Charles County, Maryland Paycheck Calculator (2026)

Charles County occupies southern Maryland on the western shore of the Potomac River, with La Plata as the county seat. The county levies a 3.03% county income tax on resident wages, below Maryland's statewide cap. MD's county income tax applies universally across all 24 jurisdictions, with rates spanning from low-tax Talbot through the statewide cap used by Montgomery, Howard, Prince George's, Baltimore County, and Baltimore City; Charles sits in the mid-band without hitting the cap. Naval Surface Warfare Center Indian Head Division, established in 1890 and converted to energetics R&D in the 20th century, occupies the western edge of the county and remains one of the largest US naval research installations specializing in propellants and explosives. Mallows Bay, south of Indian Head, holds the largest WWI-era wooden ghost fleet in the Western Hemisphere, designated a NOAA National Marine Sanctuary in 2019 with more than 100 sunken hulls visible at low tide. La Plata was struck by an F4 tornado on April 28, 2002, the strongest twister on record in Maryland; the rebuilt downtown remains a defining local landmark. Waldorf, the largest unincorporated community, anchors the population center along US-301. MD wages carry no SDI deduction beyond the universal county-income-tax layer. At $85,000 for a single Charles County resident, federal income tax is $9,870, Maryland state tax is $3,826, FICA combined is $6,503, and the county line is $2,576, leaving take-home of $62,226. Switch the calculator above to a different salary or filing status to see the Charles County math respond.