The Inland Revenue has apologised for disruption to its online self assessment service and offered 14 days' grace for resubmission of "failed" returns.
The SA Online website seemed to be recovering today after it appeared to collapse under the weight of traffic on Sunday.
The Revenue said a very high level of demand had slowed the service down in the run-up to today's deadline for submission of 2004 tax returns.
Several TaxZone readers reported an improvement this morning. Many readers were unable to access SA Online at all late on Sunday, or encountered other problems during the weekend.
A Revenue spokesman told TaxZone at noon today: "The SA On-line service is working and received thousands of returns over the weekend.
"There is a very high level of demand and this is resulting in the service...