Montgomery County, MD — Property Tax Underwriting Guide
Maryland · Cyclical hold until revaluation
What this means for multifamily underwriting
Montgomery County is the wealthiest jurisdiction in Maryland and a major multifamily market. The triennial cycle means taxes are stable between reassessments.
Transaction type breakdown
Maryland's State Department of Assessments and Taxation (SDAT) reassesses all real property on a three-year rolling cycle. A sale does not trigger an off-cycle reassessment.
Refinance has no effect on assessed value.
Ownership transfer does not trigger an off-cycle reassessment; the triennial cycle governs.
Tax appeal information
10.0 mill (1.0% effective) is an estimate for Montgomery County. Rates are among the lower ones in the DC metro.
Guide review
County guidance last reviewed: June 15, 2026
Tax-rate scope: Tax-rate scope is not established as parcel-specific; confirm the parcel's taxing-authority stack.
Official sources: SDAT (Maryland Assessor)
Triennial model is well established; millage reflects combined State and County rates.
Parclio estimates are underwriting guidance, not legal or tax advice. Always verify millage rates, the seller's assessed value, and appeal deadlines with the county assessor or local counsel before relying on these numbers for a credit decision.
Run a tax reset estimate for Montgomery County
Use Parclio's estimator to model the post-closing tax bill, NOI impact, DSCR change, and underwriting memo language for your next Montgomery County deal.