1. Regular filing should mean a nonresident Colorado return. Which is correct. CO collects tax based on the income earned in CO.
2. Colorado does not consider retirement income from CO as a CO source of income so you will not need to file a tax return in future years. For the transition year, you will file CO for just the wages earned. See CO source income.
3. You are always welcome to have an expert review the years but I don't know what you actually did - how you filed. If you filed nonresident CO returns, you should be fine.
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