residex.ioEvery trip accounted forThailand’s 180-Day Tax Residency Rule
The threshold is 180, not 183 — and the difference is not academic
Why the number matters
“The 183-day rule” is so widely repeated that it gets applied to countries that do not use it. Thailand is one: the threshold is 180 days in a calendar year, and someone budgeting to 182 in the belief they have a day in hand has already crossed it.
residex.io uses each country’s own threshold rather than a single global number, so Thailand warns at its own line.
The calendar year is the window
Thailand counts within the calendar year, 1 January to 31 December, and the count restarts on 1 January. That makes a stay straddling New Year genuinely two separate counts — which is not true everywhere, and is worth checking country by country rather than assuming.
What residency brings with it
Thai tax residency has consequences beyond the count, and the treatment of foreign income brought into Thailand has changed in recent years. This is exactly the kind of question that day counting raises and does not answer.
What residex.io does about it
Residex tracks your Thai days against 180, warns as you approach it, and can notify you on the date a planned trip would take you across.
Who needs to watch this
- Long-stay visitors and retirees in Thailand
- Remote workers on the digital-nomad circuit
- Anyone wintering in Thailand year after year
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.