To end the Single Business Tax (SBT) after the year 2009, and raise the “cliff,” or amount of annual gross receipts which subjects a business to the tax, from $250,000 to $350,000. (Below the “cliff” a business pays no tax; above it a business pays tax on the entire amount, which is why it is called the “cliff.”) These provisions were added after the legislature voted to adopt a version of House Bill 5883 which will likely cause previously programmed SBT cuts to be postponed. The bill would also authorize two new single business tax (SBT) credits. The first would be for research, development, or manufacturing of alternative energy systems, vehicles, and marine propulsion systems, or for "renewable fuels" including biodiesel or biomass. The second would be a refundable payroll credit for a firm located in a proposed alternative energy renaissance zone.