Authors
The people behind Tax Days' tax-residency guides, and how the rules are researched from primary sources. Below is who writes them and the guides each author has published, from state residency tests to country 183-day rules and Schengen 90/180. See our editorial policy for how guides are sourced and updated.
Ian MacCallum
Founder · Parra
Founder of Tax Days. Researches residency-day rules directly from primary sources, IRS publications, state tax departments, HMRC, statutes, and tax treaties.
144 guides, most recent
- Which states audit residency the hardest? A state-by-state ranking
- North Carolina residency: 183 days, abode, and the Charlotte / Raleigh playbook
- Georgia residency: 183 days, domicile, and the Atlanta tax migration
- Michigan residency: domicile, 183 days, and the abode test
- Ohio residency: bright-line test, contact periods, and the 213-day rule
- Maryland statutory residency: 183 days, abode, and the 'Snowbird Tax'