The proposed withholding rules on sales or exchanges of real estate generally require a withholding agent to withhold personal income tax or corporate excise. The purpose of 830 CMR 62B.Currently, withholding is not required on sales of Massachusetts real estate. Welcome to MassTaxConnect, the Massachusetts Department of Revenue's web-based application for filing and paying taxes in the Commonwealth. A Massachusetts resident is taxed on income earned everywhere, so capital gain from the sale of a property in California is taxable to Massachusetts. To start, register for a sales tax permit with the Massachusetts Department of Revenue (DOR). They call it "Massachusetts source income" and most states use similar language. Besides real estate property taxes, Massachusetts has an income tax, a sales tax, an excise tax, and a tax related to the failure to obtain health insurance. As you can imagine, this can add up to quite a bit of money. File your Massachusetts income tax return.