How is tax split if I change country in the middle of the year?

The calculator uses your move date, salary, and both countries, then prorates liability where the dataset supports split-year treatment. A full-year comparison is the wrong model for a July move.

What changes if I move in March versus October?

More of the year's income falls in the country where you spend more of the year. Enter the actual date — March and October produce different splits on the same salary.

Can I model a split year before I accept a relocation package?

Yes. The output is a planning number for the contract conversation, not a filed return. Treaty relief can change the result.

Premium feature

Mid-Year Move Calculator

Split-year liability when you relocate mid-tax-year

The Mid-Year Move Calculator estimates split-year income tax when you change country of work or residence partway through a calendar year, prorating liability across home and host rules.

TL;DR — Key Takeaways

Last reviewed: April 1, 2026

→You specify move date, salary, and countries; the model applies time-apportioned rates where our dataset supports split-year treatment. Critical for July relocations when full-year comparisons mislead.
→Treaty relief and dual-status years may need professional review beyond the model.

Sources: OECD Tax Database, national tax authorities, and our methodology. For filing decisions, consult a licensed tax professional.

How it works

Open the mid-year move calculator in your Premium dashboard.
Enter the date you change country of work or residence.
Enter your annual salary and the home and host countries.
Review how income is split before the move and after it.
Use the figure before you sign a contract. Treaty relief and dual-status years may still need a professional review.

Who it's for

Employees with a firm relocation date who need a planning number before signing a contract.

Common questions

How is tax split if I change country in the middle of the year?: The calculator uses your move date, salary, and both countries, then prorates liability where the dataset supports split-year treatment. A full-year comparison is the wrong model for a July move.
What changes if I move in March versus October?: More of the year's income falls in the country where you spend more of the year. Enter the actual date — March and October produce different splits on the same salary.
Can I model a split year before I accept a relocation package?: Yes. The output is a planning number for the contract conversation, not a filed return. Treaty relief can change the result.

Premium features run in your private dashboard after sign-in. Public pages describe capabilities only—your trip logs and documents are never crawled. Planning tool, not tax advice.