Question 1

What is the Substantial Presence Test?

Accepted Answer

Under IRC §7701(b), the U.S. Substantial Presence Test generally applies to noncitizens who are not green-card holders: you typically need at least 31 days in the current calendar year and a three-year weighted-day total (current year full days, prior year one-third, two years prior one-sixth) of 183 or more. Exempt-day categories, treaties, closer-connection elections, and the green-card test can alter results. Interpretation is typically fact-specific; consult a qualified tax professional.

Question 2

What is the UK Statutory Residence Test?

Accepted Answer

HMRC’s Statutory Residence Test typically follows a sequence: automatic UK residence tests, automatic overseas tests, then—when needed—a sufficient ties test weighing UK midnights against ties such as work, accommodation, or family components. Spending 183+ UK midnights in the tax year is often an automatic residence limb alongside other limbs. Exceptions and tie weighting vary. This calculator does not automate every limb; outcomes are typically fact-specific—consult a qualified tax professional.

Question 3

How does the 183-day rule work?

Accepted Answer

“183 days” usually describes a common half-year shorthand for residency, but thresholds and counting methods vary by jurisdiction—midnights, calendar days, and partial-day conventions differ widely. In practice, both the US Substantial Presence Test (a weighted three-year day count) and the UK Statutory Residence Test (typically UK midnights counted against SRT limbs) partly echo that idea yet add different mechanics. Residence can arise below 183 days in many systems. Guidance is informational; consult a qualified tax professional.

Question 4

Am I a tax resident if I spend 183 days in a country?

Accepted Answer

Not necessarily. In many jurisdictions, spending roughly 183 days strongly suggests resident status yet ties, habitual abode, domicile, or overseas tests—especially under the UK SRT—often produce residence sooner or defer it. Conversely, treaties, exempt-day sets, elections, or split-year rules sometimes change headline outcomes. Presence alone rarely answers every question. Use this tool as educational; your facts are generally unique—consult a qualified tax professional.

Substantial Presence Test & UK Statutory Residence Test Calculator