Microsoft’s stash of cash stored overseas, not subject to U.S. taxes, is growing. In its latest regulatory filing, the software giant said it has now stockpiled $92.9 billion offshore and that this money could have cost the company $29.6 billion in taxes, but didn’t. That compares to $76.4 billion from the previous year, worth an estimated tax bill of $24.4 billion, according to a report released in May from Washington think tank Citizens for Tax Justice.