Dublin City Council has overwhelmingly voted not to send a representative to the RIC commemoration event in Dublin Castle.
A motion put forward by Independent Councillors objecting to the ceremony was carried by 38 votes to 10.
The result has no bearing on the controversial government event going ahead, but highlights the local council's dissatisfaction with it and confirms they will boycott.
The motion, which was put forward by Cieran Perry, Nial Ring, Christy Burke, John Lyons, Noeleen Reilly, and Daithi Doolan, said only a government suffering from a "ashamed of our revolutionary history would encourage this disgraceful event".
The emergency motion also said the event would "question the very legitimacy of our battle for independence".
Earlier today the Lord Mayor of Dublin Paul McAuliffe confirmed he and members of the city council would not be attending as they are hosting the Greek President in the Mansion House on the same day.
He also said he would not be sending a deputy.
Two former Lord Mayors, Nial Ring and Christy Burke, have both blasted the event.
Burke yesterday said he'd put any invitation to the event "in the recycle bin" while Ring tonight said commemorating the Black and Tans would be an "insult to the memory of those who fought for Irish freedom".
He said: "My own family (grandfather and his four brothers) had direct contact with the RIC especially on Bloody Sunday (21st November 1920)when they took an injured boy from Croke Park.
"Joe Traynor (19) bled from his two bullet wounds (one in the back)o death on our kitchen table in skill Gardens and my family left his body on Ballybough Road for collection by ambulance that evening.
"He was taken to Jervis Street hospital where he died that night. The following day the reprisals were swift.
"Three of the Ring brothers were taken into custody and subsequently interred in Ballykinlar Internment Camp (the other two, including my Grandfather went on the run)."
