Is there one day-count rule for every tax treaty?
No, and treating it as a single rule is the common error. Each treaty's employment article sets its own measuring period and its own window: some count within a calendar year, others within any twelve-month period, which can pick up two halves of two different years. Some count physical presence, others days of work. Until you have read the article that applies to the pair of countries in question, you do not know what is being counted or over what stretch of time, and a count made on the wrong basis proves nothing.
Do weekends and travel days count towards the day test?
Where the test measures physical presence, generally yes: the question is whether the person was in the country, not whether they worked. Part-days usually count as whole days, so an arrival afternoon and a departure morning are commonly two days rather than one. That treatment is why counts built from workdays tend to come out lower than an authority's own count, and why weekends spent in the host country matter. Read the article to see which basis applies before counting, because the difference between the two bases decides borderline cases.
We are under the day limit — why is host tax still due?
Because the day condition is one of several that have to be satisfied together. The employment article generally also asks who the employer is and who bears the cost of the employee's pay. An employee comfortably inside the day count whose remuneration is borne by the host entity can lose the exemption on that ground alone. Passing the day test is necessary and not sufficient, so a position built on the count by itself is incomplete, and it is usually the cost-bearing condition rather than the count that an examination finds wanting.
Which twelve-month period does the treaty measure the days over?
Where the article uses any twelve-month period rather than a fixed year, it means exactly that: any rolling stretch of twelve months beginning or ending in the tax year concerned. The consequence is that days late in one year and days early in the next can be added together into a single period, so an employee who looks comfortable when each calendar year is taken separately can breach the test across the boundary. Counting by tax year against an article drafted on a rolling basis is one way a position quietly fails.
How do we prove an employee's day count to the tax authority?
With dated independent records, not a spreadsheet compiled afterwards. Entry and exit evidence, travel bookings, expense claims and calendar entries can be reconciled against each other, and where they disagree the disagreement is better identified by the employer than by an examiner. Build the count on the basis the article uses, keep the underlying documents with it, and record the treatment applied to arrival and departure days so the method is visible. An authority that can follow the method usually argues about the conclusion; one that cannot argues about everything.
Does the day count restart when the employee changes host country?
The count is made country by country, under the treaty between the home country and that particular host, so presence in one host does not consume the allowance in another. What does not restart is the underlying exposure: one trip can be relevant to more than one country's rules, and a person moving between two hosts may need two counts on two different bases over two different windows. Keep one presence record covering everywhere the person was, and derive each country's count from it rather than the reverse.
What is the US exit tax?
A charge that applies when a US citizen renounces or a long-term permanent resident gives up their status and meets one of the covered-expatriate tests — an income test, a net-worth test, or a failure to certify five years of compliance. A covered expatriate is treated as having sold worldwide assets on the day before expatriation, and Form 8854 is what reports the position. The tests turn on figures that are indexed, so they are read for the year of expatriation. See Form 8854.
What is RNOR status?
Resident but not ordinarily resident — a transitional category in India between non-residence and full residence, reached on the day counts after returning from a period abroad. While it lasts, certain foreign income stays outside the Indian tax base, which makes the timing of a return to India worth planning rather than leaving to chance. It is temporary, and the window is set by the day-count rules. See RNOR status.
