Home and mortgage
Ada County, ID Property Tax Calculator
Ada County homeowners pay a median $2,655 a year in property tax, 0.52% of a median $512,300 home: above Idaho's 0.49% but below the national 0.94%.
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Property tax in Ada County by home value, at 0.52%
| Home value | A year | A month |
|---|---|---|
| $260,000 | $1,347 | $112 |
| $380,000 | $1,968 | $164 |
| $510,000 | $2,642 | $220 |
| $770,000 | $3,989 | $332 |
| $1,020,000 | $5,284 | $440 |
Ada County against Idaho and the US
| Effective rate | Median tax | Median home value | Median household income | |
|---|---|---|---|---|
| Ada County | 0.52% | $2,655 | $512,300 | $91,502 |
| Idaho | 0.49% | $2,038 | $418,600 | $77,800 |
| United States | 0.94% | $3,119 | $332,700 | $80,734 |
How this calculator works
Median real estate taxes paid ÷ median home value in Ada County, from the Census Bureau's American Community Survey 2020–2024 5-year estimates. The calculator starts at the county's median home value and rate.
Questions people ask
What is the property tax rate in Ada County?
The effective rate is 0.52%: a median $2,655 a year on a median $512,300 home. That's the 3rd highest of the 8 Idaho counties we cover.
How much is property tax on a $400,000 house in Ada County?
About $2,072 a year, $173 a month, at the county's effective rate, before any exemption.
How does Ada County compare with the rest of Idaho?
Its rate is above the state's 0.49%. Across Idaho, covered counties range from 0.38% to 0.64%.
How do I lower my Ada County property tax?
Apply for every exemption you qualify for, such as a homestead exemption, and appeal your assessment if it is higher than comparable homes sold nearby; the county assessor explains the deadlines.
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Sources
Updated by the RateHerald team. The maths is tested against worked examples; report a problem.