General Motors

(GM) - Get Report

revised its second-quarter results Tuesday, widening its loss due to a higher tax provision on the pending sale of its finance arm, GMAC.

The world's largest automaker also said in a regulatory filing that it's working with GMAC's buyers to avoid a delay in the closing of that deal until 2007.

The company widened its loss for the second quarter by $200 million to $3.4 billion, or $5.97 a share. Last week, GM

reported a loss of $3.2 billion, or $5.62 a share, on heavy charges related to its restructuring efforts. A year earlier, GM posted a second-quarter loss of $987 million, or $1.75 a share.

The new loss figure comes as GM increased its tax provision on the sale of the GMAC stake to $690 million from its previous estimate of $490 million. The company, which is selling 51% of GMAC to a private equity consortium led by Cerberus Capital Management, said the provision was adjusted to reflect differences in book value and tax basis at several GMAC subsidiaries.

The revision doesn't affect GM's adjusted earnings, which surpassed Wall Street's expectation by a wide margin. Excluding charges, the company earned $1.2 billion, or $2.03 a share. Analysts polled by Thomson First Call had an average estimate adjusted earnings of 55 cents a share.

The revision marks the second time this year that GM has changed its quarterly numbers after its earnings release. After the first quarter, the company revised its previously announced loss of $323 million to a profit of $445 million to reflect new accounting over a health care agreement.

In the regulatory filing Tuesday disclosing the second-quarter revision, GM said the Federal Deposit and Insurance Corp. announced a six-month moratorium on decisions regarding the change in control in industrial loan companies. GM said the moratorium could affect approval of the GMAC deal, and it's working with buyers to prevent a delay.

The automaker's shares were recently down 40 cents, or 1.3%, to $30.90 in after-hours trading. They dropped 2.9% in regular trading hours, after GM reported that its U.S. sales dropped 19% in July.