Originally posted by dirwood or place you in another tax bracket if your already close.
I'm not sure on the intricacies of the US tax system, or the over $600 in private sales as income bit, but I do know a lot of people misunderstand tax brackets. Earning a bit more and putting you into the next tax bracket will never give you less money at the end of the day - now I'm not saying you're thinking this, but the amount of people out there who don't know is astonishing.
Say there's a system where the tax rate is 10% up to $10,000; 15% up to $20,000; and 20% over that.
Now let's say there is an annual income of $30,000 - now some look and say, okay that's in the 20% tax bracket, so 20% tax will be taken off - giving a net income of $24,000 (80% x $30,000). This is not the case.
What happens is the first $10,000 is charged at the 10% rate, the next $10,000 is charged at the 15% rate, and the final $10,000 at the 20% rate. Giving a net income of $25,500 (90% x $10,000 + 85% x $10,000 + 80% x $10,000).
Anyways, in short, if you end up having to pay tax on income from a private sale, and this brings your total income into the next tax bracket, it can suck to pay tax on this extra income but you're not paying more tax on the rest of your income due to the next tax bracket. This is probably the most misunderstood fundamental concept about taxes in Canada and the United States.