Is your mobile phone bill deductible in the UK and Spain?
Business proportion allowable
HMRC accepts a reasonable business share of a mixed-use phone contract. If roughly 60% of your usage is business, claiming 60% of the bill is a defensible position — keep a note of how you arrived at the number.
Hacienda expects a dedicated business line
Spain is stricter: inspectors routinely reject a personal line claimed at a percentage. The clean route is a line used exclusively for the activity — a second SIM or contract in your name. That bill, with a proper factura, is then fully deductible.
If you file in both countries
A classic UK-Spain divergence: the proportional claim that is fine for HMRC is exactly what Hacienda likes to strike out. If you file in both systems, a dedicated work SIM pays for itself in removed arguments.
Evidence to keep
- ✓Monthly facturas from the operator with your NIF (operators generate these on request)
- ✓For a UK proportional claim: a short note of the estimated business share
- ✓Payment by direct debit from an account you can show
Frequently asked questions
Is a dual-SIM phone enough for Spain?
The exclusivity attaches to the line, not the handset. A dual-SIM phone with a dedicated business number is the common practical setup.
Can I deduct the handset itself?
The handset follows the same logic as a laptop: business share in the UK; in Spain it is much easier to defend if the phone is genuinely for the activity.
Forensix provides software for organizing tax records and producing estimates. We are not registered tax advisors; rules change and individual circumstances differ. Treat this page as general information and confirm your own case with a gestor or accountant before filing.