19 July 2012
If ministers continue to refuse to negotiate an agreement, the union will announce further action at a later date.
The action includes staff across the Home Office, including the UK Border Agency, the Identity and Passport Service and Criminal Records Bureau.
PCS general secretary Mark Serwotka said: "The lives of staff have been made intolerable by these cuts and they're at breaking point.
"Ministers have known about these issues for a very long time and need to act now to sort out the chaos they have caused.
"They're acting recklessly in cutting so many jobs and privatising services, and are provocatively refusing to talk to us with a genuine desire to reach an agreement."