The tax authorities that demand boarding passes (named and shamed)

“I do go to Lisbon a lot, but I’m pretty sure I spend most of the time in Spain.”

Your word isn’t proof. And tax authorities don’t take it.

Here’s what they actually demand.

Spain — Agencia Tributaria

When you apply for a tax-residency certificate (form 30 → 03) or respond to an audit, the Spanish tax office can request:

• Full passport with every visible stamp
• Boarding passes or train/ferry tickets for international trips
• Hotel receipts outside Spain
• Bank statements that geo-locate you (card purchases)
• Lease contracts in other countries
• Utility bills for foreign addresses

In practice: boarding passes are what tip the scales. The rest proves “availability”; the boarding pass proves physical presence.

Portugal — Autoridade Tributária

To certify Portuguese tax residency (Form 21 RFI), typical requests:

• Boarding passes (tarjetas)
• Stay receipts: hotels, rentals, invoices
• Active NIF in Portugal and associated movements
• Family ties (children enrolled in Portuguese schools, for example)

If you claim the IFICI regime (NHR’s successor), they audit your physical-presence days surgically across the 10 years of the regime.

Cyprus — Tax Department

If you’re claiming the 60-day rule (the fast track to non-dom status), the Cyprus Tax Department demands:

• Boarding passes for every entry and exit flight
• Passport stamps (third-country entries/exits)
• Employment contract or self-employed registration in Cyprus
• Domicile receipt (rented or owned) in Cyprus
• Certificate of non-residency elsewhere

Without the boarding passes, they don’t issue the residency certificate. With them: two weeks.

United Kingdom — HMRC

The British Statutory Residence Test (SRT) is famously document-hungry. HMRC routinely asks for:

• A literal travel diary
• Boarding passes
• Passport stamps
• Bills and movements for each residence
• Work calendar (when you worked from where)

HMRC’s official guide RDR3 explicitly recommends “retain copies of boarding passes and travel records”. It’s the closest a tax authority has come to saying “use a boarding pass app”.

OECD — Model Tax Convention

When two countries claim you as a resident, the OECD tie-breaker (Art. 4) kicks in. Boarding passes are the evidentiary foundation for the “habitual abode” criterion (step 3).

Without proof of presence, the case gets decided on nationality — almost never the optimal outcome.

The pattern

Five independent tax authorities — Spain, Portugal, Cyprus, UK, OECD — and they all want the same thing: dated boarding passes.

Not by accident. Boarding passes meet three criteria that hotel invoices or bank statements don’t always meet:

1. Independent issuer (the airline, not you).
2. Verifiable date against the flight manifest.
3. Geo-location (origin and destination IATA).

The operational problem

You have 5-10 years of flights. Spread across:

• 6 different email accounts (some shut down)
• Airline apps that changed names
• PDFs in Drive, photos on the phone
• Confirmations that mix marketing flights with real flights

When the request lands, you have 15 working days.

DayProof connects your inboxes, captures the boarding passes as they arrive, sorts them by year and country, and warns you if a trip looks missing. When you need to prove where you were on March 14, 2023, the archive is already done.

Free during beta.