
The issue the IRS had with my return from 2010 was that a stock sale was reported to them that I didn't include on my return. The only 1099 I had from the company that handled my company stock for that year showed a much smaller sale (in # of shares and $). But going back to the *previous* year's return and the papers I had saved with that, I can see that I had the larger amount (both shares and $) then. So I must have sold it in either 2009 or 2010, but the company never sent me a 1099 for it, and by the end of the year I'd forgotten it. So it seems clear I do owe the back taxes. :-(
To add insult to injury, they figure the tax on zero cost (meaning that they assume the income from the sale of the stock is all profit), and since I have no 1099 showing how much I gained or lost (and I lost money on the smaller transaction), I can't really contest it (though I suppose I could send them the papers from the previous year, showing the cost value of the stock at that time).
Don't get me wrong; it's not a crippling sum of money I owe by any means (about a fortnight's pay, and I have plenty of savings--I don't live paycheck to paycheck). But I can think of things I'd rather do with the money, and it irritates me that either I was careless and lost the 1099 or the company was careless and didn't send it to me.