The result of the strike ballot to defend hundreds of jobs at the Passport Office in Newport and interview offices around Britain was due on Wednesday of this week.
Around 3,000 PCS union members in the Identity and Passport Service (IPS) have been voting over strikes in defence of the jobs.
If there is a yes vote then a strike will hit offices in London, Glasgow, Peterborough, Belfast, Liverpool, Durham, Newport, Southport (GRO) and all smaller interview offices.
Management plans to make nearly 500 people within the agency redundant—including 300 in Newport.
There has been huge opposition to the plans to close the offices, with a 700-strong march in Newport in October.
PCS has been involved in a consultation exercise with management but the union does not believe that they or the government are serious about negotiating meaningfully.
Union activists have been campaigning to get the biggest yes vote for action.