Moved from Colorado to Alaska Mid-Year: Which State Tax Returns Do You File?
Answer
Colorado once, and then nothing. Because Alaska does not tax personal income, this move takes you out of the state income tax system entirely. File the Colorado part-year return for the pre-move income and make sure Colorado withholding actually stopped when you left.
Last verified
Moving to a state with no income tax ends your state filing obligation on the day your residency changes — but not a day earlier. Colorado taxes everything you received while you still lived there.
What you file
- 1Part-year return · ColoradoForm DR 0104 with Schedule DR 0104PN
File a Colorado part-year return covering the months you lived in Colorado. Alaska has no wage income tax, so the move ends your state filing obligation.
The two states, side by side
| Colorado | Alaska | |
|---|---|---|
| Taxes wages | Yes — flat | No |
| Reciprocity partners | None | None |
| Convenience rule | No | No |
| Nonresident return | Form DR 0104 with Schedule DR 0104PN | Not applicable |
| Part-year return | Form DR 0104 with Schedule DR 0104PN | Not applicable |
| Credit for other-state tax | Form DR 0104CR | No income tax |
| Nonresident safe harbour | None published | Not applicable |
| Local income tax | Yes | No |
| Revenue department | Colorado Department of Revenue — Taxation Division | Alaska Department of Revenue — Tax Division |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Alaska and working in Colorado gives:One part-year return — the state you moved to.
Same two states, different situation
The withholding answer turns on how you are paid and where the work happens, not only on which two states are involved.
- W-2 commuter: Colorado → AlaskaHome state only
- Remote worker: Colorado → AlaskaHome state only
- 1099 contractor: Colorado → AlaskaHome state only — estimated payments
Other Colorado pairs
Questions people actually ask
I moved from Colorado to Alaska mid-year. Do I have to file in both states?
Colorado once, and then nothing. Because Alaska does not tax personal income, this move takes you out of the state income tax system entirely. File the Colorado part-year return for the pre-move income and make sure Colorado withholding actually stopped when you left.
How do I split my income between Colorado and Alaska?
By when you received it, measured against the date your domicile actually changed. Income received while you were a Colorado resident belongs on the Colorado return and income received afterwards on the Alaska return. Keep evidence of the move date — a lease, a closing statement, a licence issue date.
How current is this?
The Colorado and Alaska rules on this page were last checked against Colorado Department of Revenue — Taxation Division and Alaska Department of Revenue — Tax Division on 2026-08-07. We re-check the full grid every December after state legislative sessions close, and re-check the convenience-of-the-employer states quarterly because that is where the rules move fastest.
Sources
Every fact above comes from the revenue department that publishes the rule. We do not cite secondary summaries, and we do not restate a figure we could not find at source.
- Colorado Department of Revenue — Taxation Division — individual income taxaccessed 2026-08-07
- Alaska Department of Revenue — Tax Division — individual income taxaccessed 2026-08-07