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Timeline for 2015 Individual Statistics of Income compilation:
Statistics of Income Processing Activity
2015 federal and Colorado individual income tax returns are filed by most taxpayers.
2015 returns are filed by most of the remaining individual taxpayers who filed for extensions.
IRS extracts 2015 federal individual income tax return data. This extract contains on time, extension, late, amended, and corrected 2015 individual income tax return data.
September - November 2017
IRS sends the extract of 2015 individual federal income tax return information to the states.
Department staff begin matching and compiling federal and Colorado individual income tax filing data after legislative session closes.
2015 Individual Statistics of Income is completed and published by DOR.
Additionally, the SOI reports are also included in the biennial Colorado Tax Profile & Expenditure Report, as required by §39-21-303, C.R.S.
Region 1. Logan, Morgan, Phillips, Sedgwick, Washington, and Yuma counties
Region 2. Larimer and Weld counties
Region 3. Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver, Douglas, Gilpin, and Jefferson counties
Region 4. El Paso, Park, and Teller counties
Region 5. Cheyenne, Elbert, Kit Carson, and Lincoln counties
Region 6. Baca, Bent, Crowley, Kiowa, Otero, and Prowers counties
Region 7. Pueblo county
Region 8. Alamosa, Conejos, Costilla, Mineral, Rio Grande, and Saguache counties
Region 9. Archuleta, Dolores, La Plata, Montezuma, and San Juan counties
Region 10. Delta, Gunnison, Hinsdale, Montrose, Ouray, and San Miguel counties
Region 11. Garfield, Mesa, Moffat, Rio Blanco, and Routt counties
Region 12. Eagle, Grand, Jackson, Pitkin, and Summit counties
Region 13. Chaffee, Custer, Fremont, and Lake counties
Region 14. Huerfano and Las Animas counties
Table 19 Supplement. Colorado Income and Tax Data by Size of Colorado Taxable Income in $10,000 Increments
This supplemental table to the Individual SOI summarizes all of the returns that were included in SOI and all Colorado income tax returns that were excluded from the SOI data set– either because the returns were not full-year residents or because they did not match up to an IRS return in the data merging process. This information is provided to help the data users apply their own weighting methodologies if needed.