St. Mary's County, MarylandProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Payment deadline
- FY2027 tax year is July 1, 2026–June 30, 2027. Annual and first semiannual real-property payments are due September 30, 2026; the second semiannual payment is due December 31, 2026. The 2026 St. Mary's County tax sale was March 6, 2026.
- Assessment appeal
- Appeal the SDAT assessment within 45 days of the 2026 notice date; Maryland Tax Court appeal is within 30 days of a Property Tax Assessment Appeals Board order. See https://assessmentappeals.dat.maryland.gov/start.aspx.
- Rate information
- FY2027 county real-property rate for July 1, 2026–June 30, 2027: $0.8478 per $100 assessed value; municipal rates vary.
Exemptions & appeals
View exemption application (opens in a new tab)Exemption filing
One-time Homestead Tax Credit eligibility application through Maryland OneStop; the separate 2026 Maryland Homeowners' Property Tax Credit application deadline is October 1, 2026. See https://dat.maryland.gov/realproperty/Pages/Maryland-Homestead-Tax-Credit.aspx.
Senior relief
St. Mary's County Senior CAP, Senior 65-10, and Senior Matching credits are for eligible principal-residence owners; the Senior CAP and 65-10 applications are due September 1 each tax year and must be renewed annually. The county also links Maryland's Homeowners' Tax Credit.
Valuation limits
FY2027 local Homestead Credit cap is 3%; Maryland's state cap is 10%. St. Mary's Senior CAP separately freezes the county tax liability at a qualifying senior's base year, subject to age/income and annual application. Source: https://dat.maryland.gov/Documents/Accessible%20Documents/Real%20Property%20Reports/Tax%20Rates%20and%20Homestead%20Cap%20Percentages/County%20%26%20Municipal%20property%20tax%20rates%20in%20effect%20for%20July%201%2C%202026%20tax%20bills_0726-A.pdf.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →