What is a "sales study period?"

According to State statute, the assessor is required to gather and confirm sales within an 18-month period ending on the June 30 of the year prior to a reappraisal year. This data-gathering period is referred to as the sales study period. While statute prescribes an 18-month study period, assessors are allowed to extend the study period back in time in six-month increments up to 60 months to ensure enough qualified sales within each economic area. When sales volume is high, fewer years can be used. When sales volume is low, more years may be necessary to obtain adequate comparable valuation data.

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1. Who sets the tax rate or mill levy?
2. I thought the “Taxpayer Bill of Rights (TABOR) Amendment” said that taxes could not go up, yet my valuation has increased. How can that be?
3. Why is vacant land and commercial assessed at 27.9%, and residential at 6.765%?
4. How do I calculate property taxes?
5. My Notice of Valuation shows land value and improvement value, but I didn’t make any improvements. How can my assessment or value change when I haven't done anything to my property?
6. How can I determine if the appraisal of my home is accurate?
7. If I disagree with the Assessor’s valuation of my property, what should I do?
8. What happens after I appeal?
9. If I bought my house within the last two years, shouldn’t the value be the same as what I paid for it?
10. My property doesn't compare to the expensive home down the street that just sold. Are you valuing my property based on that property?
11. If my property value has increased, will my property taxes go up?
12. What does my County Assessor do?
13. Why is property taxed in Colorado?
14. Do all assessments or values change at the same rate?
15. What are the factors used in determining value?
16. What is a "sales study period?"
17. What is time trending and why is it necessary?
18. Who makes the rules on property assessment?
19. News media stories have indicated that nearly all taxpayers who contest their assessment get a substantial reduction in value that significantly reduces their tax. Is that true?
20. I think you have the correct value on my property, but I feel my taxes are too high. What can you do about that?
21. The farmer/rancher next door to me has a much lower value on his land than I do on my residential lot. Why?
22. What records contained in the Assessor’s office are public?