Tax-advantaged benefits, like flexible spending accounts, can save employees in the United States thousands of dollars annually, and reduce the amount of payroll taxes companies pay. But those benefits are often underutilized, simply because they can be confusing to navigate. Benepass wants to make the process easier with a mobile app that centralizes all of an employee’s tax-advantaged accounts, and is linked to physical and virtual payment cards. The startup announced today that it has raised a $2.4 million seed round. The funding was led by Gradient Ventures, Google’s AI-focused…