Increased taxation provides a nice incentive to do the kind of work that pays in under-the-table ‘cashy money.’
You mean "supplemental income"? I have found great success in bartering these days. If you have a talent, go trade your goods and services for goods and services of others.
I shovel a drive way all winter for my taxes (usually about 3 times). I change one guys oil and he treats my lawn. I built a loft for another guy and he repaired our computer and added some software for free. I installed a ceiling fan for babysitting. Who is John Galt?