Untild
Tax residency
Understand the day-count component of country, state and city tax rules.
Explore the rulesThe Untild rulebookKnow your days.
Know your days.
Plan your next stay.
A little clarity for life between places. Explore the rules, check your recorded dates, and find the official source behind each count.
Free browser tools · No account needed · Official sources linked
Find your starting point
View all rules One place. A clearer picture.
Visa days
Schengen 90/180-day rule
29 countries • 90 days within any 180-day period
Schengen AreaRead the rule
Tax residency
US tax — substantial presence
183 weighted days over 3 years · at least 31 this year
United StatesRead the rule
Tax residency
New York — statutory residence
Home there + more than 183 days
New YorkRead the rule
Tax residency
Portugal tax — physical presence
More than 183 days in any relevant 12 months
PortugalRead the rule
Residency
Canada permanent residence — days present
730 days • last 5 years
CanadaRead the rule
Tax residency
UK tax residence — personal day limit
Personal day limit · 6 April–5 April · other tests apply
United KingdomRead the rule
Different plans, different rules
What are you keeping track of?
Visa days
Count recorded visits and see how a stay window works.
Explore the rules
Residence & citizenship
Keep an eye on physical presence, absences and return dates.
Explore the rulesLet your days follow you.
Bring your travel history, day counters and future plans together in Untild for iPhone.