Tax authorities don't accept “I think I spent 186 days in Portugal.”
Hand it to DayProof and forget about it. When it matters, you'll have everything ready.
When tax authorities ask where you spent your days, having it written down isn't enough. Connect your inbox in 3 minutes — DayProof automatically receives your boarding passes, sorts them, alerts you if anything is missing, and generates the report you need in one click.
Built for those who need a tax residency certificate every year — for their bank, their adviser, or the tax authority.
Two years from now, they'll ask.
You'll already have the answer.
Residency audits don't warn you. A letter arrives asking where you spent 2022 — and suddenly you're digging through thousands of emails at 11pm, trying to prove a trip you barely remember. DayProof quietly prevents that moment.
Today, life is moving.
You're flying between cities, clients, apartments. Boarding passes pile up in six inboxes, three phones, a photos app. "I'll organise this later."
The quiet riskThen, the letter arrives.
The tax office — wherever you're filing — wants proof of where you slept in 2022. You have 15 days. Suddenly you're digging through 6,000 emails at 11pm, trying to prove a trip you barely remember. And a sloppy filing — with gaps or missing boarding passes — is the difference between a short audit and one that drags on for months.
The scrambleWith DayProof, it's already done.
One click. A PDF with your days per country, every flight, every boarding pass attached as evidence — dated, defensible, ready for any tax authority. Send it. Go back to your life.
The calmThe problem isn't the days.
It's the proof.
You've been travelling for years. Flying, working, living between countries. You know you meet the non-resident thresholds.
The problem is you can't prove it.
Your boarding passes are buried in years of emails from Ryanair, Iberia, Turkish, Lufthansa. Your travel history lives in your head — not in a dated, signed document. And when a tax authority asks, they don't want an explanation. They want a file.
Tax authorities don't accept "I think I was in Lisbon." They accept dated evidence. Your boarding passes are already that — they just aren't organised.OECD Model Tax Convention · Commentary on Article 4
Three things we do.
Nothing else.
DayProof is narrow by design. It doesn't plan your trips or file your taxes. It does one thing: turn your boarding passes into defensible evidence.
Connect once. Done forever.
Forward your airline emails in 90 seconds — DayProof only receives what you send it, never reads your inbox. Prefer doing it by hand? Upload boarding pass photos, Wallet screenshots, or PDFs and the app reads them all the same.
Your travel year, reconstructed.
We gather your boarding passes, train tickets, ferry receipts and itineraries — classify them, deduplicate them, and build a visual timeline of your year. The dashboard flags gaps and sends a custom email alert when a trip looks missing — so you can fix it the moment it happens, not a year later.
Report, ready when they ask.
Export a clean PDF with your days per country, flight list, and every boarding pass attached as evidence. Ready for your accountant or tax authority.
Three steps, then nothing.
Set it up in under two minutes. Forget it forever.
Connect your email. We handle the rest.
A one-time setup, guided step-by-step in under 90 seconds. DayProof starts receiving every boarding pass, invoice, and itinerary that lands in your inbox — automatically, forever.
- Works with Gmail, Outlook, iCloud, or any email provider
- Screenshots, PDFs and email attachments — upload them directly, or forward them and we'll handle the rest
- Past trips? Connect an older email account and DayProof sweeps through years of itineraries in minutes
- Going back in time is easy. Got a letter asking about 2022? Connect that old inbox and watch it reconstruct years of travel in minutes — no more scrolling through 6,000 emails.
- Privacy by design — we never log into your email. You stay in control and can revoke the connection anytime from your own inbox settings.
Every flight validated and counted.
Our smart parser reads boarding passes, invoices, and itinerary confirmations — pulling out the dates, airports, and routes automatically, using QR recognition and language models.
- Understands multiple document types, from any airline
- Missing a trip? The suggester fills the gaps for you
- Every entry keeps the original document attached as proof
Download a report ready for anyone.
When the moment comes — your accountant, a tax letter, a residency application — one click gives you a PDF with your days per country and every boarding pass attached.
- Days per country, per calendar year
- Full flight list with dates and routes
- Every boarding pass embedded as documentary evidence
| Country | Days |
|---|---|
| Spain | 191 |
| United Kingdom | 84 |
| Portugal | 51 |
| France | 28 |
| United States | 11 |
Every year, your bank, your adviser or the tax authority will ask for a tax residency certificate. And to issue it, most countries require documented proof of physical presence — starting with your flight history.
Your evidence,
defensible by design.
This isn't a nice-to-have. Boarding passes are explicitly accepted as proof of physical presence by tax authorities across the EU, UK and OECD — and DayProof follows the exact rules they use. No improvisation. No "I think I was there."
Transit excluded — OECD art. 15
Airside layovers under 24 hours are correctly excluded from presence counts, following OECD Model Convention guidance.
Documentary evidence, by the book
Every flight comes with its original boarding pass attached as a PDF — the format tax authorities across the EU, UK and OECD list as accepted proof.
Not a tracker — by design
DayProof never watches where you are. It only reads the travel documents you choose to send it. Want automatic GPS confirmation? Our optional Android and iOS companion apps add it — always opt-in, always revocable.
Built like an audit, not an app
Same emails in, same report out — every time. Your timeline is reproducible and dated at source. That's what an inspector wants to see, in any jurisdiction.
Free while we're in beta.
We're building DayProof with the first users. While we're in beta, everything is free, no card.
Everything, free
Unlimited flights, countries, and reports. No catch.
- Unlimited boarding passes, trains, ferries & manual entries
- Connect email or upload your documents directly
- Visual year overview — review your travel at a glance
- Gap detection with custom email alerts — fix missing trips fast
- 183-day threshold alerts per country
- Audit-ready PDF report with every document attached
After the beta
- Today — Free. Everything included, no card.
- Pro — €5/year once you go over 10 trips/year. Everything else stays free.
- For using it during the beta — Pro at €2/year for life.
The things people actually ask.
What counts as proof of physical presence for HMRC?
HMRC and most OECD tax authorities accept boarding passes, flight itineraries, and dated tickets as documentary evidence of physical presence. DayProof automatically collects and organises every document, then exports them as a single dated PDF — the exact format inspectors expect. Learn how tax authorities use boarding passes →
Can I reconstruct past years?
Yes — this is what DayProof was built for. Connect an older email account or upload your archive of past boarding passes, and it'll sweep through years of documents in minutes. Perfect for the moment a tax authority asks about 2022 and you don't want to spend a weekend searching through inbox noise.
Is DayProof valid evidence in a tax audit?
Yes. DayProof generates an audit-ready PDF with your days per country, full flight list, and every boarding pass attached as dated documentary evidence. Tax authorities across the EU, UK and OECD explicitly accept boarding passes as proof of physical presence — DayProof makes sure they're organised and exportable on demand. How to close a tax inspection fast →
Do I have to give you access to my email?
Under no circumstances do we access your email account. You set up an automatic forward in Gmail, Outlook or Apple Mail (we walk you through it step-by-step) that only triggers when an email matches airline or travel-agency keywords — boarding pass, flight confirmation, your itinerary and similar. We receive exclusively those forwarded emails, nothing else. Your documents are stored encrypted with AES-256 at rest and in transit (HTTPS). You can stop the forward at any time from your email client settings, without going through DayProof.
Do layovers and transit stops count toward the 183-day rule?
No — airside transits and short layovers are not counted as days of physical presence under the 183-day rule or the OECD Model Convention. DayProof automatically detects connecting flights and excludes them from your day count per country.
How does the 183-day rule work?
The 183-day rule is the most common tax residency threshold: spending more than 183 days in a country in a calendar year typically makes you tax-resident there. Most jurisdictions — including HMRC's Statutory Residence Test, Spain's AEAT, and the OECD Model Convention — use variants of this rule. DayProof counts your days per country automatically and alerts you as you approach each threshold. Read the full 183-day rule guide →
Will this stay free?
During public beta, yes. Eventually there will be a paid tier for power users, but the core — email connection, parsing, counting, and exporting one report per year — will remain free for individuals.
What about GDPR and my data?
Your data is encrypted in transit (HTTPS) and at rest (AES-256 via Active Record Encryption), never sold, never shared. You can export everything or delete your account with a single click. We are GDPR compliant by design and the data lives on EU servers.
What is the UK Statutory Residence Test (SRT)?
The UK Statutory Residence Test is HMRC's official framework for determining whether you are tax-resident in the UK in a given year. It combines automatic overseas tests, automatic UK residence tests (triggered at 183+ days), and sufficient ties tests based on your home, work and family in the UK. DayProof tracks your UK day count throughout the year so you always know which test applies. Read the full guide →
Don't wait until they ask.
Set up a forward rule in two minutes. DayProof takes care of the rest — quietly, indefinitely.