The Department of Human Services is standing by its position on penalty pay for casual staff saying its loading rates fit within what is required in the enterprise agreement. The Community and Public Sector Union has approached the Fair Work Commission about alleged underpayment of casual staff at Human Services, which looks after Centrelink and Medicare. The long-term casuals had either not been paid an annual salary advancement of 2.75 per cent or had not been paid overtime rates, according to the union which believed this was a breach of the enterprise agreement.