NSW Minister for Customer Service Victor Dominello said about 2.8 million policyholders across the state had already claimed $156 million, with the deadline for claiming a refund extended one final time from June 30 to September 30 this year.

"We know that cost of living is a big issue facing households, which is why we delivered this refund, potentially worth up to $120 per refund," Mr Dominello said.

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"Claiming a refund is simple and easy and can be done via Service NSW either online, over the phone or in store.

"We are giving motorists an extra three months to claim their refund.

"A decision on how unclaimed monies will be returned to motorists will be confirmed following consultation with NRMA and Choice."

NRMA spokesman Peter Khoury also urged motorists to act.

"The NRMA is urging all motorists to take a few short minutes, get online or call the number, and get their refund if they are eligible," he said.

"A one-off cash injection into the bank account of up to $120 will go a long way to helping the family budget and it would be a shame for people to miss out."

Further information is available online.