Google…says it has…overpaid $83.5m in tax – and it's suing the US Internal Revenue Service to get it back. The dispute dates back to 2004...Its other options exhausted, Google is now taking its case to the US Tax Court…This is certainly not the first time Google has butted heads with the US government over matters of taxation. The online giant periodically comes under scrutiny from the IRS over its elaborate profit-shifting techniques, which are believed to help it avoid paying some $1bn in federal taxes each year. The UK government, too, has criticized Google's tax arrangements, with the Public Accounts Committee describing the company's corporate payments structure as "highly contrived" and demonstrative of "aggressive tax avoidance." For its part, Google denies such characterizations…[also refers to AOL]