4.3/5 TrustpilotOFCOM regulated
← Back to Blog

Business Mobile End-of-Tax-Year Review UK (2026): What to Check

Last updated: April 2026

UK tax year ends 5 April for individuals and sole traders, with corporation tax periods varying by company year-end. April is also when annual mobile price increases hit. Combine the two and end-of-tax-year is the right time for a business mobile review.

Tax claims — make sure you're claiming everything

For sole traders

  • Business mobile contract: 100% allowable as expense (if used for business)
  • Personal mobile used proportionally for business: claim business proportion (typically up to 50% defensible without usage log)
  • Handsets purchased outright: claim against AIA (Annual Investment Allowance) or pool depreciation
  • Accessories: cases, chargers, hands-free if business-related — allowable
  • Mileage between client visits: separate from mobile but check claimed
  • Stripe / SumUp / payment processing fees: allowable

For limited companies

  • All of above
  • Company-issued mobiles: allowable expense + benefit-in-kind exemption (employer-provided phones don't trigger BIK if reasonable use)
  • VAT recovery if VAT-registered: 20% recoverable on contracts and handsets

VAT recovery audit

For VAT-registered businesses (sole trader or limited company):

  1. All business mobile invoices in this tax year — collect, ensure VAT-compliant format
  2. Calculate input VAT recovered — should be 20% of net charges
  3. Reconcile with VAT return — check what you've actually claimed matches what you've paid
  4. Personal-use disallowance — if formally accounting for partial personal use, document it

For typical 20-SIM SMB on business mobile: roughly £1,200/year input VAT recovery. Worth checking it's been claimed.

Asset register update

For accounting and audit purposes, your fixed asset register should include business mobile handsets. End of tax year, update:

  • Current allocations (which handset to which staff)
  • Disposals (handsets returned by leavers, scrapped, sold)
  • Acquisitions (new handsets bought)
  • Depreciation if applicable
  • IMEI for each device (for theft/loss procedures)

For VAT-registered businesses with significant handset value, accurate register supports VAT and corporation tax positions.

Contract status check

End of tax year, review:

Contracts coming up for renewal in next 12 months

For each: when does it end, what's it costing, is provider performing? See our renewal checklist.

Auto-renewals to watch

Set calendar reminders 90 days before any auto-renewal. Don't let inertia cost you 20% extra.

Performance against expectations

  • Has coverage been good?
  • Customer service responsive?
  • EU roaming working as expected?
  • Bills accurate?

If significant complaints accumulating, document for renewal-time leverage.

April price increase impact

April 2026 brought the standard £2.50 + VAT/month increase across major UK networks. End-of-tax-year is a good time to:

  1. Confirm increase has hit your bills
  2. Verify it's the contractual amount (not more)
  3. Document for next tax year budgeting
  4. Use as trigger for renewal review

For 20-SIM business at £25/user/month, the April increase adds £600/year. Budget accordingly.

Personal-use policy review

For VAT and tax compliance, having a written mobile use policy strengthens your position:

  • Policy on staff-owned vs company-owned phones
  • Personal-use cap (e.g. "personal use must remain incidental and below 10%")
  • BYOD security requirements (Intune enrolment, PIN, encryption)
  • What happens to work data when staff leave
  • Approval process for international travel and roaming

Update annually as part of tax-year review.

Planning ahead

Headcount changes

If you're hiring or letting staff go in coming year, plan SIM provisioning / cancellation. Lead times for new SIMs (1-2 weeks) and cancellation notice periods (often 30 days) need accommodating.

New initiatives

If you're starting EU/international operations, consider whether current tariff supports inclusive roaming or needs adjusting.

Office moves

If you're relocating, check signal at new postcode for current network. Coverage that worked at old office may not work at new.

Technology refresh

End of tax year is good time to plan handset refresh. Tax-allowable as expense (for sole traders) or capital allowance (for limited companies). Plan refresh cycles to match accounting periods.

Common end-of-year mistakes

Missing a contract end date

Auto-renewing into another expensive year because the calendar reminder was missed. Easy to avoid; common to forget.

Not claiming all eligible expenses

Sole traders particularly often forget mobile-related expenses. Mobile contract, handset purchases, accessories, payment processing fees — all allowable.

Forgetting VAT on roaming charges

Roaming charges on UK business mobiles are subject to UK VAT and recoverable. Often overlooked in VAT calculations.

Inadequate records

For audit purposes, retain VAT invoices for 6 years. Keep digital copies organised by tax year.

What to action now

End-of-tax-year mobile review checklist:

  • Collect all mobile bills for the tax year
  • Reconcile VAT input on mobile expenses
  • Update asset register with current handset allocations
  • Calendar reminders for any contract renewals next 12 months
  • Confirm April annual increase applied correctly
  • Update mobile use policy if needed
  • Review staff allocations for upcoming changes
  • Plan handset refresh / capital expenditure for new tax year

FAQs

Can I claim my UK business mobile against tax?

Yes — 100% allowable as business expense for sole traders (if used for business). For employees with company-issued mobiles, the employer claims expense; staff don't pay benefit-in-kind tax on reasonable phone use. For VAT-registered businesses, 20% input VAT also recoverable.

What's the personal-use threshold for business mobile tax claims?

For business contracts, occasional incidental personal use is accepted by HMRC without disallowance. A written policy stating personal use must remain de minimis (e.g. under 10%) is sufficient evidence. For personal contracts used proportionally for business, claim only the business proportion (typically hard to justify above 50% without usage log).

Should I refresh business handsets at the end of tax year?

If they're due refresh anyway: yes — capital expenditure timing for accounting purposes. If not: don't refresh just for the tax year. Refresh when devices reach 3-4 years old (battery, security, performance).

Does VAT on roaming charges need separate treatment?

No — roaming charges on UK business mobile contracts are subject to UK VAT and recoverable like any other charge. Often overlooked but standard treatment.

Is the April price increase always £2.50?

Currently yes for most UK networks under OFCOM rules requiring fixed-pound increases since 2025. £2.50 + VAT/month is the typical rate; some plans £3.00. Check your specific contract for the exact amount.

Getting help

Call 01743 598025 or request a quote. Free year-end mobile review for any UK business considering optimisation.

Related pages

End-of-year mobile review

Free year-end audit covering tax claims, VAT recovery, contract status, planning for next year. No obligation.

Free year-end review

UK business mobile end-of-year review

Free audit. Tax-claim check. Renewal planning. Honest advice.

Get help