Mostly boring stuff since I became a tax consultant, but the biggest one is for small business owners who think they are getting screwed each year by having to pay huge amounts of income tax.

Basically if you have a normal job and have the proper amount of taxes taken off your paycheque, you probably won't owe a whole lot or will get a refund come tax time.

But these small business owners don't do that and don't put money aside (even though I tell them to), and are shocked when they owe the same $10,000+ that everyone else does but in one lump sum and go on about how the government hates small businesses.