Maryland Property Tax Appeal Deadline 2026: 45 Days from Notice Date
Updated March 2026
Maryland's three-year assessment cycle decides who gets a notice in 2026, not who is allowed to appeal. If you receive a notice, you have exactly 45 days to file, no exceptions. If you do not, you can still appeal by filing a Petition for Review at the turn of the year.
Maryland Property Tax Appeal Deadline: The 45-Day Rule
Universal Deadline: 45 days from assessment notice date
2026 Assessment Groups:
- Group 1: Notices mailed December 2025
- Group 2: Notices mailed January 2026
- Group 3: Previously appealed properties
- New construction: Anytime notices
Your deadline = Notice date + 45 days
Maryland's Three-Year Cycle Explained
How It Works:
- Properties divided into three groups
- Each group assessed every three years
- 2026 is Group 1's year, so Group 1 gets notices
- Groups 2 and 3 get no notice, but keep their appeal right
- Their route is the Petition for Review, filed around January 1
The Petition for Review (Off-Cycle Years)
This is the part most Maryland homeowners never hear about. Under Tax-Property Article 14-503, a taxpayer may appeal the value or classification of real property by filing a Petition for Review on or before the date of finality for the next taxable year. Maryland defines the date of finality as January 1 (Tax-Property Article 1-101). Because January 1 is a state holiday, SDAT's own guidance is to file by the first business day following January 1.
So a Group 2 or Group 3 owner who believes their value is too high does not wait two more years. They file a petition at the turn of the year and the appeal applies to the next taxable year. Same evidence, same boards, same process. The only difference is that nothing arrives in the mail to remind you.
SDAT publishes a combined "Petition for Review or New Owner Appeal" form for this. It is worth a calendar reminder in early December, because unlike the 45 day notice window, nothing prompts you.
There Is No Such Thing as a "Group 1 County"
This trips up a lot of Maryland homeowners. The three groups are not counties. SDAT divides every jurisdiction into three geographic groups and reassesses one of them each year, so Anne Arundel, Baltimore County, Montgomery and Prince George's each contain Group 1, Group 2, and Group 3 neighborhoods at the same time. Your group depends on where in the county you sit, not which county you are in.
That means you cannot work out your year from a county list, and any list that claims to show you one is guessing. The reliable signals are simpler: did a Notice of Assessment arrive around late December or early January? If yes, you are in this year's group and the 45 day clock is running. If not, you are not, and the Petition for Review is your route. Your local assessment office or SDAT's Real Property Search will confirm it in a phone call or a lookup.
Exceptions That Can Appeal Any Year:
- New construction
- Major improvements
- Ownership changes
- Successful previous appeals
- Clerical errors
Understanding Your Notice
Key Elements:
- Mail date: Printed on notice
- Current assessment: Your existing value
- Proposed assessment: New value
- Deadline date: Sometimes printed
- Appeal instructions: Read carefully
Calculate Your Deadline:
- Find notice mail date
- Add 45 days
- Mark calendar
- Plan backwards
- Don't wait
Notice Timing by County:
- Montgomery: December-January
- Prince George's: January
- Baltimore County: December-January
- Anne Arundel: January
- Others: Varies
Maryland's Three-Level Appeal System
Level 1: Local Assessment Office
First stop (optional but recommended):
- Informal review
- No fee
- Quick adjustments
- Errors fixed
- Sometimes enough
Level 2: Property Tax Assessment Appeals Board
Formal appeal:
- File within 45 days
- $25 fee
- Three-member panel
- Hearing scheduled
- Decision binding
Level 3: Maryland Tax Court
If board denies:
- 30 days to file
- Legal process
- Expensive option
- Attorney advised
- Final venue
Knowing the date is the easy part. The date only matters if the county's number is actually too high, and nobody checks that number for you.
Evidence That Wins in Maryland
Most Effective:
- Recent comparable sales - Within 1 mile, same subdivision
- Professional appraisal - Maryland certified
- Condition defects - Document thoroughly
- Functional obsolescence - Outdated features
- External factors - Traffic, noise, commercial
Maryland-Specific Issues:
- D.C. proximity premiums/problems
- MARC station impacts
- Military base noise (Andrews, Meade)
- Bay Bridge traffic
- School district boundaries
Regional Considerations:
D.C. Suburbs: Location precision crucial Baltimore Region: Neighborhood variations Eastern Shore: Seasonal factors Western Maryland: Mountain challenges Southern Maryland: Rural transitions
Common Maryland Assessment Problems
Problem #1: D.C. Spillover Effects
- Federal worker demand
- Metro access valued
- But traffic nightmares
- Noise increasing
- Infrastructure stressed
Solution: Document negative externalities
Problem #2: Neighborhood Transitions
- Block-by-block differences
- Gentrification uneven
- Safety perceptions
- School changes
- Individual property matters
Solution: Micro-location evidence
Problem #3: Older Home Penalties
- Assumed renovated
- Actually original
- Systems outdated
- Maintenance deferred
- Buyers discount heavily
Solution: Prove actual condition
Problem #4: Waterfront Complexity
- Chesapeake Bay issues
- Erosion problems
- Pier maintenance
- Environmental restrictions
- Not all waterfront equal
Solution: Specific water access details
County-Specific Strategies
Montgomery County
Challenges:
- Highest values
- Sophisticated assessors
- Professional market
- D.C. influence
- Tough appeals
Approach:
- Professional evidence
- Precise comparables
- Expert testimony
- Condition focus
- Hire help
Prince George's County
Challenges:
- Wide disparities
- Safety perceptions
- School variations
- Transit impacts
- Rapid changes
Approach:
- Neighborhood specific
- Recent sales only
- Document problems
- School data
- Crime statistics (carefully)
Baltimore County
Challenges:
- Urban vs suburban
- Age of housing
- Infrastructure varies
- School differences
- Market segments
Approach:
- Subdivision focus
- Age adjustments
- Condition evidence
- Local knowledge
- Similar properties
Anne Arundel County
Challenges:
- Annapolis premiums
- Military impacts
- Bay access varies
- Tourist areas
- Diverse county
Approach:
- Location precision
- Water documentation
- Military noise
- Seasonal factors
- Professional help
Maximizing Your 45 Days
Days 1-10: Initial Review
- [ ] Confirm receipt date
- [ ] Calculate deadline
- [ ] Review increases
- [ ] Check data accuracy
- [ ] Decide to appeal
Days 11-25: Evidence Building
- [ ] Photograph property
- [ ] Pull comparables
- [ ] Get repair estimates
- [ ] Consider appraisal
- [ ] Visit assessment office
Days 26-35: Preparation
- [ ] Complete forms
- [ ] Organize evidence
- [ ] Write summary
- [ ] Make copies
- [ ] Plan submission
Days 36-45: File and Confirm
- [ ] Submit appeal
- [ ] Pay fee
- [ ] Get receipt
- [ ] Request hearing
- [ ] Don't wait until day 45
A real AppealDesk order, Montgomery County
In April 2026, a homeowner in Montgomery County ran the check. The county had their home on record at $644,300, while recorded sales of comparable homes supported about $567,131: an over-assessment of $77,169, worth roughly $904 per year if corrected. Their packet laid out the comparable sales, the forms, and the filing steps. Nobody at the county was ever going to run that check for them.
A deadline you meet with no evidence behind it is just paperwork. Comparable sales are what boards actually respond to, and pulling your county's number is where that starts.
Special Maryland Considerations
Homestead Tax Credit
- Caps increases
- Must apply once
- Doesn't affect appeal
- Can have both
- Very valuable
Renters' Tax Credit
- Income-based
- Age/disability factors
- Separate program
- Not appeal-related
- Worth checking
Constant Yield Tax Rate
- Maryland requirement
- Affects tax bills
- Not assessment
- Confuses many
- Separate issue
Historic Property Credits
- Maintenance burden
- Use restrictions
- May lower value
- Document limits
- Special evidence
The Three-Year Cycle Impact
If You Miss Your 45 Days:
- You do NOT have to wait until 2029
- File a Petition for Review at the turn of the year instead
- It applies to the next taxable year
- You lose the current year, not the whole cycle
- The 45 day route is still faster and cheaper
Planning Ahead:
- Know your cycle
- Mark future years
- Track improvements
- Document changes
- Be ready
Your Maryland Action Plan
Immediate Actions:
- Verify your cycle - Are you Group 1?
- Check notice date - If received
- Calculate deadline - Exactly 45 days
- Mark calendar - Multiple reminders
- Start today - Time limited
Evidence Priorities:
- Data accuracy - Check everything
- Comparables - Recent, nearby, similar
- Condition issues - Photo document
- External factors - Noise, traffic, etc.
- Professional help - Consider if large gap
Filing Strategy:
- Visit office first - Try informal
- File by day 35 - Safety margin
- Request hearing - Better results
- Prepare thoroughly - One shot
- Attend hearing - Critical
The Bottom Line
Maryland's 45-day deadline is inflexible, so if you got a notice, treat it as the hard date it is. Missing it does not cost you three years, though. The Petition for Review keeps the door open every year at the turn of the calendar, whichever group you are in.
The combination of D.C. proximity effects, neighborhood transitions, and waterfront complexities creates both assessment challenges and appeal opportunities. Success requires quick action and solid evidence.
Whether you're fighting Metro-area premiums in Montgomery County or documenting Bay erosion in Anne Arundel, 45 days goes fast. Start the day your notice arrives.
Critical Reminder: Maryland's three-year cycle decides who receives a notice, not who may appeal. If you receive one, you have exactly 45 days, not 45 business days, not approximately 45 days, but exactly 45 calendar days. If you do not receive one, Tax-Property Article 14-503 lets you file a Petition for Review on or before the date of finality, which Tax-Property Article 1-101 sets at January 1, and SDAT accepts through the first business day after it. There is also no such thing as a Group 1 county: every Maryland jurisdiction contains all three groups, so the arrival of a notice, not a county list, tells you which year is yours.
