Australians are being warned to expect delays across Centrelink, Medicare and child support services for most of next week.
The Department of Human Services confirmed some staff will be taking industrial action next Monday, Wednesday and Friday.
General manager Hank Jongen said the strike - in response to the government's controversial automated debt recovery scheme - has the potential to disrupt telephone and face-to-face services.
Customer payments, however, will not be affected.
The public service union said workers were taking the industrial action over the "continuing damage" caused by senior management and the Turnbull government - not only over the Centrelink debt controversy but the stalled enterprise bargaining process.
CPSU national secretary Nadine Flood claims around 34,000 staff have gone more than three years without a pay rise.