The Canada Revenue Agency said today its online tax filing system was back up and running.

The federal government department said it has resolved the technical issues that prevented people from filing their 2006 tax returns.

“We appreciate your patience and apologize for the prior interruption to service,” the agency said.

CRA commissioner Michel Dorais ordered the agency’s 75 databases shut down March 5 after noticing “some irregularities” following software maintenance the previous weekend.

“I would like to thank taxpayers for their patience and understanding during this unprecedented service outage,” said Dorais. “I would also like to reiterate once again that the integrity and safety of personal data was never at risk.”

All online access to Efile, Netfile and the My Account feature was affected by the shutdown.

The CRA said the processing of returns — including the issuing of refunds — was delayed until the problem could be fixed. The processing delays also affected paper-based returns that were mailed.