Revenue chiefs hope the system will be functional in time for the September return deadline.
The latest online crisis has surrounded customers receiving over-inflated income tax demands due to software problems.
‘We are confident the problem will be corrected before September, but we cannot guarantee the system will be problem free and we are dealing with the situation,’ said the spokeswoman.
She added the Revenue recognised that the online system had problems but hoped they would be ironed out.
The Revenue denied the problem would create a backlog of returns.
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