Business Mobile Expenses & VAT: What You Can Claim (2026)

The tax and VAT side of business mobile is where a lot of money quietly leaks - either because businesses don't claim what they're entitled to, or because they get the structure wrong and create a tax charge they didn't need to. The rules aren't complicated once you see them, but they do hinge on details that are easy to miss: whose name the contract is in, whether you're a sole trader or a limited company, and how you handle staff who use their own phones. This guide walks through what you can generally claim in 2026 and the traps to avoid. One important caveat up front: this is general guidance, not tax advice - the right answer depends on your circumstances, so always confirm the detail with your accountant. And if you want to make sure the contracts are structured cleanly in the first place, get a business mobile quote.

First principles: business use is what matters

Underneath all the detail, the tax system asks one question about your mobile costs: is this expenditure for the business? If it is, it's generally deductible for the business and the VAT is generally recoverable (if you're VAT-registered). Where it gets fiddly is mixed use - a phone that's used for both work and personal life - and where the contract sits between the individual and the business.

Two structural facts drive almost everything that follows:

1. Whose name is on the contract - the company's or the individual's.
2. Your business type - sole trader/partnership (where you and the business are the same for tax) or limited company (a separate legal person with its own tax).

Get those two right and most of the rest falls into place.

The company mobile phone benefit-in-kind rule (limited companies)

This is the one that trips people up, and it's worth getting right because it can turn a tax-free perk into a taxable one with a single paperwork choice.

In general, an employer can provide one mobile phone to an employee with no taxable benefit-in-kind, including reasonable private use, provided the contract is between the employer and the phone provider - in other words, in the company's name. That exemption is a genuinely useful planning point: the company gets the deduction and recovers the VAT, and the employee gets a phone they can also use personally, with no tax charge on either side.

The trap is the contract name. If the phone contract is in the employee's name and the company pays or reimburses it, you generally fall outside the exemption - and the payment can become taxable earnings or a benefit, often with National Insurance to deal with too. Same phone, same usage, very different tax outcome, decided purely by whose name is on the agreement.

A few practical points to confirm with your accountant:

• The exemption is generally for one phone per employee - additional phones may be treated differently.
• It's about the phone - providing other benefits alongside it doesn't extend the exemption.
• The "company name on the contract" point is the bit people most often get wrong, especially when staff sign up themselves and expense it.

The takeaway: if you want to give staff company phones tax-efficiently, put the contracts in the company's name from the start. That's free to do and avoids an unnecessary tax charge.

VAT recovery on business mobiles

If your business is VAT-registered, you can generally recover the VAT on mobile costs to the extent they relate to business use. How that plays out depends on the situation:

• Phones used only for business. VAT is generally fully recoverable.
• Company phones with some incidental private use, where you don't charge staff for that private use. In practice HMRC's approach generally allows recovery of the VAT on the standing/tariff charges, while private call usage may need to be accounted for - the exact treatment depends on your circumstances and how private use is handled.
• Mixed-use lines (especially sole traders). You recover the VAT relating to the business proportion and not the private part.
• You charge employees for private use. That changes the VAT position again, as you're effectively making a supply to them.

Because the precise mechanics depend on how you provide and charge for the phones, this is exactly the area to agree a consistent, documented method with your accountant - and then apply it the same way every quarter. Keep the VAT invoices (a bill in the business name with a VAT number on it), because without a valid VAT invoice you can't reclaim the VAT regardless of the business use.

Sole traders and the self-employed

If you're a sole trader, you and the business are the same person for tax, so the question is simpler but the discipline matters more. You claim the business-use proportion of your mobile costs as an allowable expense:

• A line used wholly and exclusively for the business is the cleanest - the full cost is generally deductible, and if you're VAT-registered the VAT is generally recoverable.
• A single phone used for both work and personal life means apportioning - claiming a fair, justifiable percentage of the cost as business. Keep a sensible basis for the split.

This is the strongest practical argument for giving your work a separate line (often a second eSIM on the same handset): a dedicated business line removes the apportionment headache entirely. We cover the setup in our guide to business mobile for sole traders and freelancers. As always, confirm the right approach with your accountant - HMRC expects the business proportion to be reasonable and supportable.

BYOD: reimbursing staff phones is a tax minefield

Letting staff use their own phones (BYOD) saves on hardware, but the expenses and tax treatment is where it bites. The general principle is that paying or reimbursing an employee's personal phone contract is not the same as providing a company phone - and it can create taxable earnings and National Insurance, because the contract is in the employee's name.

There are cleaner ways to support BYOD - for example, providing a company SIM for the business line, or paying only for itemised genuine business calls - but the detail matters and gets technical fast. The honest advice: if you're running BYOD, design the reimbursement approach with your accountant before you set it up, not after a query lands. Our BYOD policy guide covers the operational side, and our comparison of business mobile vs personal phones weighs up why company-provided lines are often simpler all round - tax included.

What you can typically claim, at a glance

This table is a general illustration of the common treatment - your circumstances may differ, so treat it as a conversation-starter with your accountant, not a ruling:

The pattern is clear: company-name contracts and dedicated business lines are the clean, tax-efficient routes, while reimbursing personal contracts is where complexity and tax charges creep in.

How structure saves money beyond tax

Getting the tax structure right tends to line up with getting the cost right, which is why it's worth doing properly:

• Company-name contracts let you consolidate onto one account, recover VAT cleanly, and negotiate as a business rather than as scattered individuals.
• They make pooled data possible, which is usually the biggest single saving for a team - see our cost-saving guide.
• They keep numbers owned by the business, so you're not paying to recover a customer-facing number when someone leaves.

In other words, the same decision that's tax-efficient is also commercially efficient. If you'd like us to structure your business mobile cleanly across the right network - contracts in the company name, VAT-ready invoicing, pooled data - get a business mobile quote and we'll set it up to suit how you're taxed.

A quick expenses checklist

• Put company phone contracts in the business name to stay within the benefit-in-kind exemption.
• Keep one company phone per employee in mind as the simple, exempt baseline.
• Keep all VAT invoices in the business name - no valid invoice, no VAT reclaim.
• Sole traders: prefer a dedicated business line to avoid apportioning a mixed-use phone.
• Agree a consistent VAT and private-use method with your accountant and apply it every quarter.
• Treat any reimbursement of personal contracts as a tax question to settle with your accountant first.
• Review the setup whenever headcount, VAT status or how staff use phones changes.

The bottom line

The tax and VAT rules on business mobile reward something that costs you nothing: setting the contracts up correctly. Company-name contracts keep the benefit-in-kind exemption and clean VAT recovery; dedicated business lines keep sole-trader claims simple; and reimbursing personal phones is the route most likely to create an avoidable tax charge. None of this is a substitute for advice on your own numbers - so use this as your map, then confirm the detail with your accountant. When you're ready to get the contracts structured properly, get a business mobile quote and we'll handle the setup so the tax side starts clean.