residex.ioEvery trip accounted forPortugal’s 183-Day Rule Over Any 12 Months
A rolling window — so splitting a stay across New Year changes nothing
The New Year trap
If a country counts by calendar year, a stay that straddles 31 December is split into two counts and each may look harmless. Portugal does not count that way. It looks at any twelve consecutive months, so the split does nothing.
Five months from August to December, then another month in January, is 185 days inside a single twelve-month window. Looked at by calendar year it is 153 days and 32 days — neither remotely close to a threshold. Looked at the way the rule actually works, it is over the line.
Portugal is not alone in this. Indonesia and the UAE also use a rolling twelve months, which is why residex.io applies a rolling window to each of them rather than a calendar year.
Presence is not the only route
Day count is one way to become resident in Portugal, not the only one. Habitual residence — maintaining a home there in a way that suggests you intend to keep it — can establish residency on its own, independently of any threshold.
What residex.io does about it
Residex slides a twelve-month window across your Portuguese days and reports the highest total it reaches, so a stay split across New Year shows up as the single stretch it really is.
Who needs to watch this
- Anyone wintering in Portugal
- Remote workers on Portuguese visas
- Property owners spending long stretches in the Algarve
- Anyone who assumed 1 January resets the count
Counting days is where this stops
Residex tells you exactly where you stand against this threshold and warns you before you cross it. Crossing it is not a conclusion, though: it does not tell you what you owe, whether a treaty offers relief, which forms to file, or how this interacts with residency you already hold elsewhere.
That is where Amanda picks up — turning a day count into a read on your real cross-border obligations.
Track it automatically
Free forever. No account required. Your data never leaves your device.
How residex.io works
residex.io tracks where you have physically been, and tells you where that puts you against each country's own residency threshold.
What it does: • Counts your days per country, and per area for the Schengen 90/180 rule • Applies each country's actual rule — 183 days for most, 180 for Thailand, the UK's 6 April tax year, Portugal's rolling twelve months, and the US weighted three-year test • Counts days the way each rule counts them, including the arrival and departure days that most tests count and a nights-based tally misses • Warns as you approach a threshold, and can notify you on the date a trip you have already planned would take you across it • Exports to CSV, or hands off to Amanda for the compliance picture
Built for digital nomads, frequent travellers, expats, and anyone whose year is split across borders.
On your device, and nowhere else. There is no account, no login, and no copy of your travel history on our servers — residex works offline because the data never needed to be anywhere else.
It leaves your device only when you decide to send it: • A backup file you save yourself • A transfer to another device, encrypted with a code only you hold — the server relaying it cannot read what it is carrying • A hand-off to Amanda, which you start
We do receive a small amount of anonymous usage information — how many trips are in a log, how old an install is, the language the app is used in, and a random identifier that is not linked to you. Never a trip, a date, a destination, or your name. It is listed in full in our Privacy Policy.
The trade-off worth knowing: because your device holds the only copy, clearing your browser data or deleting the app erases it, and we cannot restore it. Save a backup before you switch devices.
No — residex is a day counter, not a compliance engine. It flags when you cross a threshold like the 183-day rule, but turning that into specific filings, tax exposure, or reporting obligations depends on your jurisdictions and personal ties.
For that, our partner Amanda maps your full cross-border legal exposure across countries, surfaces the filings and deadlines you trigger, and turns the data residex collects into a concrete compliance picture you can hand to your accountant.
You can export your residex trips and import them straight into Amanda — the CSV formats are aligned.