Garda sergeants and inspectors are set to refuse to work an extra 30 hours a year from January 1.
The Association of Garda Sergeants and Inspectors said that the unpaid overtime, introduced under the previous Haddington Road pay deal, should be expiring in January.
AGSI members voted against the new Lansdowne Road deal, and are also set to face a pay freeze from next July as a result.
In a statement this morning, the AGSI said that it has no confidence in the Lansdowne Road deal being honoured.
It will advise members to stop taking on extra working hours from January.