Mr.Cynic88 said:
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Spend a day sweating and tired, and you can walk away with a pocket full of untaxed cash.
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Tax free cash is o.k, and everyone has done it at some point but I can't stress enough the importance of declaring it to the tax-man
if it's a regular thing(i.e. Not a one off) as I know people that have been caught out with this.
People WILL report/investigate you, even if your smart enough not to tell all your friends/collegues/random people at the pub.
Being smart isn't enough to protect you though, when the tax-man makes inquiries to the company along the lines of
"Why cant you account for this $1000 cash you paid out", they will usually shift the blame onto you. For example, a company I did a side project for paid me in cash on the premise that I would declare my earnings.
O.k, if it's a little here and there you are golden, just be smart about it - the guy giving you cash in hand won't have your back!
OT: Is there something you are good at? For example, I have a friend who dabbles in a little graphic design work on various forums. He doesn't make much but any extra helps right? Plus, he gets the experience to add to a portfolio, which in turn will get him a better job (in theory...)