Comparison

Tax Days vs. Domicile365: feature, price, and privacy comparison

Domicile365 is a long-running residency-tracking service for snowbirds and cross-border workers. Tax Days is the iPhone-native alternative. Here's how they compare.

7 min read

Domicile365 has been a staple in the residency-tracking category for years, especially among accountants serving snowbirds. Tax Days takes the same problem and brings it to the iPhone with privacy as a first-class concern. Here's a candid comparison.

Pricing

Tax DaysDomicile365
Annual cost$19.99/yearVaries by plan, typically $50–250/year
Free tierYesTrial only

Tracking method

  • Domicile365: uses background GPS to auto-track location.
  • Tax Days: automatic background tracking on Pro, or manual entry, your choice. Significant-change monitoring rather than a fixed interval, with trips proposed for you to confirm.

Both apps can count your days automatically. The difference is granularity and custody: Domicile365 samples roughly every 15 minutes and stores that trail on its servers, which is what makes its cryptographic verification and advisor portal possible. Tax Days samples on significant change, which costs less battery and produces a coarser record, and keeps it on your iPhone. Manual entry stays available at about 5 seconds per trip if you'd rather grant no location access.

Rule coverage

Tax DaysDomicile365
US states (50)All 50, with state-specific abode rulesAll 50
Federal SPTYes (3-year weighted)Yes
Schengen 90/180YesLimited
UK SRTYesLimited
International30+ countriesUS-focused

Privacy

  • Tax Days: SwiftData on-device storage. Optional iCloud via Apple CloudKit. We have no servers and no access.
  • Domicile365: data stored on Domicile365's servers; account-based with email login.

Platforms

  • Tax Days: iPhone (iOS 26+) and Mac via Catalyst.
  • Domicile365: iOS, Android, web.

Audit support and reporting

  • Tax Days: exports per-jurisdiction PDF with day count, trips, and rule evaluations.
  • Domicile365: reports and CSV exports; some plans include accountant access.

Who each is for

Domicile365 is best for: people who need cryptographic verification of the location record, multi-platform access, and an accountant-shareable account-based service.

Tax Days is best for: iPhone users who want privacy by design, want to track international rules alongside US states, and want to pay $20/year instead of $200.

FAQ

Frequently asked questions

Is Tax Days cheaper than Domicile365?

Generally yes. Tax Days costs $19.99 per year and includes a free tier, while Domicile365 pricing varies by plan and typically runs $50 to 250 per year, with a trial rather than an ongoing free tier.

Does Domicile365 track your location with GPS?

Yes, Domicile365 records your location in roughly 15-minute increments using background GPS, stored on its servers against your account. Tax Days also offers automatic tracking on Pro, but it samples on significant change rather than a fixed interval, proposes trips for you to confirm, and keeps the history on your iPhone. You can also turn location off entirely and log trips manually in about 5 seconds each.

Which covers more international rules, Tax Days or Domicile365?

Both cover all 50 US states and the federal Substantial Presence Test. Tax Days also covers the Schengen 90/180 rule, the UK Statutory Residence Test, and rules for 30+ countries, whereas Domicile365's coverage of those international rules is more limited and US-focused.

What platforms do Tax Days and Domicile365 run on?

Tax Days runs on iPhone (iOS 26 and later) and on Mac via Catalyst. Domicile365 is available on iOS, Android, and the web, so it may suit people who need Android or browser access.

Who is Domicile365 better for than Tax Days?

Domicile365 is generally the better fit for people who need a cryptographically verified location record, multi-platform access, and an account-based service that an accountant can access on some plans. Tax Days suits iPhone users who want the same automation without a vendor holding the trail, international rules alongside US states, and a roughly $20 per year price instead of $220.

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