Thetis - Day-Count Tracking Across Tax Jurisdictions

Tax residency tracking for borderless individuals - simplified.

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Updated Jul 2026 · Added Jul 2026

thetistax.com

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What is Thetis?

Thetis is a tax residency tracking platform for globally mobile individuals. It integrates with your calendar to monitor day-counts and residency thresholds across multiple jurisdictions, providing live status updates (Safe, Approaching, Over) and automatically filing your federal, state, and treaty-based tax returns in each country where you have a tax claim. Built by a team of chartered accountants and tax experts, Thetis simplifies compliance for people who travel and work across borders.

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Key Features of Thetis

Calendar integration for automatic flight and border tracking
Live status tracking across multiple jurisdictions
Day-count and residency threshold monitoring
Automated tax return filing in all applicable countries
Quarterly advisory calls with chartered accountants
Treaty-based return optimization
Multi-jurisdictional compliance management

Who Should Use Thetis?

Track tax residency for digital nomads and frequent travelers

Manage day-count limits across multiple countries

Optimize tax filing strategies for globally mobile professionals

Ensure compliance with statutory residence tests across jurisdictions

File federal, state, and treaty-based returns automatically

Thetis: Pros & Cons

✓Pros

Expert-backed filing with named chartered accountants in each jurisdiction
Automated calendar integration eliminates manual day-counting
Live status alerts prevent accidental residency threshold breaches
Covers federal, state, and treaty-based filings in all supported countries
Quarterly calls with responsible advisor for personalized guidance
Simplifies complex multi-jurisdictional tax obligations

Frequently Asked Questions about Thetis

How does Thetis know when I cross a border or take a flight?

Thetis integrates with your calendar to automatically track border crossings and flights you've added there, monitoring your day-count against residency thresholds in real time. You need to add these events to your calendar yourself; Thetis reads them from there and updates your residency status across all the jurisdictions where you have a tax claim.

Does Thetis file my taxes in every country where I'm tax resident, or just my home country?

Thetis files federal, state, and treaty-based tax returns in each country where you have a tax claim, not just your home country. The filing is handled by chartered accountants in each jurisdiction as part of the membership, though Thetis does not specify pricing for the filing service on its homepage.

What does a 'Safe', 'Approaching', or 'Over' status mean in Thetis?

These are live status alerts for your residency position in each jurisdiction. Safe means you are within the day-count limit for that country's residency test; Approaching means you are nearing the threshold and risk crossing into tax residency; Over means you have exceeded the limit and triggered a tax obligation there.

Can I use Thetis for free, or do I need to pay for the tax filing service?

Thetis offers a free tier that includes calendar integration and residency tracking. The automated tax return filing across multiple countries requires a paid membership, but the membership pricing is not disclosed on the homepage; you will need to contact them directly to find out the cost.