For accountants and tax advisers
Your client's day count, with the evidence attached.
Residay is a day-tracking app your clients run themselves, on their own device, that applies the correct counting convention per jurisdiction and produces a dated report you can work from. You get a defensible ledger instead of a spreadsheet built from memory in April.
Where the exposure actually sits
Day-count exposure is rarely discovered early. It surfaces when a client's travel pattern has already fixed the outcome, and the argument that follows is about evidence rather than law.
- The US Substantial Presence Test reaches back three years with a weighted formula, so a client can trip it in a year that felt light. How the weighting works.
- New York statutory residency is the most aggressively audited residency test in the United States, and it turns on any-part-of-a-day counting plus a permanent place of abode. What the audits look for.
- The UK Statutory Residence Test combines a midnight-based count with ties and a deeming rule that catches frequent same-day visitors. The ordered tests.
- Schengen 90/180 is a rolling window, not an annual allowance, and the Entry/Exit System now computes it from an authoritative database. Why the window never resets.
Beyond those, the knowledgebase covers 32 jurisdictions in total — including India, the UAE, Australia, Canada, Norway, New Zealand and the no-income-tax destinations your clients relocate to. Every rule carries its source and the date it was last verified, and the coverage table lists all of them.
The workflow
1 — The client tracks
Days are recorded automatically on the client's device, with each attribution carrying its evidence. Nothing is transmitted: there is no account and no server.
2 — The app asks what it cannot see
Abode, domicile, employment and home tests are captured as dated attestations through short jurisdiction interviews, each question paired with why it is asked.
3 — You receive a report
A branded PDF per jurisdiction and period: counts, the convention applied, the day table, attestations on record, unknown-day exposure, the generation date, and the rules version it was computed against.
Why the report is defensible
The report states not just the count but how it was reached: which convention applied, which days were excluded and why, which facts the client attested to and when, and how many days in the period have no evidence behind them. Unknown days are shown rather than silently treated as absent — an honest gap is easier to defend than a confident number that cannot be sourced.
Every threshold in the app comes from a versioned rule file carrying the authority's own source link and a last-verified date, and the report names the rules version used. If a rule changed mid-period, the evaluation uses the wording that applied at the time. You can read the methodology or inspect the rule data directly before recommending it to anyone.
Triage tools you can use today
The calculators are free, need no account, and run entirely in the browser — usable in a client meeting without anything leaving the room. They run the same engine as the app.
Talking to us
For multi-client use, rule coverage requests, or a walkthrough of the report format, write to hello@residay.com. If a rule is wrong or out of date, tell us — every rule carries its source, so a correction is a short conversation rather than an argument.
Residay does not provide tax or legal advice and is not a substitute for professional judgement. It reports rule conditions and the evidence behind them.
Questions advisors ask
How can accountants track residency days for their clients?
The practical pattern is to have the client record days themselves, continuously, in a tool that applies the correct counting convention per jurisdiction and retains evidence — then hand you a report at year end. Residay is built for that handoff: the client tracks on their own device, and exports a dated report showing counts, the convention applied, the day table, attestations on record and unknown-day exposure.
What is the best way for a client to evidence their day count in an audit?
A contemporaneous record beats a reconstruction every time. Revenue authorities that run residency audits — New York most aggressively — will subpoena mobile phone records, toll transponder logs and card statements to rebuild a year. A ledger built day by day, with a stated source for each attribution, is materially stronger than a spreadsheet assembled in April from memory.
Does the client's location data reach Residay or the advisor's firm?
No. The app has no account and no server; the data stays on the client's device and its App Store privacy label reads Data Not Collected. What reaches you is only what the client chooses to export and send you.
Which residency tests does Residay evaluate?
51 researched rules across 32 jurisdictions, each versioned against the responsible authority's own guidance. The ones your clients meet most often are the UK Statutory Residence Test including ties and the deeming rule, the US Substantial Presence Test with its three-year weighting, New York and the other bright-line states, the Schengen 90/180 rolling window, Indian residential status including RNOR, and the FEIE physical presence test. Where residence turns on facts and circumstances rather than a day threshold — Austria, France, Germany, Hong Kong SAR China, Israel, Japan, Netherlands, Puerto Rico, and Switzerland — counts are presented as advisory only, and 14 rules in total carry that status. The full list, with sources and verification dates, is at /guides/coverage/.
Can we see how the rules are maintained before recommending it?
Yes, and we would rather you checked. Every rule is versioned with effective dates, carries the authority's own source link and a last-verified date, and is pinned by golden test vectors. The methodology is published, and so is the rule data itself as JSON.