Boston Mayor Michelle Wu’s controversial plan to raise commercial tax rates hit another snag on Beacon Hill Monday, when it was blocked by a member of the Senate, with the City Council’s annual tax-rate-setting hearing bearing down the next day.

Sen. Nick Collins of South Boston used a procedural maneuver to delay a vote on the controversial and time-sensitive Boston property tax bill until the Senate meets again on Thursday. Boston Mayor Michelle Wu says the bill is necessary to prevent a major price hike for residential taxpayers.

A senator from South Boston delayed action Monday on a controversial, time-sensitive Boston property tax reclassification bill, which is now on ice until after the deadline for action recommended by Boston Mayor Michelle Wu.

Boston City Hall's assessing chief on Tuesday voiced an ever-tightening timeline for Beacon Hill to act on the city's property tax plan, while also declining to share data that some skeptical officials have said could be key to moving the needle on the controversial bill.

The State Senate is set to take up a proposal by Boston Mayor Michelle Wu to change the way property taxes are calculated in the hope of heading off a dramatic increase in residential rates.

The state Senate delayed a vote Monday on Boston’s request to shift its property tax burden away from homeowners, potentially jeopardizing the city’s ability to include the change on this year’s tax bills.