As many as 1,000 Hewlett-Packard staff will go on strike for one day this month to show their disapproval of pay freezes and job cuts at the company.
The former EDS workers voted overwhelmingly to strike and will walk out for one day on 10 December.
The staff are part of the HP Enterprise Services division. They work on IT contracts for the Department for Work and Pensions in locations including as Newcastle, Washington and Preston.
HP said out of 914 ballot papers 358 workers voted yes to the strike while 100 voted no. The remaining papers were either not returned or spoilt.
Since HP acquired EDS in August 2008 there have been 3,400 job losses. There have also been pay freezes despite the supplier making large profits.
There is also an overtime ban, which begins next week.
PCS union general secretary Mark Serwotka, said, "It is disgraceful that hardworking staff who are shouldering greater workloads and contributing significantly to HP's revenue and profits should be rewarded with pay freezes and job losses.
"The ballot result illustrates the depth of anger amongst a workforce who face a second year of pay freezes despite the company delivering fourth quarter revenues of $30.8bn.
"Management cannot continue to take staff for granted and need to start rewarding staff properly and give them guarantees over job security."
HP said: “The company respects the decision of the employees that have voted in favour of local industrial action. We will continue to maintain a dialogue with the union in an attempt to avoid any form of action.
"In the event of any industrial action, we would expect minimal interference in service. In cooperation with our clients and the involvement of our company-wide global delivery capabilities, we will take the necessary measures to deliver the services that our clients require.”