Carbon County Property Tax Appeal Guide
In Carbon County, file your appeal by Within 30 days from the date on the Department of Revenue classification and appraisal notice, you may either request an informal review with the department (Form AB-26) or appeal directly to the County Tax Appeal Board (CTAB). If you first request an informal review, the appeal to the CTAB must instead be filed within 30 days from the date on the notice of the department's AB-26 determination. County boards meet from the first Monday in June to hear timely appeals. at Montana Dept of Revenue (assessment) / Carbon County Tax Appeal Board (appeals)'s online portal.
| Deadline | Within 30 days from the date on the Department of Revenue classification and appraisal notice, you may either request an informal review with the department (Form AB-26) or appeal directly to the County Tax Appeal Board (CTAB). If you first request an informal review, the appeal to the CTAB must instead be filed within 30 days from the date on the notice of the department's AB-26 determination. County boards meet from the first Monday in June to hear timely appeals. |
|---|---|
| Lien date | January 1, 2026 |
| Appeal body | County Tax Appeal Board (CTAB) |
| Assessor / district | Montana Dept of Revenue (assessment) / Carbon County Tax Appeal Board (appeals) |
| Online portal | File online |
How to File a Appeal in Carbon County
- Gather your assessment notice — it lists your account number and any access code
- File online through Montana Dept of Revenue (assessment) / Carbon County Tax Appeal Board (appeals)'s portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal CTAB hearing