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State rules

Colorado residency day rule.

If you keep a permanent home in Colorado and are in the state for more than six months of the year in total, you're treated as a resident.

Summary as of October 2026 · Not tax advice

Day linemore than 6 months + home
Type of testMonths test (days approximate)
Home in the state requiredYes
LawC.R.S. § 39-22-103
Official sourcetax.colorado.gov

What it means

This test is written in months, so a day count is only an approximation. We flag you as close well before the line.

Keep the record

Whatever the rule, the person claiming not to be a resident usually has to prove it. Log every day, including travel days, and keep the receipts, boarding passes and photos that back it up. What auditors ask for.

States with the same kind of test

Questions

How many days can I spend in Colorado without becoming a resident?

If you keep a permanent home in Colorado and are in the state for more than six months of the year in total, you're treated as a resident. Days alone aren't the whole story: domicile is a separate test.

Does a partial day in Colorado count?

Most states with a day test count any part of a day in the state. Check the state's guidance for its exceptions.

Count your days

Free and private. Your log stays on your device.