Tax Assessor's Office


The Tax Assessor’s office is located in Room 115 of City Hall. This office can assist you online with detailed information on real estate and personal property tax assessments and property tax maps. The assessor's office also keeps track of ownership changes, maintains maps of parcel boundaries, keeps descriptions of buildings and property characteristics up to date, keeps track of individuals and properties eligible for exemptions and other forms of property tax relief and analyzes trends in sales prices, construction costs, and rents to estimate the value of all assessable property.

Property Tax & Records

For FY21, the total value of taxable property in Portland is $8.037 billion, which generates $187.3 million in property tax revenue to fund the operation of Maine’s largest city. The Assessor’s Department maintains tax records on over 24,000 real estate accounts, 3,200 business personal property accounts, and 481 tax maps.

Both real estate (land and buildings) and personal property (tangible goods) are subject to taxation, unless they are exempted by law or subject to another form of taxation, such as the excise tax for motor vehicles and boats. Since home furnishings are largely exempt from personal property taxes, the property tax bill for most Maine homeowners is based on the value of the land, the house and the outbuildings.

FY21 Mill Rate, Tax Due Dates and Assessment Ratio

Property taxes are levied according to a mill rate. The mill rate is the dollars/cents per $1,000 of value that you will pay in property taxes. The mill rate for FY21 (July 1, 2020 through June 30, 2021) is $23.31 or .02331. For example, if you own a home valued at $100,000 then your tax bill will be $2,331 (or .02331 x 100,000). 

The first half of tax amounts due is Friday, October 30, 2020
The second half of tax amounts due is Friday, March 19, 2021

Portland's FY21 ratio between assessed value and market value has been declared at 77%. This 77% ratio will be applied, by law, to the following tax exemptions which are then deducted from the assessed value of the property:

  • Veteran's Exemption $6,000 X 77% = $4,620 of exempted value or a direct tax reduction of $107.69
  • Blind Exemption $4,000 X 77% = $3,080 of exempted value or a direct tax reduction of $71.79
  • Maine Homestead Exemption $25,000 X 77% = $19,250 of exempted value or a direct tax reduction of $448.72