Russell Goodway, the cabinet member for economy on Cardiff Council, told ITV Cymru Wales' Sharp End programme that Wales' largest local authority would also be struggling to balance the books after cuts to funding in the Welsh Government's Draft Budget.
He said: "We employ 10,000 full-time equivalent, excluding teachers. I doubt by the time we get to 2017 that half of those people will be working for the council."
More top news
The first planting of the Woodland Trust's WW1 Centenary Wood is set to get underway in the Gwendraeth Valley, near Kidwelly.
This week Hannah is in Carmarthenshire finding out what is happening at the National Botanic Garden of Wales, 15 years after it first opened
A study funded by The Brain Tumour Charity aims to discover how long it takes on average for adult brain tumour patients to be diagnosed.