If the government has shown amazing determination in clamping down on the cash, or black money economy by first demonetising 500 and 1,000 notes, and then systematically plugging all loopholes, it has perhaps not shown equal determination in simplifying taxes. The final GST, or what it is likely to be, is far from the original one-nation-one-tax concept, with at best, a couple of slabs, and no exceptions. The new tax system, in fact, will have four slabs – 5 per cent, 12 per cent, 18 per cent and 28 per cent. Some goods will be exempt from taxes. And finally, a cess on luxury and “sin” goods will be levied over and above the highest tax rate. In other words, it will have a minimum of six different rates at…