Taxes in Gaithersburg
Gaithersburg's tax picture combines Montgomery County's below-average property-tax rate with a local income tax currently, genuinely in transition.
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Learn moreMontgomery County's below-average property tax rate
Montgomery County's effective property tax rate (~0.87%) runs genuinely below the Maryland statewide average despite the county's high assessed values.
A local income tax currently in transition
Montgomery County's mandatory local piggyback tax sits at a flat 3.2% today, but the County Council's May 2026 vote sets a progressive structure (2.7%/3.0%/3.3%) effective July 1, 2027 -- a real, current, still-unfolding change.
Maryland's state income tax and sales tax layers
Maryland's 10-bracket state income tax (2%-6.5%) and flat 6% statewide sales tax (no local add-on) both apply in Gaithersburg as elsewhere in Maryland.
Key takeaways
- Montgomery County's effective property tax rate (~0.87%) runs below the Maryland statewide average.
- Montgomery County's local income tax shifts from a flat 3.2% to a progressive structure effective July 1, 2027.
- Maryland's flat 6% statewide sales tax carries no local add-on, unlike the income-tax layer.
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