Montgomery County Property Tax Appeal Guide
In Montgomery County, file your appeal by Appeal the triennial Notice of Assessment to the Supervisor of Assessments within 45 days of the date printed on the notice. Maryland reassesses each property once every three years (the property is split into three groups; one group is reassessed each year), and reassessment notices for the group being revalued are mailed in late December for the January 1 date of finality. A homeowner may appeal on three occasions: (1) within 45 days of a triennial Notice of Assessment under Tax-Property §14-502(a); (2) by filing a petition for review on or before the date of finality (the first working day following January 1) in the two years the property is not at reassessment, under Tax-Property §14-503; or (3) within 60 days of the date of transfer for a new owner who buys after January 1 but before the next tax year begins, under Tax-Property §14-502. at SDAT — Montgomery Assessment Office's online portal.
| Deadline | Appeal the triennial Notice of Assessment to the Supervisor of Assessments within 45 days of the date printed on the notice. Maryland reassesses each property once every three years (the property is split into three groups; one group is reassessed each year), and reassessment notices for the group being revalued are mailed in late December for the January 1 date of finality. A homeowner may appeal on three occasions: (1) within 45 days of a triennial Notice of Assessment under Tax-Property §14-502(a); (2) by filing a petition for review on or before the date of finality (the first working day following January 1) in the two years the property is not at reassessment, under Tax-Property §14-503; or (3) within 60 days of the date of transfer for a new owner who buys after January 1 but before the next tax year begins, under Tax-Property §14-502. |
|---|---|
| Lien date | January 1, 2026 |
| Appeal body | Property Tax Assessment Appeals Board (PTAAB) |
| Assessor / district | SDAT — Montgomery Assessment Office |
| Online portal | File online |
How to File a Appeal in Montgomery County
- Gather your assessment notice — it lists your account number and any access code
- File online through SDAT — Montgomery Assessment Office'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 PTAAB hearing