The Circuit Court in Dublin has ruled that the bin charges imposed by Dublin City Council in 2001 and 2002 were invalid.
This is the second such ruling by the Circuit Court.
It comes as a result of an appeal by Kimmage man James Hegarty against proceedings taken against him by the City Council for non-payment of charges.
The court found that Dublin City Council had not provided any incentive to Mr Hegarty to recycle his waste and therefore reduce the amount of charges paid.
It found that this was in breach of the city council's own waste management plan.
The Dublin City Bin Tax Campaign has described this as a very significant victory and is calling on householders who paid the charges in 2001 and 2002 to apply to the city council for a refund.