The rise in revenue was offset by a 1.5% decrease in organic revenue compared with 2003, which Interpublic blamed on weaker results at troubled advertising network Lowe.
The preliminary figures show operating income of $391m, although Interpublic said it had identified items that could push this figure up by $35m.
In March, the company, headed by chairman and chief executive Michael Roth, first revealed that it would not be able to file results for 2004, and today Interpublic said that it still does not know when it will have the figures or restate financial statements for prior periods.
It said in a regulatory filing today: "We are working diligently to become current in our filings as quickly as possible, but we can not identify a date for completing the process because of the complexity of the task, the shortcomings in our control environment and the early stage of the process. We can provide no assurance as to when we will become current in our SEC reporting."
Shares in the company, traded on the New York Stock Exchange, rose by more than 3% when the market opened this morning on the news that Interpublic had been granted a waiver over breaking loan agreements. Shares were trading at $12.63, a rise of 37 cents.
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the .