Yahoo states that new accounting legislation for deducting the expenses for employee stock options has cost the firm $65m more than last year.
Without the changes in accounting practice, Yahoo claims an 18% rise in first quarter earnings, despite losing market share to its bitter rival Google.
The results, released after the close of trade in the US on Tuesday, were in line with expectations but shares rose by 33 cents to close at $31.30 on the Nasdaq.
Yahoo remains confident and claims that the fast growing online advertising market offers the internet giant very exciting prospects.