TL;DR — Key Takeaways
- →Set a home-country baseline and a salary.
- →Weight the year by days logged in each place.
- →A cheap month is not the same as tax saved versus home.
- →The running total is a planning figure, not a filed return.
Short answer
Year-to-date savings are the difference between estimated tax where you have been and estimated tax if you had stayed home, weighted by days. Cost of living is a separate question.
Domicyle Premium Tax Savings Ledger uses the same 2026 bracket models as the calculator and your trip log for the weights. Update the log when you add a trip so the year-to-date number moves with you. It does not replace a preparer's computation.
Educational planning only — not tax advice.