Dublin Bus has announced it is to stop refunding customers who overpay in cash.
It is part of the company's plans to move to cashless payments on all buses under the new BusConnects programme.
The new system will see a non-redeemable 'extra payment receipt' issued instead and will take effect from the 9th of September.
The company said the overpayments will go towards improving its services and funding the Community Spirit Awards.
Dublin City Councillor Mannix Flynn says it is an outrageous move.
He said: "Dublin Bus are very wrong in thinking that they can simply turn around and tell their customers that they're going to pocket that kind of money.
"This is kinda like summer madness. It's coming at a time when the Dáil is on holidays, and Dublin City Council are out on their annual break and they think they can push this through.
"I call on Dublin people and anybody who uses the public transport system to reject this."
Fianna Fáil Spokesperson on Transport Robert Troy TD has encouraged Dublin Bus to re-examine its decision to scrap refunds for customers who have overpaid for cash fares.
He said: “Everyone is in agreement that Dublin Bus should move to a cashless service as soon as possible.
"However, I believe customers should continue to have the option to claim a refund until a cashless service is actually introduced...Dublin Bus should defer its decision to end cash refunds until the full introduction of cashless services"
In a statement issued by Dublin Bus, they said that the removal of the refund due service is to "facilitate the National Transport Authority’s objective to move to cashless operations on all buses under the BusConnects programme."
The continued: "Dublin Bus customers will no longer be issued a ‘refund due’ receipt if they overpay for their journey with cash. Instead, they will be issued with a non-redeemable ‘extra payment’ receipt.
"We encourage our customers to purchase a Leap Card which is at least 20% cheaper than paying for their journey using cash and is more convenient to use. 70% of our customers already use Leap Card to pay for their journey.
"If a customer overpays for their journey with cash after September 9, the extra change will go towards continuing to improve our services and to local communities across the Greater Dublin Area through the Community Spirit Awards."