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Calculating STAR exemptions

The formula below is used to calculate Basic STAR exemptions. Enhanced STAR exemptions are calculated the same way, except the base amount for the Enhanced STAR exemption in the 2018-2019 school year is $66,800 (rather than $30,000 for Basic STAR). The dates pertain to assessing units that publish their final assessment rolls on July 1.

April STAR certification

Prior year equalization rate (or current year level of assessment for municipalities conducting reassessments)

× $30,000

× Sales price differential factor

= Amount A 

Prior year Basic STAR benefit amount

× .89

= Amount B

The higher of Amount A and Amount B becomes the Basic STAR benefit.

July/August—possible recertification

If the change in level of assessment between the prior and current assessment roll is more than 5 percent, then we estimate a new STAR benefit. We compare the new amount to the benefit certified in April. If the difference between the original amount and the new estimate is 5 percent or more, then we certify a new STAR benefit.

Estimated benefit calculation

Prior year equalization rate

× Change in level of assessment factor*

× $30,000

× Sales price differential factor

= Amount C

Prior year Basic STAR benefit amount

× Change in level of assessment factor*

× .89

= Amount D

If the higher of Amount C or Amount D varies by 5 percent or more from the STAR benefit certified in April, then the higher of Amount C or Amount D is certified as the STAR benefit.


* Change in level of assessment—net percentage increase or decrease in the assessed valuation of all taxable real property in an assessing unit from one final assessment roll to the next. Does not include:

  • increases or decreases in value attributable to physical or quantity changes in the property
  • assessed valuation of:
    • special franchise property
    • railroads subject to a ceiling assessment
    • wholly exempt properties
Updated: