Eastleigh Borough Council's council tax and benefit system is due to be down all day today.
In a post on its website yesterday evening, the authority said the system will be offline as it processes £150 energy rebate payments.
A council spokesperson apologised for the outage and the "inconvenience this may cause".
They added: "We're advising customers to call our customer service team on Friday if they need to discuss any of these areas as we will not be able to access accounts at all on Thursday."
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