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, time-adjusting each sale to the June 30 ending date.

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. What does my county assessor do?
2. Why is property taxed in Colorado?
3. How is my property value determined?
4. Do all assessments or values change at the same rate?
5. How can my assessment or value change when I haven't done anything to my property?
6. What are the factors used in determining value?
7. What is a "sales study period?"
8. Why is the sales price adjusted for some sales?
9. What is time trending and why is it necessary?
10. What is an "arm's length transaction"?
11. If my property value has increased, will my property taxes go up?
12. How do I estimate taxes on a new house?
13. How do I estimate taxes on vacant land?
14. Why is vacant land and commercial assessed at 29%, and residential at 7.96%?
15. Who sets the tax rate or mill levy?
16. How does the TABOR Amendment affect my valuation?
17. How are foreclosure sales considered?
18. How can I verify the value on my property?
19. If I bought my house within the last two years, shouldn’t the value be the same as what I paid for it?
20. How is actual square footage determined?
21. My house wasn’t complete on January 1. How was it valued?
22. My property doesn't compare to the expensive home down the street that just sold. Are you valuing my property based on that property?
23. My Notice of Valuation shows land value and improvement value, but I didn’t make any improvements. Why did my value increase when I have not done anything to improve my property?
24. How can I determine if the appraisal of my home is accurate?
25. If I disagree with the Assessor’s valuation of my property, what should I do?
26. What happens after I appeal?
27. Is the month of May the only time I can appeal a valuation?
28. What's the taxpayers responsibility in filing an appeal?
29. Who pays the taxes due on property I sold or purchased?
30. How do I change my address?
31. How do I change my name or add a name, or take a name off the ownership of my property?
32. What is the difference between a quitclaim deed and a warranty deed?
33. How do I change title on my property?
34. How can I correct the acreage on my property description?