattern. Meter readings or the power consumption and operating hours of testing equipment can help explain a material claim.

You can compare actual costs with the simplified homeworking rates: £10, £18 or £26 a month, depending on qualifying hours. Business telephone and internet use can be considered separately from those flat rates. Do not add the same household running costs twice.

For mobile callouts, retain a journey record. An eligible car or van can use simplified mileage, subject to the existing-claim restrictions, or actual vehicle costs. Travel between customer sites is different from ordinary travel to a fixed workplace; working occasionally at home does not automatically make every departure a business journey.

Worked example: a repair paid by card

Dan is not VAT registered and uses the cash basis. He charges £180 for an SSD and £120 for installation and data migration. The component cost him £180, and the card processor deducts £6.

• Business income is £300.
• The component expense is £180.
• The processing expense is £6.
• The contribution before other overheads is £114.

The £294 bank settlement is not turnover, and the £114 contribution is not qualifying income for MTD. Reporting either as the sale would hide part of the transaction. All amounts in this example are illustrative and assume the part is bought and the customer pays within the relevant cash-basis reporting period.

Build a short, useful review process

Review unreconciled parts purchases, customer refunds and subscription renewals regularly. Mark your own transfers and borrowing so they are not mistaken for support fees. Where customers pay a monthly support retainer, keep the service agreement and record ordinary advance receipts when received under the cash basis.

A technical-looking merchant name is not proof of business use: a graphics card for a private gaming computer still needs excluding. Avona AI can support categorisation, while your job records explain the purpose and any split. You do not need to include customer passwords, network diagrams or sensitive support notes in the tax record.

A manageable quarterly routine

For a business using standard tax-year periods, the 2026–27 quarterly update deadlines are 7 August 2026, 7 November 2026, 7 February 2027 and 7 May 2027. Updates are cumulative: each covers the tax year so far. Calendar update periods are also available, with the same deadlines.

Keep digital income and expense records, reconcile them regularly and send the required totals through compatible software. The Income Tax (Digital Obligations) Regulations 2026 underpin the requirements; HMRC’s digital record-keeping notice explains the applicable directions. A bank feed needs supporting detail wherever a payment conceals fees, private purchases or several transactions.

Normally, record the transaction date, amount and relevant category, retaining supporting invoices or receipts. HMRC’s digital records guidance explains permitted simplifications and digital links where more than one software product is used.

Quarterly updates do not replace the annual tax return. The 2026–27 return is due by 31 January 2028, and normal tax payment dates continue. HMRC is not applying late quarterly update penalties for 2026–27, but digital records and updates are still required. That first-year approach does not waive other filing or payment obligations.

Give the records the same care as the repair

Clear parts records and complete customer receipts make quarterly reporting much easier to assess. Explore Avona.app at £15/month for self-service bookkeeping, or Avona Concierge, managed by chartered accountants, starting from £60/month, if you would prefer help with the accounting and reporting.