Quick answer
Sole traders claim the business proportion of phone costs: work out the business share of calls and data and deduct that slice of the bill. Limited companies do better with a contract in the company’s name: one mobile phone per employee is a tax-free benefit, private use included. Reimbursing a personal contract is the worst of both worlds, taxable except for identifiable business calls. VAT follows the same business-use split.
Is a phone tax deductible in the UK?
Yes, to the extent of business use, and the structure of the contract decides almost everything. For the self-employed, a phone used for both work and life is a mixed-use cost, so only the business proportion is allowable. GOV.UK’s worked example is usefully blunt: mobile bills of £200 for the year, £130 personal and £70 business, gives a £70 deduction. There is no fixed percentage that HMRC accepts by default; the split has to come from your actual usage.
For a limited company, the mobile phone exemption is one of the cleanest reliefs in the system. The company may provide one phone or SIM card per employee, on a contract between the employer and the supplier, and the whole cost is deductible for the company with no benefit-in-kind for the employee, even with unlimited private use. Directors count as employees for this purpose. The exemption is per person, not per role: a second handset for the same employee is a taxable benefit.
The trap sits in the middle: the company paying or reimbursing a contract that is in the employee’s own name. That arrangement is outside the exemption, so the payment is treated as earnings, with tax and National Insurance consequences, except for the identifiable cost of business calls. Salary-sacrifice phone arrangements also fall outside the exemption and must be reported.
How much can you claim?
| Arrangement | What is claimable |
|---|---|
| Sole trader, personal contract | Business proportion of calls, data, and the handset |
| Company contract, one phone per employee | 100%, no benefit in kind |
| Company reimburses employee’s own contract | Identifiable business calls only; the rest is earnings |
Worked example: a freelance designer pays £45 a month on a personal SIM-only contract. Reviewing three months of bills, roughly 60% of usage (calls, data, hotspot) is client work. The annual claim is £45 x 12 x 60%, which is £324. A bookkeeping practice running as a limited company instead puts each of its three staff on company-contract handsets and deducts the full cost with nothing to report.
VAT on phone costs
Input VAT is recoverable at the business proportion. HMRC’s example is a 50/50 phone: half the calls personal means 50% of the VAT on both the handset and the service plan is reclaimable. On a wholly business contract, the full VAT is recoverable. Keep the VAT invoices from the network; a direct-debit reference on a bank statement is not enough.
Record-keeping requirements
Keep the contract, the bills, and the working that produced your business-use percentage, such as a marked-up itemised bill for a representative period. Self-assessment records must survive at least 5 years after the 31 January deadline, VAT records at least 6 years. For company phones, keep evidence that the contract is in the company’s name; that single fact is what the exemption stands on.
How to claim, step by step
- Identify whose name the contract is in. Company name: full deduction, no benefit in kind. Personal name: apportion.
- For a personal contract, review an itemised bill over a representative period and set a defensible business percentage.
- Apply the percentage to the year’s bills and the handset cost, and enter it in the phone and office costs box of the SA103, or post the company contract to the phone expense account.
- Reclaim VAT at the same percentage on each return, holding the VAT invoices.
- For companies, provide at most one phone per employee under a company contract and skip the P11D entirely.
- Revisit the percentage when your usage pattern changes; a stale split is easy for an enquiry to pull apart.
Common mistakes
- Claiming 100% of a personal contract because the phone is “mainly for work”. The claim needs a usage-based split.
- Reimbursing an employee’s personal contract and treating it as tax-free. Outside the exemption, that is earnings.
- Providing two phones to one employee under the exemption. It covers one phone per employee.
- Reclaiming full VAT on a mixed-use phone.
- Losing the itemised bills that justify the percentage, leaving the claim unevidenced at enquiry.
Software that helps
- Dext captures the monthly phone bill from a forwarded email and codes it to the right account.
- ExpenseFlow reads phone bills with frontier vision AI, applies the business-use split you configure for mixed-use costs like a personal-contract phone instead of a 100% claim, and syncs the approved amount to Xero or QuickBooks with the bill attached.
- Hubdoc fetches bills directly from the major UK networks each month so the paper trail keeps itself.
FAQ
See the answered questions above for the business-use split, the company phone exemption, reimbursements, VAT, and handsets.
From ExpenseFlow
VAT coding on autopilot
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