A director at a Guernsey accountancy firm says the States faces a challenge to build public trust in the revenue service.
It follows the States' decision to axe a contract with IT infrastructure company Agilisys by the end of July – halfway through its 10-year tenure.
The need for a new computer system, which has since been brought in, was among reasons previously given for delays in tax returns being processed.
Director of accountancy firm TCS Guernsey Tim Chilestone said: "The trust of the public in the revenue service is very, very low. That's the biggest task they have making the public trust them again."
Mr Chilestone said people had faced difficulties finding out information.
He said: "A lot of people are losing track of where they are… Do they actually owe the revenue service any money? Does the revenue service owe them?"
Mr Chilestone said the system made it easy for people to make minor mistakes, especially for those who conducted their own bookkeeping.
