How to Calculate Residential Property Tax Using a Mil Rate

Property Tax Calculator

Ready to get started? Enter your tax values in the table below and have your tax amount automatically calculated. Note: consult with your municipality to confirm the tax calculation method is the same in your city or town.

For an explanation on how property tax is calculated, please skip to the next section, Basic Concepts.

Description Amount Total
Mil Rate /
Property Assessment x
Basic Tax Amount
Water Units Number: x Amount:
Property Tax Amount:
(Less any applicable reductions.)

Basic Concepts

Mil Rate

A property tax (or millage tax) is a financial charge, or levy, imposed upon an owner of a property. The property tax rate may be given as a percentage or per mil. Per mil is the tax amount per thousand dollars of property value. The per mil rate is also called a millage rate or mill. A percentage is the mil rate divided by 1000. Therefore, a mil rate of 7.8 is the same as a percentage of 0.0078%

Water Rate

Some municipalities add other charges, such as a water rate. This rate is a tariff charged for water supplied by the municipality, or public utility, by way of a network of pipes (in some regions, this may also include water trucks). Water rates may also apply to wastewater, which includes the costs of water treatment, storage, collection, and treatment.

Water rates may be assigned per unit. In other words, each apartment or dwelling unit. For example, a residential house with an upstairs and downstairs living unit is equal to two units.

Steps to Calculating Property Taxes

In order to calculate your property tax rate, you will need your property assessment notice, which is typically sent to you by your municipality, as well as the current mil rate, and current water rate. This may be published on-line (see links in the next section).

1. Determine Current Tax Rates

Find the current year rate fee in mils (if it is in percentage, multiply by 1000 before using the calculator on this page).

The table below was taken from the Current Tax Rates published by the City of St. John's. The following links are for other municipalities:

Sample Tax Rates, City of St. John's

Update: Mil rates were updated on January 4th, 2016, to meet requires of the St. John's Act. See City will Retain .5 Mil Rate Reduction for Residents not Connected to Water and Sewer for the announcement.

Category Rate Fee
2015 2016
Residential Realty
With water & sewer services 8.1 mils 7.8 mils
With either water or sewer services 7.6 mils 7.3 mils
Without water & sewer services 7.1 mils 6.8 mils
Vacant Land 8.1 mils 7.8 mils
Senior Citizens (GIS Recipients) 25% reduction 25% reduction
Water Rates (per unit per year)
Residential $615.00 $630.00

Source: Current Tax Rates, City of St. John's

2. Count the Number of Water Units

The main living quarters is one unit. Each additional apartment, add one unit.

3. Find Your Property Assessment Value

Look for the Total provided on a Notice of Assessment, or contact your city/town (be sure to have your account number handy).

Helpful Links:

4. Determine if a Reduction Applies

Some municipalities will offer a reduction such as a percentage discount for senior citizens.

5. Complete the Calculation

If Using a Property Tax Given as a Mil Rate

Multiply Mil Rate by Property Assessment Value = (A)
Divide result A by 1000 = (B)
Multiply Water Rate by Number of Units = (C)
Add (B) to (C) = Sub-total Tax Amount (D)
Reduce Sub-total Tax Amount (D) by Discount % (E) = Property Tax Amount (F)

If Using a Property Tax Given as a Percentage

Multiply Percentage by Property Assessment Value = (A)

Multiply Water Rate by Number of Units = (C)
Add (A) to (C) = Sub-total Tax Amount (D)
Reduce Sub-total Tax Amount (D) by Discount % (E) = Property Tax Amount (F)

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Water Rates

Is a house with an apartment 1 water unit or 2?

Each Seperate Living Quarters

Hi Stephen,

Thanks for writing. That is an important question.

Each seperate living quarters, known as a dwelling unit, is equal to one water unit. For example, a typical house with an owner living on the main floor, and renting an apartment in the basement, would be equal to two water units.