Caterpillar Inc. is likely to get some Republican support Tuesday when the giant maker of construction and mining equipment faces criticism of its accounting policies at a Senate subcommittee hearing.

A report on Caterpillar's tax-avoidance strategies, to be released before the hearing of the Senate's Permanent Subcommittee on Investigations, has been spearheaded by Sen. Carl Levin, the Michigan Democrat who chairs the panel. But Sen. John McCain, the Arizona Republican who is the ranking minority member on the subcommittee, is expected to dissent from at least some of Sen. Levin's criticism.

The two Senators usually work well together, a spokesman for Sen. McCain said Thursday, but "they disagree on this one." He said Sen. McCain doesn't believe Caterpillar's tax practices are as "egregious" as Sen. Levin does. Tax Analysts, a newsletter, earlier reported that Sen. McCain was "distancing himself" from the report.

A spokeswoman for Sen. Levin declined to comment.

Among other things, the report is expected to examine allegations by a former Caterpillar executive that the company improperly shifted income to overseas subsidiaries to slash its tax bill. Caterpillar has denied that charge.

In May 2013, both Sens. Levin and McCain were critical of Apple Inc. when the subcommittee issued a report on that company's tax-reduction strategies. "It is unacceptable that corporations like Apple are able to exploit tax loopholes to avoid paying billions in taxes," Sen. McCain told the subcommittee. He described Apple's tax strategy as a "scheme."

The subcommittee's investigation found no evidence that Apple did anything illegal. Apple told the panel that it paid all taxes due and argued the U.S. tax code needed a "dramatic simplification."

Caterpillar is expected to argue that its tax payments aren't low. A spokeswoman earlier this week said the company's effective tax rate has averaged about 29% in recent years. A report by the U.S. Government Accountability Office, released last year, found that large, profitable U.S. corporations paid an average effective federal tax rate of 12.6% in 2010.

Write to James R. Hagerty at bob.hagerty@wsj.com

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