SpeedTax, which markets Internet-based sales-and-use tax systems, has launched SpeedTax Lite, a product that it says is designed for companies that don’t have a complex set of tax needs. VP David Lahey said the company’s initial product “was all about complexity, somebody filing in multiple states.” But he said from the days he ran his own company, he learned the issues were less about problems with calculations and more about preparing quarterly returns and also sorting out nexus issues in a few states.