Revenue & Customs reported this week that it had cleared a backlog that had built up in its self assessment processing systems after carrying out maintenance on its mainframe systems.
An HRMC spokesman confirmed that no returns were processed until the CESA mainframe was re-instated on 25 April. "This is a normal, routine occurrence that occurs most years," he said.
Returns submitted online while the backroom systems were unavailable were queued up within the Revenue's Validation Engine for submission when CESA was brought back into action, the official said.
A considerable backlog built up when CESAR was brought back online but was flushed out over the bank holiday weekend.
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