Tax residency

California — nine-month presumption calculator

California presumes residence after more than nine months, but residence generally depends on temporary/transitory purpose and the full facts. A fixed-day proxy is not an exact conversion of nine calendar months.

Your dates, made clearer

Calculate your days

Calculated in your browser. Your trip dates stay in this tab.

Loading the calculator. If the fields stay unavailable, enable JavaScript and reload this page.

Your recorded visits

Add visits to this region. Overlapping dates count once.

How this count works

Counts recorded dates in California during the calendar year, including part days. US days recorded without a state are not counted.

More than nine months in California creates a residence presumption that can be challenged. A fixed number of days is only an approximate reminder for nine calendar months. Residence can arise with fewer days based on the other applicable rules.

Read the complete rule explanation →