A proposed Caerphilly council tax rise of 6.25% from April will mean bills have jumped by 22.5% in just four years.
Research by Plaid Cymru showed that residents on Band D council tax will pay £1658 in 2026-27 - £305 more than in 2023-24 when the figure was £1,353.
In this current financial year council tax went up by 7.9% which followed a 6.9% increase in 2024-25 and 7.9% rise in 2023-24.
Councillor Charlotte Bishop, leader of the Plaid Cymru group, said: “Working families seem to be the ones expected to just absorb these increases year after year.
“There are support measures for people on the lowest incomes, and that’s right, but there’s very little recognition of working families who are just about coping. A lot of households have both parents working because they simply can’t afford not to, yet they don’t qualify for much help at all.
“Once council tax, energy, food and childcare are paid, there’s often nothing left — just worry about how to get through the next month. A rise of over 22% in just four years, especially during a cost of living crisis, is hard to justify.”
Co-Deputy Group Leader Councillor Colin Mann said: “We already have large numbers of working people going to food banks to prevent their families going hungry. This proposal lumps even more pressure on everyone. Pensions are lagging further behind. Many private sector pensions pay no more than 2.5 to 3% increase, often less. OAP pension rises are more generous but not comparable to the increased costs of public services, food and energy, of course.”
Fellow Co-Deputy Group Leader Councillor Gary Enright added: “While the proposed council tax rise is totally unacceptable, I would also like to see a wider review of what the Labour administration has done for residents with the money raised from bills. What did the public get for their money in the past and now?"