Blog · Tax residency guides
Clear guides on tax residency.
Rules, counted days and proof that holds up — explained without jargon by the team building Daywhere.
Basic guide12 min read
The 183-day rule, properly explained: what counts as a day and what doesn't
Same-day entries and exits, layovers, sporadic absences and the calendar year: the nuances that decide your tax residency — and that almost nobody explains well.
Updated · JUN 2026Read the guide →
Audits
Can the tax authority know how many days I spend in Spain?
Cards, phone, road tolls and municipal records: the sources the Spanish AEAT uses to reconstruct your year.
7 min · JUN 2026
Paperwork
Tax residency certificate: how to get one and what it's for
When you'll be asked for it, where to request it and what to do if two countries claim you at once.
6 min · JUN 2026
Comparisons
Spain vs Portugal: where does a remote worker pay tax in 2026?
Residency rules, rates and the bilateral treaty, with three real cases solved step by step.
9 min · MAY 2026
Proof
What proof holds up in a tax audit (and what doesn't)
Tickets, receipts, geolocation and witnesses: the real weight of each piece of evidence according to the courts.
8 min · MAY 2026
Nomads
Digital nomad: 5 mistakes that make you a tax resident by accident
From the apartment you kept 'just in case' to the gym membership: what gives away a residency you thought you had avoided.
10 min · APR 2026
Double taxation
Double taxation treaties: how to avoid paying twice
What the treaty 'tie-break' is, when it protects you and how to invoke it before the tax authority.
11 min · APR 2026
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