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Condo conversions and tax bills

What to keep in mind about your tax bill during a condo conversion.

Tax bills for a given fiscal year always reflect the status of the property on January 1 prior to the start of the fiscal year. If a property is sold or the use of the property changes, those updates aren’t immediately reflected in a tax bill.


There may be a time before each unit owner gets an individual tax bill. However, each unit owner is responsible for a share of the total property tax bill. To find the amount each owner has to pay, multiply the unit owner’s percentage of interest in the common area by the bill amount.

Here’s an example of how you might share a property tax bill:

  • A five-unit building converts to condos on August 30, 2018.
  • The building gets a quarterly property tax bill in November 2018 for $2,500.
  • The Master Deed for the building lists out the common area percentages for the condo units. The tax bill for each unit could be:
Unit Common area percentage Tax amount unit owner needs to pay
1 25% $625
2 20% $500
3 20% $500
4 20% $500
5 15% $375
To protect yourself in case another condo unit owner doesn’t pay their share, keep track of your payments. This provides proof that you paid your taxes.
Still have questions? Contact:
1 City Hall Square
Room 301
Boston MA  02201-2011
United States

The timing of tax bills

For the 2020 fiscal year, most condo conversions recorded before January 1, 2019 will get first-quarter tax bills on July 1, 2019.

When there is a big condo conversion, or there is an issue with recording the conversion, we will send tax bills in the third quarter.

We will bill most conversions during the 2018 calendar year in time for the first quarter of fiscal year 2020 that will begin on July 1, 2019. Here’s a timeline:

Calendar year of conversion Fiscal Year where conversion is shown on first-quarter tax bill
2017 2019
2018 2020
2019 2021
If you have any questions, contact the Assessing Department Tax Data Administration unit at 617-635-3783.