I also had a thought of keeping cash at home and not keeping any money in the bank, but it is even riskier. Anyone who engages in physical p2p with any vendor is also taking a big risk and i even doubt if any vendor will maintain the normal exchange rate, they will want to buy at very lower rate and sell at higher rate. This tax saga has really made people to start thinking of many ways to bypass and a lot of people have come up with many funny ways they want to use in bypassing it. Some people are even talking of putting a description that the money they are sending is a gift and all that but i think it has already been addressed that the descriptions doesn't matter.
This issue of tax is a very serious one of which something has to be done about it. The way this government silently began enforcing the law is crazy. However, using cash just because of tax evasion is very much risky as many things would happen along the line. If you withdraw more money than you need and you eventually get attacked, you will loose your entire money just because you needed to evade loosing a percentage of the money. Again, cash transactions are very deniable and many people could capitalise on this to reap others of their hard earned money.
If this description pattern is not also working that means we are all doomed this time, haha. We've gone pass the era of moving cash around in bulk, so if anyone wants to go back to the ancient of days due to tax, he should also remember what our forefathers suffered on the road due to the cash they transported by road.