Baltimore's Property Tax Burden: How Undervalued Vacant Lots Cost Homeowners

Baltimore homeowners effectively subsidize absentee landowners due to a systemic flaw in property tax assessments. A recent analysis reveals that vacant land across the city is significantly undervalued, shifting millions of dollars in tax burden onto residents and discouraging development. Correcting these assessments could be a key step toward a fairer system and increased housing supply.

Why Are Vacant Lots Undervalued in Baltimore?

The core issue lies in the assessment methodology. Maryland’s State Department of Assessments and Taxation (SDAT) commonly uses an allocation method. This approach assigns a value to land as a percentage of a building's assessed value. For a vacant lot with no structure, this method often fails to capture the land's true market value—its worth based on what a buyer would pay in the current market—and its development potential.

This practice leads to stark disparities. Research indicates that vacant lots in Baltimore are assessed, on average, at just one-eighth of their recent sale price. In one documented case, the land beneath occupied homes was assessed at 10 to 15 times the value of adjacent, similarly sized vacant parcels. This means absentee speculators pay minimal property taxes, creating a financial incentive to hold land idle rather than develop it.

How Does This Undervaluation Affect Homeowners?

The inequity has a direct financial impact on residents. Baltimore has one of the highest effective property tax rates in Maryland at 2.24%. This rate is the actual percentage of a property's value paid in taxes annually. When thousands of vacant parcels are under-assessed, the city must still raise the same total revenue to fund public services. As a result, the financial shortfall is passed on to homeowners and, by extension, renters.

This system erodes neighborhood stability. Approximately 13,000 residential properties stand vacant, which can lower property values and reduce the city's tax base. The low carrying costs for vacant land make it more profitable for owners to speculate by holding the asset for future price appreciation rather than contributing to the community through development.

What Is the Potential Solution?

A solution may not require new laws. Maryland's tax code already mandates that SDAT assess all property at market value. The agency has pledged a citywide reassessment of vacant land. Enforcing this existing rule with accurate, current sales data could correct the imbalance.

This approach aligns with the principles of a land value tax, a policy model that taxes land based on its development potential rather than its current use. By raising the annual cost of holding land idle, it encourages owners to either develop it or sell to someone who will. This can lead to more infill housing—new construction on vacant or underused lots within existing urban areas—and help reduce long-term vacancies.

What Changes Are Coming?

Baltimore is slowly moving toward reform. In 2026, the city will implement a vacancy surcharge, an added tax on abandoned buildings designed to motivate owners to rehabilitate them. While broader land tax reform is still under discussion, the pressure for change is building due to budget shortfalls and clear evidence of the current system's cost.

The path to a fairer property tax system in Baltimore hinges on consistent and accurate land assessments. By ensuring all properties, especially vacant land, are taxed at their true market value, the city can encourage development, expand the tax base, and ultimately reduce the burden on homeowners.