You will fill out Schedule D to report the sale of this stock. In Section II of Schedule D, fill out the name of the stock you held, the date acquired and the date sold. The fill out the purchase price, sale price and the gain or loss. In this case it will be a loss of $6,831 on this particular sale. This amount will then be carried down to line 15. The next entry you will make is on line 21 of Schedule D. Here you enter your actual loss or $3,000, whichever is less. $3,000 is the most you can claim in any one year for a loss on Schedule D. This loss amount will then carry over to your Form 1040, line 13, and $3,000 will be deducted from your adjusted gross income and will not be subject to tax.
The balance of what you lost ($3,831) will be saved and carried over for future tax returns. Each year you can continue to take a loss of up to $3,000 until your losses are fully written off. Here is a link to Schedule D for your reference.
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