We are aware of a property tax phase-in for Derby properties that is affecting their assessed value for the 2026-2027 fiscal year.
Click here for more information on phase-ins.
If you currently have a property listed on the MLS for a parcel that is affected by the phase-in, we recommend that you edit the assessment and tax amount to reflect the phase-in amount:
Click here for more information on phase-ins.
If you currently have a property listed on the MLS for a parcel that is affected by the phase-in, we recommend that you edit the assessment and tax amount to reflect the phase-in amount:
Beginning with the 2026-2027 fiscal year, the City of Derby is undergoing a property tax phase-in based on the 2025 reassessment. The phase-in is projected to be fully implemented in the 2030-2031 fiscal year. This process allows the city to phase in all, or a portion, of real property assessment increases resulting from the 2025 revaluation over the next 5 years.
If your assessment increased, that change will be implemented gradually using the following equation:
2024 Grand List Amount + X% of increase to 25 Grand List = Assessment for phase-in year
Year 1: X = 20% of the difference between 24GL and 25GL will be assessed
Year 2: X = 40% of the difference between 24GL and 25GL will be assessed
Year 3: X = 60% of the difference between 24GL and 25GL will be assessed
Year 4: X = 80% of the difference between 24GL and 25GL will be assessed
Year 5: X = 100% of the difference between 24GL and 25GL will be assessed
For example, if your assessment increased by $20,000 (2024 Grand List assessment was $100,000 and your 2025 Grand List assessment is $120,000) your phase-in assessments will be calculated as follows:
- Year 1: 100,000 + (20% x 20,000) = 104,000
- Year 2: 100,000 + (40% x 20,000) = 108,000
- Year 3: 100,000 + (60% x 20,000) = 112,000
- Year 4: 100,000 + (80% x 20,000) = 116,000
- Year 5: 100,000 + (100% x 20,000) = 120,000
During the 2026-2027 tax year, the mil rate for the City of Derby will be 38.44. This mil rate should decrease each year until the 2030-2031 fiscal year.
Derby Assessor site: https://derby.mapxpress.net/portal.asp
The Derby Assessor look-up site is not factoring in the phase in for the affected properties. The assessment figure it is showing is based on the entire amount.
The tax bills that are sent to the homeowners, however, reflect the phase-in and are accurate.
You can search the Derby Tax Collector billing site here: https://www.mytaxbill.org/inet/bill/home.do?town=derby
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